Product Overview
Motorola MPS2222A NPN Bipolar Junction Transistor for Switching and Amplification
Condition
Unused new old stock (NOS). Sourced from electronics distributor inventory consolidation. Straight through-hole leads with legible body markings: MPS2 222A with Motorola emblem and date code 538.
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Product Overview
Motorola MPS2222A is a through-hole NPN silicon bipolar junction transistor engineered for general-purpose switching and linear amplification. Built in a TO-92 package, it delivers up to 600mA continuous collector current with a 40V breakdown rating, bridging small-signal logic circuits and medium-current DC loads.
Key Features
- NPN silicon bipolar junction transistor (BJT)
- TO-92 package with three straight through-hole leads
- 40V collector-emitter breakdown voltage (VCEO)
- 75V collector-base breakdown voltage (VCBO)
- 600mA maximum continuous collector current
- 625mW total device power dissipation at 25C
- DC current gain (hFE) of 100 to 300 at 150mA collector current
- 300MHz minimum transition frequency (fT)
Applications
- Driving 5V, 12V, or 24V DC relay coils directly from microcontroller GPIO pins
- Small-signal audio preamplifier stages and intercom equipment repairs
- Prototyping VHF oscillator, buffer, and RF transmitter circuits on breadboard
- Bench repairs replacing degraded general-purpose NPN switching devices in legacy test gear
Frequently Asked Questions
What is the pinout for this TO-92 transistor?
Facing the flat marked front of the package with the leads pointing downward, the leads from left to right are Pin 1 (Emitter), Pin 2 (Base), and Pin 3 (Collector).
Can this transistor directly switch a standard DC relay coil?
Yes. With a 40V collector-emitter rating and 600mA continuous collector current capability, it reliably switches standard 5V, 12V, or 24V DC relay coils operating within those current limits.
Why buy individual transistors here instead of an unverified surplus lot?
You can purchase the exact count needed for a bench repair or prototyping run without taking on a grab-bag lot. More pieces cost less each, and the price-break table on this page shows what each quantity costs. Shipping is an $8 flat rate, free once the order passes $28, and orders ship same or next business day from our Idaho warehouse.
Every bench has a drawer for the 2222 family because it has handled the unglamorous switching jobs since the breadboard era. Drop this one in, bias the base, and let it do what it was built to do.
