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September 24 2019

What is SMD LED? What is LED 5050, 5630, 2835

Scroll down to jump to SMD LED 5050 and specification in detail.

SMD LED is a Modern era source of light similar to those that is an incandescent lamp and CLF lamps/bulbs. The only difference is shape, size, color, o/p lumens, and power consumption. So let’s discuss more in detail below in this article.

What is SMD LED?

SMD LED stands for Surface Mount Device Light Emitting Diode.

(smd + led)

It is a light-emitting diode in chip shape.

Surface mount devices are the device that can be mounted on PCB’s easily so the SMD led is the LED which can be mounted on PCB or on light strips directly.

SMD are the applications of Surface Mount Technology (SMT), in this Technology electronic components are made such that they can be placed on printed circuit board or any led strip. This makes the device compact and lite in weight. It also called Chip On Board (COB).

Advantage of SMD led over led with pins:

Compact in size
Square or rectangular in shape
Short leads
More efficient
More luminous flux in small dimensions.
Customizable output power

What is the difference between SMD LED and LED?

The SMD led is small-compact & chip diode while LED, in general, is light-emitting diode with long leads. The only thing that makes SMD chip exceptional that, we can place multiple color light diodes in one chip. Thus, we can achieve any resultant color we want (by color mixing theory).

What is better SMD or LED?

Both are of the Same importance. As both SMD and LED are widely used in various engineering fields depending on the requirement and application.

For example, LED is most commonly used in device indicators, and smd led have is general applications in monitor displays, household LAMP & and many more.
Nowadays smd LED is replacing LEDs with pins in every application, this is quit faster and expected to replace up to 80{42041a7992ac3be9e9e29c856254fb498d8c7935d7cf8512da6802e8688e734a} in applications.
Chip led is costlier than normal led due to its technology and other factors.

Numbers and Chips: What does 5630, 3528 and LED 5050 mean?

There is a Standard Size for chip Diodes only. The physical dimension of the smd LED can be determined by seeing at the Number codes on these Chips.

Other than this the output lumens, the power consumption, efficiency, color, number of leads, etc., can learn by referring to the manufacturer’s datasheet provided with that specific chip diode.
The Led-light chips can have different electrical performances despite having the same code number.
For instance, LED 5730 may come with 1W or 3W wattage ratings. Also, the operating voltage can be different from 2.8 volts to 3.4 volts. It anything depending on the technology.
Polarity is generally printed on the chip as + & –
Different technologies provide different luminous flux also consume more power.

Below is the list of some luminous flux (approx values) of different chips per watts:

i) 2835/ 3528 -> 70 lm / W,

ii) SMD LED 5050 -> 80 lm / W,

iii) 5630 -> 80 lm / W,

iv) 5730-05 -> 80 lm / W,

v) 5730-1 -> 100 lm / W

The general formula for size of SMD chips:

BDLN = Breadth (mm) × Length (mm)

= B.D (mm) × L.N (mm)

where, mm is milimeters

eg. the diode chip code 3014 will be of dimension 3.0 mm × 1.4 mm.

eg. the diode chip code 5050 will be of dimension 5.0 mm × 5.0 mm.

LED 3528 vs 5050 vs 5630 coding revelead?

Below are the in detail information of led 3528 vs 5050 vs 5630.

What is SMD LED 5050?

LED 5050 SMD

Specifications: minimum 3 diode per chip
Dimension /size: 5.0mm x 5.0mm
(Power consumption Wattage: : 0.21 W (3 diode 0.7mW)
Rated current, mA : 60
Nominal luminous flux Lumen: 15 — 18
Voltage: 3.4 – 3.4 volts
Color: Neutral white and RGB
Operating temperature, degrees: normal 80, critical max 110

What is SMD LED 5730? (5730-05, 0.5W varient)

SMD LED 5730

Specifications: min 8 diode (0.6-0.7mW per diode all)
Nominal luminous flux Lumen:~55
Dimension /size: 5.7mm x 3.0mm
Power consumption: Wattage: 0.5W
Temp: -40 To +80
Rated current: (in mA) 150
Voltage: 3.3 – 3.4 volts
Color: multi color including white

SMD LED 5730-1 , 1W varient

Specifications:
Nominal luminous flux Lumen:~100
Dimension/size: 5.7mm x 3.0mm
Power consumption: Wattage: 1W
Temp: -40 To +80
Rated current: 300 mA
Voltage:3.3-3.4 V
Color: white and multi color

SMD LED 5730- 2b3c/ 2b5c/ 2b7c/ 2b10c are the 3 watt, 5 watt, 7 watt, 10 watt varient respectively.

What is smd LED 5630?

SMD LED 5630

Specification:
Nominal luminous flux Lumen: ~40
Dimension /size: 5.6mm x 3.0mm
Rated current, mA 150
Power consumption: Wattage: 0.5W
Voltage: 3.3V – 3.4V
Color: all

What is smd LED 2835 / 3528?

SMD LED 2835

specification: min 1 diode
Nominal luminous flux Lumen: 5 (min)
Dimension /size: 2.8mm x 3.5mm
Power consumption Wattage: ~ 0.06-0.20 W
Rated current, mA 20
Voltage: 2.8 – 3.4 V
Color: white and RGB

Which is the brightest SMD LED?

The 20000 lumens 200Watts (98-106 lm/w) COB is available in the market. Instead, you can use multiple low power chips if you don’t get it.

The brightness of the LED chip depends on the number of diodes (light-emitting diodes) used in it. Thus More number of diode more the brightness of the SMD. Currently, the brightest SMD LED available in the market is in the series of led 5050, 5730.

You need to refer the specification of the respective LED with its number, as these numbers are only the physical dimensions. Only length and breadth can be concluded with these numbers and nothing else.

Application of these light chips:

In tube lights and bulbs for a streetlight, home appliance and night limps, etc.
For automobile head-light, spotlights.
Moving message display in advertising.
Televisions and computer screens.

Difference between LED 5050 Vs 5730 VS 2835:

LED Chip->	5050	2835	5730
Dimension (size)	5.0mm x 5.0mm	2.8mm x 3.5mm	5.7mm x 3.0mm
Min. power	0.21 W	0.06 W	0.5 W
Approx. current,	60 mA	20 mA	100 mA
Lumen	15-18	5	55

Disclaimer: Please check the datasheet provided by the respective supplier when you are working on some Projects and research.

August 9 2019

3 Best ways to test a relay? in 5 minute

smt Blog How to Test a Relay without multimeter?, How to Test a start Relay?

Depending on the type of relay we will discuss how to test a relay using different methods.
First of all, identify the relay you want to test with the help of the image given below. From this image check the similar match relay. (Scroll down for explanatory video)

general types of relay we see in day to day life to test a relay
The first is starter relay in a bike, 2nd image is a 5 pin relay used in cars also called as starter relay, 3rd is a relay which is used in electronic circuits, we will learn how to test a relay of each type.

General and most common faults found in starter relay are at:

i) Coil: ( burnt coil, broken connection)
ii) Movable contact: (lost its flexibility, carbon covered/rusty contact due to sparks)

pinout diagram of relay

Pinout diagram with the notation:

NC: Normally closed
NO: Normally opened
COM: Common
C1/C2: Power supply to the coil

(just keep in mind that types of relay differ only on the basis of the number of terminals but the actual principle of working is same i.e principle of electromagnetism). If you have identified the type of relay with the help of the above image, then just follow one of the following methods.

Check how to test a relay with multimeter in different ways:

For type 1 and type 3 relay

The first method is by using a multimeter, set the mode of multimeter in the Continuity mode.

Step1: Connect the two probe of multimeter to the coil terminals ( C1 & C2) as shown
if it buzzers then your Electromagnetic coil is OK.
If it does not buzzer this means that your coil is Faulty.

Step2: Once it buzzers, you need to check the output terminals of the relay. Connect your multimeter probe to the terminal contact (NO & COM) if it doesn’t buzzer this means that contact terminal is Ok, otherwise, it is Faulty.
or
Connect your multimeter probe to the terminal contact (NC & COM) if it Buzzers means that contact terminal is Ok, otherwise, it is Faulty

How to test a relay for type 2:

Step1: The two probe of multimeter and the coil terminals 85-(C1) & 86-(C2) are to be connected as shown. If the buzzer ring then your exciter coil is Ok (check above images).

Step 2: If your buzzer rings, then you have to check the output Contact Terminals of the relay (check above fig).

(NO terminals) Connect your digital multimeter probe to the terminal (87 & 30), if the Buzzer does not ring this means that the contact terminal is working fine, otherwise, it is faulty.
or
(NC terminals) Connect your multimeter probe to the terminals (87a & 30), if the Buzzer sounds, means relay movable contact is fine, otherwise it is faulty.

How to test a relay with a multimeter:

(resistance mode)

(common for all type)
At first, Set the mode of multimeter to the Resistor mode. Then connect the Red and Black probe of the multimeter to the coil of the relay:

Observations:

The value of resistance for or type 1 relay should be between 30Ω to 150Ω.
For type 2 relay, the resistance value should be between 300Ω to 900Ω.
And for the type 3 relay, the resistance value should be between 20Ω to 450Ω.

Along with it, NO and COM contacts must show 0 Ω, which means it is open-circuited when no input is given.

[ important: You must refer to the datasheet of this devices before concluding to a result. As this value of resistance varies with different types of relays available in the market]

How to test a relay without a multimeter?
Apply a 12 volt/9 volt/5-volt power supply to the coil (apply voltage according to the rating printed on it) and you will hear “crisp-click” sound, this indicates that your movable contact is working fine and thus the relay coil is in good condition. (This method only checks weather coil is working or not)

Bonus tips:

If your start relay is not working or working occasionally then consider replacing it with a new one this is because your relay’s movable contact might get covered with carbon.
Our team has observed that some motorbikes/ mopeds which are available in the market have starter relay problem more often Yamaha’s starter relay is at top.

Relay a device that drives high power circuit with the help of the low power circuit, a relay is necessary for the circuit where we have a small current it and need to drive high current applications. It is very commonly used in motorbikes and cars to drive the ignition.

Home Automation Systems installs a large number of relays to control various home appliances remotely and through chips.

The symbol of an electrical relay is as shown:

When the current through electromagnetic coil flows it acts as a temporary magnet and attracts the movable coil which changes the circuit arrangement and this change is utilized to work as required.

Therefore when we supply power to a coil it closes the circuit and If we retract the power to the coil, then the circuit loses its connection with the terminal. Therefore, the circuit is opened.

In conclusion, the relay is an “electromagnetic switch” for controlling high current devices with the low current circuit.