12V 1Watt Zener Diode 1N4742A SEMTECH

The 1N4742A is a 12V, 1W silicon planar Zener diode manufactured by Semtech for high-reliability voltage regulation and transient voltage suppression. Housed in a hermetically sealed, axial-leaded DO-41 glass package, this discrete component ensures a standard tight voltage tolerance of 5%. It operates at a nominal Zener breakdown voltage of 12V under a 21 mA test current while maintaining a maximum dynamic loop impedance of 9 ohms. Engineered for robust power handling, this device delivers stable electrical performance across a wide operating temperature range from minus 65 to plus 175 degrees Celsius.