Which leg is which for PNP power MOSFET IRF5305PbF?

[seanspotatobusiness]

I have PNP power MOSFETs called IRF5305PbF. The datasheet doesn't say which leg is which. Should it be obvious?

 

[73's de Edd]

Sir seanspotatobusiness . . . . .


WHUT you taklin' 'bout . . . . . . . . . . Willis ?
Whut you gonna do . . . . . .wire this up to a "tater " eye incubator ?
Notice that it has 2 drain connections ∴ you could change out the cooling oil in a HURRY on that sucker !



73's de Edd

My wife and I always compromise . . . How? . . . “I admit I am wrong and she agrees with me!”

 

[Harald Kapp]

I have PNP power MOSFETs called IRF5305PbF.

You can't.
PNP is a bipolar transistor, not a MOSFET. What you have is a P-channel MOSFET.

 

[73's de Edd]

"Notice that it has 2 drain connections" ( OPTIONS)

 

[seanspotatobusiness]

Thanks very much. It was for a project to light a green LED whenever my ESD grounding point is connected to ground but it turns out that neither a transistor nor MOSFET is suitable (a MOSFET even less so because it lights up when I touch the probe without a need for two connections to ground).

Do you think it's sketchy to connect my PSU ground to earth for this? The PSU will be a PC PSU and used to power a few other pieces of equipment (network switch, Raspberry Pis, label printer). Originally I was advised to use a "high side" circuit but they're too sensitive and light the LED even when the connection to ground is poor.

 

[Harald Kapp]

a project to light a green LED whenever my ESD grounding point is connected to ground

The ESD grounding point is usually connected to earth potential using a resistor in the MΩ range. The explanation is e.g. here.
The circuit in your link may be suitable when you replace the NPN by a MOSFET. You'll have to add a resistor from gate to source to reduce sensitivity to small charges (as you have noticed). Also a series resistor and a zener diode to protect the gate from overvoltage are advisable. Hre's a rough sketch:

 

[Cannonball]

Sir seanspotatobusiness . . . . .


WHUT you taklin' 'bout . . . . . . . . . . Willis ?
Whut you gonna do . . . . . .wire this up to a "tater " eye incubator ?
Notice that it has 2 drain connections ∴ you could change out the cooling oil in a HURRY on that sucker !

View attachment 45163

73's de Edd

My wife and I always compromise . . . How? . . . “I admit I am wrong and she agrees with me!”

Sir that is real diplomacy!