27 Nov
2021
27 Nov
'21
3:09 p.m.
139 is a "nickname" number. IBM used these nicknames for some reason,
instead of the full IBM part number.
A 139 is really an IBM part number 2414938, a silicon device in a TO-18.
Gee, it would be great if this list could take pictures so I could
just post one with all the specs...
--
Will
On Sat, Nov 27, 2021 at 5:54 PM Brent Hilpert via cctalk
<cctalk at classiccmp.org> wrote:
On 2021-Nov-27, at 11:22 AM, Gregory Beat via cctalk wrote:
The Texas Instruments (TI) 139 is likely a 2N139 PNP (BJT) transistor,
capable of high speed switching (in that era).
The 2N139 was originally an RCA transistor (tall cylinder) found in RCA and GE transistor
radios (455 kHz IF section).
The TI versions were low profile metal case, TO-33 case (8.5 to 9.5mm diameter)
From the JEDEC number, 2N139 would be a 50s-era transistor, way earlier than the ones at
issue.
2N139 specs are Ge-PNP, 16V/12V CE max, 15mA IC max, 35mW max, which can find a use in
transistor radios, but highly unlikely to be what the OP is looking for.