Single comparator with a built-in 1.182V reference — one less BOM line to manage
The MAX931ESA+ from Maxim Integrated is a single, low-power comparator that integrates a precision voltage reference on-chip. That means you get the threshold-setting circuit and the comparator in one 8-SOIC package — no external reference diode, no resistor divider for the trip point. The reference is laser-trimmed to 1.182V nominal, and the comparator delivers CMOS/TTL-compatible output levels. Typical use cases: battery-voltage monitoring, overvoltage/undervoltage detection, window comparators, and threshold alarms in industrial control or portable instrumentation.
4 µA quiescent current — the spec that keeps the battery alive
Quiescent current maxes out at 4 µA. The output sinks 0.015 mA typical at 5V.
50 mV hysteresis — no external feedback, no chatter
Built-in 50 mV hysteresis eliminates the need for external positive-feedback resistors. Propagation delay is 12 µs max.
Industrial temperature grade, but no automotive qualification
Rated -40°C to +85°C, this part is at home on a factory-floor PLC card, an outdoor telecom enclosure, or a portable instrument. It is not AEC-Q100 qualified, so it does not belong in an under-hood automotive ECU or a safety-critical chassis-domain controller. For those environments, look for a comparator in the same function family that carries explicit automotive-grade approval.
Sourcing and lifecycle: active, ROHS3, available to order
Lifecycle status is Active per the manufacturer, and the part is ROHS3 compliant. No end-of-life notice or last-time-buy window has been issued. Sourced and quoted to order through independent distribution.