Super-bright LEDs, which appeared relatively recently, have already become common light sources. They are built into lamps and strips, sold separately and assembled into modules. The most popular today are smd 2835 diodes. Having good characteristics and relatively low cost, they are widely used in lighting technology itself for various purposes. In this article we will talk about these semiconductor devices, we’ll find out what they are and how they differ from other types of LEDs.
Design and appearance
Externally, the LED looks like a ceramic rectangle measuring 2.8 mm x 3.5 mm (hence the digital marking). On one side of this rectangle there is an LED crystal filled with a protective compound, on the other there are contacts for surface mounting (hence the smd - surface mounted device). These contacts serve to power the crystal and at the same time act as a radiator that removes heat from the semiconductor.
Appearance of smd 2835 LEDTo improve the spectral characteristics and slightly change the color temperature, a special phosphor is added to the compound. If you look closely, you can see a crystal with current-carrying wires through the protective coating.
The LED crystal is clearly visible through the compound Specifications
Today, smd 2835 LEDs are available in three versions:
- 0.2 W;
- 0.5 W;
- 1 W.
All of them are identical in appearance and differ only in the power of the crystal installed in the case. Separate from these three types of LEDs is a Chinese development with a power of 0.09 W. In fact, this is an ordinary fake that has a standard marking, but is equipped with a low-power crystal with a luminous flux of 8 lm.
Such an LED is inexpensive, but the worst thing is that it is very difficult to distinguish it externally from a normal branded LED - the crystal is not always visible through the compound, and it can be impossible to visually determine its dimensions. In the accompanying documentation for the devices, our Chinese friends can indicate anything they want. The only way to avoid falling for a fake is not to buy suspiciously cheap devices.
I summarized the remaining characteristics of the LEDs, including the Chinese version, in a table:
Main characteristics of smd led 2835
Expert opinion
Alexey Bartosh
Ask a question to an expertThe characteristics of Chinese LEDs may differ significantly from those indicated in the table, and, as a rule, for the worse. Everything will depend on the ingenuity of a particular manufacturer and the characteristics of the crystal that urgently needed to be sold under the guise of smd 2835.
Application
Due to their good light output, large dispersion angle, compactness and relatively low cost, SMD 2835 diodes are widely used in lighting technology. They are collected from LED bulbs for general and local lighting, they are built into LED strips, which, in turn, are used both for lighting and decorative purposes.
You can meet smd 2835 in flashlights and tactical flashlights. Low-voltage lamps assembled on their basis are successfully used by motorists, installing them in headlights and headlights instead of incandescent light bulbs.
These devices are very popular among electronics engineers and designers, since smd 2835 can be purchased separately or assembled into modules various forms, size and power.
smd diodes this series can be purchased separately or built into ready-made lighting fixtures LED strip on led 2835
LED strips (SL) are widely used for both lighting and decorative purposes. Therefore, this product, assembled on SMD 2835 LEDs, is worth talking about separately, as the most popular and affordable.
The smd 2835 LED strip is usually assembled from a 0.2 W smd LED, since cooling more powerful strip devices with relatively thin conductive paths is very problematic. The number of SMD semiconductors per 1 m of SL can be different - 60 or 120. The supply voltage is 12, 24 or 220 V, and its value depends on the design and the presence of a power supply, and not on the number of LEDs per meter. For a product with an LED density of 60 pcs/m, the specific power and luminous efficiency will naturally be 2 times lower.
Important. LED strip based on SMD LEDs of this type has a relatively high power, and therefore it only needs to be mounted on a metal (usually aluminum) profile, which will serve as a radiator.
By design, the LED strip differs in:
- hermetic;
- dust and waterproof;
- weakly protected;
- without protection.
When choosing a device, be sure to consider the conditions in which it will have to work. Buy tape only with the appropriate degree of protection against environment.
Now for power and light output. Knowing the power of one LED, it is easy to calculate the specific power of the SL itself. For a product with 60 diodes per 1 m, the power density will be 0.2*60=15 W/m. For a 120-diode strip, respectively, 30 W/m.
Expert opinion
Alexey Bartosh
Specialist in repair and maintenance of electrical equipment and industrial electronics.
Ask a question to an expertThe actual power density of the LED strip is somewhat lower, since the manufacturer slightly underestimates the current through the semiconductors. This increases the reliability of the line without significantly deteriorating its other characteristics.
Naturally, these calculations are valid only for branded products made from real LEDs, and not from fakes. But the catch here is that 90% of tapes on the world market are made based on Chinese smd 2835! Moreover, sellers often position them as “premium”, misleading the buyer. How can you determine whether it is a real “premium” product or if they are trying to sell you a low-power fake?
How to find out the power of the LEDs used in the strip
First of all, the price. The cost of a low-power tape is several times different from the price of a real product. Next, power density. Anyone who is familiar with arithmetic can easily calculate which LEDs are installed in the strip. To do this, just look at the accompanying documentation and press the 4 buttons of the calculator.
To experiment, go to the Internet and look at the product. I went to a seemingly decent site and chose two bands: “premium” and “economy”. The first is exactly 6 times more expensive than the second:
- LED strip smd 2835 120 СW Premium.
- LED strip smd 2835 120 CW Economy.
smd 2835 120 CW Premium (left) and smd 2835 120 CW Economy Characteristics of the first:
- LEDs per 1 m – 120;
- specific power – 8.4 W/m;
- specific luminous flux – 635 lm/m;
- supply voltage - 12 V.
Characteristics of the second:
- LEDs per 1 m – 120;
- specific power – 9.6 W/m;
- specific luminous flux – 360 lm/m;
- supply voltage - 12 V.
Let's see what kind of premium this is. We calculate the power of 1 LED: 8.4/120=0.07 W. Luminous flux of one LED: 635/120=5.3 lm. We have arrived... This “premium” is assembled using Chinese LEDs with a power of 0.09 W and a luminous flux of 8 lm. Moreover, in order for this miracle to work longer, the designers provided the diodes with a light mode. They greatly reduced the power consumption of current-limiting resistors, which caused a decrease in luminous flux by one and a half times.
What then did they insert into the economy feed? We count. LED power: 9.6/120= 0.08 W. We will not calculate the luminous flux: it is obvious that it is 2 times lower than that of the previous model. What kind of crystal did the resourceful developers plug into the smd 2835 LED housing? Only the manufacturer himself knows about this. One can only assume that the craftsmen built a crystal from smd 3528, or even something worse, into the smd 2835 case. Or maybe, for the sake of attractiveness, they simply overestimated the power density, but forgot to recalculate the luminous flux, who knows.
Expert opinion
Alexey Bartosh
Specialist in repair and maintenance of electrical equipment and industrial electronics.
Ask a question to an expertDespite the low light characteristics, inexpensive strips are quite suitable for decorative lighting. The only thing is that the likelihood that the product will work out its intended service life is much lower than that of a branded one.
As I said above, low-quality fakes are often accompanied by documentation in which the characteristics can be significantly overestimated. Therefore, the calculation method based on the stated characteristics may not work. Here all that remains is to focus only on cost and visual brightness.
There is another option: measure the resistance of the current-limiting resistor, calculate the current through it, and use the current to judge the power of the LEDs included in its circuit (usually there are 3, less often 5). But this method requires special knowledge, and therefore I will not consider it here.
How to distinguish SMD 2835 from 3528
There is another type of LED that is often confused with 2835 - this is smd 3528. Not only are the numbers misleading, but both models have the same dimensions. Nevertheless, these are completely different devices, and the 3528 LEDs have much more modest characteristics:
- Power – 0.06 W.
- Luminous flux - 6 lm.
- The radiation angle is 100 degrees.
Thus, if you confuse these devices, then you will end up with, for example, a strip or lamp with a specific power of 3.6 W/m instead of the expected 14.4 and with a luminous flux of 360 lm/m instead of 1200.
How to distinguish one type of LED from another? This is not difficult to do, since the design features of each of them are visible even to the naked eye:
Appearance of smd 3528 and smd 2835 LEDs Firstly, the crystal in the smd 2835 is covered with a compound over the entire area of the case, while in the 3528 model the coating occupies only a small round area. By the way, it is precisely because of such a small spot that the dispersion angle of the latter is narrowed to 100 degrees.
LED strip is one of the types of LED lamps, made in the form of a flexible plastic base with an adhesive layer on back side and LEDs located on it. It is used for decorative interior lighting, and also as an alternative to the main lighting source. Supplied in plastic spools.
The length of the reel is 5 meters. The tape is a single copper board on which resistors and LEDs are located. These five meters consist of individual segments of 5 cm each. 
For example, an SMD3528 tape has 1 resistor and 3 LEDs on such a segment. The SMD5050 strip has its own resistor for each LED. Along the edges of the segment there are cut lines and places for soldering. Thus, if necessary, the tape can be shortened only by a length that is a multiple of the segment length. 
The copper base of the LED strip is actually the same wires, only in a flat design. Their cross-section is designed for a current capable of powering an area of no more than 5 m. Extending the tape yourself can lead to its failure.
Types of LED strips
LED strips come in several types:
You can distinguish one-color from RGB by the number of soldered wires. There are only two of them on monochrome, and four on color. 
At the same time, to connect a single-color strip, you only need a power supply, and for an RGB strip, a controller is also required. 
They are also divided by the size of the LEDs and the method of their application. The most common are:
- SMD3528
- SMD5050
Less popular:
- SMD2835
- SMD5630 (5730)
What is SMD and how does it stand for? SMD from English Surface Mounted Device - surface mount device. That is, the LED is soldered to the substrate on top. 
The numbers after SMD indicate the size of the LED in millimeters - its length and width.
SMD 3528 tape
This type has small LEDs 3.5mm * 2.8mm. The brightness of such a diode is only 4-6 lumens. Tape width 8mm. This type is used exclusively for decorative lighting. 
It does not blind your eyes and, due to its low power, allows you to save on the purchase of powerful power supplies. 
SMD3528 is available in monochrome colors and is not able to change its color during operation.
SMD 5050 tape
SMD5050 has LEDs measuring 5mm by 5mm. Such LEDs can already replace the main lighting, since the power of just one element here is 11-25 lumens.
This will give a luminous flux equal to a 60 watt incandescent light bulb. Actually, the consumption of SMD5050 is only 15 W. Tape width - 10mm. 
It is about 3 times brighter than SMD3528. One of its main advantages is the ability to change colors under the control of an RGB controller.
SMD 2835 tape
SMD2835 produces about 50 lumens per chip. It has a high price. Width - 8mm. 
High light output also has a reverse negative side- surface heating. It is prohibited to use such tape without good heat dissipation. 
Use an aluminum profile as it, preferably with matte screen. It will diffuse the light, smoothing out the glare effect. 
LEDs 2835 and 3528 are very similar to each other, how can you quickly distinguish them? The cheap 3528 chip has a large height, while the expensive and bright SMD 2835 has a low profile for better cooling and heat dissipation. 
SMD tape 5630 (5730)
The most powerful chip is 5630 (5730). It has a light output of 60 lumens. 
It is even more demanding when it comes to cooling. Mainly used for lighting expensive interiors and in the windows of not cheap shops and boutiques.
Comparison of technical characteristics of LED strips SMD3528, 5050, 5630, 5730 summarized in one table: 
Number of LEDs
One of the differences between LED strips is the number of LEDs. When they tell you in a store SMD 5050 for 60 diodes, this means that there are 60 diodes in 1 meter of tape. There are products with 30-60-72-90-120-180-240 diodes.
Power and brightness of the tape
Everything is simple here, the more LEDs mounted on the strip and the larger they are, the greater its power. The lowest power is SMD 3528 with 60 diodes. Its power is only 4.8W. 
The brightness of an LED strip is proportional to its power. The more powerful it is, the brighter it will shine. Just don’t confuse the dependence on quantity here, and always pay attention to the size of the LEDs themselves.
A strip with 30 elements can shine much brighter than one with 60.
Degree of protection
The degree of tape protection is indicated by two with Latin letters- "IP" and two numbers after them.
- tapes without protection - IP20
It is not protected from moisture, splashes and is very poorly protected from mechanical influences. Soldering points, contacts, etc. are exposed. Some manufacturers specify IP33 in their documents, but this can also be attributed to products without protection. 
If moisture gets on such a tape, a short circuit may occur and it will burn out.
- tapes with IP65 or IP54 protection
A protective compound is applied to it on the upper side. Among experts they call it silicone tape. In fact, it is not silicone, but an epoxy coating. 
This LED strip is afraid of frost, because its protection at subzero temperatures simply hardens and becomes hard and brittle.
- tapes with IP67 protection
This is already a completely sealed product. This tape can even be installed outdoors. It is placed in a silicone case and is not afraid of moisture and rain.
This tape is placed in a U-shaped silicone profile and filled with epoxy compound on top. It can even withstand being placed in water. Often used for lighting in fountains or in the bathroom. 
Having familiarized yourself with all the characteristics, the next time you go to the store, when you ask the seller: “What kind of LED strip do you need?” you must answer boldly and knowledgeably:
“I need an SMD 5050 LED strip with 60 diodes, with a degree of protection of IP65 and so that its luminous flux is at least 1200 lumens.”
Explanation of names
What do the abbreviations and abbreviations of numbers and letters mean in the full names of LED strip brands:
Differences between cheap and expensive LED strips
The most “blurred” characteristic, but the most important for you, is the quality class of the tape. Why are the same instances with the same amount LEDs, power, and the same level of moisture protection cost completely different money?
How to distinguish a good tape from a poor one and what is the difference? To understand this, you need to know what the LED strip consists of. 
Its three main components:
- substrate or flexible printed circuit board
- the LEDs themselves
- resistors
Substrate
Despite the similarity, standard-class tapes and premium tapes differ in everything, starting with the backing. In the premium version, it contains much more copper. This tape is simply thicker. 
The article will talk about SMD 2835 LEDs, how they differ from others and what advantages they have, as well as their areas of application.
Application
SMD LEDs in form factor 2835 are widely used in LED strips, light bulbs and lamps due to their miniature size and efficiency. SMD 2835 LEDs are used in both lighting and decorative lighting. This is an excellent replacement for “glowing” signs on neon tubes and halogen spotlights for illumination architectural structures. Strips based on such LEDs serve as a bright and reliable solution for use outdoors and indoors. landscape design.
The LED can be used both as a strip and in discrete form or mounted in a complex on printed circuit boards, and is also combined with a power source enclosed in a sealed housing, which allows the use of such structures even under water, for lighting ponds or aquariums.
Characteristics
The main characteristics of SMD 2835 are shown in the photo below in table form. It shows that the index 2835 means dimensions of 2.8 mm by 3.5 mm.
The power in comparison with “competitors” is significantly higher, which is also evident from the characteristics table.
The emission angle of LED SMD 2835 is good - 120 degrees, it provides good light dispersion, because in the extreme zone the brightness level reaches 50% or more.
Only high-quality LEDs from well-known manufacturers Philips, Osram and the like can ensure compliance with the specified parameters. Chinese products are often completely far from the declared power, luminous flux, and color characteristics!
The produced SMD 2835 LEDs have different powers: 0.2, 0.5, 1 W. It is worth noting that the higher the power, the more heat it emits. Without cooling, this will lead to overheating of the LED crystal and its rapid degradation (decrease in brightness) or complete failure.
There is also the factor that the rated current is the operating current at temperatures of the order of 30 o C; as the temperature rises, the current must decrease, otherwise an avalanche-like process of increasing current and temperature is inevitable, which will ultimately lead to failure of the light-emitting diode.
To avoid such incidents, it is necessary to provide the LED with effective heat removal by introducing a cooling system -.
It is recommended to use an aluminum radiator with an area of 20-40 square meters per 1 W of LED power. cm. When making calculations, you should take into account the ambient temperature; the higher the operating temperature, the larger the radiator area. Gentle operating mode - below the rated current, will also extend the life of the SMD 2835 LED.
The color rendering coefficient of LED SMD 2835 must be at least 75%. This value is responsible for the correct perception of colors by a person, illuminated objects, by a given LED.
Differences and comparison of LED SMD 3528, 2835, 5050
The 2835 LED was released later than the 3528 and 5050, so it has better technical characteristics and is capable of more accordingly.
The difference between LED 2835 and 3528 is the size of the crystal, it is larger, as is its luminous flux, rated power and luminous efficiency Lm/watt. The new LEDs have larger contact pads, which provides better heat dissipation. High-quality products use body materials with greater thermal conductivity. The height of the 2835 case has been reduced. All this made it possible to improve heat removal from the LED crystal, and accordingly increase the service life.
Light-emitting diodes of the SMD type give off heat primarily through the contact pads.
The SMD 2835 LED has almost the entire emitting surface covered with a layer of phosphor, while the SMD 3528 has only a circular area in the center, this made it possible to significantly increase the light emission area.
The difference between LED 2835 and 5050. An SMD type LED is 3 SMD 3528 crystals in one housing, on the bottom of which there are 6 pins. Therefore he has larger size s, and its crystals can be included in the circuit separately. This factor makes it possible to obtain RGB LEDs or an elementary brightness control circuit by removing one branch of crystals from operation, without losing the uniformity of the product’s glow. With the same power, the 2835 can be noted higher value luminous flux. Otherwise, the differences are the same as from 3528.
To better understand how light-emitting diodes differ from each other, look at the photo, and everything will immediately become clear. The photo shows the characteristics in comparison.
To consolidate the information received and better understand, we recommend watching a video, the author of which conducts a comparative assessment of the LEDs discussed above.
Varieties
How is it known to produce LEDs? white- This is a difficult technology. One of the options is to use a blue crystal, followed by coating it with a phosphor, which actually gives the required shade of white. Depending on your needs, you can buy light-emitting diodes with a warm, neutral or cold glow. Different color temperatures provide choice and allow you to achieve the desired result.
There are SMD 2835 colored LEDs on sale: red, blue, green and others.
Flaws
They have no shortcomings as such. The only thing is that you won’t find multi-color LED SMD 2835 RGB on sale, only single-color ones.
Results
SMD 2835 LEDs are characterized by their small dimensions, good heat dissipation and high luminous flux. Thanks to the enlarged luminous surface, a wider angle of light emission is obtained. Today, SMD 2835 are the most advanced in almost all respects, and have replaced the classic 5050 and 3528. When choosing, you should first of all pay attention to this type.
Technical characteristics of SMD 2835 LEDs: optical, electrical parameters, standard size. Connection diagram for SMD LEDs 2835. Comparison of SMD LEDs 2835, 3528, 5050.
In terms of electrical and optical parameters, SMD 2835 has much in common with the SMD 5730 LED with a power of 0.5 W. Considering that the emission area of SMD 2835 is 1.7 times smaller, it has the same luminous efficiency as SMD 5730, which means it is better suited for the design of highly efficient LED lamps.
The form factor is in many ways reminiscent of another progressive LED, SMD 3014. The emitting surface is rectangular in shape and completely covered with phosphor. The body is made of a heat-resistant white compound with a small cut in one corner indicating the cathode.
Unlike SMD 5630 and SMD 5730, the function of the heat-removing substrate is performed by the anode and cathode. Now their conclusions are located not only at the ends, but also on the bottom of the case. This design feature cannot be ignored when assembling an LED lamp with your own hands.
The LED chip is suitable for designing a wide range of luminaires: strips, spotlights, lamps, street lights.
SMD 2835 has deservedly replaced the less bright models with the index 3528 and 5050. The exception is the RGB SMD 5050, for which there is currently no alternative in one case.
It is worth noting that the SMD 2835 LED can be freely purchased as standard color scheme, and in additional (purple, turquoise, orange). You can clearly experience the full depth of color and brightness using the color LED strip on these chips.
Technical characteristics of SMD 2835.
SMD 2835 LEDs are powerful semiconductor light sources with forward voltage from 2.8V to 7.2V and forward current up to 30mA.
The luminous flux, depending on the rating, varies from 20lm to 63lm. The light-emitting crystal materials used are Indium (In), Gallium (Ga) and Nitrogen (N).
The use of alloying additives and various production technologies make it possible to obtain different shades of white light: pure white, daylight and warm white.
The housing of SMD 2835 LEDs is made of heat-resistant plastic, the lens is made of transparent epoxy resin.
A distinctive feature of the presented LEDs is a large contact pad (heat-dissipating substrate), which provides additional heat removal accumulated during the glow process.
Size 2835 indicates dimensions LED – 2.8×3.5 mm.
LEDs are mounted on the surface using SMD technology (Surface Mounted Device) using group soldering or using thermal air soldering station. It is recommended to carry out the reflow process in a nitrogen atmosphere while observing the time-temperature conditions for soldering.
The cathode lead of the 2835 chip LEDs is visually identified by a small corner cut of the housing and a shorter lead. When connecting power, pay attention to the polarity of the LEDs.
It is also prohibited to connect LEDs directly to a power source. Power drivers or resistors must be used as a limiting current stabilizer. In this case, a separate resistor is connected to each chain of series-connected LEDs.
Increased working temperature environment is no more than +85°C, reduced operating temperature is not lower than -40°C. Power losses do not exceed 200 mW. The beam angle is wide – 120°. Service life of at least 10,000 hours.
As an example, consider the characteristics of SMD 2835 white emission with a color temperature of 5500°K.
Depending on the composition of the phosphor, white SMD 2835 is available in warm, neutral and cool white light with a color rendering coefficient of at least 75%.
The maximum permissible forward current is 180 mA, pulse current is 400 mA with a pulse width of up to 10% of the period. In this case, the forward voltage spread can be 2.9-3.3V.
The emitted light flux reaches 50 lm with a dispersion angle of 120°. Operating at rated current, white SMD 2835 dissipates about 0.5 W of power and requires additional cooling, while the LED operating temperature range is from -40 to +65 °C.
All given characteristics imply the use of LEDs with index 2835 at an ambient temperature of Ta=25°C. However, in reality the chip operates in much less comfortable conditions. The heat removal is hampered by a protective silicone layer or lamp diffuser, and the temperature in the room is sometimes higher than 25°C.
The first graph shows that a rated current of 180 mA can be supplied to the LED only at Ta=0...30°C. As the temperature rises, the operating current must be reduced so as not to overheat the crystal. Already at 80 degrees, the current should be limited to 50 mA, which is what little-known Chinese manufacturers of LED products do. Without caring about effective cooling, they deliberately lower the operating current.
In reality, you can count on a light output equal to 80–90% of the rated value. The luminous flux is influenced even more strongly by the magnitude of the forward current; 100% light output is possible only at 180 mA, and this requires ideal heat dissipation.
If we consider, for example, low-quality Chinese LED lamps, where the actual current on one chip is about 50 mA, then the relative luminous flux will be no more than 25% of the nominal value. In addition, the light output gradually decreases during operation of the LEDs and after 3000 hours it will be about 95% of the initial state. This is clearly shown in the following graph. Reduced light output and operating current are not at all an indicator of counterfeit; these parameters characterize real conditions operation of an LED in an SMD 2835 chip.
Connection diagram for SMD LEDs 2835.
To ensure maximum longevity of SMD 2835 LEDs, it is recommended to connect them in series to the resistance ratings. It is worth remembering that the most reliable circuit will be if a separate resistance (resistor) is allocated for each chain of series-connected LEDs.
When installing LEDs you need to use current limiting resistor to reduce the current passing through the LED, otherwise it will fail very quickly. To select a resistor, you can use an online calculator.
If you need to connect several LEDs at once, then they are installed sequentially. It is worth keeping in mind that all LEDs in the circuit must be of the same type, and the power source must have sufficient power and provide a voltage exceeding the total voltage of all LEDs.
If you need to assemble a circuit with several parallel circuits of series-connected diodes, the calculated resistor value must be set for each of the circuits. You cannot connect several LEDs in parallel using one resistor, since LEDs have varying parameters and require different forward voltages, which makes such a connection practically unworkable.
Comparison of SMD LEDs 2835, 3528, 5050.
SMD 2835 was released later than 3528 and 5050, so it has better technical characteristics and is capable of more accordingly.
The difference between LED 2835 and 3528 is the size of the crystal, it is larger, as is its luminous flux, rated power and luminous efficiency Lm/watt. The new LEDs have larger contact pads, which provides better heat dissipation.
High-quality products use body materials with greater thermal conductivity. The height of the 2835 case has been reduced. All this made it possible to improve heat removal from the LED crystal, and accordingly increase the service life.
Light-emitting diodes of the SMD type give off heat primarily through the contact pads. The SMD 2835 LED has almost the entire emitting surface covered with a layer of phosphor, while the SMD 3528 has only a circular area in the center, this made it possible to significantly increase the light emission area.
The difference between LED 2835 and 5050. An SMD 5050 LED is 3 SMD 3528 crystals in one housing, on the bottom of which there are 6 pins. Therefore, it is larger in size, and its crystals can be included in the circuit separately. This factor makes it possible to obtain RGB LEDs or an elementary brightness control circuit by removing one branch of crystals from operation, without losing the uniformity of the product’s glow. With the same power, the 2835 has a higher luminous flux. Otherwise, the differences are the same as from 3528.
The video shows the process of soldering SMD 2835 LEDs.
LEDs of the SMD series measuring 2.8 mm by 3.5 mm are characterized by the same luminous efficiency as models with similar external properties, for example, 5730. At the same time, they are more compact and less energy-consuming, which means they are more efficient for assembling LED lamps for various purposes.
Let's consider what design features, appearance, the characteristics of LEDs 2835 smd led, as well as their parameters, scope of application, features and main differences from the analogue with dimensions 3528.
The 2835 SMD diode is made from polymer materials. Outwardly it resembles 3528, but differs significantly from it in characteristics. Main feature Its design is polymer based. It can withstand temperatures of more than two hundred degrees. In this case, the role of a heat sink is performed by the cathode-anode system. From the decoding of the abbreviation name (smd) it follows that such a solid-state light source is intended for surface installation.
Other design parameters of 2835 LED luminaires include:
- The body is made of thermoplastic material, and the lens is made of a light-transmitting epoxy base.
- An extensive panel for removing the heat generated during the glow.
- Connecting LEDs is only permissible through resistors or feed drivers that act as a stabilizer.
- When connecting contacts, polarity must be taken into account. The cathode conductor has a small cut and shorter length.
- The light-emitting crystal is made from nitrogen, galium and indium.
Advice! When connecting 2835 smd led at the same time, you must use a serial circuit. In this case, all LEDs must have the same parameters. The power supply must have sufficient power and voltage, slightly greater than the total value for all ice lamps.
Specifications
LED 2835 LEDs have the following set of technical characteristics:
Varieties of 2835 smd led are determined by different combinations of the following characteristics:
- Voltage drop – from 3.1 V to 9.8 V.
- The luminous flux power is from 20 to 145 per diode.
- Current parameters are from 60 to 300 mA.
Here is another table of technical characteristics of 2835 smd led
The higher the power of the LED element, the higher its temperature. Likewise, the higher the operating heating parameters, the lower the rated current should be. As a result of overheating, the LED crystal is destroyed, which ultimately leads to a decrease in its brightness.
To eliminate Negative consequences in this case, it is necessary to select an effective radiator. So, for every watt of power there should be from 20 to 40 square centimeters of an aluminum alloy cooler.
Scope of application
SMD 2835 light elements are used as a light source both in single LED lamps and in LED strips. Minimum dimensions, reliability, long term service and high light density allow them to be used as decorative lighting. This includes advertising signs, lighting of architectural objects and decorative elements in the room, decoration in auto tuning and landscape design, and display of underwater objects in artificial reservoirs, aquariums, swimming pools (when enclosed in a sealed housing).
Features of LED strips based on LED 2835
LED strip based on SDM diodes measuring 2.8 by 3.5 mm is characterized by a number of advantages:
- LEDs of type smd 2835 are similar in appearance to the analogue 3528, but at the same time they have the best parameters. They have more flat shape. Height is only 0.8 mm. This makes it possible to expand the scope of their application.
- Less heating of LED elements due to better pressing of them to the base.
- A high-quality two-layer board 1 centimeter wide ensures high electrical conductivity of the tape and heat dissipation.
- Good performance characteristics.
- LEDs of various colors are common on sale - red, blue, green, etc.
- Based on the glow temperature, LED elements can be warm, cold or neutral.
Among the disadvantages of tapes based on 2835 smd led, the following features stand out:
- Installation is only permissible on a base that dissipates heat well.
- Connection and switching on is possible only through a circuit that contains a power supply.
- Crystals can only glow with one given light, there are no multi-color 2835 ones.
The density of the LED elements of the strips differs by two popular types– 60 and 120 units per meter. The minimum line segment is 5 cm. It contains only three LEDs of the 2835 smd modification. An LED strip with 120 elements can actually be used as a full-fledged alternative to chandeliers, shades and other household lamps. In this case, the light will be bright enough and without annoying effects - flickering and unevenness.
Recommendation! Not all manufacturers supply quality products to the market. To reduce costs, they often resort to such tricks as, for example, inserting a 3528 chip into the base of the strips. In addition, low-quality LED lamps based on 2835 SMD can be identified by such parameters as - low price, very thin contact wires, width boards that do not reach the standard value (1 cm), and most often equal to about 0.7-0.8 cm. The value of the luminous flux does not exceed a record low of 7-9 lm, instead of the standard 50 lm.
How to distinguish LEDs of type SMD 2835 from 3528
2835 smd led was developed and put into production much later than the 3528 series. Thanks to this, it has better technical and operational parameters. For example, the 2835 has a larger die size. This significantly increases the luminous flux, power, and luminous efficiency. In addition, the new diode stands on a wider heat-dissipating base, which means it heats up less and does not lose its original qualities after a long service life.
