What is this exactly? It measures 0.14" (3.55mm) wide x 0.22" (5.56mm) tall x 0.09" (2.26mm) thick, likely a DO-214AA or SMB package. Circa 2016. Removed and photographed.
Out-of-circuit it measured as an 18v bidirectional TVS using a 100k resistor. See where the Vishay SM6T18A is marked "LM7" and SMBJ15A is marked "LM" but these are both uni-directional. Application is bidirectional (IGBT gate clamp.) Thanks for looking.