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bipolar (bjt) transistor families for audio power output stages
bipolar (bjt) transistor families for audio power output stages
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Old 5th August 2017, 10:39 AM   #831
Walkalone is offline Walkalone  Viet Nam
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ON Semi's fast devices that have clear mid sounding, tight bass. But Sanken 2SC2922 LAPT give me an excellence in treble.
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Old 3rd January 2018, 01:51 PM   #832
tiefbassuebertr is offline tiefbassuebertr  Germany
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Quote:
Originally Posted by Walkalone View Post
ON Semi's fast devices that have clear mid sounding, tight bass. But Sanken 2SC2922 LAPT give me an excellence in treble.
Are you do this observation in general or only in a certainly circuit topologies, where the output buffer operate in Class AB (idle current arround 20-50mA for each pair ?

From post #1 I have selected the versions with the highest value of ft - except the SANKEN versions most of them out of production unfortunately:
NEC
2SA1141/2SC2681 blue/bl 115V 10A 100W hfe: 60-200 80MHz similar TO247 (no orig. NEC datasheet)
2SA1227/2SC2987 gr/bl 140V 12A 120W hfe: 60-320 50MHz similar TO247
2SA1227A/2SC2987A gr/bl 140V 12A 120W hfe: 60-320 50MHz similar TO247
Toshiba
2SA1095/2SC2565 160V 15A 150W hfe: 40min 60MHz RM60 (34,3x16,3x5,3mm), old type, gr/bl
SANKEN
2SA1186/2SC2837 150V 10A 100W hfe: 50min 60MHz TO-3P (MT100)
2SA1303/2SC3284 150V 14A 125W hfe: 50min 50MHz TO-3P (MT100)
2SA1215/2SC2921 160V 15A 150W hfe: 50min 50MHz MT200
Fujitsu
2SA1043/2SC2433 120V 10A 150W hfe: 35-200 60MHz TO-3, old type
2SA1044/2SC2434 70V 10A 150W hfe: 35-200 60MHz TO-3, old type
2SA1075/2SC2525 gr/bl 120V 12A 120W hfe: 60-200 60MHz RM60 (34,3x16,3x5,3mm), old type
2SA1076/2SC2526 gr/bl 120V 12A 120W hfe: 60-200 60MHz RM60 (34,3x16,3x5,3mm), old type
Matsushita
2SA1064/2SC2488 150V 8A 100W hfe: 40-280 50MHz TO-3
2SA1065/2SC2489 150V 10A 120W hfe: 40-200 50MHz TO-3

Independent of the circuit topology the consequences are different by replace such types with such of low ft arround 4MHz.
What happens exactly by the various versions of front-ends and output buffers (like Harman's T-Circuit or Linn's CFP approach) - particularly concerning stability behaviour, THD-behaviour and audible sonic character ?
Are there special tasks in the individual circuit topology to avoid disadvantages by sound quality ?
Thank you for advices.

Last edited by tiefbassuebertr; 3rd January 2018 at 02:03 PM.
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Old 3rd January 2018, 08:27 PM   #833
stocktrader200 is offline stocktrader200  Canada
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the faster the better for BJT outputs.
BJT's require far more current to turn off then on unlike Mosfets that turn on / off due to Vgs. mosfets also have a much smoother turn on region between 3 - 4 volts rather then .6 to .7 volts.
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Old 21st January 2018, 12:22 PM   #834
tiefbassuebertr is offline tiefbassuebertr  Germany
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according the presently available line-up of audio power devices there are some new versions - OTOH the ones in MT-200 outline are not longer listet - go to
Audio |Sanken Electric
most interesting types for replace a lot of no longer available output devices seems to be this:

http://www.semicon.sanken-ele.co.jp/...151a_ds_en.pdf
http://www.semicon.sanken-ele.co.jp/...011a_ds_en.pdf
and
http://www.semicon.sanken-ele.co.jp/...223a_ds_en.pdf
http://www.semicon.sanken-ele.co.jp/...145a_ds_en.pdf

But the most imrortant difference I don't find in the datasheets.

Last edited by tiefbassuebertr; 21st January 2018 at 12:50 PM.
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Old 21st January 2018, 01:00 PM   #835
sajti is offline sajti  Hungary
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As I know, the 2SC3519 and the 2SA1386 pair use same die as the 2SC2922/2SA1216.

Sajti
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Old 21st January 2018, 01:27 PM   #836
tiefbassuebertr is offline tiefbassuebertr  Germany
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Quote:
Originally Posted by sajti View Post
As I know, the 2SC3519 and the 2SA1386 pair use same die as the 2SC2922/2SA1216.

Sajti
This is correct according this image under
Counterfeit Transistors
(fourth image)
and
http://i.ebayimg.com/images/i/201497...-1/s-l1000.jpg
The die is attached to a TO3P type heatsink which is in turn bonded to a larger heatsink contact face (therefore a MT200 outline).

The abbreviation "LAPT" confuses me.
Under
2SA2223 - Power Transistor -260V -15A (Master Part)
I read LAPT (High frequency multi emitter transistor)
Under
http://www.semicon.sanken-ele.co.jp/...223a_ds_en.pdf
there is to read this:
LAPT (Linear Amplifier Power Transistor)
And under
Sanken audio components at Profusion
is mentioned this definition
LAPT (Large Area Parallel Transistor)
Only the last mentioned definition I know - go to
http://www.profusionplc.com/brands/sanken
and post 11 under
How many transistors inside 2SA1302/2SC3281 ?
so as post #2 under
The skinny on Sanken 2SA1216 Epitaxials

Last edited by tiefbassuebertr; 21st January 2018 at 01:55 PM.
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Old 24th January 2018, 06:44 PM   #837
SVI2004A is offline SVI2004A  New Zealand
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bipolar (bjt) transistor families for audio power output stages
SanKen have 3 types of high power transistors

Single chip, LAPT and Darlington

See pic
Attached Images
File Type: png 53C0803D-E9AA-44C4-B045-29465E0E11FB.png (534.9 KB, 220 views)
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Old 24th January 2018, 07:21 PM   #838
SVI2004A is offline SVI2004A  New Zealand
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bipolar (bjt) transistor families for audio power output stages
Have a cool SanKen pdf but I can’t upload it here as it’s 1.5 meg...
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Old 24th January 2018, 10:20 PM   #839
ilimzn is offline ilimzn  Croatia
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MT200 devices have been obsoleted with the advent of the newer generation thin die LAPT. The die geometry and electrical performance is the same but the thinner silicon makes it possible to dissipate MT200-like power in a MT100 case. Since the MT200 has become unique to Sanken, it is probably a large factor in the cost of a transistor, and also probably an increasing percentage of the price.
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Old 27th January 2018, 05:16 PM   #840
SVI2004A is offline SVI2004A  New Zealand
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bipolar (bjt) transistor families for audio power output stages
3 pairs in my list of MT200 are LAPT
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