This part is a kind of semiconductor called 1N757.

Function of this product has 0.5W Silicon Planar Zener Diodes.

Manufacturers : Micro Commercial Components

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Some of the text within the PDF file :

MCC Features • • •
  omponents 21201 Itasca Street Chatsworth    !"# $ %    !"# 1N746 THRU 1N759 Zener Voltage 3.3V to 12V Silicon Planar Power Zener Diodes Standards zener voltage tolerance is ±10% , Add suffix “A” for ±5% tolerance, other tolerances are available upon request 0.5W Silicon Planar Zener Diodes • • • Mechanical Data Case: DO-35 glass case Polarity: Color band denotes cathode end Weight: Approx. 0.13 gram DO-35 Maximum Ratings Symbol Zener Current Power Dissipation @ T A=50oC Junction Temperature Storage Temperature Range Ptot TJ TSTG Value See Table 1 500 175 -65 to 175 Units mW o o D C C A Cathode Mark B D Electrical Characteristics @ 25°C Unless Otherwise Specified Symbol Thermal resistan [ ... ]

1N757 PDF Datasheet Download