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Bipolar Junction Transistor (BJT)

Product Announcement from American Microsemiconductor, Inc.

Bipolar Junction Transistor (BJT)-Image

Description of bipolar transistor

The transistor is primarily used as a current amplifier. When a small current signal is applied to the base terminal of a bipolar transistor, it is amplified in the collector circuit. This current amplification is referred to as hfe or beta and equals Ic/Ib. As with all semiconductors, breakdown voltage of a transistor is also a design limitation. There are breakdown voltages that must be taken into account for each combination of terminals of a transistor. i.e. Vce, Vbe, and Vcb. However, Vce (collector-emitter voltage) with open base, designated as Vceo, is usually of most concern and defines the maximum circuit voltage of a bipolar transistor.

Also as with all semiconductors devices, there are undesirable leakage currents in a transistor, notably Icbo ,collector junction leakage; and Iebo, emitter junction leakage.

Selection of a Bipolar Transistor

Primary considerations when selecting a transistor are:

  • Voltage ratings
  • Transistor power rating and thermal resistance
  • Transistor current handling capability and the transistor case size
  • Leakage currents, mainly Icbo and Iebo in a transistor
  • Transistor frequency response and /or switching times.
  • Transistor current gain (HFE and hfe)
  • Temperature parameter variation of a transistor
  • Collector-emitter saturation resistance of a transistor
  • h-parameters of a transistor for linear applications

Click Below for additional specifications and ordering information:

Did you Know ?

  •  American Microsemiconductor Inc. (AMS) is Certified AS9100: Rev C and ISO9001:2008
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  • We offer equivalents and replacements for discontinued/obsolete Semiconductors
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  •  AMS also  has our large inventory online at www.Amazon.com
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  •  Have a requirement, call us at 973-377-9566, Fax us at 973-377-3078,              email at sales@americanmicrosemi.com, or visit one of our stores at: http://store.americanmicrosemiconductor.com, or www.Amazon.com

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