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Standard Reference Designations for Electrical Equipment

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Standard Reference Designations for Electrical Equipment can be found published in ANSI Y32.2 1975/IEEE STD 315. Below is a partial list of the reference designations used in electronics. In order to standardize the way in which components are identified within schematics, the IEEE introduced a standard IEEE 200-1975 as the "Standard Reference Designations for Electrical and Electronics Parts and Equipment’s." This was later withdrawn and later the ASME (American Society of Mechanical Engineers), initiated the new standard ASME Y14.44-2008. Some of the more commonly used printed circuit board reference designators are given below.

Reference Designations

A

Abbrv. Meaning
A Assembly
AN, AS Antenna Aerial
AR Amplifier
AT, ATT Attenuator; Isolator

B

Abbrv. Meaning
B Blower, Motor
BR Bridge Rectifier
B, BT Battery
BZ Buzzer

C

Abbrv. Meaning
C Capacitor
CB Circuit Breaker
CP Coupler
CR, XTAL Crystal Rectifier (Diode)

D

Abbrv. Meaning
D Diode; Thyristor; Varacter
DC Directional Coupler
DP Diplexer
DL Delay Line
DS Display; LED Lamp

E

Abbrv. Meaning
E Terminal

F

Abbrv. Meaning
F Fuse
FB, FEB Ferrite Bead
FD Fiducial
FL Filter

G

Abbrv. Meaning
G Generator, Oscillator

H

Abbrv. Meaning
HW Hardware
HY Circulator

I

Abbrv. Meaning
IC Integrated Chip, Integrated Circuit (IC)

J

Abbrv. Meaning
J Jack Connector (Least Movable)
JP Jumper

K

Abbrv. Meaning
K Relay

L

Abbrv. Meaning
L Coil; Inductor, Choke
LED LIght Emitting Diode
LS Loud Speaker/Buzzer

M

Abbrv. Meaning
M Measuring equipment, Meter
MH Mounting Hole
MK Microphone
MP Mechanical Part (including screws and fasteners)

N

Abbrv. Meaning
Ne Neon

O

Abbrv. Meaning
OP Operational Amplifier (OP AMP)

P

Abbrv. Meaning
P Plug Type Connector (Most Moveable)
PS Power Supply

Q

Abbrv. Meaning
Q, TR Transistor

R

Abbrv. Meaning
R Resistor, or Potentiometer
RC Filter Network, RC
RN Resistor Network
RT Thermistor
RY, RLA Relay

S

Abbrv. Meaning
S, SW Switch

T

Abbrv. Meaning
TP Test Point
TH Thermistor
TR Transistor
TR Transducer
TUN, TN Tuner

U

Abbrv. Meaning
U Integrated Circuit (IC) or inseparable assembly

V

Abbrv. Meaning
V Vacuum Tube, Electron Tube, Photoelectric Cell

W

Abbrv. Meaning
W Cable Transmission, Wire Jumper or Busbar

X

Abbrv. Meaning
X Socket
XTAL Crystal Rectifier (Diode)
XMER Transformer

Y

Abbrv. Meaning
Y Crystal, Oscillator

Z

Abbrv. Meaning
Z, DZ Zener Diode

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