This part is a kind of semiconductor called BAS21W.

Function of this product has SURFACE MOUNT SWITCHING DIODES.

Manufacturers : Pan Jit International Inc.

Image and pinout :

Some of the text within the PDF file :

BAS16W, BAS19W, BAS20W, BAS21W SURFACE MOUNT SWITCHING DIODES VOLTAGE 75-200 Volts FEATURES • Fast switching speed. • Surface mount package Ideally Suited for Automatic insertion • Electrically Identical to Standard JEDEC • High Conductance POWER 200 mWatts PACKAGE SOT-323 MECHANICAL DATA Case: SOT-323, Plastic Terminals: Solderable per MIL-STD-202, Method 208 Approx. Weight: 0.008 gram Marking: A6, A8, A80, A82 MAXIMUM RATINGS AND ELECTRICAL CHARACTERISTICS Ratings at 25OC ambient temperature unless otherwise specified. Single phase, half wave, 60 Hz, resistive or inductive load. For capacitive load, derate current by 20%. PARAMETER Reverse Voltage Peak Reverse Voltage Rectified Current (Average), Half Wave Rectification with Resistive Load and f >=50 Hz Peak Forward Surge C [ ... ]

BAS21W PDF Datasheet Download