SGM811-TXKA4/TR Supervisory Circuits with Manual Reset Input

Product Overview
The SGM811-TXKA4/TR is a high-performance, low-power voltage supervisor IC from SGMICRO, designed to monitor voltage levels and issue a reset when necessary. It competes directly with Analog Devices’ ADM811TARTZ and ADM811TARTZ-REEL7, which are also widely used in power-critical applications. Despite functional similarities, the SGM811-TXKA4/TR offers superior power efficiency, voltage threshold accuracy, and a more cost-effective solution for a wide range of applications, including embedded systems, consumer electronics, and IoT devices.

Power Consumption Advantage
A significant strength of the SGM811-TXKA4/TR is its extremely low supply current, which is typically 0.5μA. In comparison, the ADM811TARTZ has a higher quiescent current of approximately 17μA. This reduction in power consumption means the SGM811-TXKA4/TR is better suited for battery-operated and energy-sensitive devices where extending battery life is critical, such as wearable electronics, remote sensors, and other portable devices.

Voltage Threshold Accuracy
The SGM811-TXKA4/TR boasts a tighter voltage threshold accuracy of ±1.4%, which is significantly better than the ±2.5% accuracy specification of the ADM811TARTZ series. This improved accuracy ensures that the voltage reset occurs with greater precision, which is essential in applications where maintaining system stability is crucial. The tighter threshold also provides better reliability when operating near the power rails, ensuring systems are protected from undervoltage events.

Reset Timeout and Reliability
Both the SGM811-TXKA4/TR and ADM811TARTZ offer a reset timeout period of approximately 240ms after the supply voltage returns above the threshold. This ensures that both devices are compatible in timing requirements and provide a stable reset signal for most microcontroller or processor startups. The SGM811-TXKA4/TR, however, offers greater reset reliability due to its lower power operation, reducing the risk of unintended resets in power-sensitive systems.

Package and Pinout Compatibility
Both the SGM811-TXKA4/TR and ADM811TARTZ are available in the widely-used SOT-23-3 package with the same pinout configuration. This guarantees that the SGM811-TXKA4/TR can be used as a drop-in replacement for the ADM811TARTZ in existing designs without the need for re-layout or modifications to the PCB, thus simplifying the design process and minimizing costs in terms of manufacturing and time-to-market.

Operating Voltage Range
The SGM811-TXKA4/TR operates within a 1.0V to 5.5V input voltage range, providing compatibility with a wide range of voltage rails, including 1.8V, 2.5V, 3.3V, and 5V systems. While the ADM811TARTZ also covers a similar voltage range, the SGM811-TXKA4/TR has been optimized for better performance at lower voltages, ensuring more stable operation during power-down events or fluctuations in supply voltage.

Cost and Supply Chain Efficiency
SGMICRO’s SGM811-TXKA4/TR is known for competitive pricing, offering a highly cost-effective solution without sacrificing performance. In comparison, ADM811TARTZ products from Analog Devices tend to be priced at a premium. Additionally, SGMICRO offers faster lead times and more flexible supply chain options, making the SGM811-TXKA4/TR an attractive choice for customers requiring reliable availability and cost-efficiency—especially in high-volume manufacturing.

Conclusion
In conclusion, the SGM811-TXKA4/TR offers superior performance in key areas such as power efficiency, voltage threshold accuracy, and cost-effectiveness when compared to the ADM811TARTZ series. With a lower supply current, higher threshold accuracy, and competitive pricing, the SGM811-TXKA4/TR is a clear choice for customers seeking reliable, efficient, and affordable voltage supervisor solutions.