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MMBT2222A NPN Transistor

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by Ray

General-purpose 40 V NPN bipolar transistor in SOT-23, the surface-mount 2N2222A.

transistorbjtnpnswitchingsot-23diodes
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MMBT2222A

Diodes Incorporated · Bipolar Transistor (BJT) · SOT-23

The MMBT2222A is the SOT-23 surface-mount version of the 2N2222A general-purpose NPN transistor. It handles up to 40 V and 600 mA continuous collector current, making it a common choice for low-power switching, relay and LED driving, and small-signal amplification.

Pinout

Pin Name Type Function
1 B input Base terminal of the NPN BJT. Drives collector current via hFE (typ 100-300 at IC=150mA, VCE=10V); VBE(sat) ~ 1.2V max at IC=150mA/IB=15mA. Absolute max VEBO = 6.0V, IBM = 200mA.
2 E passive Emitter terminal of the NPN BJT. Common return for collector and base currents. Absolute max VEBO = 6.0V. In a typical NPN switching/amplifier configuration this pin is tied to (or referenced from) the low-side supply.
3 C passive Collector terminal of the NPN BJT. Absolute max VCBO = 75V, VCEO = 40V; IC = 600mA continuous, ICM = 800mA peak. VCE(sat) < 0.3V at IC = 150mA, IB = 15mA.

Key specifications

Parameter Value
Type NPN bipolar transistor
Collector-emitter voltage (VCEO) 40 V
Collector current (IC) 600 mA continuous
hFE 100 to 300 at IC = 150 mA
Transition frequency (fT) 300 MHz min
Power dissipation 350 mW
Operating temperature -55 C to 150 C

Ordering variants

Same part, different packaging or reel option.

  • MMBT2222A-7-F
  • MMBT2222A-13-F

CAD (KiCad official)

  • Symbol: mmbt2222a.kicad_sym
  • Footprint: mmbt2222a.kicad_mod
  • 3D model: SOT-23 body from KiCad Package_TO_SOT_SMD/SOT-23.

Provenance

Data extracted from the manufacturer datasheet, not a distributor listing:

  • Datasheet: Diodes Incorporated datasheet (7 pp, sha256 02047f112848a0d2, retrieved 2026-08-17, tier: manufacturer)
  • Extractor: ds2sf (Claude). Every pin and dimension is cited to a datasheet page; it refuses to fabricate.
  • CAD: KiCad official libraries (CC-BY-SA 4.0).

Datasheet PDF