What this ORing controller does on your power rail
The Analog Devices MAX5943EEEE+ is an N+1 ORing controller designed to replace Schottky diode ORing in redundant power-supply architectures. It drives an external N-channel MOSFET to steer current from the active supply rail and blocks reverse current when that supply fails or is shorted. The part is rated for FireWire applications but suits any redundant 7.5V to 37V bus — telecom, industrial, or point-of-load distribution where a diode drop costs too much heat and voltage headroom.
100 ns turn-off — why it matters for fault blocking
The 100 ns turn-off delay is the time from sensing a reverse-current condition to pulling the FET gate low. In a 24V system with a shorted input, every nanosecond of delay lets the output capacitor dump energy backward through the FET.
Supply range and temperature — where it lives on the board
Operating from 7.5V to 37V, the MAX5943EEEE+ covers the common 12V and 24V industrial rails with margin for transients. The -40°C to 85°C industrial temperature range means it is at home in a motor drive cabinet, an outdoor base station, or an engine-bay ECU — not just an air-conditioned rack. No internal switch means the external FET selection is up to you; the controller just handles the gate drive and fault sensing.
Package and footprint for the layout engineer
Housed in a 16-QSOP (3.90 mm wide SSOP body), this is a fine-pitch surface-mount part. The 0.154-inch body width is standard for SSOP-16, so the footprint matches any generic SSOP-16 land pattern.
Lifecycle and sourcing posture
The MAX5943EEEE+ carries an Active lifecycle status and is RoHS3 compliant.