This part is a kind of semiconductor called SMB10.

Function of this product has SURFACE MOUNT UNIDIRECTIONAL AND BIDIRECTIONAL TRANSIENT VOLTAGE SUPPRESSORS.

Manufacturers : Lite-On Technology

Image and pinout :

Some of the text within the PDF file :

LITE ON POWER SEMICONDUCTOR SMB SERIES STAND-OFF VOLTAGE - 6.8 to 200 Volts POWER DISSIPATION - 600 WATTS SURFACE MOUNT UNIDIRECTIONAL AND BIDIRECTIONAL TRANSIENT VOLTAGE SUPPRESSORS FEATURES Rating to 200V VBR For surface mounted applications Reliable low cost construction utilizing molded plastic technique Plastic material has UL flammability classification 94V-O Typical IR less than 1uA above 10V Fast response time: typically less than 1.0ps for Uni-direction,less than 5.0ns for Bi-direction,form 0 Volts to BV min SMB SMB A DIM. A B B C C D E G F F E D G H MIN. 4.06 3.30 1.96 0.15 5.21 0.05 2.01 0.76 MAX. 4.57 3.94 2.21 0.31 5.59 0.20 2.62 1.52 MECHANICAL DATA Case : Molded plastic Polarity : by cathode band denotes uni-directional device none cathode band denotes bi-directional [ ... ]

SMB10 PDF Datasheet Download