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 <[email protected]> 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.
