I am in desperate need for a cheap, low threshold MOSFET to be used in a compact pcb switch mode power supply I'm designing. I'm not asking lazily for others to do my work for me, I simply have failed twice now with an attempt to find a suitable one. With the following criteria:
6V Max - Drain Source Voltage
200ma Max - Drain Source Current
This is for low frequency - Don't need fast switching
Ideally, in a small SOT23 package.
And as CHEAP as can be.
1.5 V Gate Source Threshold - This is where my problem has been.
I tried this one, advertised as 1.9 V. The max value given is 2.6. I feed 2.8V into the gate, and to my disappointment absolutely no switching occurs. Only at 3V did noticeable conduction occur, and complete switching only at around 3.4V. The datasheet seems to be dishonest.
Should I always expect full switching to be a full volt over the given max?
That being said, should I choose one with a 1.8V threshold or less?
A particular recommendation would be excellent if one is familiar.
-I appreciate any help
6V Max - Drain Source Voltage
200ma Max - Drain Source Current
This is for low frequency - Don't need fast switching
Ideally, in a small SOT23 package.
And as CHEAP as can be.
1.5 V Gate Source Threshold - This is where my problem has been.
I tried this one, advertised as 1.9 V. The max value given is 2.6. I feed 2.8V into the gate, and to my disappointment absolutely no switching occurs. Only at 3V did noticeable conduction occur, and complete switching only at around 3.4V. The datasheet seems to be dishonest.
Should I always expect full switching to be a full volt over the given max?
That being said, should I choose one with a 1.8V threshold or less?
A particular recommendation would be excellent if one is familiar.
-I appreciate any help