TIP29 NPN Power Transistor 40V 1A TO-220
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Prices updated: 13 Oct 2026
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About this product
TIP29 is a general-purpose NPN power bipolar transistor in a TO-220 package. It is used as a switch or amplifier to drive loads such as relays, LEDs, small motors, or to boost the current available from low-power logic outputs.
Specifications
- Transistor type
- NPN power BJT
- Package
- TO-220
- Collector-emitter voltage (VCEO)
- 40 V
- Collector current (IC)
- 1 A
- Power dissipation (Ptot)
- 30 W
- Mounting
- Through-hole
Frequently asked questions
What is the pinout of TIP29?
With the flat face toward you and the leads pointing down, the pins are Base, Collector and Emitter from left to right. Confirm against the datasheet for your exact part, since packages can vary by manufacturer.
Can a microcontroller pin drive it directly to switch a relay?
A microcontroller pin can drive the base through a resistor, but the TIP29 needs a fair amount of base current to fully switch on at 1 A. For a relay or motor, add a flyback diode across the inductive load and check the base resistor value for your current.
