2SC1943 Pinout, Features, Equivalent, Applications and More

Today we are going to discuss about 2SC1943 pinout, features, equivalent, applications, and details about how and where to use this transistor. It is the PNP complementary of the 2SA5200 audio power amplifier transistor that has been discussed before, so let’s move on to the article.


2SC1943 Pinout, Features, Equivalent, Applications


Features / Technical Specifications:

  • Package Type: TO-264
  • Transistor Type: PNP
  • Max Collector Current(IC): –15A
  • Max Collector-Emitter Voltage (VCE): –230V
  • Max Collector-Base Voltage (VCB): –230V
  • Max Emitter-Base Voltage (VEBO): –5V
  • Max Collector Dissipation (Pc): 150 Watt
  • Minimum & Maximum DC Current Gain (hFE): 55 To 160
  • Max Storage & Operating temperature: -55 to +150 Centigrade


NPN Complementary:

NPN Complementary of 2SA1943 is 2SC5200


Replacement and Equivalent:

2SA2151A, 2STA2121, 2SA1986, 2SA1962, FJA4213, FJL4215, KTA1943, KTA1962.


2SA1943 Transistor Explained / Description:

2SA1943 is PNP transistor manufactured in TO-264 package. It is one of the popular transistor primarily made for audio amplification purposes. It performs very well over the wide range of audio frequencies from 5Hz to 100kHz and also is very low noise and low distortion type due to which it provides clear and similar sound at the output with added amplification and bass boost.

The maximum output current or collection current of the transistor is -15A and the maximum collector to emitter voltage is -230V. The maximum collector dissipation is 150 Watt.

The transistor is available from Toshiba few years back with the part number 2SA1943 but now it is replaced with TTA1943 but you can still find 2SA1943 from some well-known suppliers who have stock of old transistors. However, if you can’t find them then you can also use a Chinese copy of it which works almost the same or you can also use their alternative transistors mentioned above.


Where We Can Use it & How to Use:

As discussed above, the 2SA1943 is primarily designed for high-power audio amplification purposes and can be used in the output stage of high-power audio amplifiers. It is often used with its NPN complementary 2SC5200 to build high-power audio amplifiers.

Moreover, it can also be used for switching purposes and can drive load of up to -15A.



Audio Power Amplifier Circuits

Different Audio Amplifier Stages

Switching Loads

High Voltage Applications


Follow These Tips to Make This Transistor Last Longer:

To achieve long-life performance with 2SA1943 do not use it at its absolute maximum rating and stay below 20%. The maximum collector current is -15A so do not drive load of more than -12A. The maximum collector to emitter voltage is -230V so do not drive load of more than -180V. As mentioned, this is a high-power transistor, so a proper heat sink is essential. The heat sink is also connected to the transistor’s collector so it should be kept separate from other connections in the circuit and always store and operate the transistor at temperatures above -55 degrees Celsius and below +150 degrees Celsius.



To download the datasheet just copy and paste the below link in your browser.


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