2SA1943 PNP Power Transistor

The 2SA1943 is a high-power PNP bipolar junction transistor (BJT), originally manufactured by Toshiba, widely used in high-fidelity audio amplifier output stages. It is commonly paired with its complementary NPN transistor, the 2SC5200, in push-pull amplifier configurations.

Key Specifications

According to various datasheets from sources like Utmel and Toshiba, the key specifications of the 2SA1943 include:

Transistor Type: PNP

Collector-Emitter Voltage (VCEO): -230 V

Collector Current (IC): -15 A

Power Dissipation (PC): 150 W (at Tc = 25°C)

DC Current Gain (hFE): 55 to 160 (at VCE = -5 V, IC = -1 A)

Transition Frequency (fT): 30 MHz

Package Type: TO-264 or TO-3PL

Common Applications

The 2SA1943 is primarily designed for high-performance audio applications due to its excellent gain linearity and low total harmonic distortion.

High-Fidelity Audio Amplifiers: It is recommended for 100-W high-fidelity audio frequency amplifier output stages.

Push-Pull Circuits: It is frequently used with the NPN 2SC5200 transistor in push-pull configurations to minimize distortion and enhance audio clarity.

General Purpose Power Amplifiers: Its robust nature makes it suitable for various demanding power amplification scenarios.