This part is a kind of semiconductor called SR540.

Function of this product has (SR520 - SR5200) Axial Lead Schottky Barrier Rectifiers.

Manufacturers : Weitron

Image and pinout :

Some of the text within the PDF file :

SR520 thru SR5200 Axial Lead Schottky Barrier Rectifiers P b Lead(Pb)-Free FEATURES: * Low forward voltage drop * High current capability, low forward voltage drop. * High surge capability. * Ultra high-speed switching. * Silicon epitaxial planar chip, metal silicon junction. * Lead-free parts meet environmental standards of MIL-STD-19500 /228 REVERSE VOLTAGE 20 TO 200 VOLTS FORWARD CURRENT 5.0 AMPERE MECHANICAL DATA: * Case: Molded plastic * Epoxy: UL 94V-0 rat retardant * Lead: Axial leads, solderable per MIL-STD-202, method 208 guranteed * Polarity: Cathode Band * Mounting position: Any * Weight: 1.071 grams DO-201AD DO-201AD Outline Dimensions Unit:mm DO-201AD 25.40 7.30 9.50 1.20 1.30 4.80 5.60 WEITRON http://www.weitron.com.tw 1/3 08-May-2012 Free Datasheet http://ww [ ... ]

SR540 PDF Datasheet Download