This part is a kind of semiconductor called 2N5581.
Function of this product has Silicon NPN Transistor.
Manufacturers : Semicoa Semiconductor
Image and pinout :

Some of the text within the PDF file :
2N5581 Silicon NPN Transistor Data Sheet Description Semicoa Semiconductors offers: • Screening and processing per MIL-PRF-19500 Appendix E • JAN level (2N5581J) Applications • General purpose switching • Low power • NPN silicon transistor • JANTX level (2N5581JX) • JANTXV level (2N5581JV) • QCI to the applicable level • 100% die visual inspection per MIL-STD-750 method 2072 for JANTXV • Radiation testing (total dose) upon request Features • • • • Please contact Semicoa for special configurations www.SEMICOA.com or (714) 979-1900 Hermetically sealed TO-46 metal can Also available in chip configuration Chip geometry 0400 Reference document: MIL-PRF-19500/423 Benefits • Qualification Levels: JAN, JANTX, and JANTXV • Radiation testing av [ ... ]
2N5581 PDF Datasheet Download
