This part is a kind of semiconductor called GS1M.

Function of this product has 1 Amp Silicon Rectifier 50 to 1000 Volts.

Manufacturers : Micro Commercial Components

Image and pinout :

Some of the text within the PDF file :

MCC Features • • • •
  omponents 21201 Itasca Street Chatsworth    !"# $ %    !"# GS1A THRU GS1M For Surface Mount Applications Extremely Low Thermal Resistance Easy Pick And Place High Temp Soldering: 250 °C for 10 Seconds At Terminals 1 Amp Silicon Rectifier 50 to 1000 Volts DO-214AC (SMAJ) (High Profile) H Cathode Band • • • Maximum Ratings Operating Temperature: -55 °C to +150°C Storage Temperature: -55°C to +150°C Maximum Thermal Resistance; 15 °C/W Junction To Lead MCC Catalog Number GS1A GS1B GS1D GS1G GS1J GS1K GS1M Device Marking GS1A GS1B GS1D GS1G GS1J GS1K GS1M Maximum Recurrent Peak Reverse Voltage 50V 100V 200V 400V 600V 800V 1000V Maximum RMS Voltage 35V 70V 140V 280V 420V 560V 700V Maximu [ ... ]

GS1M PDF Datasheet Download