C945 Bipolar NPN Amplifier Transistor

Description

C945 is an age old Japanese Bipolar audio frequency NPN transistor. It has a decent gain value (hfe) of maximum 700 and is highly linear. Hence was widely used in amplifier applications for pre-amplifying purpose, in high frequency circuits. Also used as oscillators with its complementary A733 PNP transistor.

As a switch its easily  controlled by a MCU/MPU since it has a base voltage of only 5V. It switches loads upto 50V but has a very low collector current rating of only 150 mA. Therefore, not recommended to be used as a switch.

Features of C945 include;

• It is a Japanese High frequency amplifier NPN Transistor
• Has a Current Gain (hFE) of 70 to 700 (high linearity)
• Also has a Collector Current of 150 mA
• Collector-Emitter Voltage of 50 V
• It also has a Collector-Base Voltage of 60V
• Emitter-Base Voltage of 5V
• Transition Frequency is 150 MHz
• Available only in To-92 Package

Applications of C945 Bipolar NPN Amplifier Transistor

• Used as Low current switches
• Also used as Pre-amplifiers
• In addition in H-bridge circuits for low power motors
• Last but not least, in Audio frequency amplifier circuits
• Lastly, in Oscillator circuits

Complementary PNP for C945

A733

Alternative 

BC546, 2SC1815, KSC945C

Datasheet