This part is a kind of semiconductor called GS1M.

Function of this product has SURFACE MOUNT RECTIFIER(VOLTAGE- 50 to 1000 Volts CURRENT - 1.0 Ampere).

Manufacturers : Pan Jit International Inc.

Image and pinout :

Some of the text within the PDF file :

DATA SHEET GS1A~GS1M SURFACE MOUNT RECTIFIER VOLTAGE- 50 to 1000 Volts CURRENT - 1.0 Ampere FEATURES .114 (2.90) .098 (2.50) .062 (1.60) .055 (1.40) .181 (4.60) .157 (4.00) .012 (.305) .006 (.152) SMA / DO-214AC Unit: inch ( mm ) • For surface mounted applications • Low profile package • Built-in strain relief • Easy pick and place • Plastic package has Underwriters Laboratory Flammability Classification 94V-O • Glass passivated chip junction • High temperature soldering : 260°C /10 seconds at terminals MECHANICAL DATA Case: JEDEC DO-214AC molded plastic Terminals: Solder plated, solderable per MIL-STD-750, Method 2026 Polarity: Indicated by cathode band Standard packaging: 12mm tape (EIA-481) Weight: 0.002 ounce, 0.064 gram .096 (2.30) .078 (2.00) .060 (1.52) .030 (0.7 [ ... ]

GS1M PDF Datasheet Download