TSD05/TSD05C Surge Protection Device Texas Instruments TSD05/TSD05C Surge Protection Device is designed for clamping harmful transients such as ESD and surge. The TSD05 is unidirectional and the TSD05C is bidirectional. The TSD05/TSD05C is rated to dissipate ESD strikes up to ±30kV (contact and air gap discharge) and also meets the maximum level specified in the IEC 61000-4-2 international standard (Level 4). For surges, the device can clamp 8/20µs surges with peak currents up to 60A (TSD052) and 30A (TSD05C) following the IEC 61000-4-5 standard.