2SA1943 is a commonly used high power audio transistor. This is a PNP type of transistor comes in TO-246 Package. The transistor can handle 230v collector emitter voltage and 15A collector current. In this article I’m sharing the information’s about 2SA1943 Pinout, equivalent and its specifications.
What is 2SA1943 Transistor?
it is a PNP type high power transistor using in high fidelity audio amplifier circuits. The transistor can handle around 230V DC so it is famous in high voltage needed amplifier circuits. With complementary pair of transistor can be used to build a push pull amplifier configuration. This transistor is mainly manufactured by Toshiba. But in the market you can find the TTA1943 transistor. Because the TTA1943 is the newest version of transistor with low cost and replaced the old 2sa1943.
2SA1943 Transistor Pinout
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2SA1943 Power Transistors – Pack of 2
✔ Type Designator: 2SA1947, Transition Frequency (ft): 100 MHz
, Maximum Collector Current |Ic max|: 1 A
Max. Operating Junction Temperature (Tj): 150 °C
To check the pinout of this transistor, you need to hold the transistor numbering is facing to you and the metal side at the back and pins are pointing downward. Then count the transistors pins from left to right as PIN1, Pin2 and Pin 3. Pin 1 is Base, Pin 2 is collector and Pin 3 is Emitter. To quick reference I gives you the pinout configuration in a table below.
Pinout Configuration
| Pin Number | Name |
|---|---|
| 1 | Base (B) |
| 2 | Collector (C) |
| 3 | Emitter (E) |
Specifications
- Type: PNP
- Collector-Emitter Voltage is -230 V
- Collector continuous Current is -15 A
- Power Dissipation is 150W
- DC Current Gain as hfe is 55 to 160
- Transition Frequency is around 30 MHz
- Package Type available in TO-3PL or TO-264
Complementary Pair
- 2SC5200 NPN transistor is the complementary pair for 2SA1943 PNP transistor.
Equivalent or Alternatives
Difficult to find the 2SA1943 you can use the alternatives as MJW1302A by ON semiconductor, 2SA1962 by Toshiba or FJL4215 by Fairchild/ON Semi and new version of TTA1943. Always remember the pinout configuration and voltage, current ratings before replacing with other alternative transistors.
How to Identify the Original Transistor
- Due to the popularity of this transistor, many clones and duplicates are available. To avoid buying this consider about its weight about 9.75gm and thicker copper heat dissipation metal tab at the bottom.
- In capacitance testing value should be in between 3 to9 nF and fakes will exceed 10nF.
- If the DC current gain is higher than the standard value in the datasheet means, chance of fake transistor.
Common Applications
- Used in Power audio amplifier stage.
- Push pull circuits.
- High Power Switching circuits.
Related Product
2SC5200 2SA1943 PCB
Ready made PCB to build your own Amplifier. 300 watt max RMS output,suitable for Subwoofer and stereo audio amps.
