This part is a kind of semiconductor called TF361M-A.

Function of this product has TO-220 3A High sensitive Thyristor.

Manufacturers : Sanken electric

Image and pinout :

Some of the text within the PDF file :

TO-220 3A High sensitive Thyristor TF321M-A, TF341M-A, TF361M-A s Features qRepetitive peak off-state voltage: VDRM=200, 400, 600V qAverage on-state current: IT(AV)=3A qHigh sensitive Gate trigger Current: IGT=0.1mA max External Dimensions (Unit: mm) 16.7max 0.2 3.0±0.2 8.8± 10.4max 5.0max 2.1max φ 3.75±0.1 a b ± 1.35 0.15 12.0 min 4.0 max +0.2 0.65 – 0.1 ± 2.5 0.1 (1). Cathode (K) (2). Anode (A) (3). Gate (G) ± 2.5 0.1 ± 1.7 0.2 a. Part Number b. Lot Number (1) (2) (3) Weight: Approx. 2.6g sAbsolute Maximum Ratings Parameter Repetitive peak off-state voltage Repetitive peak reverse voltage Non-repetitive peak off-state voltage Non-repetitive peak reverse voltage Average on-state current RMS on-state current Surge on-state current Peak forward gate current Peak forwa [ ... ]

TF361M-A PDF Datasheet Download