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Sanyo FBET process
Sanyo FBET process
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Old 18th June 2009, 03:10 PM   #1
syn08 is offline syn08  Canada
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Default Sanyo FBET process

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
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Old 18th June 2009, 03:28 PM   #2
h_a is offline h_a  Europe
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Quote:
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
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Old 18th June 2009, 03:40 PM   #3
EUVL is offline EUVL  Europe
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> anything significant happened in development of discretes in the last decades.

Lots. Much more than you can imagine.


Patrick
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Old 18th June 2009, 03:48 PM   #4
syn08 is offline syn08  Canada
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Quote:
Originally posted by EUVL
Lots. Much more than you can imagine.
For sure, in particular for microwave devices. This is not helping us, though
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Old 19th June 2009, 06:22 AM   #5
Lumba Ogir is offline Lumba Ogir  Sweden
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syn08,
Quote:
I don't see any other discrete manufacturer picking up and filling the gap.
I`d consider such fabrication as undependable.
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Old 19th June 2009, 08:57 AM   #6
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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
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Old 19th June 2009, 09:17 AM   #7
Lumba Ogir is offline Lumba Ogir  Sweden
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Hannes,
video transistors were developed for CRT monitors.
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Old 19th June 2009, 09:49 AM   #8
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I thought that the FBET-Sanyos are exactly for this purpose?

Have fun, Hannes
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Old 21st June 2009, 02:20 PM   #9
Fanuc is offline Fanuc  United Kingdom
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Default Re: Sanyo FBET process

Quote:
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
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Old 21st June 2009, 02:29 PM   #10
syn08 is offline syn08  Canada
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Default Re: Re: Sanyo FBET process

Quote:
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.
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