2N4033UB

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2N4033UB is a part of NPN silicon planar transistor within the family of bipolar junction transistors (BJTs). It is well suited for medium power amplification and switching applications. The device is well suited to be used in audio frequency, small signal and general purpose amplification, switching, preamplification stages, oscillators, small signal repeaters, protection circuits, driver transistor, detector and other circuits.

The typcal application field of 2N4033UB are audio frequency, small signal and general purpose applications:

• Small signal amplifiers
• Medium power switching applications
• General purpose amplifiers
• Pre-amplification stages
• Oscillators
• Small signal repeaters
• Protection circuits
• Driver transistor

2N4033UB is basically a three terminal device with a nominal amplification factor of about 40dB. It is also characterized by high voltage of up to 70V, collector current of up to 800mA, and power dissipation of up to 5W. The maximum continuous collector current is up to 150mA and the maximum DC collector current is up to 500mA. Due to its higher power dissipation and collector current, 2N4033UB can handle signals up to 500 KHz.

The working principle of a 2N4033UB can be classified as a depletion-mode or enhancement-mode type transistor. In the depletion-mode transistor, when the base-emitter junction is forward biased a depletion region is established which carries no current. The alternative type (enhancement-mode) has a continuous current flowing through it even when the base-emitter junction is forward biased. As the base-collector voltage is increased, a larger current is driven through the collector terminal. The working principal of 2N4033UB is a two emitter junction in which a second junction is formed between the first junction (base-emitter junction) and the collector.

The 2N4033UB is an economical BJT transistor suitable for a variety of application areas including, audio frequency, small signal and general purpose amplifiers, and medium power switching applications. The transistor is a reliable device and is available in a variety of packages to suit the need.

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