8.5.1 Protection Specifications

The TVS2700 is specified according to both the IEC 61000-4-5 and IEC 61643-321 standards. This enables usage in systems regardless of which standard is required in relevant product standards or best matches measured fault conditions. The IEC 61000-4-5 standard requires protection against a pulse with a rise time of 8 µs and a half length of 20 µs while the IEC 61643-321 standard requires protection against a much longer pulse with a rise time of 10 µs and a half length of 1000 µs.

The positive and negative surges are imposed to the TVS2700 by a combinational waveform generator (CWG) with a 2-Ω coupling resistor at different peak voltage levels. For powered on transient tests that need power supply bias, inductances are usually used to decouple the transient stress and protect the power supply. The TVS2700 is post tested by guaranteeing that there is no shift in device breakdown or leakage at V_rwm.

In addition, the TVS2700 has been tested according to IEC 61000-4-5 to pass a ±1 kV surge test through a 42-Ω coupling resistor and a 0.5 µF capacitor. This test is a common test requirement for industrial signal I/O lines and the TVS2700 will serve an ideal protection solution for applications with that requirement.

The TVS2700 also integrates IEC 61000-4-2 Level 4 ESD Protection and 80 A of IEC 61000-4-4 EFT Protection. These combine to ensure that the device can protect against all transient conditions regardless of length or type.

For more information on TI's test methods for Surge, ESD, and EFT testing, reference TI's IEC 61000-4-x Testing Application Note.