SGM811-LXKA4/TR Supervisory Circuits with Manual Reset Input

Product Overview
The SGM811-LXKA4/TR is a high-accuracy, low-power voltage supervisor IC designed by SGMICRO to monitor supply voltage levels and assert a reset when necessary. It serves as a functional equivalent to Analog Devices’ ADM811LARTZ and ADM811LARTZ-REEL7, both widely used in power monitoring applications. While all devices offer essential reset functions, the SGM811-LXKA4/TR stands out with lower power consumption, tighter threshold accuracy, and more cost-effective sourcing—making it an ideal candidate for modern designs.

Power Consumption
The SGM811-LXKA4/TR features an ultra-low typical supply current of 0.5μA, substantially outperforming the ADM811LARTZ, which consumes approximately 17μA. This represents a 97% reduction in quiescent current, significantly benefiting battery-operated and energy-sensitive applications such as portable electronics, sensor nodes, and embedded control systems.

Voltage Threshold Accuracy
The SGM811-LXKA4/TR provides a precise threshold detection with a maximum voltage threshold accuracy of ±1.4%, compared to the ±2.5% accuracy of the ADM811LARTZ series. This tighter precision allows for more reliable under-voltage detection, ensuring systems are protected closer to their true operating limits—particularly important in MCU/MPU-controlled applications.

Reset Timeout Performance
The reset timeout delay of the SGM811-LXKA4/TR is 240ms (typical), which is fully aligned with the ADM811LARTZ/ADM811LARTZ-REEL7 series. This compatibility ensures that system timing integrity is maintained, allowing for direct replacement without firmware modification or timing conflicts in existing designs.

Package and Footprint Compatibility
All three devices—SGM811-LXKA4/TR, ADM811LARTZ, and ADM811LARTZ-REEL7—are available in the space-saving SOT-23-3 package. The identical pinout and electrical characteristics make the SGM811-LXKA4/TR a drop-in alternative for systems already designed around the ADM811L. This facilitates a smooth migration path or enables second sourcing for production security.

Operating Voltage Range
Both the SGM811-LXKA4/TR and ADM811L series operate over a wide supply voltage range of 1.0V to 5.5V, ensuring compatibility with modern low-voltage digital logic (1.8V, 2.5V, 3.3V, 5V). However, the SGM811-LXKA4/TR maintains reset output performance more consistently at the lower end of this range, enhancing reliability in ultra-low-voltage conditions.

Supply Chain and Cost Advantage
SGMICRO offers stable and local supply chains, short lead times, and cost-effective pricing, especially in high-volume OEM applications. In contrast, Analog Devices’ ADM811LARTZ/ADM811LARTZ-REEL7, while reputable, may be subject to global sourcing constraints and higher pricing structures, particularly during allocation periods. For customers seeking performance without premium pricing, the SGM811-LXKA4/TR delivers exceptional value.

Conclusion
The SGM811-LXKA4/TR matches the functional and timing performance of the ADM811LARTZ series while delivering superior power efficiency, tighter voltage accuracy, and cost and availability advantages. For designers targeting robust, low-power, and cost-sensitive applications, SGMICRO’s SGM811-LXKA4/TR is a compelling and competitive alternative, fully aligned with industry standards yet optimized for next-generation system needs.