0603 resistor with 1203 led smd ?

Other Hardware General Electronics
1

Good day all,

I'm working on my very first project, which is creating a custom pcb for an led chaser. However this project dimensions are really small: 45mm lenght and 8 mm width,

I have to place 6 RGB LED SMD, 2 LED SMD, a microcontroller which is yet to be determined, and the resistors for each led.

My question is: can I use 0603 resistors for 1203 led smd ?

thanks

2

The key is the power dissipation needed for the resistor.

Paul

3

Some (all?) LEDs may share a single resistor - maybe you need to use some PWM tricks to make the brightness equal.
In some circumstances you need no resistor at all.

4

Smajdalf:
In some circumstances you need no resistor at all.

How would you do that? :astonished:

5

You need 1206 quad resistors surely? But check the dissipation.

6

Paul__B:
How would you do that? :astonished:

By low supply voltage. Such as a coin cell battery.

7

Smajdalf:
By low supply voltage. Such as a coin cell battery.

Which have enough internal resistance built in for 20mA LEDs.

Or of course with a constant-current LED driver chip.