BC640 Transistor Pinout, Equivalent, Description, Specs & More

BC640 is a TO-92 packaged BJT transistor packed with many good features in its small package. This article contains information about BC640 transistor pinout, equivalent, description, specs, uses and other details.


BC640 Transistor Pinout, Equivalent, Description, Specs & More



Features / technical specifications:

  • Package Type: TO-92
  • Transistor Type:  PNP
  • Max Collector Current(IC): –500mA
  • Max Collector-Emitter Voltage (VCE): –80V
  • Max Collector-Base Voltage (VCB): –80V
  • Max Emitter-Base Voltage (VEBO): –5V
  • Max Collector Dissipation (Pc): 625 miliWatt
  • Max Transition Frequency (fT): 100 MHz
  • Minimum & Maximum DC Current Gain (hFE): 40 – 160
  • Max Storage & Operating temperature Should Be: -55 to +150 Centigrade


NPN Complementary:

NPN Complementary of BC640 is BC639


Replacement and Equivalent:

2N2907, BC538,  BC327, BC328, 2N4403 (Please note that pin configuration of some equivalent transistor show here may be different from BC640, thus it is suggested to check the pin diagram of any number shown here before replacement in your application).


2N2222 Transistor Explained / Description:

BC640 is a PNP BJT transistor available in TO-92 package. The transistor is packed with many good features in its small size that makes it an ideal transistor to use in wide variety of general purpose switching and amplification applications. It can also be replaced with much general purpose TO-92 PNP transistors you use in your applications or designs. The maximum collector current of the transistor is 500mA but some electronic components are also manufacturing with 1A collector current for example NXP. With this collector current capability this transistor can be used in wide variety of switching applications and can switch any load in a circuit upto 500mA to 1A. The max collector-emitter voltage is -80V due to which the user can drive loads that have voltage requirements of upto -80V.

Other than the switching usage this transistor can also be used as an amplifier. The collector dissipation of 625mA with the DC current gain of 40 to 160 also makes this device suitable to use as a separate amplifier to drive a speaker or it can also be used in audio amplifier stages.



Where We Can Use it & How to Use:

You can use BC640 for any general purpose application such as a switch or as an amplifier. When used as a switch it can drive any load that falls under it collector current ratings such as relays, DC motors, LEDs, power transistors etc. Additionally it can also be used at the output of ICs, microcontrollers etc. Moreover it can be used as an amplifier in audio amplification circuits. With the transition frequency of 100MHz this device can also be used RF circuits under 100MHz.



Sensor and Detector Circuits

Audio Amplifier Circuits

Switching Loads under 500mA to 1000mA

Darlington Pairs

Radio Frequency Applications


How to Safely Long Run in a Circuit:

One of the important thing for getting a long service life with any component is to not use it on its maximum ratings. We always suggest using any component atleast 20% below from its maximum ratings. The max collector current of BC640 is 500mA or 1A (As described above), do not drive load of more than 400mA if your transistors collector current is 500mA and do not drive load of more than 800mA if your transistor collector current is 1A. The load voltage should be always under 60V and always store or use this transistor above -55 degree centigrade and below +150 degree centigrade.



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