This part is a kind of semiconductor called SBL2040.

Function of this product has SCHOTTKY BARRIER DIODE.

Manufacturers : Gesar

Image and pinout :

Some of the text within the PDF file :

肖特基势垒二极管 SCHOTTKY BARRIER DIODE SBL2040 主要参数 IF(AV) VRRM Tj VF(max) MAIN CHARACTERISTICS 20（2×10）A 40 V 150 ℃ 0.5V （@Tj=125℃） 封装 Package TO-22O TO-22OF 用途 APPLICATIONS z High frequency switch z 高频开关电源 power supply z 低压续流电路和保护电 z Free wheeling diodes, 路 polarity protection applications TO-22OHF 产品特性 z 共阴结构 z 低功耗，高效率 z 良好的高温特性 z 有过压保护环， 高可靠性 z 环保（RoHS）产品 FEATURES z Common cathode structure z Low power loss, high efficiency z High Operating Junction Temperature z Guard ring for overvoltage protection，High reliability z RoHS product 订货信息 ORDER MESSAGE 订 货 型 号 Order codes SBL2040Z SBL2040ZR SBL2040F SBL2040FR [ ... ]

SBL2040 PDF Datasheet Download