This part is a kind of semiconductor called 1N1184A.
Function of this product has STANDARD RECOVERY RECTIFIERS.
Manufacturers : Digitron Semiconductors
Image and pinout :
Some of the text within the PDF file :
1N1183-1N1190, 1N3765-1N3768 High-reliability discrete products and engineering services since 1977 STANDARD RECOVERY RECTIFIERS FEATURES Available as “HR” (high reliability) screened per MIL-PRF-19500, JANTX level. Add “HR” suffix to base part number. Available as non-RoHS (Sn/Pb plating), standard, and as RoHS by adding “-PBF” suffix. MAXIMUM RATINGS Characteristics Average forward current Maximum surge current Maximum I2t for fusing Maximum peak forward voltage Maximum peak reverse current Maximum peak reverse current Maximum thermal resistance Maximum recommended operating frequency Storage temperature range Operating junction temperature range *Pulse test: Pulse width 300µsec. Duty cycle 2% Symbol IF(AV) IFSM I2t VFM IRM IRM RθJC Tstg TJ 40 Amps 800 Amps 26 [ ... ]