This part is a kind of semiconductor called 1N4466.

Function of this product has (1N4460 - 1N4496) SILICON ZENER DIODES.

Manufacturers : EIC discrete Semiconductors

Image and pinout :

Some of the text within the PDF file :

Certificate TH97/10561QM Certificate TW00/17276EM 1N4460 - 1N4496 and 1N6485 - 1N6491 VZ : 3.3 - 200 Volts PD : 1.5 Watts FEATURES : * Silicon power zener diodes * Complete Voltage Range 3.3 to 200 Volts * High peak reverse power dissipation * High reliability * Low leakage current * Pb / RoHS Free SILICON ZENER DIODES M1A 0.085(2.16) 0.075(1.91) 1.00 (25.4) MIN. 0.138(3.51) 0.122(3.10) MECHANICAL DATA : * Case : M1A Molded plastic * Epoxy : UL94V-O rate flame retardant * Lead : Axial lead solderable per MIL-STD-202, method 208 guaranteed * Polarity : Color band denotes cathode end * Mounting position : Any * Weight : 0.20 gram (approximately) 0.024(0.60) 0.022(0.55) 1.00 (25.4) MIN. Dimensions in inches and ( millimeters ) MAXIMUM RATINGS (Rating at 25 °C ambient temperature [ ... ]

1N4466 PDF Datasheet Download