This part is a kind of semiconductor called BY228.

Function of this product has Damper Diodes.

Manufacturers : SIYU

Image and pinout :

Some of the text within the PDF file :

SIYU R 反向电压 1500V 正向电流 5.0 A DO-27 BY228 阻尼二极管 特征 Features ·反向漏电流低 Low reverse leakage ·正向浪涌承受能力较强 High forward surge capability ·高温焊接保证 High temperature soldering guaranteed: 260℃/10 秒, 0.375" (9.5mm)引线长度。 260℃/10 seconds, 0.375" (9.5mm) lead length, ·引线可承受5 磅 (2.3kg) 拉力。 5 lbs. (2.3kg) tension ·引线和管体皆符合ROHS标准 。 Lead and body according with RoHS standard Damper Diodes Reverse Voltage 1500V Forward Current 5.0A 1.0(25.4) MIN .052(1.3) DIA .048(1.2) .375(9.5) .335(8.5) .220(5.6) DIA .197(5.0) 1.0(25.4) MIN 机械数据 Mechanical Data ·端子: 镀锡轴向引线 Terminals: Plated axial leads ·极性: 色环端为负极 Polarity: Color band denotes ca [ ... ]

BY228 PDF Datasheet Download