Sanyo FBET process

[syn08]

Don't know where to put this, I thought it could be interesting.

This marketing document from Sanyo talks a little about the FBET/LSBT process, the source of some amazing devices manufactured there.

http://home.arcor.de/thomasfetzer/Sanjo/SY103A_e.pdf

Following the drawings and the short explanation, it's clear that this process uses shallow (probably ion implanted) local thin base regions, and polysilicon emitters. This is a seven to eight mask process, compared to three to four in a regular bipolar discrete shop. No wonder the performances and also no wonder why these devices are expensive.

The FBET/LSBT process was completed in 1981. For a process to survive in production for almost 30 years, that's really a long time!

The bad news is that if Sanyo is going to discontinue it's line of discretes, I don't see any other discrete manufacturer picking up and filling the gap. It's very expensive and unlikely to have a good quick ROI. It's much more complicated to second source the Sanyo bipolar devices than (e.g.) Toshiba's 2SK170/2SJ74

[h_a]

The FBET/LSBT process was completed in 1981.

Now, please tell me someone that anything significant happened in development of discretes in the last decades.

Have fun, Hannes

[EUVL]

> anything significant happened in development of discretes in the last decades.

Lots. Much more than you can imagine.


Patrick

[syn08]

Originally posted by EUVL
Lots. Much more than you can imagine.

For sure, in particular for microwave devices. This is not helping us, though

[Lumba Ogir]

syn08,

I don't see any other discrete manufacturer picking up and filling the gap.

I`d consider such fabrication as undependable.

[h_a]

Well, I am a little aware of the development concerning power mosfets, but that's for switching and I was more pointing in the small signal or in general linear direction...

That simple low-noise jfets (K170) are a thing of the seventies I can understand, but that the FBET-process dates also back to 81 I wouldn't have expected.

Maybe you could shortly elaborate what I'm missing?

Have fun, Hannes

[Lumba Ogir]

Hannes,
video transistors were developed for CRT monitors.

[h_a]

I thought that the FBET-Sanyos are exactly for this purpose?

Have fun, Hannes

[Fanuc]

Originally posted by syn08
Don't know where to put this, I thought it could be interesting.

This marketing document from Sanyo talks a little about the FBET/LSBT process, the source of some amazing devices manufactured there.

http://home.arcor.de/thomasfetzer/Sanjo/SY103A_e.pdf

Following the drawings and the short explanation, it's clear that this process uses shallow (probably ion implanted) local thin base regions, and polysilicon emitters. This is a seven to eight mask process, compared to three to four in a regular bipolar discrete shop. No wonder the performances and also no wonder why these devices are expensive.

The FBET/LSBT process was completed in 1981. For a process to survive in production for almost 30 years, that's really a long time!

The bad news is that if Sanyo is going to discontinue it's line of discretes, I don't see any other discrete manufacturer picking up and filling the gap. It's very expensive and unlikely to have a good quick ROI. It's much more complicated to second source the Sanyo bipolar devices than (e.g.) Toshiba's 2SK170/2SJ74

I doubt any these transistors have been used in audio anyway - the sanyo types. So a non issue to me. Remember ring emitter Q's was in production in 1984 and could challange some mosfets in certain areas easily but to no avail.

Regardless the 2SJ74 is a disgrace to the audio community with respect to very high non linear capacitance and high gm.

Cheers

Kevin

[syn08]

Originally posted by Fanuc

I doubt any these transistors have been used in audio anyway - the sanyo types.

Regardless the 2SJ74 is a disgrace to the audio community with respect to very high non linear capacitance and high gm.

You must be joking.