View 1sma4728a 1sma4764a series datasheet:

1SMA4728A-1SMA4764A Surface Mount Zener Diodes VZ : 3.3 - 100Volts PD : 1 Watt SMA Features Complete voltage range 3.3 to 100 volts High peak reverse power dissipation 1.3 ± 0.2 High reliability Low leakage current Standard zener voltage tolerance is ± 5%. Pb / RoHS Free 1.6 ± 0.25 Mechanical Data 2.3 ± 0.2 2.6 ± 0.15 Case : SMA Molded plastic Epoxy : UL94V-O rate flame retardant Polarity : Color band denotes cathode end 1.6 ± 0.25 Mounting position : Any Weight : 0.060 gram (Approximately) Dimensions in millimeters MAXIMUM RATINGS Rating at 25 °C ambient temperature unless otherwise specified Rating Symbol Value Unit DC Power Dissipation at TL = 75 °C (Note1) PD 1.0 W Maximum Forward Voltage at IF = 200 mA VF 1.2 V TJ Junc