2SA1943 PNP Power Transistor, TO-264 (Toshiba)
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Prices updated: 13 Oct 2026
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About this product
The 2SA1943 is a PNP silicon power transistor from Toshiba in a TO-264 package. It is widely used in the output stage of high-fidelity audio amplifiers and is commonly paired with a complementary NPN device such as the 2SC5200. It is recommended for 100 W Hi-Fi audio output stages.
Specifications
- Type
- PNP power transistor
- Package
- TO-264
- Manufacturer
- Toshiba
- Recommended use
- Hi-Fi audio amplifier output stage, 100 W
Frequently asked questions
Can I use it in place of an NPN transistor?
No. The 2SA1943 is a PNP device and needs opposite polarity to NPN types. In a complementary output stage it is paired with an NPN device such as the 2SC5200.
Does it need a heatsink?
Yes, in audio output stage use. TO-264 power devices dissipate significant heat, so mount them on an adequate heatsink. The tab is typically connected to the collector, so use insulating hardware if the heatsink is grounded. Check the datasheet for pinout and ratings before wiring.
