VISHAY Vishay Semiconductors Basic Definitions Basic Sinterglass Diode Parameters The major parameters for the selection of the appropriate sinterglass diodes are the maximum reverse voltage (VRRM), the average forward current (IFAV) and for switching application the reverse recovery characteristic (trr), too. Additional parameters may be for example the reverse avalanche energy capability (ER) and forward surge capability (IFSM) etc. VR Reverse voltage VRRM Repetitive peak reverse voltage, including all repeated reverse transient voltages V(BR)R Reverse breakdown voltage IR Reverse (leakage) current, at a specified reverse voltage VR and temperature TJ IF Forward current VF Forward voltage drop, at a specified forward current IF and temperature TJ IFAV Average forward output current, at a specified current waveform (normally 10ms/50Hz half-sinewave, sometimes 8.3ms/60Hz half-sine-wave), a specified reverse voltage and a specified mounting condition (e.g. lead-length = 10mm or PCB mounted with certain pads and distance) IFSM Peak forward surge current, with a specified current waveform (normally 10ms/50Hz half-sine-wave, sometimes 8.3ms/60Hz half-sine-wave), trr Reverse recovery time, at a specified forward current (normally 0.5A), a specified reverse current (normally 1.0A) and specified measurement conditions (normally from 0 to 0.25A) ER Reverse avalanche energy, non-repetitive Polarity Conventions The voltage direction is given • by an arrow which points from the measuring point to the reference point or • by a two letter subscript, where the first letter is the measuring point and the second letter is the reference point. A A V1 B B V2=–V1=VBA=–VAB B 94 9315 Figure 1. The numerical value of the voltage is positive if the potential at the arrow tail is higher than at the arrow head; i.e., the potential difference from the measuring point (A) to the reference point (B) is positive. The numerical value of the voltage is negative if the potential at the arrow head is higher than the tail; i.e., the potential difference from the measuring point to the reference point is negative. Document Number 84067 Rev. 7, 07-Jan-03 . A I1 B A I2 = –I1 B 94 9316 A VAB In the case of alternating voltages, once the voltage direction is selected it is maintained throughout. The alternating character of the quantity is given with the time dependent change in sign of its numerical values Figure 2. The numerical value of the current is positive if the charge of the carriers moving in the direction of the arrow is positive (conventional current direction), or if the charge of the carriers moving against this direction is negative. The numerical value of the current is negative if the charge of the carriers moving in the direction of the arrow is negative, or if the charge of the carriers moving against this direction is positive. The general rules stated above are also valid for alternating quantities. Once the direction is selected, it is maintained throughout. The alternating character of the quantity is given with the time-dependent change in sign of its numerical values. www.vishay.com 1 VISHAY Vishay Semiconductors Polarity conventions for diodes Here, the direction of arrows is selected in such a way that the numerical values of currents and voltages are positive both for forward (F or f) and reverse (R or r) directions. A IF K VF A IR K 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. The following table summarizes the rules given above . VR Basic letter Figure 3. 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 is 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 . Upper-case Electrical parameters inherent in the semiconductor devices except inductances and capacitances 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 Upper-case Small-signal values Static (dc) values Examples: GP Power gain ZS Source impedance fT Transition frequency IF Forward current Example for the use of symbols according to 41785 and IEC 148 Basic letter Upper-case Upper-case Upper-case Instantaneous values which vary with time Maximum (peak) average (mean) continuous (DC) or root-mean-square (RMS) values VF VFSM VFRM VFWM Subscript(s) Upper-case Upper-case Varying component alone, i.e., instantaneous, root-mean-square, maximum or average values Continuous (without signal) or total (instantaneous, average or maximum) values Letter symbols for impedance, admittances, twoport 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. www.vishay.com 2 0 t VRWM VRRM VRSM VR 93 7796 Figure 4. VF Forward voltage VR Reverse voltage VFSM Surge forward voltage (non-repetitive) Document Number 84067 Rev. 7, 07-Jan-03 VISHAY Vishay Semiconductors VRSM Surge reverse voltage (non-repetitive) VFRM Repetitive peak forward voltage VRRM Repetitive peak reverse voltage VFWM Crest working forward voltage VRWM Crest working reverse voltage List of Symbols A Anode a Distance (in mm) bpn Normalized power factor C Capacitance, general Ccase Case capacitance CD Diode capacitance Ci Junction capacitance CL Load capacitance CP Parallel capacitance ER Reverse avalanche energy, non-repetitive F Noise figure f Frequency fg Cut-off-frequency g Conductance K Kelvin, absolute temperature IF Forward current iF Forward current, instantaneous total value IFAV Average forward current, rectified current IFRM Repetitive peak forward current IFSM Surge forward current, non-repetitive IFWM Crest working forward current IR Reverse current IRM Maximum reverse current iR Reverse current, instantaneous total value IRAV Average reverse current IRRM Repetitive peak reverse current IRSM Non-repetitive peak reverse current IRWM Crest working reverse current IS Supply current IZ Z-operating current IZM Z-maximum current l Length (in mm), (case-holder/soldering point) LOCEP (local epitaxy) A registrated trade mark of TEMIC for a process of epitaxial deposition on silicon. Applications occur in planer Z-diodes. It has an advantage compared to the normal process, with improved reverse current. P Power PR Reverse Power Document Number 84067 Rev. 7, 07-Jan-03 Ptot PV Pvp Q Qrr RF rf RL rP RR rr rs RthJA RthJC RthJL rz rzj rzth T T T Tamb tav Tcase tfr Tj TK TL tP tp ---T tr trr ts Tsd Tstg V(BR) VF VF VFAV Vo VFP Total power dissipation Power dissipation, general Pulse-power dissipation Quality Reverse recovery charge Forward resistance Differential forward resistance Load resistor Parallel resistance, damping resistance Reverse resistance Differential reverse resistance Series resistance Thermal resistance between junction and ambient Thermal resistance between junction and case Thermal resistance junction lead Differential Z-resistance in breakdown region (range) rz = rzj + rzth Z-resistance at constant junction temperature, inherent Z-resistance Thermal part of the Z-resistance Temperature, measured in centigrade Absolute temperature, Kelvin temperature Period duration Ambient temperature (range) Integration time Case temperature Forward recovery time Junction temperature Temperature coefficient Connecting lead temperature in the holder (soldering point) at the distance/(mm) from case Pulse duration (time) Duty cycle Rise time Reverse recovery time Storage time Soldering temperature Storage temperature (range) Breakdown voltage Forward voltage Forward voltage, instantaneous total value Average forward voltage Rectified voltage Turn on transient peak voltage www.vishay.com 3 VISHAY Vishay Semiconductors VFSM Surge forward voltage, non-repetitive VFRM Repetitive peak forward voltage VFWM Crest working forward voltage VHF RF voltage, RMS value VHF RF voltage, peak value VR Reverse voltage VR Reverse voltage, instantaneous total value VRSM Surge reverse voltage, non-repetitive VRRM Repetitive peak reverse voltage VRWM Crest working reverse voltage VS Supply voltage VT Temperature voltage VZ Z-operating voltage Zthp Thermal resistance - pulse operation ϕ Angle of current flow ηr Rectification efficiency To Time constant ∆CD 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 provided where necessary. Device Description The following information is provided: part number, semiconductor materials used, sequence of zones, technology used, device type and, if necessary construction. Also, information on the typical Applications and special Features is given Absolute Maximum Ratings The absolute maximum ratings indicate the maximum permissible operational and environmental conditions. Exceeding any one of these conditions could result in the destruction of the device. Unless otherwise 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 unfavorable operating conditions the specified maximum ratings of the devices used are never exceeded. These ratings could be exceeded because of changes in: • Supply voltage www.vishay.com 4 • 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, storage 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 maximum values) are grouped together with associated test conditions supplemented with graphs. Dimensions (Mechanical Data) Important dimensions and the sequence of connections 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 tolerances, then lead length and mounting hole dimensions are minimum values. All other dimensions are maximum. Document Number 84067 Rev. 7, 07-Jan-03 VISHAY Vishay Semiconductors Additional Information Not for new developments: This heading indicates that the device concerned should not be used in equipment under development. It is, however, available for devices presently in production. Document Number 84067 Rev. 7, 07-Jan-03 www.vishay.com 5