This part is a kind of semiconductor called 2N6505.

Function of this product has SILICON CONTROLLED RECTIFIERS.

Manufacturers : Digitron Semiconductors

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2N6504-2N6509 High-reliability discrete products and engineering services since 1977 SILICON CONTROLLED 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 Rating Symbol Value Unit Peak repetitive off state voltage (1) (Gate open, sine wave 50 to 60 Hz, TJ = 25° to 125°C) 2N6504 2N6505 2N6507 2N6508 2N6509 VDRM, VRRM 50 100 400 600 800 V On-state current RMS (180° conduction angles; TC = 85°C) IT(RMS) 25 A Average on-state current (180° conduction angles; TC = 85°C) IT(AV) 16 A Peak non-repetitive surge current (1/2 cycle, sine wave 60 Hz, TJ = 100°C ITSM 250 A [ ... ]

2N6505 PDF Datasheet Download