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Lowest price we've seen: $1.70 on Nov 13 at Electrical.com. Tracked across 2 stores since Nov 13.
The C945 is an old Japanese bipolar audio frequency NPN transistor. It has a decent gain value (hfe) of a maximum of 700 and is highly linear. It has been widely used in amplifier applications for pre-amplification purposes, in high-frequency circuits. It is also used as oscillators with its complementary A733 PNP transistor. When used as a switch, it can be easily controlled by an MCU/MPU since it has a base voltage of only 5V. It can switch loads up to 50V but has a very low collector current rating of only 150mA, so this transistor is not a good choice to use as a switch. 2N2222 will be a better alternative for switching applications. Features NPN Silicon Transistor Low Speed Switching Designed for audio Frequency Amplifier. Complement to the PNP 2SA733Specifications Transistor type: NPN Maximum voltage collector-emitter Uceo: 50 [V] Maximum collector current Ic: 0.1 [A] Power Pc: 0.2 [W] Housing: TO-92 Mounting: Through Hole Maximum voltage collector-base Ucbo: 60 [V] Maximum operating frequency: 450 [MHz] Operating temperature: -55~125 [°C] Noise Figure: 0.8 dB - SKU: LSC13040