This part is a kind of semiconductor called TE2515.

Function of this product has Damper Diodes.

Manufacturers : Siyu

Image and pinout :

Some of the text within the PDF file :

SIYU R ×è Äá ¶þ ¼« ¹Ü TE2515 Damper Diodes Reverse voltage1500V Forward current 5.0A Features · µÍµÄ ·´ Ïò© µç Á÷ Low reverse leakage ÌØ Õ÷ .052(1.3) DIA .048(1.2) ·´ Ïò µçѹ 1500 V Õý Ïò µçÁ÷ 5.0 A DO-27 1.0(25.4) MIN · ½ÏÇ¿ µÄ Õý Ïò ÀË Ó¿ ³ÐÊÜ ÄÜ Á¦ High forward surge capability .375(9.5) .335(8.5) .220(5.6) DIA .197(5.0) 1.0(25.4) MIN · ¸ßκ¸ ½Ó ±£Ö¤ High temperature soldering guaranteed: 250¡æ /10 Ãë , 0.375" (9.5mm)Òý Ïß ³¤ ¶È ¡£ 250¡æ /10 seconds, 0.375" (9.5mm) lead length, · Òý Ïß ¿É ³ÐÊÜ 5 °õ (2.3kg) À-Á¦¡£ 5 lbs. (2.3kg) tension »ú еÊý ¾Ý Mechanical Data Unit£ºinch£¨ mm£© · ¶Ë ×Ó : ¶Æ Îý Öá Ïò Òý Ïß Terminals: Plated axia [ ... ]

TE2515 PDF Datasheet Download