The Toshiba A1943 is a silicon PNP triple-diffused power transistor ideal for high-fidelity audio frequency amplifier output stages. It is specifically engineered to complement the NPN C5200, making it a popular choice for high-performance push-pull audio amplifiers.
With a collector-emitter voltage rating of −230V and a collector current rating of −15A, this transistor is well-suited for handling large audio loads with stability and minimal distortion. It offers high gain, fast switching, and low saturation voltage for clean signal amplification.
The 2SA1943 comes in a TO-264 package for easy heat sink mounting and optimal thermal management. It is frequently used in 100W+ audio amplifier designs where precision, efficiency, and durability are required.
Whether you’re building a new amplifier or replacing old output transistors, the A1943 offers a trusted solution for superior audio clarity and long-term reliability.
Key Features of the A1943 Transistor
- High collector-emitter voltage: −230V
- Continuous collector current: −15A
- High power dissipation: 150W
- A DC Current gain of 35 to 160
- Fast switching with a low saturation voltage
- Triple-diffused silicon construction
- TO-264 package
- Complementary to 2SC5200
A1943 Transistor Technical Specification Table
| Parameter | Value |
| Transistor Type | PNP |
| V<sub>CEO</sub> (Max) | −230V |
| I<sub>C</sub> (Max) | −15A |
| P<sub>C</sub> (Total Dissipation) | 150W |
| V<sub>EB</sub> (Max) | −5V |
| h<sub>FE</sub> (DC Gain) | 35 – 160 |
| V<sub>CE(sat)</sub> | −1.5V (typical) |
| f<sub>T</sub> (Transition Frequency) | 30 MHz |
| Capacitance (Cob) | 360 pF |
| Package Type | TO-264 |
| Operating Temperature | −55°C to +150°C |
Applications of the 2SA1943
- High-fidelity audio amplifier output stages
- Class AB push-pull amplifier designs
- Voltage regulator circuits
- High-current linear power supplies
What’s in the package and recommended usage tips
- 1 × 2SA1943 PNP Power Transistor (Toshiba Original)
- Pair with 2SC5200 NPN transistor for Class AB audio amp designs.
- Mount on a heat sink with thermal paste for cooling efficiency.
- Ensure proper biasing and thermal tracking in stereo amplifier circuits.
- Use in parallel for higher output power applications (with emitter resistors).
A1943 PDF Datasheet
The link ahead contains the PDF datasheet of the A1943 transistors. Click to view and download the datasheet
2SA1943 Pinout Image and Pin Configuration Table
| Pin | Name | Description |
| 1 | Base (B) | Control input |
| 2 | Collector (C) | Power output to load |
| 3 | Emitter (E) | Ground/Return current |
2SA1943 Sample Circuit/Schematic Diagram
(Typical Class AB amplifier schematic using 2SA1943 + 2SC5200)
(Refer to amplifier design references or the datasheet application notes.)
A1943 Transistor Equivalents or Variants
- 2STSA1943 (STMicroelectronics equivalent)
- MJL1302A (ON Semiconductor equivalent)
- TIP36C (lower-rated alternative)
- NTE264 (commercial replacement)
Why We Recommend It
The 2SA1943 remains one of the most trusted PNP transistors in audio amplifier design, especially when paired with the 2SC5200. Its performance, stability, and manufacturer pedigree make it a go-to part for high-power audio applications.
Customer Reviews
⭐️⭐️⭐️⭐️⭐️ – “Perfect match with 2SC5200. Amazing audio clarity in my DIY amp!”
⭐️⭐️⭐️⭐️ – “Genuine Toshiba part. Works great. Dukatronic never disappoints.”
Why Buy the A1943 Transistor from Dukatronic Kenya
- 100% authentic Toshiba components
- Same-day dispatch within Kenya
- Trusted supplier for audio DIYers and repair techs
- Great prices and technical support
Build Crystal-Clear Audio Circuits!
Unleash your audio amplifier’s true potential with the 2SA1943 from Toshiba. Whether for upgrades or new builds, it delivers power and precision every time.
👉 Order now from Dukatronic for fast and reliable delivery across Kenya!
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