MAX6331SUR+

Overview

The MAX6331SUR+ is a precision shunt regulator with an active-high reset output in a SOT23-3 package. It regulates the shunt voltage to 3.0V with ±1.5% tolerance and operates over a wide current range of 100µA to 50mA. The integrated power-on reset function provides a fixed 140ms timeout period without external components. The device monitors supply voltages, asserting the reset signal during power-up, power-down, or brownout conditions to protect microprocessor systems.

Feature Summary

• Combines a precision shunt regulator with a power-on reset function in a single compact package
• Provides active-high push/pull reset output for reliable logic interfacing
• Offers low-cost protection against power-up, power-down, and brownout conditions
• Features high transient immunity and stable regulation across a wide operating temperature range

Applications

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

Procurement Notes

Verify the specific suffix 'S' corresponds to the required 3.0V shunt voltage threshold before procurement. Confirm that the lead-free '+T' designation aligns with environmental compliance requirements. Ensure the minimum order increment of 2,500 pieces is accounted for in purchasing plans. Validate that the SOT23-3 footprint matches the target PCB layout constraints.

Selection Notes

Select this component when a combined voltage regulation and reset function is needed in a space-constrained design. The active-high output suits systems requiring non-inverting reset signals. Verify that the load current remains within the 100µA to 50mA shunt range to maintain stability. Consider thermal derating if operating at high ambient temperatures or maximum shunt currents.

Part Context

This part belongs to the MAX6330/MAX6331 family of precision shunt regulators with reset functions. The MAX6331 variant specifically features an active-high reset output, contrasting with the MAX6330's active-low output. Both share identical shunt regulator characteristics but differ in reset polarity to accommodate various microprocessor interface requirements.

Replacement Considerations

Direct replacements include other MAX6331 variants with different shunt voltages (e.g., MAX6331TUR+ for 3.3V) or the MAX6330 series for active-low reset needs. Cross-reference pinouts and electrical characteristics to ensure compatibility with existing circuit designs.