This part is a kind of semiconductor called BF451.Function of this product has (BF450 / BF451) HF Silicon Planar Epitaxial Transistor. Manufacturers : NXP Image and pinout : Some of the text within the PDF file : [ ... ] BF451 PDF Datasheet Download Metablog 2017/10/12 12:32 2017/10/12 12:32