SC-70-4 footprint, two-rail supervisor
The MAX6389XS23D3+ is a dual-voltage power supply monitor in a SC-82A / SOT-343 package, supplied as SC-70-4. It tracks two independent voltage rails with a threshold of 2.31 V on one channel and an adjustable threshold on the second, issuing an active-low reset when either rail drops below its trip point. The open-drain output stays asserted for a minimum of 140 ms after all monitored voltages rise above threshold, giving the downstream processor time to stabilise before release. Rated for -40°C to 125°C ambient, this monitor suits industrial and automotive environments where the board sees wide thermal swings.
Active production, no cross-reference on record
The MAX6389XS23D3+ carries an active lifecycle status — the manufacturer continues to support new orders through authorised channels. No official second-source or pin-compatible successor is listed; the BOM line depends on this specific Maxim order code.