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These are near-universal replacements for TO-3 package output devices in many vintage SS amps and receivers.

EchoWarsAug 9, Do you already have an account? Share This Page Tweet.

EchoWarsAug 4, They’ve been out of production for many years, and any ‘new’ devices you may find are certainly Chinese remakes that are not to be trusted.

One of the output transitors blew in the process.

They didn’t sell it so much as simply spun it off as a new business during Motorola’s financial restructuring back in ‘ The D and B are the most counterfeited transistor in history. Log in or Sign 2sd24. If not, then how is component quality assured? I am not comfortable comparing the graphs on the datasheets and was hoping that one of the Jedi Masters here can help.

I know I need to replace all 4 along with the other 4 on the positive rail. But of course Motorola had to sell the dang semi biz.


2SD Datasheet Toshiba pdf data sheet FREE from

It might be fun to get a pair and cut them open, if they aren’t too expensive. No, create an account now. Heck, Motorola even made or resold? In my view, this response falls short of the need.

On-Semi was a spin-off from Motorola, when Moto divested the discrete semiconductor biz from the IC biz. Your name or email address: No, create an account now. BinaryMikeAug 9, New On-Semi devices purchased from a reliable source, such as Digikey or Mouser are infinitely preferable, unless you enjoy seeing your hard work explode before your eyes.

I didn’t mean it to sound that way. EchoWarsJun 14, MayankJun 15, You must log in or sign up to reply here. I think use MJ, and the other one that I cant think ofdatashet. You must log in or sign up to reply here. EchoWarsFeb 23, Datashwet, my password is: Oregon, land of dahasheet stumps. Well even better are the mj, or find the new number from “On” of those.

Does MCM use a curve tracer and die inspection for replacement component quality assurance? Thanks for your guidance EW! MayankJun 14, As far as ordering out-of-production Japanese transistors from unknown sources, only if you’re determined to learn a lesson the hard way, I might add that myself and others have already learned at great financial cost and much labor rebuilding damaged boards.


BinaryMikeAug 4, EchoWarsFeb 24, Your name or email address: Share This Page Tweet. I just want dtasheet try and buy the “best” transistors and I am trying to understand some of the differences in specs.

Toshiba 2SB554/2SD424 equivalents

Gary, whose title is Technical Advisor, initially responded with the following comments: The post up top has some other numbers, but if I would have known to use the Motorola’s even when these B,D where around I would have used those Mj’s instead.

Log in or Sign up. All employees working for Moto’s semiconductor biz and all intellectual property were part of the package. Toshiba hasn’t made these in years and years.

2SD Datasheet PDF –

I decided to get MCM’s view on this issue. If you really want those devices, buy new parts made by On-Semi from Mouser or Digikey. Yes, my password is: Do you already have an account? I created a major fireworks display when my test probe slipped and shorted on a nearby component while trying to adjust the bias: MCM is a reliable source, so they’re very unlikely to be counterfeits.