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BUT21AF NPN Transistor

The BUT21AF is a bipolar junction transistor (BJT) with an NPN-type configuration. That means the BUT21AF transistor has a positively charged layer between two negatively charged layers. This transistor has three terminals Base, Collector, and Emitter.

The BUT21AF transistor symbol shows an arrow from the base into the emitter. This means that the current flows from collector terminal to emitter terminal.

Circuit diagram symbol of the BUT21AF transistor as follows.

Circuit diagram symbol of the BUT21AF transistor

BUT21AF Transistor Specification

Transistor Code BUT21AF
Transistor Type BJT
Transistor Polarity NPN
Transistor Material Silicon(SI)
Package ISO220
Collector Power Dissipation (Maximum) PC 20W
Collector-Base Voltage (Maximum) VCB 700V
Collector-Emitter Voltage (Maximum) VCE 350V
Collector Current (Maximum) IC 5A
Operating Junction Temperature (Maximum) TJ 200°C
Emitter-Base Voltage (Maximum) VEB 1.5V
Forward Current Transfer Ratio (hFE Value) 25

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