Four bidirectional channels in a SOT-23-6 — what it buys the layout
The STMicroelectronics ESDA6V1-4BC6 is a Zener-based transient-voltage suppressor array in the ESDA / TRANSIL™ series, packing four bidirectional channels into a single SOT-23-6 package. Each channel provides a 6.1V minimum breakdown voltage and a 3V maximum reverse standoff, meaning a 3.3V or 2.5V signal rail can sit on the protected line without forward-biasing the diode. The 80W peak pulse power (8/20 µs waveform) is sized for ESD strikes and low-energy transients, not mains surges — typical for I/O port protection on HDMI, USB, Ethernet magnetics, or general-purpose digital lines in industrial and telecom gear.
Surface-mount SOT-23-6 footprint matches the standard 6-pin SC-74 layout; the bidirectional structure means no orientation worries during pick-and-place — each channel clamps symmetrically on both polarities.
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