Product Overview
Motorola MPS2222A Silicon NPN Switching Transistor
Condition
New old stock (NOS). Unused inventory. Leads are straight, untrimmed, and clean with no solder or tinning. Front face markings legible: •MPS2 222A over the Motorola emblem and code 642.
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Product Overview
The Motorola MPS2222A is an NPN silicon bipolar junction transistor designed for high-speed switching and small-signal amplification. Housed in a standard through-hole TO-92 plastic package, it delivers a continuous collector current up to 600 mA with a 40 V collector-emitter breakdown rating. Widely used across digital and analog circuitry, it handles tasks from driving small relays and indicator LEDs to serving as an oscillator stage or logic level translator.
Key Features
- Collector-Emitter breakdown voltage (VCEO): 40 Vdc
- Continuous collector current (IC): 600 mAdc
- Total device dissipation (PD): 625 mW at 25°C
- Transition frequency (fT): 300 MHz
- Pin layout (flat face forward, left to right): Emitter, Base, Collector (E-B-C)
- Package type: 3-lead through-hole TO-92
Applications
- Driving 5V or 12V miniature relay coils and indicator LEDs directly from microcontroller GPIO pins.
- Level shifting between mixed-voltage logic boards on breadboards or custom prototype shields.
- Restoring legacy analog synthesizer trigger stages and oscillator pulse shapers.
- Benchtop circuit prototyping for DIY audio preamplifiers and low-power RF switching projects.
Frequently Asked Questions
What is the pinout configuration for this transistor?
Viewing the flat marked face with leads pointing downward, the leads from left to right are Pin 1 (Emitter), Pin 2 (Base), and Pin 3 (Collector).
Can this part be used in place of a 2N2222A or PN2222A?
The MPS2222A shares the electrical ratings of the 2222A family in a plastic TO-92 package. Confirm your circuit's required lead layout and ratings prior to installation.
Why buy exact quantities of this transistor instead of a bulk surplus lot?
You get the specific Motorola components you need without paying for a bulk lot of unknown parts or sitting on excess bench inventory. More pieces cost less each, and the price-break table on this page shows what each quantity costs. Orders ship for an $8 flat rate, qualify for free shipping at $28, and depart our Idaho warehouse the same or next business day.
The 2222A has flipped relays, driven LEDs, and saved breadboard builds across five decades of bench experiments. Plug this one in, bias the base, and watch the circuit click to life.
