NEC 2SA539 transistor replacement/equivalent?

[kouiky]

Hi DIYers,

I’m looking for a replacement for the NEC 2SA539 PNP channel transistor, TO-92 package. The pinout of a replacement won’t matter, I can bend legs. The KSA539 is unavailable, much like the original.

The original specs are as follows:

Maximum Ratings:
Collector to Base Voltage (V CBO) -60V
Emitter to Base Voltage (V EBO) -5V
Collector Current -200mA
Dissipation 250mW

Characteristics (at conditions: V CE -1V, IE -50mA)
Current gain hFE 80
fT 200Hz
Cob 8.5pF
hie 20 Ohms
Collector Cutoff Current I CBO, max 0.2uA, V CB -30V

 

[NareshBrd]

A1015
Or see part distributor websites.
Where is it used?

 

[kouiky]

Input stage of an amplifier circa the mid 1970’s. Two are used and arranged as a differential pair. They set the output DC offset as well. If a schematic would help in determining the suitability of a replacement, I can post it.

 

[kouiky]

Here we go, the two 2SA539 at the left side of the schematic are the first active devices in the amplifier stage.