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 |
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-base junction reverse biased (emitter open) |
BW | Bandwidth |
c | Centi (10-2) |
C | Capacitance or capacitor |
C | Transistor collector electrode |
C (Q) | Coulomb |
CB | Common base configuration |
CC | Common collector |
CE | Common emitter |
CL | Load capacitance |
CO | Output capacitance |
d | Deci (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 utoff frequency |
FET | Field effect transistor |
FF | Flip Flop |
FM | Frequency modulation |
fosc | Maximum frequency of oscillation |
fr | Frequency at resonance |
G | Conductance |
G | Giga (109 ) |
gm | Small-signal transconductance |
gM, gFE | Static or DC transconductance |
GM, GFE | Large-signal transconductance |
H | Henry |
H | Magnetic field intensity, Magnetizing flux |
h | hecto (102) |
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 resistor |
LED | Light emitting diode |
LF | Low frequency |
LM | Mutual inductance |
LNA | Low noise amplifier |
LSI | Large scale integration |
µ | Micro (10-6 ) |
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/transformer |
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 |
PRT | Pulse repetition time |
PWM | Pulse width modulation |
Q | Charge, also quality |
q | Instantaneous charge |
Q | Transistor |
R | Resistor |
RC | Resistance-capacitance |
rect | Rectifier |
ref | Reference |
RF | Radio frequencies |
RFI | Radio frequency interference |
RL | Load resistor |
RLC | Resistance-capacitance-inductance |
RMS | Root mean square |
rpm | Revolutions 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-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 |
VEE | Emitter voltage (DC) supply |
VF | Forward voltage drop |
VCO | Voltage controlled oscillator |
VHF | Very high frequency |
Vin | Input voltage |
VLF | Very low frequency |
Vm, Vmax | Maximum voltage |
VO, Vout | Output voltage (DC) |
Vp | Primary voltage |
VR | Reverse voltage (DC) |
Vr | Reverse voltage (peak) |
W | Watts (Max, Average, or rms) |
w | Watts (peak) |
XC | Capacitive reactance |
XL | Inductive reactance |
Y | Admittance |
Z | Impedance |
Zin | Input impedance |
Zo | Output impedance |
Zp | Primary impedance |
Zs | Secondary impedance |