I have a small SOT-23 (3 pins, transistor-like) device that burned out (shorted between 2 pins). I need to identify it so i can replace it, but i can't find the code at all.
The code is: SE and a simbol like a horizontal "P". Like this image:
Here's a picture of the device, although i don't think it will help much:
I'm not sure if it's a transistor, FET or diode.. It belongs (apparently) to a driver circuit for a P-Channel Power Mosfet, but that's all i can share because the circuit is almost impossible to follow.
Looked the code up on many webpages and can't find anything but a "2SC4703" RF transistor, but it's definetly not one suited for the actual circuit.
Any help would be apreciated.
Best Answer
It is most likely a Schottky barrier diode to accelerate the turn-on/turn-off speed of the gate of the PMOS. From the information given, it is hard to point on what consumer it is actually from. We would need more details for this. But what you could do is unsoldered the part and perform a few test to confirm my hypothesis.
Apply a small voltage (0.5V) and put a small load on either pin on the side with two pins. See if it conducts. Apply a larger voltage (2-5V) and look at the voltage drop of the diode (if it is indeed a diode).
You could also put the part on a curve tracer to see the characteristics like the breakdown voltage and the forward voltage. It is either two Schottky barrier diodes in parallel or a single one as shown below:
For a PMOS device, I would expect the diode to be arrange like the middle picture. Either single or double.