This part is a kind of semiconductor called 1N5809.

Function of this product has SUPERFAST RECTIFIER DIOSE.

Manufacturers : Semtech

Image and pinout :

Some of the text within the PDF file :

RECTIFIER, up to 150V, 6A, 30ns 1N5807 1N5809 1N5811 TEL:805-498-2111 FAX:805-498- 3804 WEB:http://www.semtech.com MECHANICAL G112 Dimensions DIM N Millimeters MIN MAX Inches MIN MAX Note A 2.92 3.61 .115 0.142 B 22.9 33.0 0.90 1.30 C 3.3 7.62 .130 0.3 D - 0.80 - .030 E 0.91 1.07 0.036 .042 1 - Note: (1) Lead diameter uncontrolled over this region. Weight = 0.013oz MIL-PRF-19500/477 and are prefered parts as listed in MIL-STD-701. They can be supplied fully released as JANTX, JANTXV, and JANS versions RECTIFIER, up to 150V, 6A, 30ns 1N5807 1N5809 1N5811 22 RECTIFIER, up to 150V, 6A, 30ns 1N5807 1N5809 1N5811 [ ... ]

1N5809 PDF Datasheet Download