2N4871 Unijunction Transistor (UJT) TO-92
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Prices updated: 13 Oct 2026
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About this product
The 2N4871 is a unijunction transistor (UJT) in a TO-92 plastic package. It is used in relaxation oscillators, timing circuits and for triggering thyristors such as SCRs in simple control and pulse-generator circuits. It is a classic component for learning how UJT oscillators work.
Specifications
- Type
- Unijunction transistor (UJT)
- Package
- TO-92 plastic
- Typical use
- Relaxation oscillator, timing, SCR triggering
Frequently asked questions
What are the terminals of the 2N4871?
The three terminals are the emitter, base 1 and base 2. The pin order of a TO-92 package can vary between manufacturers, so confirm the pinout in the datasheet before wiring.
How is a UJT used in a basic oscillator circuit?
A UJT is typically used with an RC timing network connected to the emitter. When the emitter voltage reaches the firing point, the device switches on and discharges the capacitor, producing a repeating pulse at its base output.
