TTA1943 High Power Transistor PNP (15A-250V) New Version From (2SA1943)

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The TTA1943 from Toshiba is a through hole PNP silicon epitaxial transistor in TO-3 package. This device is commonly used for power amplification.
  • Collector to emitter voltage (Vce) is -230V
  • Collector current (Ic) is -15A
  • Power dissipation (Pd) is 150W
  • Collector to emitter saturation voltage of -3V at -8A collector current
  • DC current gain (hFE) of 80 at -1A collector current
  • Operating junction temperature range from 150°C


TTA1943 VS 2SA1943: Differences(TTA1943 better?)

TTA1943 PNP power Transistor is the newer and better version of the famous 2SA1943 power transistor. This means that it has replaced, in quality, a much more expensive power transistor found in electronic devices like televisions and audio amplifiers.

It comes only in TO-3P packages whereas 2SA1943 comes in TO-3P and TO-264 packages.

While their specs seem similar on paper, laboratory tests on TT transistors showed outstanding endurance levels – these ones can withstand extreme temperatures like heat waves. The TTA1943 transistor withstood endurance tests at high temperatures exceeding the maximum junction temperature quoted by Toshiba’s specifications

First released in 2011 by TOSHIBA, aimed at replacing 2SA1943 is cheaper and superior. Hence, should be the first choice between the two.

What is TTA1943 Transistor?

TTA1943 is a PNP power transistor used in Audio frequency amplifiers and High power audio circuits. It was originally manufactured by TOSHIBA in JAPAN and soon became a popular power transistor. Its complementary transistor is the TTS2500 NPN power transistor.

Its maximum ratings are: Collector to Emitter breakdown voltage is -230V, the collector current is -15A, and the current gain is 160.


Note: 2SC5200 is the complementary transistor of 2SA1943 and TTC5200 is the complementary transistor of TTA1943. 


TTA1943 vs 2SA1943: Table

Given below are the differences between TTA1943 and 2SA1943 in the tabular form.

Feature TTA1943 2SA1943
Packaging TO-3P TO-264
Manufacturer Toshiba(Japan) Anyone from Japan & China
DC Current Gain(Min.) 80 55
Collector O/P Capacitance 240 pF 360 pF
Differences between TTS1943 and 2SA1943.

What are TT and 2S?

Only Toshiba holds the right to use TT, meaning no other company can use it. TT simply means devices with the TT abbreviation are diffused and assembled in Japan only. Whereas 2S devices like 2SA1943 can be manufactured in China and Japan.

The new TT devices use the latest Toshiba’s new manufacturing technologies such as diffusion, bonding, thermal conduction, and encapsulation.


TTA1943 vs 2SA1943: Packaging

The older 2SA1943 comes in the TO-264 Package whereas the TTA1943 comes in the TO-3P package.


TTA1943 vs 2SA1943: Specs

The major difference between TTA1943 and 2SA1943 is of DC current gain and collector output capacitance.
The minimum hFE of TTA1943 and 2SA1943 is 80 and 55 respectively.
And COB of TTA1943 and 2SA1943 is 240 pF and 360 pF respectively.

TTA1943 Transistor Pinout

The pinout of both transistors is similar; starting from left: Base, Collector, and Emitter. The pinout of TTA1943 transistor is shown below.


TTA1943 Pinout
TTA1943 Pinout


Pin Name Description
B Base Controls the transistor’s biasing, used to turn it on and off.
C Collector Current out of the transistor through the collector, usually connected to a load.
E Emitter Current flows through the Emitter into the transistor.


Applications of TTA1943 Transistor

Since TTA1943 is just a better replacement for 2SA1943, it can be used in any application where the latter is used. Some of the applications are listed below:


  • Switch-mode power supplies (SMPS)
  • Relays
  • Used with its complementary transistor in a push-pull configuration
  • Power supply
  • Switching a load of high current rating
  • Power amplifiers
  • Inverters
  • Converters
  • Power control circuits
  • DC to AC converters

TTA1943 Transistor Datasheet

The TTA1943 is manufactured only in the TO-3P(L) Package. Hence there is no SMD version of the transistor. Given below is the datasheet of TTA1943.

To download the datasheet of TTA1943, click here.

Where to buy the TTA1943 Transistor?

You may find this transistor in your local electronics store. It’s difficult to find TTA1943 online, but you can use its 2S version instead:

TTA1943 Dimensions

Given below is the 2D diagram of the TTA1943 Power Transistor.

Dimensions of TTA1943 in TO-3P(L) package


TTA1943 TO-3P(L) Package dimensions
TTA1943 TO-3P(L) Package dimensions

TTA1943 vs 2SA1943: Conclusion

TOSHIBA’s TTA1943 is the newer and better version of the 2SA1943 power transistor.
The TT device comes in a TO-3P package, is cheaper than its predecessor, and has superior specs.
It’s definitely the best among the two choices when it comes to deciding whether or not to purchase! The new TT transistors boast laboratory tests showing they can withstand extreme temperatures while being highly durable as well.


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