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General Semiconductor LM 47A TVS

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.

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  • \$\begingroup\$ The manufacturer's symbol looks like ST electronics or the old SGS Thomson logo. \$\endgroup\$ – Andy aka Apr 3 at 15:45
  • \$\begingroup\$ I think it's General Semiconductor, now Vishay, but I could be wrong. \$\endgroup\$ – rdtsc Apr 3 at 15:52
  • \$\begingroup\$ ah you might be right. I' know in the last year I've had to reverse engineer one with this symbol and I forgot about GS. \$\endgroup\$ – Andy aka Apr 3 at 15:57
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Maybe it's this one the SMBG device from Vishay : -

enter image description here

The body dimensions don't quite match but maybe you measured it not quite so accurately. If you tried a slightly higher test current like 1 mA it might sit around 18.8 volts.

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