fairchild semi, new audio output devices

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#5
Very nice, but with the Toshiba TO-264 2sc5200/2sa1943 still easily available for just over a dollar in quantity, I can't see the TO-220 versions picking up unless they're priced at 50 cents or so. However, the TO-3P 2sc5242 looks more interesting to me - sacrifices just 20W in Pd and can be retrofitted in legacy TO-3 mountings (it's better than the 2sc5198/2sa1941 TO-3P pair for this purpose).

I tried to get the Fairchild Spice models forwarded by e-mail from the link provided, but it doesn't seem to work. Can somebody who has downloaded the models successfully please post them here?
 
#6
Good thing about them being available from Fairchild is that you can buy direct from Fairchild - even if you're a hobbyist. This means you are guaranteed genuine devices.

In the UK, I've not once seen anyone actually selling "Toshiba" branded ones - if you find them, theyre Magnatec.
 
#7
Out here, Magnatec and most Fairchild devices (except some small signal stuff) are unobtainium. But Toshiba is available in quantity, probably sourced from wholesale distributors in Singapore. The genuine 2sc5200/2sa1943 pair is sometimes 50% of the price of the Chinese fakes at retail here - go figure...

Meanwhile, on the subject of transistors with interesting specs - check out the Sanyo 2sc3807. Vceo=25v, fT=260 MHz, Ic=2A, Cob=27pF and hFE=800..3200 - not a darlington! These are available retail here for about $0.20, and almost all of them have hFE > 1500.
 
#8
Spice models


* KSA1943 PNP EPITAXIAL SILICON TRANSISTOR
*---------------------------------------------------
* AUDIO POWER AMPLIFIER
* High Current Capability(Ic=15A)
* High Power Disspation
* Wide S.O.A
* Complement to KSC5200
*---------------------------------------------------
.MODEL KSA1943 PNP (
+ IS =3.5476E-11
+ BF =159.9
+ NF =1.0
+ BR =25.75
+ NR =1.011
+ ISE =2.5119E-10
+ NE =2
+ ISC =7.9433E-11
+ NC =1.37
+ VAF =60.0
+ VAR =11.07
+ IKF =2.8370
+ IKR =0.3548
+ RB =2.74
+ RBM =0.0381
+ IRB =3.6308E-3
+ RE =0.06
+ RC =0.01
+ CJE =4.1783E-9
+ VJE =0.6354
+ MJE =0.3374
+ FC =0.5
+ CJC =1.1383E-9
+ VJC =0.5
+ MJC =0.3699
+ XCJC =0.7624
+ XTB =1.5306
+ EG =1.1751
+ XTI =3.0 )
*-----------------------------------------------------
* FAIRCHILD PUCHUN S.KOREA CASE: TO-3P PID:KSA1943
 
#9
* KSC5200 NPN EPITAXIAL SILICON TRANSISTOR
*---------------------------------------------------
* AUDIO POWER AMPLIFIER
* High Current Capability(Ic=15A)
* High Power Disspation
* Wide S.O.A
* Complement to KSA1943
*---------------------------------------------------
.MODEL KSC5200 NPN (
+ IS =4.3031E-12
+ BF =152.1
+ NF =1.0
+ BR =6.155
+ NR =1.028
+ ISE =1.3924E-11
+ NE =1.5
+ ISC =2.7542E-11
+ NC =1.95
+ VAF =60.0
+ VAR =6.51
+ IKF =10.8637
+ IKR =0.1585
+ RB =2.47
+ RBM =0.02
+ IRB =0.08
+ RE =0.04
+ RC =0.015
+ CJE =5.8111E-9
+ VJE =0.6506
+ MJE =0.3357
+ FC =0.5
+ CJC =6.4394E-10
+ VJC =0.5
+ MJC =0.3966
+ XCJC =0.7624
+ XTB =1.0445
+ EG =1.1663
+ XTI =3.0 )
*-----------------------------------------------------
* FAIRCHILD PUCHUN S.KOREA CASE: TO-3P PID:KSC5200
 
#10
as far as linearity (beta vs. Ic) i think the MJL3281/1302 xistors still have them beat, but they (C5200/A1943) are also stabilized beta devices and are more linear than MJ15024/15025 devices (which for a long time were the "standard" output devices in american audio designs).
 
#14
unclejed613 said:
http://www.fairchildsemi.com/pf/FJ/FJP5200.html
http://www.fairchildsemi.com/pf/FJ/FJP1943.html

it seems that the 2SC5200/2SA1943 devices are being licensed to other manufacturers.
Click to expand...

These are fast, for being TO-220, with same Ft, 30MHz, as MJE15030/31.
But
- they can take more power/heat. Rjc = 1.25 C/W (MJE15031 = 2.5 C/W )
- they have maybe? similar current gain as MJE15031


Usage? .... some ideas, for the TO-220 variant:
.. drivers for high/very high power output stages
.. potent hifi headphone output stage
.. higher power hifi line pre-amplifier output

Question:
How easy/difficult will it be to find dealers .. in most part of world?
The really interesting package would be TO-264, 150 Watts.
But will they be easily & commonly available?


lineup 🙂 thanks to unclejed for interesting info
 
#18
Re: sparce datsheets

Bob Cordell said:

It is sad to see that they do not have any ft vs collector current graphs.
Their models are probably more trustworthy than those from OnSemi,
but the OnSemi datasheets seem to have more information.

Cheers,
Bob
Click to expand...


Yes, Mr Cordell, 'Bob', I made that observation, too.
I wanted to see the same Curve of GBW ( Ft = transistion frequency, is it? ) to current level.

But maybe in some other PDF of similar device, the have it?
Otherwise we will have to do some good guesses.


Regards, Lineup
 
#19
Early voltage

linuxguru said:
........
Meanwhile, on the subject of transistors with interesting specs - check out the Sanyo 2sc3807. Vceo=25v, fT=260 MHz, Ic=2A, Cob=27pF and hFE=800..3200 - not a darlington! These are available retail here for about $0.20, and almost all of them have hFE > 1500.
Click to expand...

Hi,

Such extreme hFE is not always favorable (depending on your application). The higher the beta, the lower the Early voltage. The product of these two parameters is fairly constant: 10k...20k.

Cheers.
 
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