Product Overview
Fairchild TIP122 100V 5A Complementary Silicon Darlington Transistor
Condition
Unused new old stock. Through-hole leads are straight with intact factory-style tinning. Markings legible: Fairchild logo, H42, TIP122.
Same or next business day shipping from our Idaho warehouse. Reliable parts since 1999. Honest pricing, no nonsense.
We are here for our customers, with a no-hassle satisfaction guarantee.
Product Overview
Fairchild Semiconductor TIP122 is a monolithic NPN epitaxial Darlington power transistor engineered for general-purpose switching and medium-power linear amplification. Built into a standard TO-220 package with the collector tied directly to the mounting tab, it delivers high DC current gain alongside 100V breakdown and 5A continuous collector current capability.
Key Features
- 100 V collector-emitter sustaining voltage (VCEO(sus))
- 5.0 A continuous collector current rating (8.0 A peak)
- 1000 minimum DC current gain (hFE at 3.0 A, 3.0 V)
- 65 W total device dissipation at 25°C case temperature
- Standard 3-lead TO-220 through-hole package (Pin 1 Base, Pin 2 Collector, Pin 3 Emitter)
Applications
- Driving 12V and 24V DC solenoid valves, relays, and stepper coils directly from low-current microcontroller pins.
- PWM speed regulation for medium-duty DC motors, cooling fans, and robotics actuators on the bench.
- Replacing failed power switching stages in vintage motor drives, power supplies, and industrial controls.
Frequently Asked Questions
What is the pinout configuration on this TO-220 package?
Facing the front marked face with the leads pointing downward, pin 1 is the Base, pin 2 is the Collector, and pin 3 is the Emitter. The metal mounting tab is electrically connected to the center Collector pin.
Can a 5V logic signal drive this transistor directly?
Yes. With a minimum DC current gain of 1000, a logic output providing just a few milliamperes into the base can saturate the collector to drive loads up to several amperes.
What is the complementary PNP transistor for complementary output pairs?
The matching complementary PNP Darlington transistor is the TIP127, offering identical 100V and 5A ratings for push-pull driver circuits.
Nothing tames an unruly inductive load quite like a trusty Darlington in a TO-220 tab. Fasten it to your heatsink, feed it a whisper of base current, and let the heavy switching begin.
