This part is a kind of semiconductor called 1N3209.
Function of this product has STANDARD RECOVERY DIODE.
Manufacturers : DACO SEMICONDUCTOR
Image and pinout :
Some of the text within the PDF file :
DACO SEMICONDUCTOR CO., LTD. 1N3208(R) THR U 1N3214A(R) STANDARD RECOVERY DIODE STUD TYPES 15A Features High Surge Capability Types Up to 600V VRRM 15 Amp Recti er 50-600 Volts Maximum Ratings Operating Temperature: -55 C to +175 Storage Temperature: -55 C to +175 Part Number 1N3208(R) 1N3209(R) 1N3210(R) 1N3211(R) 1N3212(R) 1N3213(R) 1N3214(R) Maximum Recurrent Peak Reverse Voltage 50V 100V 200V 300V 400V 500V 600V Maximum RMS Voltage 35V 70V 140V 212V 280V 354V 420V Maximum DC Blocking Voltage 50V 100V 200V 300V 400V 500V 600V P A DO-5 J K D G FE B N C Notes : 1.Standard Polarity Stud is Cathod 2.Reverse Polarity: Stud is Anode Electrical Characteristics @ 25 Average Forward Current (Per pkg) IF(AV) Peak F orward Sur ge Cur rent Maximum IFSM Instantaneous Forward Vo [ ... ]