This part is a kind of semiconductor called 1N5819.

Function of this product has 1.0 Ampere Schottky Barrier Rectifiers.

Manufacturers : Fairchild Semiconductor

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Some of the text within the PDF file :

1N5817-1N5819 Discrete POWER & Signal Technologies 1N5817 - 1N5819 Features • • 1.0 ampere operation at TA = 90°C with no thermal runaway. For use in low voltage, high frequency inverters free wheeling, and polarity protection applications. 1.0 min (25.4) Dimensions in inches (mm) 0.205 (5.21) 0.160 (4.06) DO-41 COLOR BAND DENOTES CATHODE 0.107 (2.72) 0.080 (2.03) 0.034 (0.86) 0.028 (0.71) 1.0 Ampere Schottky Barrier Rectifiers Absolute Maximum Ratings* Symbol IO if(surge) PD RθJA Tstg TJ TA = 25°C unless otherwise noted Parameter Average Rectified Current .375 " lead length @ TA = 90°C Peak Forward Surge Current 8.3 ms single half-sine-wave Superimposed on rated load (JEDEC method) Total Device Dissipation Derate above 25°C Thermal Resistance, Junction to Ambient Storage T [ ... ]

1N5819 PDF Datasheet Download