3KSMC21AH 3000W Transient Voltage Suppressor Taiwan Semiconductor 3KSMC21AH 3000W Transient Voltage Suppressor (TVS) features a low-profile surface-mounted ideal for space-constrained designs. This TVS device protects electronics from voltage spikes, suppressing all overvoltages above its breakdown voltage. Taiwan Semiconductor 3KSMC21AH is offered in a compact DO-214AB package and is AEC-Q101 qualified for automotive applications.