2SA1943 is a high‑power PNP bipolar junction transistor (BJT) used especially in audio amplifiers and power electronics. It’s a classic output device in high‑fidelity amplifier designs and pairs with high‑power NPN parts like 2SC5200 in push‑pull stages.

🔋 Key Specifications

• Transistor Type: PNP (silicon BJT)

• Package: TO‑3P / TO‑3PL (large power package)

• Collector–Emitter Voltage: ~–230 V (min) (some datasheets list up to –250 V)

• Collector Current (Iᴄ): ~–15 A continuous (up to ~–17 A on some variants)

• Power Dissipation: ~150 W (with proper heatsinking)

• DC Current Gain (hFE): ~55–160 depending on test conditions

• Transition Frequency: ~30 MHz (moderate speed)

• Voltage Ratings:
  • Collector‑Base: ~–230 V
  • Emitter‑Base: ~–5 V