MAX49140AXK/V+

Overview

The MAX49140AXK/V+T is a single high-speed comparator designed for 3V and 5V systems. It features a propagation delay of 30ns with 10mV overdrive and a typical supply current of 100μA at VDD = 3V. The device operates within a supply voltage range of 2.7V to 5.5V and supports an input common-mode voltage from 0V to VDD. It includes internal hysteresis of 1.2mV, an input offset voltage of 0.5mV (typ), and outputs that swing to within 0.3V of the rails. It is AEC-Q100 qualified and specified over an automotive temperature range of -40°C to +125°C in a 5-pin SC70 package.

Feature Summary

• Rail-to-rail input voltage range extending to both power-supply rails.
• Internal hysteresis ensures clean output switching without external resistors.
• CMOS and TTL-compatible outputs pull to within 0.3V of either supply rail.
• Continuous short-circuit fault tolerance on all input and output pins.

Applications

• Car battery-powered systems
• Line receivers
• Threshold detectors/discriminators
• Zero-crossing detectors
• Sampling circuits

Procurement Notes

Verify the specific suffix 'V+' indicates automotive qualification and RoHS compliance as defined in the ordering information. Confirm the 'T' suffix denotes tape and reel packaging. Ensure the component matches the exact pin configuration and thermal characteristics required for the target PCB layout. Cross-reference the datasheet revision date against manufacturing lot dates to ensure compatibility with current design specifications.

Selection Notes

Select this comparator when low power consumption and high speed are critical in portable or battery-operated equipment. The rail-to-rail inputs simplify interfacing with various signal sources. The integrated hysteresis reduces design complexity by eliminating the need for external feedback components. Verify that the load capacitance requirements align with the desired slew rate performance.

Part Context

This component belongs to the MAX49140 family of single-supply comparators. It is distinguished by its automotive qualification (AEC-Q100) and optimized performance for 3V and 5V logic interfaces. The device integrates protection circuitry and a current-driven output stage to maintain signal integrity while minimizing static power dissipation.

Replacement Considerations

Direct replacements must match the 5-pin SC70 package and electrical specifications. Verify that substitute parts offer comparable propagation delay and supply current ratings. Ensure any alternative components also support the required automotive temperature range if used in vehicle applications.

FAQ

How does the internal hysteresis function?

The device includes fixed internal hysteresis of 1.2mV, which creates two trip points to prevent oscillation caused by noise or slow-moving input signals, eliminating the need for external resistors.

What is the output drive capability?

The output stage is current-driven and can source or sink sufficient current to pull the output to within 0.3V of the supply rails without external pull-up or pull-down circuitry.