NTE6401
Unijunction Transistor (UJT)

Description:

The NTE6401 is designed for use in pulse and timing circuits, sensing circuits, and thyristor trigger circuits.

Features:

Absolute Maximum Ratings: (TA = +25°C unless otherwise specified)
Power Dissipation (Note 1), PD     300mW
RMS Emitter Current, IE(RMS)     50mA
Peak Pulse Emitter Current (Note 2) Current, iE     2A
Emitter Reverse Voltage, VB2E     30V
Interbase Voltage, VB2B1     35V
Operating Junction Temperature Range, TJ     -65° to +125°C
Storage Temperature Range, Tstg     -65° to +150°C

Note 1.Derate 3mW/°C increase in ambient temperature. The total power dissipation (available power to Emitter and Base-Two) must be limited by the external circuitry.
Note 2.Capacitor discharge - 10µF or less, 30V or less.

Electrical Characteristics: (TA = +25°C unless otherwisze specified)
Parameter Symbol Test Conditions Min Typ Max Unit
Intrinsic Standoff Ratio   VB2B1 = 10V, Note 3 0.56 - 0.75 -
Interbase Resistance rBB VB2B1 = 3V, IE = 0 4.7 7.0 9.1 k Ohms
Interbase Resistance Temperature Coefficient     0.1 - 0.9 %/°C
Emitter Saturation Voltage VEB1(sat) VB2B1 = 10V, IE = 50mA, Note 4 - 3.5 - V
Modulated Interbase Current IB2(mod) VB2B1 = 10V, IE = 50mA - 15 - mA
Emitter Reverse Current IEB20 VB2E = 30V, IB1 = 0 - 0.005 12 µA
Peak Point Emitter Current IP VB2B1 = 25V - 1 5 µA
Valley Point Current IV VB2B1 = 20V, RB2 = 100 Ohms 4 6 - mA
Base-One Peak Pulse Voltage VOB1   3 5 - V

Note 3.Intrinsic standoff ratio is defined by the equation:

            VP - VF / VB2B1

where: VP = Peak Point Emitter Voltage; VB2B1 = Interbase Voltage; VF = Emitter to Base-One Junction Diode Drop (~0.45V @ 10µA)

Note 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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