MAX9040AEUK+T

Overview

The MAX9040AEUK+T is a micropower, single-supply comparator and precision voltage reference IC manufactured by Analog Devices Inc. (Maxim Integrated). It operates within a supply voltage range of 2.5V to 5.5V and consumes only 40μA of quiescent supply current. The device integrates a single comparator with rail-to-rail inputs and outputs, alongside a fixed 2.048V A-grade voltage reference featuring ±0.4% initial accuracy and a typical temperature coefficient of 6ppm/°C. Packaged in a 5-pin SOT-23 format, it supports an operating temperature range from -40°C to +85°C.

Feature Summary

• Integrates a single low-power comparator with a precision voltage reference in a compact footprint
• Features rail-to-rail input and output stages capable of sinking and sourcing up to 8mA
• Includes internal hysteresis to ensure clean switching for slow-moving signals
• Utilizes a unique output stage design that minimizes supply current surges during transitions

Applications

• Precision battery management systems
• Window comparator circuits
• IR receivers
• Level translators
• Digital line receivers

Procurement Notes

Verify the specific suffix '+T' indicates tape-and-reel packaging when ordering. Confirm the 'A' grade designation corresponds to the required 0.4% initial accuracy and 6ppm/°C temperature coefficient specifications. Ensure the SOT-23 package dimensions align with the target PCB layout constraints before finalizing procurement.

Selection Notes

Select this component for applications requiring both signal comparison and a stable reference voltage within a minimal space. It is suitable for 3V and 5V systems where low power consumption is critical. Consider the rail-to-rail capability if interfacing with various logic levels. Verify that the 400ns propagation delay meets the timing requirements of the specific application.

Part Context

This part belongs to the MAX9038–MAX9043/MAX9050–MAX9053 family of micropower comparators and references. While other variants offer dual comparators or different reference voltages like 1.23V or 2.5V, the MAX9040 specifically provides a 2.048V reference. It shares the same low-power architecture and package options as its siblings but is optimized for single-comparator designs.

Replacement Considerations

Direct functional substitutes within the same family include the MAX9040BEUK+T, which offers B-grade reference accuracy. Other packages such as UCSP or SO are available for the same electrical function. Cross-family replacements require verification of pin compatibility and reference voltage matching.