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Confusing TO-92 pinout

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BobW

Active Member
This is the pinout diagram from a Fairchild BS270 MOSFET datasheet.
TO92.png
I'm pretty sure that I know which pin is drain, but the jury's still out on the gate and source. What the heck were they thinking when they drew it this way?
 

Mickster

Well-Known Member
Most Helpful Member
I have an iPhone app showing the left pin as drain, centre pin as the gate and the right pin as source.
HTH.
 

ronsimpson

Well-Known Member
Most Helpful Member
upload_2017-8-21_16-5-38.png
It is not clear because the leads cross. (in this picture)
I would solder a 10ok resistor G-S then with a meter test to see if you see the D-S diode.
 

BobW

Active Member
I tried Ron's suggestion, and it showed that the source is at the end. Hence gate is the middle pin as Mickster and John said. Tested it in circuit, and it works correctly. So mystery solved. Thanks everyone.
 

BobW

Active Member
I've been thinking about getting one of those gadgets, but wasn't sure how well they worked at identifying components. I guess I'll have to look into a bit more.
 
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