C945 Transistor Pinout, Equivalent, Uses, Features & Applications

C945 transistor pinout, equivalent, uses, features & applications, details on how and where to use this transistor, how to get best long term durability…


C945 Transistor Pinout, Equivalent, Uses, Features & Applications



Features / technical specifications:

  • Package Type: TO-92
  • Transistor Type: NPN
  • Max Collector Current(IC): 150mA
  • Max Collector-Emitter Voltage (VCE): 50V
  • Max Collector-Base Voltage (VCB): 60V
  • Max Emitter-Base Voltage (VEBO): 5V
  • Max Collector Dissipation (Pc): 400 miliWatt
  • Max Transition Frequency (fT): 200 MHz
  • Minimum & Maximum DC Current Gain (hFE): 70 – 700
  • Max Storage & Operating temperature Should Be: -55 to +150 Centigrade


PNP Complementary:

PNP Complementary of C945 is A733


Replacement and Equivalent:

2N2222, 2N3904, 2SC1815, 2SC3198 (Pin configuration of SOME transistors are different from C945, check pin configuration before replacing in a circuit)


C945 Transistor Explained / Description:

C945 is a general purpose NPN transistor used in wide variety of commercial and educational electronic circuits. It is manufactured in TO-93 package, the max load this transistor can drive is around 150mA or 0.15A that is enough to operate many devices in a circuit for example LEDs, Relays, ICs, transistors and other parts of a circuit. The saturation voltage of the transistor is only 0.3V which is also a good feature of this transistor. Moreover the transistor is also low noise device, and has a good DC current gain that is 70 to 700.


Where We Can Use it & How to Use:

As discussed above the transistor has a good DC current gain and low noise type due to which it is ideal to use in audio preamplifier & audio amplifier circuits stages or amplification of other signals in electronic circuits. The saturation voltage of most BJT transistors are 0.6V but the C945 has only 0.3V therefore it can perform well in low voltage circuits or in any circuit where low base voltage is available and other BJT transistors are not saturating. It can also be used in RF circuits under 200MHz frequency.



Sensor Circuits

Audio Preamplifiers

Audio Amplifier Stages

Switching Loads under 150mA

Darlington Pairs

RF Circuits


How to Safely Long Run in a Circuit:

To run this transistor safely in a circuit it is suggested to not operate it voltage over 50V, always connect the pins correctly and do not provide it load above 150mA because the max load this transistor can handle is 150mA. For best performance we suggest to not touch the max load limit always stay under it. Do not expose it in temperature above +150 centigrade and below -55 centigrade and always use a suitable base resistor.

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