This post explains for the semiconductor D1351.
The Part Number is 2SD1351.
The function of this semiconductor is NPN Power Transistor.
The manufacturers of this product is JMnic.
See the preview image and the PDF file for more information.
Preview images :
1. With TO-220C package
2. Complement to type 2SB988
3. Low saturation voltage : VCE(sat)=1.0V(Max.)(IC=2.0A,IB=0.2A)
·For general purpose application