Microchip MIC803-44D3VM3-TR: A Precision 3.08V Voltage Supervisor with Manual Reset Control

In the realm of electronic systems, ensuring reliable and predictable operation during power-up, power-down, and brownout conditions is paramount. The Microchip MIC803-44D3VM3-TR stands out as a dedicated voltage supervisor IC designed specifically for this critical task. This device meticulously monitors the voltage of a system's power rail, providing a robust reset signal to the system's microcontroller or processor until the supply voltage stabilizes at a safe operating level.

The core functionality of the MIC803 revolves around its precisely fixed voltage threshold of 3.08V. This makes it an ideal guardian for systems powered by a single lithium-ion cell or any other 3.3V nominal supply, ensuring logic circuits are only permitted to operate when the power rail is truly stable. A key differentiator of this specific model is its integrated manual reset input (MR). This active-low pin allows an external switch or another digital logic signal to forcibly assert the reset output. This feature is invaluable for system debugging, user-initiated hard resets, or ensuring a known startup state triggered by an external event.

The MIC803-44D3VM3-TR is characterized by its extremely low supply current, typically drawing just 5µA. This minimal power overhead makes it perfectly suited for battery-sensitive and power-conscious portable applications. The device offers an active-low, open-drain reset output, providing design flexibility as it requires only a single external pull-up resistor to the monitored voltage rail or another logic voltage. Furthermore, it is engineered to remain stable even with very slow-moving or noisy supply voltages, thanks to its built-in glitch immunity.

Housed in a space-saving SOT-23-3 package, this supervisor is built for high reliability and a wide temperature range, catering to industrial, automotive, and consumer applications. Its simplicity of use—requiring no external components beyond a single pull-up resistor—combined with its robust feature set, provides an excellent solution for enhancing system dependability.

ICGOODFIND: The Microchip MIC803-44D3VM3-TR is an exceptionally efficient and reliable solution for power management supervision. Its combination of a fixed 3.08V threshold, manual reset capability, and ultra-low power consumption in a miniature package offers designers a superior choice for ensuring system integrity in 3.3V applications.

Keywords: Voltage Supervisor, Manual Reset, 3.08V Threshold, Open-Drain Output, Low Power Consumption.