Transistor datasheet and x-ref

J

Jeff D

Guest
Not having success find anything on a Toshiba 2SC789-R transistor. It's part
of the pre-amp circuit from a vintage Pioneer Quad Stereo Receiver. Any
ideas ?
 
Not having success find anything on a Toshiba 2SC789-R transistor. It's part
of the pre-amp circuit from a vintage Pioneer Quad Stereo Receiver. Any
ideas ?
Click to expand...
Hmmm. Doing a web search on 2SC789 (without the suffix) leads to a
few possibilities, including a Japanese transistor cross-reference
list. This list indicates that the 2SC789 crosses to 2SD313 and
2SD526, both of which are low-frequency epitaxial NPN power
transistors in TO-220 cases. 60-80 volts, 4 amps, fT around 8 MHz.

Another hit on the 2SC789 search seems to agree - TO-220 NPN, fT
minimum 3 MHz, 60 volts, 4 amps, 30 watts dissipation, Vce(sat) max of
1.3 volts at a 3-ampere collector current.

I'm not sure about the -R suffix... this might indicate an Hfe gain
range/binning for the part in question? The 2SC789 entry in the
catalog says that Hfe ranages from a minimum of 40 to a maximum of
240, with an annotation "Hfe groups available", so I'd guess that the
-R might be a group designation.

Is there a 2SA489 nearby in the circuit? Since that's a PNP listed as
being complementary to the 2SC789, it might be part of a complementary
pair with the failed transistor. If so, you might be able to measure
its Hfe and deduce the required gain of the 2SC789 (or substitute).

--
Dave Platt <dplatt@radagast.org> AE6EO
Friends of Jade Warrior home page: http://www.radagast.org/jade-warrior
I do _not_ wish to receive unsolicited commercial email, and I will
boycott any company which has the gall to send me such ads!
 
On Wed, 24 Dec 2008 09:38:57 -0800, dplatt@radagast.org (Dave Platt)
wrote:

Not having success find anything on a Toshiba 2SC789-R transistor. It's part
of the pre-amp circuit from a vintage Pioneer Quad Stereo Receiver. Any
ideas ?

Hmmm. Doing a web search on 2SC789 (without the suffix) leads to a
few possibilities, including a Japanese transistor cross-reference
list. This list indicates that the 2SC789 crosses to 2SD313 and
2SD526, both of which are low-frequency epitaxial NPN power
transistors in TO-220 cases. 60-80 volts, 4 amps, fT around 8 MHz.

Another hit on the 2SC789 search seems to agree - TO-220 NPN, fT
minimum 3 MHz, 60 volts, 4 amps, 30 watts dissipation, Vce(sat) max of
1.3 volts at a 3-ampere collector current.

I'm not sure about the -R suffix... this might indicate an Hfe gain
range/binning for the part in question? The 2SC789 entry in the
catalog says that Hfe ranages from a minimum of 40 to a maximum of
240, with an annotation "Hfe groups available", so I'd guess that the
-R might be a group designation.
Click to expand...
The R gain grouping is the lowest of the three sorted groupings
originally marketed for this part by Toshiba. 40-80 at 500mA Ic.

RL
 
On Wed, 24 Dec 2008 09:08:42 -0500, "Jeff D" <djdieterle@hughes.net>
put finger to keyboard and composed:

Not having success find anything on a Toshiba 2SC789-R transistor. It's part
of the pre-amp circuit from a vintage Pioneer Quad Stereo Receiver. Any
ideas ?
Click to expand...
My Towers International Transistor Selector suggests that the suffix
represents an Hfe grade.

Package Vcb Vce Veb Ic(max) Tj(max) Ptot Ft(min) Manuf
-----------------------------------------------------------
NS TOP66 60V 60V 5V 4A 150C 30WC 3M Toshiba


Hfe (@ bias = 500mA)
--------------------------------
2SC789 40/240
2SC789/R 40/80
2SC789/Y 120MN
2SC789/O 70/140

Suggested equivalents are BD589 and 2N6123.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
 
Thanks, Ill try the 2N6123


"Franc Zabkar" <fzabkar@iinternode.on.net> wrote in message
news:mun7l4tki54q4uigrjjogjdktbap77l591@4ax.com...
On Wed, 24 Dec 2008 09:08:42 -0500, "Jeff D" <djdieterle@hughes.net
put finger to keyboard and composed:

Not having success find anything on a Toshiba 2SC789-R transistor. It's
part
of the pre-amp circuit from a vintage Pioneer Quad Stereo Receiver. Any
ideas ?

My Towers International Transistor Selector suggests that the suffix
represents an Hfe grade.

Package Vcb Vce Veb Ic(max) Tj(max) Ptot Ft(min) Manuf
-----------------------------------------------------------
NS TOP66 60V 60V 5V 4A 150C 30WC 3M Toshiba


Hfe (@ bias = 500mA)
--------------------------------
2SC789 40/240
2SC789/R 40/80
2SC789/Y 120MN
2SC789/O 70/140

Suggested equivalents are BD589 and 2N6123.

- Franc Zabkar
--
Please remove one 'i' from my address when replying by email.
Click to expand...
 
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