[TriEmbed] Substitute transistor
paulmacd at acm.org
Sat Dec 18 14:01:58 CST 2021
I replaced the transistor with an exact match from ebay and a couple of electrolytic caps (at Carl’s suggestion).
The display is still dim. Oh well.
From: TriEmbed <triembed-bounces at triembed.org> On Behalf Of The MacDougals via TriEmbed
Sent: Friday, November 26, 2021 9:11 PM
To: triembed at triembed.org
Subject: [TriEmbed] Substitute transistor
My microwave display suddenly went very dim. I opened it up and found a discolored
spot on a circuit board feeding the display (see attached image). That component is
marked B1238, so I assume it is a 2SB1238, which is obsolete.
Medium power transistor( 80V, 0.7A) 2SB1189 / 2SB1238 Features 1) High breakdown voltage, BVCEO= 80V, and high current, IC= 0.7A.
2) Complements the 2SD1767 / 2SD1859. Absolute maximum ratings (Ta=25C) Parameter Symbol Limits Collector-base voltage VCBO −80 Collector-emitter voltage VCEO −80 Emitter-base voltage VEB O −5 Collector current IC −0.7 C.
Anyone want to help me find a replacement?
I dug through my Dad’s stash of old electronics and found a TIP30B, which looks like it might work.
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