Unijunction Transistors

WHEN IS A TRANSISTOR NOT A TRANSISTOR ?

Answer: When its a unijunction transistor. Strictly speaking, the unijunction transistor is not a transistor but a thyristor.It has no linear current gain and it can't be used as an amplifier! Its typical application is to trigger an Silicon Controlled Rectifier (SCR), although its output is often used to trigger other devices.Applications include: An SCR trigger, Oscillator, Timing, Sawtooth Generator, Long Time delays, etc.

An example is the 2N4949 Unijunction Transistor which features a tightly controlled intrinsic standoff ratio in a hermetically sealed TO-18 metal package. With a 7 Kohm interbase resistance, the 2N4949 is available for both industrial and military use.

Specifications for the 2N4949 are:

• 40 KHz operation
• Reverse Veb 30 Volts
• Hermetic Sealed Package
• 360 mW Power dissipation
• Available in Military Use
• Peak Point Emitter Current 1uA max
• Intrinsic standoff ration: 0.74 to 0.86

American Microsemiconductor Inc. supplies many unijunction transistors.(as listed below)

You can buy parts online at http://store.americanmicrosemiconductor.com/2n4949.html

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