Symbols And Abbreviations

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A

Ampere (AC rms or DC)

a

Ampere (peak)

A/D

Analog to digital

AC

Alternating Current

AC/DC

Alternating Current or Direct Current

ADC

Analog to Digital Converter

AF

Audio Frequency

AH

Ampere hour

AM

Amplitude Modulation

FM

Frequency Modulation

AWG

American Wire Gauge

B

Transistor Base Electrode

B

Magnetizing Flux Density

BCD

Binary Coded Decimal

BJT

Bipolar Junction Transistor

BV

Breakdown Voltage

BVCEO

Breakdown voltage, collector-to-emitter junction reverse biased (base open)

BVCES

Breakdown voltage, collector-to-emitter junction reverse biased (base Shorted)

BVCOB

Breakdown voltage, collector-to-emitter junction reverse biased (emitter open)

BW

Bandwidth

C

Centi (10-1)

D/A

Digital to Analog

DC

Direct Current

DIP

Dual in line package

E

Transistor Emitter electrode

EHF

Extremely High Frequency

EHV

Extra High Voltage

ELF

Extremely low Frequency

EMF

Electromotive Force

EMI

Electromagnetic Interference

F

Farad

f

Frequency

fab

Common Base small signal cutoff frequency

fae

Common Emitter small signal cutoff frequency

FET

Field Effect Transistor

FF

Flip Flop

FM

Frequency Modulation

FOSC

Maximum frequency of Oscillation

G

Conductance

G

Giga (109)

gm

Small Signal Transconductance

gM, gFE

Static or DC Trans conductance

GM, GFE

Large Signal Trans conductance

H

Henry

H

Magnetic Field Intensity, Magnetizing Flux

HF

High Frequency

hfb

Common Base Small Signal Forward Current Transfer Ratio

hfe

Common Emitter Small Signal Forward Current Transfer Ratio (Base Input)

hFE

Common Emitter DC Forward Current Transfer Ratio, Current gain (IC/IB)

hrb

Common Base Small Signal Reverse Transfer Voltage Ratio (Emitter Input)

hrc

Common Collector Small Signal Reverse Transfer Voltage Ratio (Base Input)

hre

Common Emitter Small Signal Reverse Transfer Voltage Ratio (Base Input)

Hz

Hertz

I

Current

i

Instantaneous Current

I/O

Input/Output

IB

Base Current

IC

Integrated Circuit

IC

Collector Current

ICBO,ICO

Collector Cutoff Current (Emitter Open)

ICEO

Collector Cutoff Current (Base Open)

ICER

Collector Cutoff Current (Specified Resistance Base Emitter)

IE

Emitter Current

IEBO

Emitter Cutoff Current (Collector Open)

Ieff

Effective Current

IF

Forward Current (DC)

iFr

Forward Recovery Current (Specified Instantaneous Value)

IO

Output Current (DC)

IR

Infrared

IR

Reverse Current (DC)

iR

Reverse Current (Peak)

iRr

Reverse Recovery Current (Specified Instantaneous Value)

IS

Secondary Current

isurge

Surge Current

Iz

Zener Current

IZK

Zener Knee Current

IZM

Zener Maximum Current

IZT

Zener Test Current

JFET

Junction Field Effect Transistor

K

Coefficient of Coupling

k

Kilo (103)

kHz

Kilohertz

kWh

Kilowatt hour

L

Coil, Inductance

LC

Inductance Capacitance

LCD

Liquid Crystal Display

LCR

Inductance Capacitance Resistance

LDR

Light Dependent Diode

LED

Light Emitting Diode

LF

Low Frequency

LM

Mutual Inductance

LNA

Low Noise Amplifier

LSI

Large Scale Integration

m

Milli (10-3)

M

Mega (106)

M

Mutual Conductance

MCU

Microcontroller

MF

Medium Frequency

MHz

Megahertz

MI

Mutual Inductance

mmf

Magnetomotive force

MOS

Metal Oxide Semiconductor

MOSFET

Metal Oxide Semiconductor Field Effect Transistor

MPU

Microprocessor Unit

N

Number of Turns of Inductor/Transformers

n

Nano (10-9)

NC

Normally Closed

NC

No Connection

NO

Normally Open

NPN

Negative Positive Negative

OP AMP

Operational Amplifier

p

Pico (10-12)

P

Power

p

Instantaneous Power

PAL

Programmable Array Logic

PAM

Pulse Amplitude Modulation

Pap

Apparent Power

Pav

Average Power

PCB

Printed Circuit Board

PCM

Pulse Code Modulation

Pd

Power Dissipation of Device (Average)

PDM

Pulse Duration Modulation

PIV

Peak Inverse Voltage

PLD

Programmable Logic Device

PLL

Phase Locked Loop

PM

Phase Modulation

PNP

Positive Negative Positive

POT

Potentiometer

P-P

Peak to Peak

PPM

Pulse Position Modulation

PRF

Pulse Repetition Frequency

PWM

Pulse Width Modulation

Q

Charge also Quantity

q

Instantaneous Charge

Q

Transistor

R

Resistor

RC

Resistance Capacitance

rect

Rectifier

ref

Reference

RF

Radio Frequency

RFI

Radio Frequency Interference

RL

Load Resistor

RLC

Resistance Inductance Capacitance

RMS

Root Mean Square

rpm

Revolution Per Minute

SCR

Silicon Controlled Rectifier

SHF

Super High Frequency

SIP

Single in Line Package

SMC

Surface Mount Components

SMD

Surface Mount Devices

SMT

Surface Mount Technology

SNR

Signal to Noise Ratio

SO

Small Outline

SOD

Small Outline Diode

SOIC

Small Outline Integrated Circuit

SOT

Small Outline Transistor

SPDT

Single Pole Double Throw

SW

Short Wave

T

Tera (1012)

T

Transformer

t

Time

T, temp

Temperature

TA

Ambient Temperature

TC

Temperature Case

TC

Time Constant, also Temperature Coefficient

td

Pulse delay time

tf

Pulse fall time

tfr

Forward Recovery Time

Tj

Junction Temperature

tP

Pulse Time

tr

Pulse Rise Time

ts

Pulse Storage Time

TTL

Transistor to Transistor Logic

UHF

Ultra-High Frequency

UHV

Ultra-High Voltage

UJT

Unijunction Transistor

UV

Ultraviolet

V

Volt (DC)

v

Volt (Peak), Instantaneous voltage

VA

Volt Ampere

Va-c

Volt (AC)

VBB

Base Voltage (DC) Supply

VBE

Base to Emitter Voltage (DC)

VCC

Collector voltage (DC) Supply

VCE

Collector to Emitter Voltage (DC)

VCEsat

Collector to Emitter Saturation Voltage

 

 

 

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