LM317/337 Identification

[chienmort]

Hi,

I bought some Surface mount LM317 and LM337 regulators sometime ago. Now I need to use them, and I cannot identify which is which. The markings are very much like data production code rather than device type numbers. can anyone tell me how to tell which is which?

 

[avtech]

N02A seem to refer to LM337
https://www.aliexpress.com/item/32882898958.html

The L3 appear to be LM317
https://www.alibaba.com/product-det...-Voltage-Regulator-SOT-223_1600097403959.html

 

[Mooly]

If in doubt just power them up in the same test circuit (say for a positive 6V configuration) using a current limited supply or an adjustable voltage bench PSU and series resistor feeding the regs. Two minutes of a job to identify which is which 🙂