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1N5345B Datasheet(PDF) 5 Page - Motorola, Inc |
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1N5345B Datasheet(HTML) 5 Page - Motorola, Inc |
5 / 6 page 1N5333B through 1N5388B Motorola TVS/Zener Device Data 6-5 5 Watt Surmetic 40 Data Sheet Devices listed in bold, italic are Motorola preferred devices. VZ, ZENER VOLTAGE (VOLTS) 1000 100 10 1 0.1 10 20 30 40 50 60 70 80 100 10 1 0.1 80 100 120 140 160 180 200 220 VZ, ZENER VOLTAGE (VOLTS) T = 25 °C Figure 9. Zener Voltage versus Zener Current VZ = 11 thru 75 Volts Figure 10. Zener Voltage versus Zener Current VZ = 82 thru 200 Volts APPLICATION NOTE Since the actual voltage available from a given zener diode is temperature dependent, it is necessary to determine junc- tion temperature under any set of operating conditions in order to calculate its value. The following procedure is recom- mended: Lead Temperature, TL, should be determined from: TL = θLA PD + TA θLA is the lead-to-ambient thermal resistance and PD is the power dissipation. Junction Temperature, TJ, may be found from: TJ = TL + ∆TJL ∆TJL is the increase in junction temperature above the lead temperature and may be found from Figure 4 for a train of power pulses or from Figure 5 for dc power. ∆TJL = θJL PD For worst-case design, using expected limits of IZ, limits of PD and the extremes of TJ (∆TJ) may be estimated. Changes in voltage, VZ, can then be found from: ∆V = θVZ ∆TJ θVZ,thezenervoltagetemperaturecoefficient,isfoundfrom Figures 2 and 3. Under high power-pulse operation, the zener voltage will vary with time and may also be affected significantly by the zener resistance. For best regulation, keep current excursions as low as possible. Data of Figure 4 should not be used to compute surge capa- bility. Surge limitations are given in Figure 6. They are lower than would be expected by considering only junction tempera- ture, as current crowding effects cause temperatures to be ex- tremely high in small spots resulting in device degradation should the limits of Figure 6 be exceeded. |
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