The 5.0SMCJ54CA-AQ is an ESD Suppressors / TVS Diodes TVS Diode, SMC, 54V, 5000W, Bidir manufactured by Diotec. It is a silicon avalanche protection diode designed for the protection of electronic systems against electrical transients induced by lightning and other overvoltage events. This diode is configured with two terminals, one positive and one negative, and allows current to flow in both directions to greatly reduce the effects of transient surges. It has a rugged design, fast switching response, and a low peak pulse power. The allowable peak power dissipation is up to 5000W. This device has a peak pulse current rating of 600A, and a clamping voltage of 89V.