[Diy_efi] Re: A 2N2222A can handle up to 50mA

[Marteney, Steve]

Seems like you (or whoever) missed a decimal place in the above subject
line.  The Fairchild 2N2222A can carry currents up to 500mA and has a
collector current abs max rating of 1.0A.  The biggest problem is its ~300
Hfe requiring ~2mA of bias current to get that much current out of it.  Some
logic families can't do it (like trying to use an HC11 output directly which
can only source/sink approx 500uA.)

I would not be so hasty in steering someone away from the 2N2222A with
inaccurate data.

Steve

-----Original Message-----
From: Phil Lamovie [mailto:phil at injec.com]
Sent: Monday, February 17, 2003 9:38 AM
To: List for general do-it-yourself EFI talk
Subject: [Diy_efi] Re: A 2N2222A can handle up to 50mA 




Automotive relays need 180 to 250 mA pull in current.

They can hold at half to a third if you care to P/H

I would suggest something a little more robust like a
BD139  NPN 80 volt 1100 mA and solid without a heatsink
for this purpose.


HTH

phil


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