2SC945, NPN General-Purpose Transistor, TO-92

The 2SC945 is a widely used low-power NPN transistor suitable for low-noise general-purpose amplification and switching. It’s especially common in audio preamps, signal processing, and small signal control circuits. It offers stable performance and excellent gain characteristics in compact TO-92 packaging.

Key Features:

• Low Noise: Optimized for audio-frequency amplification applications.
• Moderate Voltage Rating: Collector-emitter voltage up to 50V.
• Compact TO-92 Package: Ideal for through-hole general-purpose electronics.
• High Gain: DC current gain (h_FE) typically ranges from 120 to 700 depending on classification.
• Low Saturation Voltage: V_CE(sat) ~0.3V @ 100 mA.
• Complementary Pair: Often paired with 2SA733 (PNP) in push-pull circuits.

Additional Specifications:

• Type: NPN
• Max Voltage: 50V
• Max Current: 100Ma