Rail-to-rail steering diode for 3.3V data lines
The CM1213A-01SO is a single-channel steering (rail-to-rail) ESD protection diode from onsemi, designed to clamp transients on 3.3V signal or power rails. Its 10V typical clamping voltage at 1A (8/20µs) keeps downstream ICs within safe limits during an ESD event. Packaged in a standard SOT-23-3 (TO-236) footprint, it suits general-purpose ESD protection on USB, HDMI, or other high-speed interfaces where low capacitance is needed to preserve signal integrity.
Last Buy — plan your final order
onsemi has marked the CM1213A-01SO as Last Buy. This is the final production window — once inventory is exhausted, the part will not be manufactured again. Procurement should commit to a lifetime buy quantity against the BOM forecast.
SOT-23-3 footprint and layout fit
The SOT-23-3 package (also known as TO-236 or SC-59) is a three-lead surface-mount package. It is a common footprint shared by many ESD diodes and small-signal transistors, making board-level replacement straightforward if the board was laid out for this package.