The SMD 2835 LED is one of the best developments by scientists in the field of solid-state light sources intended for surface mounting. It differs from its predecessors in its high performance characteristics and simpler installation method.
Peculiarities
Today, SMD 2835 can be positioned as a planar LED, in the housing of which the best qualities taken from previous modifications are hidden:
- The width and length of the LED completely coincides with the size of SMD 3528. This simplifies the task of LED strip manufacturers in setting up production equipment. At the same time, the height of the element is reduced to 0.8 mm, which reduces the cost of its production and expands the scope of its use.
- In terms of electrical and optical parameters, the SMD LED 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.
Brief Description and Application
The LED chip is suitable for designing a wide range of lamps: strip lamps, spotlights, street lights. The SMD 2835 LED has deservedly replaced the less bright models with the index 3528 and 5050. The exception is the RGB SMD 5050, which currently has no alternative in one package. It is worth noting that LED SMD 2835 can be freely purchased both in standard colors and in additional ones (purple, turquoise, orange). You can clearly experience the full depth of color and brightness using the color LED strip on these chips.
Specifications
Let's consider the electrical and optical parameters using the example of a white SMD 2835 LED 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, led white SMD 2835 dissipates about 0.5 W of power and requires additional cooling. 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. Heat removal is hampered by a protective silicone layer, a lamp diffuser, and the temperature in the room is sometimes higher than 25°C. How critical this is can be seen in the graphs below. 
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.
The second graph proves the dependence of the luminous flux on the ambient temperature with 100% efficiency at the point Ta=25°C. In reality, you can count on a light output equal to 80–90% of the rated value.
The magnitude of the forward current affects the luminous flux even more strongly. The graph shows that 100% light output is possible only at 180 mA. And for this you need 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 a fake; these parameters characterize the real operating conditions of the LED in the SMD 2835 chip.
Read also
LED lighting is now used almost everywhere. Today, products have a wide selection on the product market. The most common model of LED lighting is LED strip 2835.
Description
This is a model with a rubberized base, on which diodes are applied in a row. LED lighting was one of the first to hit the consumer market. SMD LED 2835 has a luminous flux of 50 lm and a power of 0.2 watts. The characteristics are above average, but the products have confidently established themselves in the market position.
It is equipped with a diode having one crystal. The elements of this circuit were used long before the invention of LED lighting. They are widely used in household appliances. Also, a single-chip diode is used to produce budget lamps.
Today, LED strips are produced by almost all countries, but China is the leader. When purchasing this tape, it is worth remembering that the characteristics are reduced by 30%. The low price of diode strip itself indicates that the quality leaves much to be desired. When purchasing, it is better to purchase a quality product than to constantly buy new ones.
Specifications
These LEDs are mounted only on top of the material or profile and are used in various types of lighting fixtures. The SMD 2835 model is very outdated, but is used with great success as a backlight. SMD 2835 still competes in the market due to its quality, as it is vibration-resistant, moisture-resistant and has very good characteristics.
Features of LED strip
SMD 2835 can be confused with other tapes in appearance, since they are very similar, but in terms of characteristics it is much better than its analogues.
To reduce heating during model production, the diodes are pressed to the base. A flexible printed circuit board is used. A two-layer board with a width of no more than 10 mm is used to improve current conductivity and successful heat dissipation. Very often, to reduce the cost, diodes are clamped tightly and internal chips from weaker diodes are installed. To distinguish a quality tape from a fake, you should pay attention to the following:
- Price. The lower it is, the lower the quality.
- Wire cross-section. They shouldn't be too thin.
- The board must be at least 10 mm.
Low quality products never have 50 lm, at best 10 lm. The power consumption will be even greater than that of high-quality products. Each tape must have its own power supply to ensure stable operation. A good quality SMD 2835 LED strip has a power per meter of at least 9 watts, and 18 watts with a dense arrangement of up to 120 diodes.
LED strip has the following advantages:
- high practicality;
- economy;
- easy installation;
- maximum light output.
While there are advantages, there are also disadvantages:
- the tape should be installed only on a metal profile;
- mandatory connection to the power supply.
This model has taken a confident position in the market and has proven itself well.
Application
These LEDs are used everywhere:
- lighting of private areas and apartments;
- illumination of advertising boards;
- used for car tuning.
Very often the model is used for surface mounting. It has been widely used for many years to this day.
The following features can be noted:
- minimal degradation of light flux;
- heat-resistant housing that can withstand up to 250 degrees;
- small sizes;
- low crystal resistance.
There are many color shades of LED strip, but the brightest luminous flux is white, and the least flux is neutral white. With constant use of the tape, the product overheats. To avoid breakage, the tape should be attached to the aluminum profile.
SMD 2835 is an excellent lighting device with excellent characteristics and quality from the manufacturer. It has also taken a strong position in the sales market and continues to remain competitive.
SMD 2835 and 3528 have different characteristics, although they seem, if not the same, then very similar chips. In fact, they are two completely different types of LEDs.
Surface Mounted Device (abbreviated as SMD) is translated from English as “surface mount device”, the size of which is indicated by the adjacent number. SMD 2835 has a width of 2.8 mm and a length of 3.5 mm. SMD 3528 has 3.5 and 2.8 mm, respectively.
Although manufacturers usually call SMD 3528 a classic LED, almost all modern consumers consider it outdated and ineffective. But the price of finished products based on SMD 3528 is pleasing. Lamps, strips, and lamps based on such an LED are usually used for spot lighting.
The efficiency indicators of SMD 2835 are many times higher than its predecessor. The model is considered much more technologically advanced. Devices equipped with SMD 2835 successfully complement home and office interiors. They are used in large open spaces (for example, to illuminate landscape installations, building facades, or even entire streets) and are a worthy competitor to neon signs and halogen lamps, which are gradually becoming a thing of the past due to their inefficiency.
The convenient form factor allows the SMD 2835 diode to be combined with power supplies in sealed housings, due to which some designs can operate in water. This will be especially appreciated by those who are looking for an option for decorating a pond, aquarium, or swimming pool.
Sometimes SMD 2835 LEDs are produced in discrete form or built into printed circuit boards. As can be seen from the examples, the scope of application of SMD 2835 is much wider than that of SMD 3528. The picture shows how the LEDs 2835, 3528, 5050 and 5630 differ.
Characteristics
You will find the main indicators of SMD 2835 and SMD 3528 in the table below.
The difference is noticeable even to the naked eye.
Manufacturers managed to increase the luminous flux, rated power and lumen output per 1 W of the SMD 2835 in several ways:
- the size of the crystal and the emitting area has increased;.
- the body of the product has been improved (a material with greater thermal conductivity is used as a basis) and its height has decreased;
- Almost the entire emitting surface began to be covered with a layer of phosphor;
- The combination of actions also made it possible to extend the service life of the LED. .
High-quality light dispersion of SMD 2835 was achieved thanks to an emission angle of 120º.
Brightness level in the outer zone - 50% or more
Types of LEDs
How to distinguish SMD 2835 from SMD 3528? LEDs are usually divided according to different factors:
- shades of color temperature - warm, neutral, cold;
- color range.
Diodes can be one-, two- and multi-color. For the latter, an RGB assembly is used. The price directly depends on the color of the SMD diode. Single-color ones are considered the most inexpensive, followed by two-color ones. Among this trio, multi-color ones come out on top in terms of cost, as they require significant financial investments at the manufacturing stage:
- power;
- brightness;
- method of installing an SMD diode.
People make choices in favor of certain models based on personal preferences or specific needs.
If we are talking about buying an LED strip, you can compare products by the number of diodes per 1 m. Usually there are 60 or 120 of them.
Results
The article provides the most relevant information for a buyer who is planning to purchase a lighting fixture, but does not know which model is better. 3528 or 2835 - there really is a difference. From the text and tables it is clear that both LEDs have strengths and weaknesses.
If you need a budget option for decorative lighting, SMD 3528 is ideal. The diode will do the job perfectly and won’t break the bank.
If you are looking for more powerful and efficient lighting equipment, you should take a closer look at the SMD 2835 - a diode that is considered one of the most technologically advanced on the market. The indicators are several times higher than those demonstrated by previous versions. This means that the equipment promises to serve you well and for a long time, and most importantly, to provide uniform, bright light without obsessive flickering.
Still have questions? You can always contact consultants and get competent answers, and at the same time place a retail/wholesale order of LED products.
The number of names of LEDs has already become quite large, many are beginning to confuse them. The most popular are SMD 5050, 5630, 5730, 3030, 3528, SMD 4014, 3014. The numbers in the LED model designation indicate only the housing size. The filling can be absolutely anything, this is what the Chinese use.
They put much weaker crystals in standard SMD 2835 LED housings, 2-5 times weaker. This misleads the buyer, he thinks there are many LEDs, the light is better. LED corn lamps and car lamps are good examples. They are simply dotted with these diodes on all sides. Apart from the weak crystal, the Chinese save on everything else. The diode uses copper conductors instead of gold ones, and the heat sink is made of aluminum rather than copper.
Outwardly, a bad person will be no different from a good one. But it will tolerate heat less well, and will not be able to withstand current surges; the conductor will burn out.
- 1. Characteristics of SMD 2835
- 2. Examples of deception from the Chinese
- 3. LED strip 2835
- 4. Datasheet SMD 2835
Characteristics of SMD 2835
The SMD 3528 0.06W LED has a similar-sized housing. The technical characteristics of SMD 2835 are completely different, usually 0.2W power.
The Chinese love to sell their junk under the guise of new products like “new for 2016, new 4014 LED chips, powerful, super bright.” At first they sold lamps and lamps for cars using low-quality SMD 5630 at 0.09W. When this became boring, they began to put this weak crystal in a new SMD 4014 package. And they advertise it as a new product, which is 5 times better than the previous junk, although there are no differences in quality.
Manufacturers put crystals of various powers in the 2835 case, 0.2W 0.5W 1W. It's hard to tell by appearance. If the color temperature of the light is neutral white, then there is little yellow phosphor and the size of the crystal is visible. The larger it is, the higher the power.
LED 2835 characteristics
| Parameter | Chinese 2835 | 2835 0.2W | 2835 0.5W | 2835 1W |
| Luminous flux, lm | 8 | 20 | 50 | 100 |
| Power | 0.09 W | 0.2 W | 0.5 W | 1 watt |
| Temperature | +60 | +80 | +80 | +110 |
| Current, ampere | 25 mA | 60 mA | 150 mA | 300 mA |
| Voltage, Volt | 3,2 | 3,2 | 3,2 | 3,2 |
| Dimensions, mm | 2.8mm by 3.5mm | |||
There are many varieties of LED 2835 available according to the characteristics:
- The drop voltage can be 3.1V, 3.2V, 3.6V, 9.8V;
- luminous flux from 20 to 145 per 1 LED;
- current strength from 60 to 300 mA.
The real parameters can only be found out from the datasheet.
Examples of deception from the Chinese
Most sellers on Aliexpress hide the real characteristics and usually overestimate the power. Many people encounter LED car lamps for the first time, as well as conventional LEDs.
Often you have to consult and find out what customers think about lamps. Everyone believes that the more LEDs, the more powerful the light bulb. If there are more than 20 diodes on it, then this is basically a sign of bad LEDs.
In the first photo you see 162 LED 15W and 112 LED 9W corn bulbs. Let's calculate the power of one diode.
- 15W / 162 LED = 0.09W power per 1 ice
162 LEDs were installed to make it easier to sell junk to gullible and illiterate buyers. Those in the know will try to multiply the amount by the well-known power of 0.2W.
The situation is similar with LED lamps for cars. The appearance confirms the words from the product description, super-powerful, super-bright, super-bright. Low-quality diode chips have a wide range of parameters, so the load on each is different. This reduces reliability; the more chips, the greater the likelihood of failure. If they wanted to make a good one, they would install 5 LEDs with an efficiency of 150 lm/W.
LED strip 2835
LED strip 2835 is most often found on low-quality, low-power LEDs. Real consumption can be measured or calculated. When powered by 12 volts and a 151 ohm resistor, as in the photo:
- 3.2V * 3 LED = 9.6V voltage drop
- 12V - 9.6V = 2.4V
- 2.4V / 151 Ohm = 0.015 Ampere current
- 0.015A * 3.2V = 0.048W rounded to 0.05W
It turns out that the tape is very weak, it couldn’t be weaker, at the level of SMD 3528. Instead of 0.2W, we got 4 times less, only 0.05W.
Datasheet SMD 2835
I will give the technical characteristics of the SMD 2835 datasheet with good luminous flux from the Honglitronic brand.
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 in both standard colors and additional colors (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 the overall dimensions of the LED - 2.8x3.5 mm.
LEDs are mounted on the surface using SMD technology (Surface Mounted Device) using group soldering or using a hot-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.
The increased operating temperature of the environment is no more than +85°C, the 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 light 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 a fake; these parameters characterize the real operating conditions of the LED in the 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 a 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.
