Standard Reference Designators

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  A

  Separable Assembly

  LS

  Loudspeaker, Buzzer

  AR

  Amplifier

  M

  Meter

  AT

  Attenuator; Isolator

  MG

  Motor-Generator

  B

  Blower, Motor

  MH*

  Mounting Hole

  BT

  Battery

  MK

  Microphone

  C

  Capacitor

  MP

  Mechanical Part

  CB

  Circuit Breaker

  P

  Connector, Plug, Male

  CP

  Connector Adapter, Coupling

  PS

  Power Supply

  CN

  Capacitor Network

  Q

  Transistor

  CR

  Breakdown Diode

  R

  Resistor

  D

  Diode

  RN

  Resistor Network

  DC

  Directional Coupler

  RT

  Thermistor

  DL

  Delay Line

  RV

  Varistor, Variable Resistor

  DS

  Display, Lamp

  S

  Switch

  E

  Terminal

  T

  Transformer

  F

  Fuse

  TB

  Terminal Board, Terminal Strip

  FD*

  Fiducial

  TC

  Thermocouple

  FL

  Filter

  TP**

  Test Point, In-circuit Test Points

  G

  Generator, Oscillator

  TZ

  Transzorb

  GN

  General Network

  U

  Inseparable Assembly, IC Pkg.

  H

  Hardware

  VR

  Voltage Regulator

  HY

  Circulator

  W

  Wire, Cable, Cable Assembly

  J

  Connector, Jack, Female

  X

  Fuse holder, Lamp holder, Socket

  K

  Contactor, Relay

  Y

  Crystal, Oscillator

  L

  Coil, Inductor, Bead, Ferrite Bead

  Z

  Miscellaneous

*These class letters would not appear in a parts list as they are part of a PCB and not an active electronic component.

**Not a class letter, but commonly used to designate test points for maintenance purposes.

Note: The above list is not exhaustive. See the standard list of class designation letters in ANSI Y32.2/IEEE Standard 315.

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