The SM5S43ATHE3/I from Vishay General Semiconductor - Diodes Division is a TVS diode with 43 V working peak voltage and 69.4 V clamping voltage, rated 52 A Ipp, surface mount in a DO-218AC package.
The SM5S43A-AU_R2_000A1 from Panjit International Inc. is a surface-mount TVS diode in a DO-218AB package with a 69.4 V clamp voltage and 52 A peak pulse current (Ipp), rated 3.6 kW.