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Semiconductor Symbols and Abbreviations

A Ampere (AC rms or DC) hie Common emitter small-signal short-circuit input impedance (base input)
a Ampere (peak) hob Common base small-signal open-circuit output admittance (emitter input)
B Base electrode hoc Common collector small-signal open-circuit output admittance (base input)
BV Breakdown voltage hoe Common emitter small-signal open-circuit output admittance (base input)
BVCOB Breakdown voltage, collector-to-base junction reverse biased (emitter open) hrb Common base small signal open-circuit reverse transfer voltage ratio (emitter input)
BVCEO Breakdown voltage, collector-to-emitter junction reverse biased (base open) hrc Common collector small signal open-circuit reverse transfer voltage ratio (base input)
BVCER Breakdown voltage, collector-to-emitter junction reverse biased (specified resistance) hre Common emitter small signal open-circuit reverse transfer voltage ratio (base input)
BVCES Breakdown voltage, collector-to-emitter junction reverse biased (base shorted) isurge Surge current
BVCEX Breakdown voltage, collector-to-emitter junction reverse biased (base-emitter back biased) IB Average base current (DC)
C Capacitance; collector electrode Ib Instantaneous base current (AC rms)
Ce Internal collector junction capacitance. ib Base current (peak)
C(dep) Depletion layer capacitance mW Milliwatt (Max., Average, or rms)
C(dif) Diffusion capacitance mw Milliwatt (peak)
Cib Input Capacitance, common base NF Noise figure
IC Collector current (DC) nsec Nanosecond (Millimicrosecond)
Ic Collector current (AC rms) P Power dissipation of all terminals (average total)
ic Collector current (peak) p Power dissipation of all terminals (peak)
ICBO, ICO Collector cutoff current (emitter open) Pb Power dissipation of base (average)
ICEO Collector cutoff current (base open) pb Power dissipation of base (peak)
ICER Collector cutoff current (specified resistance base-emitter) Pc Power dissipation of collector (average)
ICERV Collector cutoff current (reverse voltage on base) pc Power dissipation of collector (peak)
IE Average emitter current (DC) Pd Power dissipation of device (average)
Ie Instantaneous emitter current (AC rms) Pe Power dissipation of emitter (average)
ie Instantaneous emitter current (peak) pe Power dissipation of emitter (peak)
IEBO Emitter cutoff current (collector open) PIV Peak inverse voltage
IF Forward current (DC) Q Transistor
iF Forward current (DC) rb', rBB' Internal base spreading resistance
iFr Forward recovery current (specified instantaneous value) RB External base resistance
IO Output current (DC) RC External collector resistance
IR Reverse current (DC) RE External emitter resistance
iR Reverse current (peak) Rsat Saturation resistance
iRr Reverse recovery current (specified instantaneous value) RL Resistance, load
IZ Average Zener current T Temperature
IZK Zener knee current t Time
IZM Zener maximum current TA Temperature, ambient
IZT Zener test current TC Temperature, case
iZ Instantaneous Zener current (AC rms) TCBV Temperature coefficient of breakdown voltage
K Kilohm td Pulse delay time
LC Conversion loss tf Pulse fall time
mA Milliampere (average) tfr Forward recovery time
ma Milliampere (peak) Tj Junction temperature
mAa-c Milliampere (AC rms) tP Pulse time
mAd-c Milliampere (DC) tr Pulse rise time
A Microampere (average) ts Pulse storage time
a Microampere (peak) V Volt (DC)
CL Load capacitance v Volt (peak)
Cob Output capacitance, common base Va-c Volt (AC)
Coe Output capacitance, common emitter VBB Base voltage (DC) supply
E Emitter electrode VBE Emitter voltage (DC) (base to emitter)
fab Common base small-signal short-circuit forward current transfer-ratio cutoff frequency (emitter input) VCC Collector voltage (DC) supply
fae Common emitter small-signal short-circuit forward current transfer-ratio cutoff frequency VCEsat Collector to emitter saturation voltage
fref Reference frequency VEC Emitter voltage (DC) (emitter to collector)
fosc Maximum frequency of oscillation VEE Emitter voltage (DC) supply
fpg Power gain cutoff frequency Vfe Floating potential
Gb Power gain (common base) VF Forward voltage drop
Gc Power gain (common collector) VO Output voltage (DC)
Ge Power gain (common emitter) vO Output voltage (DC)
gM, gFE Static or DC transconductance VPT Voltage, punch-through
gm Small-signal transconductance VR Reverse voltage (DC)
GM, GFE Large-signal transconductance Vr Reverse voltage (peak)
hfb Common base small signal short-circuit forward current transfer-ratio VZ Zener voltage
hfe Common emitter small-signal short-circuit forward current transfer-ratio (base input) W Watts (Max., Average, or rms)
hFE Common emitter DC short-circuit forward current transfer-ratio current gain (IC / IB) w Watts (peak)
HFE Common emitter large-signal short-circuit forward current transfer-ratio Zz Zener impedance
hib Common base small-signal short-circuit input impedance (emitter input) Zzk Zener impedance, knee
    Zzt Zener impedance, test
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