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Transistors on schematics are labeled Q followed by a reference number because of tradition. The letter could be something else, for example I have some old schematics that use T, however T is traditionally used for Transformers.

Some other traditional schematic component labels are:

  • R, resistor
  • C, capacitor
  • L, inductor/coil
  • V, vacuum tube
  • U or IC, integrated circuit
  • D or CR, semiconductor diode
  • Z, zener diode
  • M, meter or motor
  • ANT, antenna
  • CB, circuit breaker
  • F, fuse
  • RT, thermistor
  • J, female connector/socket
  • P, male connector/plug
  • Y, crystal
  • E or G, ground
  • S or SW, switch
  • K, relay or contactor
  • B or BT, battery
  • PS, power supply
  • NE, neon lamp
  • DS, display or lamp
In general the labels are assigned with a mnemonicvalue, but this can't always be done so some like Q and Y are arbitrary. There are official standards from IEEE, ANSI, ISO, etc. but they are often ignored.
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11y ago

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