MAX6337US18D3-T

Overview

The MAX6337US18D3-T is a microprocessor supervisory circuit manufactured by Analog Devices Inc./Maxim Integrated. It monitors power supplies in 1.8V to 3.3V systems, asserting a reset signal when VCC declines below the preset threshold or upon manual reset assertion. The device features an active-low open-drain RESET output and includes a debounced manual-reset input. It operates within a supply voltage range of 0.7V to 5.5V, with a typical operating current of 3.3µA. The component is housed in a SOT-143-4 surface-mount package and supports an extended industrial temperature range from -40°C to +125°C.

Feature Summary

• Active-low open-drain reset output for flexible logic interfacing
• Debounced manual-reset input to prevent false triggering
• Ultra-low supply current consumption for power efficiency
• Guaranteed correct reset state down to 0.7V supply voltage

Applications

• Microprocessor (µP) power supply monitoring
• Digital system voltage supervision
• Battery-powered portable devices
• Space-critical embedded applications

Procurement Notes

Verify the specific suffix D3 indicates the 1.8V threshold variant against the official datasheet. Confirm the 'T' suffix denotes tape-and-reel packaging if required for automated assembly. Check current availability status as this part may be discontinued or subject to supply limitations. Ensure RoHS compliance documentation matches project requirements.

Selection Notes

Select this component when an active-low open-drain output is preferred over push-pull configurations. It is suitable for systems requiring precise monitoring of 1.8V rails with minimal quiescent current. Consider the SOT-143-4 package size for space-constrained designs. Verify that the 0.7V guaranteed operating voltage meets the lowest expected supply rail conditions.

Part Context

This part belongs to the MAX6335/MAX6336/MAX6337 family of ultra-low-voltage, low-power µP reset circuits. While the MAX6335 offers an active-high push-pull output and the MAX6336 provides an active-low push-pull output, the MAX6337 specifically provides an active-low open-drain output. All three share similar monitoring capabilities and package options but differ in output stage architecture.

Replacement Considerations

Public confirmed substitutes include MAX6337US19D3-T, MAX6337US23D3-T, and MAX6337US25D3-T for different voltage thresholds. For alternative outputs, consider MAX6336US18D3-T (push-pull) or MAX6335US18D3-T (active-high). Verify pinout compatibility and electrical specifications before substitution.