This part is a kind of semiconductor called BT137-600E.

Function of this product has TRIACS Thyristor.

Manufacturers : Kexin

Image and pinout :

Some of the text within the PDF file :

DIP Type Thyristor TRIACS Thyristor BT137-600E ■ Features ● Repetitive peak off-state voltages :600V ● RMS on-state current :8A ● Non-repetitive peak on-state current :65A T2 T1 G (1.70) 1.30 ± 0.10 TO-220 9.90 ± 0.20 (8.70) ø3.60 ± 0.10 9.20 ± 0.20 (1.46) (45 ) 13.08 ± 0.20 (1.00) 1.27 ± 0.10 123 1.52 ± 0.10 2.54TYP [2.54 ± 0.20 ] 0.80 ± 0.10 2.54TYP [2.54 ± 0.20 ] 10.00 ± 0.20 (3.00) (3.70) 15.90 ± 0.20 18.95MAX. 2.80 ± 0.10 10.08 ± 0.30 4.50 ± 0.20 1.30 +0.10 –0.05 0.50 +0.10 –0.05 2.40 ± 0.20 1 Main Terminal 1 2 Main Terminal 2 3 Gate ■ Absolute Maximum Ratings Ta = 25℃ Parameter Peak Repetitive Forward and Reverse Blocking Voltages RMS on-state Current @ full sine wave; Tmb ≤ 102 °C Non-Repetitive Peak on-state Current (t=20 [ ... ]

BT137-600E PDF Datasheet Download