Bipolar (BJT) Transistor NPN 40V 600 mA 300MHz 300 mW Surface Mount SOT-23-3 (TO-236)
The MMBT2222ALT3G is a NPN general-purpose bipolar junction transistor (BJT) manufactured by onsemi, designed in a SOT-23 surface-mount package. It is the SMD version of the well-known 2N2222A transistor family, used for switching and signal amplification in compact electronic circuits.
It is widely used in industrial, automotive (AEC-Q101 qualified variants), and general embedded systems due to its reliability, small size, and good electrical performance.
Key Features
NPN General-Purpose Transistor
Suitable for switching and low-power amplification
Collector-Emitter Voltage (Vceo)
Up to 40 V
Collector Current
Up to 600 mA
Power Dissipation
Around 225–300 mW (depending on package conditions)
High Frequency Performance
Transition frequency up to ~300 MHz
DC Current Gain (hFE)
Typically ~100 at moderate currents
Low Saturation Voltage
Efficient switching performance for digital circuits
SOT-23 Surface-Mount Package
Compact footprint for modern PCB designs
Wide Temperature Range
Typically -55°C to +150°C
RoHS / Lead-Free Compliant
Environmentally compliant manufacturing
Typical Applications
LED switching circuits
Relay driver stages
MCU signal interfacing (Arduino, ESP32, etc.)
Small motor drivers
General signal amplification
Automotive and industrial control circuits
Important Note
MMBT2222ALT3G = SMD version (SOT-23)
Equivalent to 2N2222A (TO-92 through-hole version) in function, but not in physical package.
2N2222A SOT-23
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