SGM811-SXKA4/TR Supervisory Circuits with Manual Reset Input

Product Overview
The SGM811-SXKA4/TR from SGMICRO is a high-precision voltage supervisor IC designed to monitor system supply voltages and generate a reset when the monitored voltage drops below a preset threshold. It directly competes with Analog Devices’ ADM811SARTZ and ADM811SARTZ-REEL7, which are also 3-pin SOT-23 devices targeting similar applications. However, the SGM811-SXKA4/TR stands out with lower power consumption, tighter voltage threshold accuracy, and better cost-performance ratio.

Power Consumption Advantage
A significant differentiator for the SGM811-SXKA4/TR is its exceptionally low quiescent current, typically around 0.5μA, compared to 17μA typical for the ADM811SARTZ series. This ultra-low power consumption makes SGM811-SXKA4/TR highly suitable for battery-powered and energy-sensitive designs, such as wearable devices, IoT sensors, and wireless modules—greatly extending system battery life.

Voltage Threshold Accuracy
The SGM811-SXKA4/TR offers a maximum threshold voltage accuracy of ±1.4%, whereas the ADM811SARTZ is specified with a wider tolerance of ±2.5%. This tighter specification enables more precise power monitoring, ensuring the reset signal is asserted closer to the actual threshold voltage and improving system reliability during voltage drops or brownouts.

Reset Output and Timing Consistency
Both the SGM811-SXKA4/TR and ADM811SARTZ include push-pull active-low reset outputs, and both provide a typical reset timeout of 240ms after the supply voltage returns above the threshold. This functional alignment makes the SGM811 a drop-in replacement from both electrical and timing perspectives.

Package and Pinout Compatibility
All devices are offered in the compact SOT-23-3 package and maintain identical pinouts. This ensures seamless replacement without PCB modification, supporting quick design-in and offering flexibility for second-sourcing and cost optimization without risk to the end product.

Operating Voltage Range
The SGM811-SXKA4/TR operates over a wide input range of 1.0V to 5.5V, fully covering typical logic voltages such as 1.8V, 2.5V, 3.3V, and 5V rails. This is on par with ADM811SARTZ but with improved performance under low-voltage conditions, providing a more stable reset signal during rapid power-down events or marginal supply levels.

Supply Chain and Cost Benefits
SGMICRO provides more competitive pricing, shorter lead times, and flexible local technical support—especially important for high-volume and fast-cycle production. In contrast, Analog Devices’ ADM811SARTZ/ADM811SARTZ-REEL7 may face supply constraints due to global demand and longer delivery cycles. For OEMs and ODMs, this makes SGM811-SXKA4/TR a more reliable and economical choice.

Conclusion
In conclusion, the SGM811-SXKA4/TR matches the ADM811SARTZ series in functional equivalence but outperforms it in key parameters—notably power efficiency, voltage accuracy, and supply flexibility. With full compatibility and superior value, SGMICRO’s solution is ideally positioned as a preferred alternative for power supervision in compact, high-reliability electronics.