Surface mount LEDs feel a bit smaller than capacitors and resistors in the same package. Despite moving to 0603 C and Rs, we still use 0805 LEDs. It’s not just because we’re stuck with a reel of them, we find 0603 LEDs to be more difficult to work with.
As a rule of thumb on a quick prototype we use a 2K resistor with SMD LEDs at 3.3volts, and 4.7K or 10K at 5.0volts. Both are common values we have in bulk. The exact current at those values depends on the exact LED, but usually that’s less then 1mA.
Also on the partlist are two through-hole infrared LEDs. One is fairly narrow (25degrees) one is a little wider (50degrees). Both have a operating current of 100mA, and a pulse up to 1A.
Lots going on behind the scenes today, so the partlist post had to be short. What are your thoughts on LEDs?