2SC945 Bipolar NPN Transistor is an age-old Japanese Bipolar audio frequency NPN transistor. 2SC945 Bipolar NPN Transistor has a decent gain value (hfe) of maximum 700 and is highly linear. Hence it was widely used in amplifier applications for pre-amplifying purpose, in high-frequency circuits. It is also used as oscillators with is complementary A733 PNP transistor.

When used as a switch it can easily be 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 the only 150mA so this transistor is not really a good choice to be used as a switch. A better alternative for switching applications will be 2N2222.
However, this transistor is outdated and will not be easily available if you are in Asian or European countries. In that case, you can try the 2N3904 transistor from ON semiconductors, but do remember to deal with the pinouts as mentioned in the warning section above.


  1. 2sc925 well known as C945 NPN transistor.
  2. Max Voltage Collector Emmiter=50 V
  3. Max Collector current=150 mA
  4. Collector power dissipation: 400 mW
  5. Japanese High-frequency amplifier NPN Transistor
  6. Current Gain (hFE) is 70 to 700 (high linearity)
  7. Continuous Collector current (IC) is 150mA
  8. Collector-Emitter voltage (VCEO) is 50 V
  9. Collector-Base voltage (VCB0) is 60V
  10. Emitter Base Voltage (VBE0) is 5V
  11. Transition Frequency is 150MHz


Type of transistor NPN
Polarisation bipolar
Collector-emitter voltage 60V
Collector current 100mA
Power 250mW
Case TO92
Mounting THT
Frequency 250MHz

Pin Description:

Number  Name Description
1 Emitter Current Drains out through emitter, normally connected to ground
2 Collector Current flows in through collector, normally connected to load
3 Base Controls the biasing of the transistor, Used to turn ON or OFF the transistor


  1. Low current switches
  2. Pre-amplifiers
  3. H-bridge circuits for low power motors
  4. Audio frequency amplifier circuits
  5. Oscillator circuits

Package Includes:

1 x 2SC945 Bipolar NPN Transistor

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Additional information

Weight 0.1 kg


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