This part is a kind of semiconductor called 1N5404.

Function of this product has 3.0A SILICON RECTIFIER.

Manufacturers : Won-Top Electronics

Image and pinout :

Some of the text within the PDF file :

W TE POWER SEMICONDUCTORS Features ! Diffused Junction ! Low Forward Voltage Drop ! High Current Capability ! High Reliability ! High Surge Current Capability Mechanical Data ! Case: Molded Plastic ! Terminals: Plated Leads Solderable per MIL-STD-202, Method 208 ! Polarity: Cathode Band ! Weight: 1.2 grams (approx.) ! Mounting Position: Any ! Marking: Type Number ! Epoxy: UL 94V-O rate flame retardant 1N5400 – 1N5408 3.0A SILICON RECTIFIER AB A D DO-201AD Dim Min Max A 25.4 — B 8.50 9.50 C 1.20 1.30 D 5.0 5.60 All Dimensions in mm C Maximum Ratings and Electrical Characteristics @TA=25°C unless otherwise specified Single Phase, half wave, 60Hz, resistive or inductive load. For capacitive load, derate current by 20%. Characteristic Symbol Peak Repetitive Reverse Voltage Workin [ ... ]

1N5404 PDF Datasheet Download