MAX9031AXK-T

Overview

The MAX9031AXK+T is a single-channel analog comparator from the MAX9030/MAX9031/MAX9032/MAX9034 family, manufactured by Analog Devices Inc./Maxim Integrated. It operates on a single supply voltage ranging from +2.5V to +5.5V and consumes a typical supply current of 35µA per comparator across an operating temperature range of -40°C to +125°C. The device features a propagation delay of 188ns (typical) with a maximum of 228ns, an input offset voltage of ±1mV (max), and an input bias current of 8nA (typical). It utilizes a push-pull output stage that swings rail-to-rail and includes built-in 4mV hysteresis for noise immunity.

Feature Summary

• Rail-to-rail push-pull output stage reduces switching current during transitions to minimize power-supply glitches
• Internal 4mV hysteresis provides noise immunity and prevents oscillations with slow-moving input signals
• No phase reversal occurs for overdriven inputs, ensuring stable operation under extreme conditions

Applications

• Battery-powered portable systems
• Mobile communications devices
• Sensor signal detection circuits
• Photodiode preamplifier interfaces
• Digital line receivers and threshold detectors

Procurement Notes

Verify the specific suffix 'K' corresponds to the SC70 package variant when sourcing. Confirm RoHS compliance status indicated by the '+' symbol in the part number. Ensure the ordering code matches the exact pin configuration required for the target PCB layout. Cross-reference the manufacturer's official documentation for any recent revisions or obsolescence notices before finalizing procurement plans.

Selection Notes

Select this component for applications requiring low-power consumption and ultra-small footprint integration. The single-channel configuration suits designs needing one comparator without shutdown functionality. Consider the 4mV internal hysteresis for basic noise filtering needs. Evaluate the 188ns propagation delay against system timing requirements. Verify compatibility with the +2.5V to +5.5V single-supply voltage range available in the target design.

Part Context

This part belongs to the MAX903x family of low-cost, ultra-small, single/dual/quad single-supply comparators. The MAX9031 specifically denotes the single-channel version without a shutdown pin, distinguishing it from the MAX9030 which includes shutdown capability. The family shares common electrical characteristics but varies in channel count and package options to accommodate different space and performance constraints in portable electronics.

Replacement Considerations

The MAX9031AUK+T serves as a pin-compatible alternative utilizing the SOT23-5 package instead of the SC70 package found in the AXK variant. Both parts share identical electrical specifications and functionality. Designers must verify the physical footprint differences between SC70 and SOT23-5 packages during replacement to ensure mechanical fit within the existing assembly.

FAQ

Does the MAX9031AXK+T include a shutdown pin?

No, the MAX9031 does not have a shutdown pin. Only the MAX9030 variant in this family includes a shutdown feature.

What is the input common-mode voltage range?

The input common-mode range extends from the negative supply (VSS) to within 1.1V of the positive supply (VDD).

How does the device handle overdriven inputs?

The comparator is designed to prevent phase reversal even when subjected to overdriven inputs, ensuring stable output behavior.