JAN-03 Datasheet, PDF (4/5 Pages) Vishay Siliconix – Basic Definitions

Vishay Semiconductors
VISHAY
V_FSM Surge forward voltage, non-repetitive
V_FRM Repetitive peak forward voltage
V_FWM Crest working forward voltage
V_HF RF voltage, RMS value
V_HF RF voltage, peak value
V_R Reverse voltage
V_R Reverse voltage, instantaneous total value
V_RSM Surge reverse voltage, non-repetitive
V_RRM Repetitive peak reverse voltage
V_RWM Crest working reverse voltage
V_S Supply voltage
V_T Temperature voltage
V_Z Z-operating voltage
Z_thp Thermal resistance - pulse operation
ϕ Angle of current flow
η_r Rectification efficiency
T_o Time constant
∆C_D Capacitance deviation
Data Sheet Construction
Data sheet information is generally presented in the
following sequence:
• Device description
• Absolute maximum ratings
• Thermal data - thermal resistances
• Characteristics, switching characteristics
• Electrical characteristics
• Dimensions (mechanical data)
Additional information on device performance is pro-
vided where necessary.
Device Description
The following information is provided: part number,
semiconductor materials used, sequence of zones,
technology used, device type and, if necessary con-
struction.
Also, information on the typical Applications and spe-
cial Features is given
Absolute Maximum Ratings
The absolute maximum ratings indicate the maximum
permissible operational and environmental condi-
tions. Exceeding any one of these conditions could
result in the destruction of the device. Unless other-
wise specified, an ambient temperature of 25°C ±
3°C is assumed for all absolute maximum ratings.
Most absolute ratings are static characteristics; if they
are measured by a pulse method, the associated
measurement conditions are stated.
Maximum ratings are absolute
(i.e., not interdependent).
Any equipment incorporating semiconductor devices
must be designed so that even under the most unfa-
vorable operating conditions the specified maximum
ratings of the devices used are never exceeded.
These ratings could be exceeded because of
changes in:
• Supply voltage
• The properties of other components used in the
equipment
• Control settings
• Load conditions
• Drive level
• Environmental conditions
• The properties of the devices themselves (aging)
Thermal Data - Thermal Resistances
Some thermal data (e.g., junction temperature, stor-
age temperature range, total power dissipation),
impose a limit on the application range of the device,
and are given under the heading "Absolute Maximum
Ratings".
A special section is provided for thermal resistances.
Temperature coefficients, on the other hand, are
listed together with the associated parameters under
„Characteristics, Switching Characteristics“.
Characteristics, Switching Characteristics
Under this heading, the most important operational
electrical characteristics (minimum, typical and maxi-
mum values) are grouped together with associated
test conditions supplemented with graphs.
Dimensions (Mechanical Data)
Important dimensions and the sequence of connec-
tions supplemented by a circuit diagram are included
in the mechanical data. Case outline drawings carry
DIN, JEDEC or commercial designations. Information
on weight complete is also included.
Note:
If the dimension information does not include any tol-
erances, then lead length and mounting hole dimen-
sions are minimum values. All other dimensions are
maximum.
www.vishay.com
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Document Number 84067
Rev. 7, 07-Jan-03