MAX6331SUR-T

Overview

The MAX6331SUR-T is a precision shunt regulator with an active-high power-on reset function in a SOT23-3 package. It regulates the SHUNT pin to 3.0V with ±1.5% tolerance and provides a non-inverting RESET output. The device operates from -40°C to +85°C, supports a shunt current range of 100µA to 50mA, and features a 140ms reset timeout period without external components.

Feature Summary

• Combines a precision shunt voltage reference with a microprocessor supervisory circuit in a single compact package.
• Provides an active-high push/pull reset output that remains asserted during power-up, power-down, and brownout conditions.
• Offers high transient immunity against short-duration negative-going voltage glitches on the regulated supply line.

Applications

• Controllers
• Household Appliances
• Intelligent Instruments
• Critical µP and µC Power Monitoring
• Portable/Size-Sensitive Equipment

Procurement Notes

Verify the specific suffix letter (S) for the 3.0V shunt voltage configuration when ordering. Confirm lead-free packaging status by checking for the +T designation if required. Ensure the minimum order increment of 2,500 pieces aligns with procurement requirements. Cross-reference the top marking EPAA to validate the component authenticity upon receipt.

Selection Notes

Select this part for applications requiring simultaneous voltage regulation and system supervision in space-constrained designs. The active-high output suits microprocessors expecting a logic high signal after initialization. Verify that the load current does not exceed the maximum shunt current capability of 50mA while maintaining the minimum 100µA shunt current for stable regulation.

Part Context

This component belongs to the MAX6330/MAX6331 family of precision shunt regulators with integrated reset functions. The MAX6331 variant specifically provides an active-high reset output, contrasting with the MAX6330's active-low output. Both share identical shunt regulator specifications and package options, differing only in the polarity of the supervisory signal provided to the monitored system.

Replacement Considerations

Direct functional replacements within the same family include the MAX6330SUR-T, which offers an active-low reset output instead of active-high. Other variants such as MAX6331LUR-T and MAX6331TUR-T provide different regulated voltages (5.0V and 3.3V respectively) but maintain the same package and reset timing characteristics.