This part is a kind of semiconductor called 1SMB5920A.

Function of this product has Silicon Zener Diodes.

Manufacturers : LGE

Image and pinout :

Some of the text within the PDF file :

Features * Complete Voltage Range 3.3 to 200 Volts * High peak reverse power dissipation * High reliability * Low leakage current Mechanical Data * Case : SMB (DO-214AA) Molded plastic * Epoxy : UL94V-O rate flame retardant * Lead : Lead formed for Surface mount * Polarity : Color band denotes cathode end * Mounting position : Any * Weight : 0.093 gram MAXIMUM RATINGS Rating at 25 °C ambient temperature unless otherwise specified 1SMB5913A-1SMB5957A Silicon Zener Diodes VZ : 3.3 - 240 Volts PD : 1.5 Watts SMB (DO-214AA) 1.1 ± 0.3 5.4 ± 0.15 4.8 ± 0 . 1 5 2.0 ± 0.1 3.6 ± 0.15 2.3 ± 0.2 0.22 ± 0.07 Dimensions in millimeter Rating DC Power Dissipation at TL = 75 °C (Note1) Maximum Forward Voltage at IF = 200 mA Junction Temperature Range Storage Temperature Range Symbol PD VF [ ... ]

1SMB5920A PDF Datasheet Download