Standard Reference Designators : A Separable...

Sat, 15 Aug 2026 11:00:36 +0000

Author: Nick B
Subject: 3695
Posted: 15 Aug 2026 at 11:00am

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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PCB Libraries Forum : Standard Reference Designators

Standard Reference Designators : A Separable...