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TVS Datasheet(PDF) 1 Page - Vishay Siliconix |
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TVS Datasheet(HTML) 1 Page - Vishay Siliconix |
1 / 4 page Document Number: 88490 For technical questions within your region, please contact one of the following: www.vishay.com Revision: 09-Aug-10 DiodesAmericas@vishay.com, DiodesAsia@vishay.com, DiodesEurope@vishay.com 1 VISHAY GE NERAL SEMICONDUCTOR Transient Voltage Suppressors Application Note Transient Voltage Suppressors (TVS) for Automotive Electronic Protection By Soo Man (Sweetman) Kim, Senior Application Manager A major challenge in automotive design is protecting electronics - such as control units, sensors, and entertainment systems - against damaging surges, voltage transients, ESD, and noise that are present on the power line. Transient voltage suppressors (TVS) are ideal solutions for automotive electronic protection and have several important parameters for these applications, including power rating, stand-off voltage, breakdown voltage, and maximum breakdown voltage. Following are definitions for these parameters. Power rating The power rating of a TVS is its surge-absorbing capability under specific test or application conditions. The industrial- standard test condition of 10 μs/1000 μs pulse form (Bellcore 1089 spec.), as shown in Figure 1. This test condition differs from the TVS ESD test condition of 8 μs/20 μs pulse form, as shown in Figure 2. Fig. 1 - Test Waveform of TVS Fig. 2 - Test Waveform of TVS ESD Breakdown Voltage (VBR) The breakdown voltage is the voltage at which the device goes into avalanche breakdown, and is measured at a specified current on the datasheet. Maximum Breakdown Voltage (VC: Clamping Voltage) The clamping voltage appears across the TVS at the specified peak pulse current rating. The breakdown voltage of a TVS is measured at a very low current, such as 1 mA or 10 mA, which is different from the actual avalanche voltage in application conditions. Thus, semiconductor manufactures specify the typical or maximum breakdown voltage in large current. Stand-Off Voltage (VWM): Working Stand-Off Reverse Voltage The stand-off voltage indicates the maximum voltage of the TVS when not in breakdown, and is an important parameter of protection devices in circuits that do not operate under normal conditions. In automotive applications, some regulation of the automotive electronics is provided by “jump-start protection”. This condition supplies 24 VDC in 10 min to 12 V type electronics, and 36 VDC in 10 min to 24 V type electronics without damage or malfunction of the circuit. Thus, the stand-off voltage is one of the key parameters in TVS for automotive electronics. 0 0.5 1.0 2.0 2.5 0 % 100 % 50 % (ms) 10 µs I PPM 1.5 I PPM 2 10 μs/1000 μs 0 5 10 20 25 0 % 100 % 50 % (μs) 8 μs I PPM 15 2 8 μs/20 μs I PPM |
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