Zener ESD clamp for signal-line protection
The ESD9X12ST5G is a single-channel Zener-type ESD suppressor from onsemi, designed to clamp fast transients on general-purpose signal lines. Its 12V (max) reverse standoff voltage and 13.5V minimum breakdown define the trigger window for a 23.7V clamping ceiling at the rated peak pulse current. Rated for 140W peak pulse power with a 5.9A (8/20µs) peak pulse current capability, this part handles the energy from typical ESD strikes and cable discharge events without exceeding the junction temperature limit of 150°C.
Capacitance and signal integrity
With 30pF capacitance measured at 1MHz, the ESD9X12ST5G adds minimal loading to high-speed data lines such as USB 2.0, HDMI, or LVDS interfaces. This capacitance value keeps signal edge degradation low enough for most general-purpose and moderate-speed digital buses.
The product status is Active, meaning onsemi continues to manufacture and supply this ordering code without an announced end-of-life.