This part is a kind of semiconductor called 1N5406.
Function of this product has 3.0 Ampere General Purpose Rectifiers.
Manufacturers : Fairchild Semiconductor
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Some of the text within the PDF file :
1N5401 - 1N5408 — General-Purpose Rectifiers August 2015 1N5401 - 1N5408 General-Purpose Rectifiers Features • 3.0 A Operation at TA = 75°C with No Thermal Runaway • High Current Capability • Low Leakage Ordering Information Part Number 1N5401 1N5402 1N5404 1N5406 1N5408 Top Mark 1N5401 1N5402 1N5404 1N5406 1N5408 DO-201AD COLOR BAND DENOTES CATHODE Package DO-201AD DO-201AD DO-201AD DO-201AD DO-201AD Packing Method Tape and Reel Tape and Reel Tape and Reel Tape and Reel Tape and Reel Absolute Maximum Ratings Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above [ ... ]