84081| Datasheet

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VISHAY
Vishay Semiconductors

Symbols
Arrangement of Symbols
Letter symbols for current, voltage and power (according to DIN 41 785, sheet 1) To represent current, voltage and power, a system of basic letter symbols are used. Capital letters are used for the representation of peak, mean, dc or rootmean-square values. Lower case letters are used for the representation of instantaneous values which vary with time. Capital letters are used as subscripts to represent continuous or total values, while lower case letters are used to represent varying values. The following table summarizes the rules given above.
Basic letter Upper-case Instantaneous values which vary with time Upper-case Maximum (peak) average (mean) continuous (dc) or rootmean-square (RMS) values

The following table summarizes the rules given above.
Basic letter Upper-case Electrical parameters inherent in the semiconductor devices except inductances and capacitances Upper-case Electrical parameters of external circuits and of circuits in which the semiconductor device forms only a part; all inductances and capacitances

Subscript(s) Upper-case Small-signal values Upper-case Static (dc) values

Examples: RG Generator resistance GP Power gain hFE DC forward current transfer ratio in common emitter configuration rP Parallel resistance, damping resistance

Subscript(s) Upper-case Varying component alone,i.e.,instantaneous, root-mean-square, maximum or average values Upper-case Continuous (without signal) or total (instantaneous, average or maximum) values

Example for the use of Symbols
according to 41785 and IEC 148 b) Diode
VF VFSM VFRM VFWM

Letter symbols for impedance, admittances, two-port parameters etc. For impedance, admittance, two-port parameters, etc., capital letters are used for the representation of external circuits of which the device is only a part. Lower case letters are used for the representation of electrical parameters inherent in the device. The rules are not valid for inductance and capacitance. Both these quantities are denoted with capital letters. Capital letters are used as subscripts for the designation of static (dc) values, while lower case letters are used for the designation of small-signal values. If more than one subscript is used (hFE, hfe), the letter symbols are either all capital or all lower case. If the subscript has numeric (single, double, etc.) as well as letter symbol(s) (such as h21E or h21e), the differentiation between static and small-signal value is made only by a subscript letter symbol. Other quantities (values) which deviate from the above rules are given in the list of letter symbols.

0 t VRWM VRRM VRSM VR
Figure 1.
93 7796

VF VR VFSM VRSM VFRM VRRM VFWM VRWM

Forward voltage Reverse voltage Surge forward voltage (non-repetitive) Surge reverse voltage (non-repetitive) Repetitive peak forward voltage Repetitive peak reverse voltage Crest working forward voltage Crest working reverse voltage
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Document Number 84081 Rev. 1.2, 08-Jan-04