MAX6331TUR-T

Overview

The MAX6331TUR-T is a combined precision shunt regulator and power-on reset circuit in an SOT23-3 package. It provides a regulated 3.3V output with ±1.5% tolerance and monitors voltage for brownout conditions. The active-high RESET output asserts low when VSHUNT drops below the 3.06V threshold, remaining asserted for a 140ms timeout period after recovery. Operating supply current is minimal, supporting a wide shunt current range from 100µA to 50mA.

Feature Summary

• Combines a precision shunt voltage reference with a microprocessor supervisory function in a single compact package.
• Provides an active-high push/pull reset output that ensures reliable system initialization during power-up and brownout events.
• Offers high transient immunity and stable regulation across a broad load current range without requiring external adjustment components.

Applications

• Microcontroller and microprocessor power monitoring
• Portable and size-sensitive electronic equipment
• Household appliances and intelligent instruments

Procurement Notes

Verify the specific suffix 'T' indicates tape-and-reel packaging configuration. Confirm lead-free status by checking for the '+T' designation if required. Ensure the minimum order increment of 2,500 pieces aligns with procurement requirements. Validate the operating temperature range matches the application environment constraints before finalizing the purchase order.

Selection Notes

Select this component when board space is limited and both voltage regulation and reset supervision are needed. The active-high output suits systems requiring non-inverted reset signals. Verify that the 3.3V shunt voltage meets the downstream load requirements. Ensure the series resistor RS is calculated correctly to maintain shunt current within the 100µA to 50mA operational window under all expected load conditions.

Part Context

This device belongs to the MAX6330/MAX6331 family of precision shunt regulators with integrated reset functions. It serves as a cost-effective alternative to discrete solutions, reducing component count and board area. The family includes variants with different shunt voltages and reset polarities, designed for low-power microprocessor-based systems requiring robust power management.

Replacement Considerations

Direct functional substitutes include the MAX6330TUR-T for inverted reset logic or other MAX633x variants with matching voltage thresholds. Verify pin compatibility and package dimensions when replacing. Ensure the replacement part supports the required shunt current range and reset timeout characteristics for the specific application design.