2N2646 Unijunction Transistor (UJT) – Classic Trigger Device for Oscillator and Timing Circuits

Description

2N2646 Unijunction Transistor

The transistor is a 3 terminal & 2 junction semiconductor device which is used for switching or amplifying purposes.

Features of 2N2646 General Purpose Transistor:

• Emitter-Base Volt (Veb2): 30V.
• Emitter Current (Iem): 0.05A.
• Power Dissipation (Ptot): 300mW.
• Type: Unijunction.

Notes:

1. Derate 3mW/°C increase in ambient temperature. The total power dissipation (available power to Emitter and Base-Tow) must be limited by the external circuitry.

2. Capacitor discharge – 10μF or less, 30V or less.

3. Intrinsic standoff ration is defined by the equation : Vp – Vf / Vb2b1 Where : Vp = Peak Point Emitter Voltage; Vb2b1 = Interbase ; Vf = Emitter to Base-one Junction Diode Drop (~0.45V @ 10μA)

4. Use pulse techniques : Pulse Width ~300μS, Duty Cycle % 2% to avoid internal heating due to interbase modulation which may result in erroneous readings.

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