MMBT2222A NPN Transistor

MMBT2222A Transistor
MMBT2222A Transistor
MMBT2222A Pinout
MMBT2222A Transistor
MMBT2222A Pinout

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The MMBT2222A is the SMD (SOT-23) version of the popular 2N2222A Transistor. It has a collector current of 0.6A and Collector Emitter voltage of 40V. This Transistor is commonly used in low power switching devices where space is a constraint.


Pin Configuration

Pin Number

Pin Name




Current flows out through Emitter



Controls the biasing of the Transistor



Current flows in through Collector



  • Bi-Polar small signal NPN Transistor
  • DC Current Gain (hFE) is 100 to 300
  • Continuous Collector current (IC) is 600mA
  • Emitter Base Voltage (VBE) is 6V
  • Collector Emitter Voltage (VCE) is 40V
  • Rise and Fall time is 25ns and 60ns respectively
  • Available in To-92 Package

Note: Complete Technical Details can be found at the datasheet given at the end of this page.


Through Hole Equivalent for MMBT2222A



Complementary PNP Transistor



Other NPN Transistors

BC549, BC636, BC639, 2N2222 TO-92, 2N2222 TO-18, 2N2369, 2N3055, 2N3906, 2SC5200


MMBT2222A Brief Description

BT2222A is a NPN transistor hence the collector and emitter will be left open (Reverse biased) when the base pin is held at ground and will be closed (Forward biased) when a signal is provided to base pin. BT222A has a maximum gain value of 300; this value determines the amplification capacity of the transistor. The maximum amount of current that could flow through the Collector pin is 600mA, hence we cannot connect loads that consume more than 600mA of continuous current and 800mA of peak current. To bias a transistor we have to supply current to base pin, this current (IB) should be limited to 5mA with a base emitter voltage of 6V. The maximum voltage across the load that is getting switched is 40V.

This transistor is the SMD equivalent for the popular 2N2222A transistor, which his commonly used in many switching circuits to control low current loads like pumps, solenoids, LEDs etc.. The transistor also has an equivalent PNP transistor called MMBT2907A, both combined together can be used to form push pull circuits or Class B amplifier Designs.



  • Driver Modules like Relay Driver, LED driver etc...
  • Switching loads upto 600mA
  • Motor speed control
  • Inverter and Rectifier circuits
  • Darlington Pair Designs



The BT3904 is an SMD Transistor and is available in SOT-23 Package. If you are looking for a through hole type then consider 2N2222A. The dimension of the SOT-23 Package is shown below.

 MMBT2222A Transistor 2D-Model

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