The STMicroelectronics SM6T7V5CA is a 600 W bidirectional TVS diode from the SM6T, TRANSIL™ series. It clamps a 6.4 V nominal rail to 14.5 V maximum during a surge, with a breakdown voltage starting at 7.13 V. The single bidirectional channel protects signal or power lines against both positive and negative transients, eliminating the need for two unidirectional devices in anti-series.
DO-214AA SMB — footprint and reflow
The SMB body is larger than the smaller SMA variant, giving it better thermal mass for absorbing the 600 W peak pulse without exceeding the -55 to 150 °C junction temperature range. Standard reflow profiles for SMB work; no special bake is required if the moisture barrier bag seal is intact.