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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