Hi everyone,
I've never had to decipher an SMD code before, so I thought I'd run my thoughts past you bunch of helpful folks to make sure I'm on the right track.
I've identified a failed SMD transistor (shorted) on an LED light strip controller PCB. The transistor outputs directly to the LED strip. There are 5 on the board, one for each colour channel (one removed in photo for testing).
The board runs on 24v from a CV 0.83A 20W power supply.
I'm pretty sure the component is a SOT-23 package. Length and width seem about right.
The markings on the component are WKC 72. I'm not quite sure which part of the marking is significant. I used
this codebook as a reference. Initially I thought the
WKC was the important part. This lead me to
BCR119![](https://i.imgur.com/nO3nTSy.png)
However I'm not sure if this is right. If the
72 is the important part, then it could be
2N7002![](https://i.imgur.com/mIN7KER.png)
The silkscreen designates the component with an M. MOSFET? I'm thinking the 2N7002 is most likely correct. Am I correct in my assumption?
Looking at
octopart, they come in a variety of continuous drain currents. What would be a safe choice for my application?
![](https://i.imgur.com/N5o7CCp.jpg)
Thanks for any help or advice
![Grin ;D](https://www.eevblog.com/forum/Smileys/default/grin.gif)