The onsemi ESD5Z7.0T5G is a single-channel Zener ESD protection diode in a SOD-523 package. It clamps transients up to 200W peak pulse power with a 7V max reverse standoff — the typical call for protecting 5V or 3.3V data lines where the signal rides on a 7V rail. The 65pF capacitance at 1 MHz is low enough for USB 2.0 full-speed (12 Mbps) and most I2C/SPI buses, but you'll want to check the signal eye at 480 Mbps for USB 2.0 high-speed — that's where the 65pF starts loading the line.
Peak pulse power and clamping — what 200W buys you
The 200W peak pulse power is rated with an 8/20 µs waveform, which is the standard IEC 61000-4-5 surge shape. That's enough to survive a direct ESD strike at ±8 kV contact per IEC 61000-4-2 without the part failing short — the clamping voltage hits 22.7V max at the 8.8A peak pulse current. Don't put it on a Vcc bus expecting it to hold off a sustained overvoltage; it's designed for transient events only.
Cut Tape (CT) is also listed for prototype or low-volume builds.
SOD-523 footprint and temperature reach
Surface-mount in SC-79 / SOD-523 — the 0.60 mm body width fits tight layouts.