On 2012 Apr 11, at 1:23 AM, Rob Jarratt wrote:
I need to replace a transistor in my H7140 PSU for my
PDP11/24. The
transistor is marked GPSA55J3 and the printset identifies it as
"XA 55 PNP 500MW SI 60 50 P", it is in a TO-92 package.
The basic specs for the common Motorola MPS-A55 are, in summary:
Polarity: PNP
Power Dissipation Pd: 500 mW
Material: Si (Silicon)
C-E voltage Vceo: 60 V
Current Gain hFE: 50
Package: TO-92
Well, it used to be common at least (in the 70s & early-80s, i.e.
when the 11/24 was made).
Just a suggestion. I'd elaborate some more but it's very late.
I have tried to find specs for
an A55 and can only find partial matches, so I am not sure what
today's
equivalent would be. Can anyone help me work out what the
equivalent today
would be?