meaning of hfe in transistors
hFE is a transistor parameter that denotes its gain ratio. This is also called Ã®Â² So if you see a bipolar transistor hFE, gain, or Ã®Â², it's the same item referenced with different terms. In technical terms, hFE for a transistor is the gain ratio of the collector current (output) divided by the base current (input). This gain is measured in a transistor circuit called the Common Emitter with a specific Collector Current and Collector Voltage. For example, if 200mA is produced in the collector circuit by a base current of 2mA, that transistor gain is 100. When transistors are made, production lots will have a spread, or range of hFE. For many ROHM bipolar transistors, the gain rank is denoted by a letter suffix in the part number.