This part is a kind of semiconductor called B4S.

Function of this product has Glass passivated type.

Manufacturers : Formosa MS

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Some of the text within the PDF file :

Surface mount bridge Rectifier B05S THRU B10S Glass passivated type Formosa MS TO-269AA Features Plastic package has Underwriters Laboratory Flammability Classification 94V-O Utilizing Flame Retardant Epoxy M olding Compound. For surface mounted applications. Exceeds environmental standards of MIL-S-19500 / 228 Glass pas sivated junction ~ + .165(4.2) .150(3.8) ~ .008(0.2) .275(7.0) MAX .043(1.1) .027(0.7) .106(2.7) .090(2.3) .031(0.8) .019(0.5) .193(4.9) .177(4.5) .106(2.7) .090(2.3) Mechanical data Dimensions in inches and (millimeters) Case : Molded plastic, JEDEC TO-269AA Terminals : Solder plated, solderable per MIL-STD-750, Method 2026 Polarity : marked on body Mounting P osition : Any Weight : 0.22 gram MAXIMUM RATINGS (AT TA=25oC unless otherwise noted) PARAMETER Forward [ ... ]

B4S PDF Datasheet Download