FJF Zener Diode SMD 18V 1W SOD-123 MM1W18 Jingdao Zener Diodes

The MM1W18 is an 18V, 1W surface-mount silicon planar Zener diode manufactured by Shandong Jingdao Microelectronics Co., Ltd. (Jingdao) for voltage regulation, voltage clamping, and overvoltage protection applications. Housed in a compact surface-mount SOD-123 molded plastic package, this discrete component features a single diode configuration designed with a low profile to optimize automated board placement. It operates with a nominal Zener breakdown voltage of 18V and a maximum power dissipation of 1W while carrying the package top-side marking code "FJF". Engineered with a maximum forward voltage drop of 1.2V at a 200mA test current and low reverse leakage, this robust device delivers reliable performance across an operating junction temperature range from minus 55 to plus 150 degrees Celsius.