Two-rail sequencer with nine threshold presets
The MAX16025TE+T from Analog Devices (formerly Maxim Integrated) is a power-supply sequencer that monitors two voltage rails and asserts an active-low, open-drain reset output when any monitored voltage falls below its threshold. The reset timeout is 140 ms fixed or adjustable via an external capacitor, giving the downstream load time to stabilize after all rails are valid. Nine selectable threshold combinations cover common core and I/O voltages (e.g., 0.9 V, 1.8 V, 2.5 V, 3.3 V, 5 V) without external resistor dividers, which simplifies the BOM and saves board area.
140 ms reset timeout — what it buys you
The 140 ms minimum reset timeout is long enough to cover the power-up settling of most switching regulators and LDOs in a two-rail system. If your load needs a different delay, the adjustable option lets you stretch it with a single capacitor. The active-low open-drain output is compatible with 1.8 V, 2.5 V, or 3.3 V logic — just add a pull-up resistor to the appropriate rail.
Package and footprint
Housed in a 16-TQFN (4x4 mm) with an exposed pad, the MAX16025TE+T is a surface-mount device. The exposed pad must be soldered to the PCB ground plane for thermal relief — without a via stitch under the pad, the junction temperature can exceed the 125°C rating under continuous load. The 4x4 mm footprint is compact enough for space-constrained designs like base-station line cards or industrial sensor nodes.
Temperature grade and environment
Rated for -40°C to 125°C ambient, this part suits outdoor telecom cabinets, engine-bay electronics, and factory-floor automation where the ambient can swing from cold start to self-heating near the enclosure roof. The wide temperature range also covers most automotive under-hood applications that do not require formal AEC-Q100 qualification.
Lifecycle and sourcing
The MAX16025TE+T is an active, current-production part per the manufacturer's status. It is ROHS3 compliant. For BOM planning, this part carries no imminent obsolescence risk and can be specified into new designs with confidence.