This part is a kind of semiconductor called C4237.

Function of this product has 2SC4237.

Manufacturers : Shindengen Electric

Image and pinout :

Some of the text within the PDF file :

SHINDENGEN Switching Power Transistor HFX Series (T10W80HFX) 10A NPN 2SC4237 OUTLINE DIMENSIONS Case : MTO-3P Unit : mm RATINGS ●Absolute Maximum Ratings Item Storage Temperature Junction Temperature Collector to Base Voltage Collector to Emitter Voltage Emitter to Base Voltage Collector Current DC Collector Current Peak Base Current DC Base Current Peak Total Transistor Dissipation Mounting Torque Symbol Tstg Tj VCBO VCEO VEBO IC ICP IB IBP PT TOR Conditions Tc = 25℃ (Recommended torque : 0.5N･m) Ratings -55～150 150 1200 800 7 10 20 4 8 150 0.8 Ratings Min 800 Max 0.1 Max 0.1 Max 0.1 Min 8 Min 5 Max 1.0 Max 1.5 Max 0.83 TYP 8 Max 0.5 Max 3.5 Max 0.3 Unit ℃ ℃ V V V A A W N･m ●Electrical Characteristics (Tc=25℃) Item Symbol Collector to Emitt [ ... ]

C4237 PDF Datasheet Download