SGM811-MXKA4/TR Supervisory Circuits with Manual Reset Input

Product Overview
The SGM811-MXKA4/TR is a high-precision, low-power voltage supervisor from SGMICRO, designed to monitor supply voltages and assert a reset when the voltage falls below a defined threshold. It is functionally equivalent to Analog Devices’ ADM811MARTZ and ADM811MARTZ-REEL7, both widely used in power-sensitive applications. However, the SGM811-MXKA4/TR distinguishes itself with superior power efficiency, higher threshold accuracy, and cost-performance benefits, making it ideal for modern embedded systems.

Power Consumption
One of the most notable advantages of the SGM811-MXKA4/TR is its ultra-low supply current, which is typically 0.5μA. In contrast, the ADM811MARTZ consumes approximately 17μA under similar operating conditions. This dramatic reduction—over 95% lower power consumption—is particularly beneficial for battery-operated and energy-constrained systems, such as IoT nodes, medical wearables, and portable consumer electronics.

Voltage Threshold Accuracy
The SGM811-MXKA4/TR offers a tight voltage threshold accuracy of ±1.4% (max), outperforming the ±2.5% specification of the ADM811MARTZ series. This tighter tolerance provides more reliable system monitoring and earlier fault detection, which is critical for applications where power integrity directly affects data reliability and system uptime.

Reset Timeout Period
The SGM811-MXKA4/TR includes a fixed reset timeout delay of 240ms (typical), which is consistent with the ADM811MARTZ/ADM811MARTZ-REEL7. This timing ensures compatibility with most microcontroller and processor startup requirements and allows drop-in replacement without adjustments to system timing parameters.

Package Compatibility and Pinout
All compared parts—SGM811-MXKA4/TR, ADM811MARTZ, and ADM811MARTZ-REEL7—are available in the industry-standard SOT-23-3 package with matching pinouts. This ensures full mechanical and layout compatibility, simplifying integration and enabling second-source strategies in production without PCB redesign.

Voltage Range and Reset Output
Both devices operate over a wide input voltage range of 1.0V to 5.5V, making them suitable for systems operating at 1.8V, 2.5V, 3.3V, and 5V rails. However, the SGM811-MXKA4/TR exhibits better stability at lower voltages, helping maintain reliable reset assertion under brownout or deep discharge scenarios.

Supply Chain and Cost Advantage
SGMICRO maintains shorter lead times, stable inventory, and localized customer support, particularly for high-volume commercial and industrial applications. In comparison, Analog Devices’ ADM811MARTZ series—while well established—can be subject to longer global lead times and higher per-unit costs, especially during supply-constrained cycles. The SGM811-MXKA4/TR provides customers with an excellent balance of performance, availability, and affordability.

Conclusion
In summary, the SGM811-MXKA4/TR not only meets the functional and electrical performance of the ADM811MARTZ/ADM811MARTZ-REEL7 but exceeds expectations in key areas such as power efficiency and threshold accuracy, while also delivering cost and supply chain advantages. For designers seeking robust supervisory functionality without compromising on efficiency or cost, SGMICRO’s SGM811-MXKA4/TR is a superior alternative.