STMICROELECTRONICS STM1001 SOT-23-3 Voltage Monitor & Reset Circuit 3.08V

The STMICROELECTRONICS STM1001 is a low-power, microprocessor supervisory circuit designed for robust power supply monitoring. It reliably asserts a reset signal whenever the monitored VCC supply voltage drops below a preset threshold, ensuring system stability during power disturbances. This active-low, open-drain reset output remains asserted until VCC rises above the threshold and remains stable for a minimum recovery time (trec), preventing erratic operation during power-up and brown-out conditions.

Engineered for efficiency, the device features an exceptionally low typical supply current of just 6μA, making it ideal for power-sensitive applications. A key reliability feature is the guaranteed reset assertion even when VCC drops as low as 1V, providing critical protection in severe undervoltage scenarios. The integrated delay time of 210ms further filters out transient noise on the supply line.

Housed in a compact SOT-23-3 surface-mount package, this monitoring circuit is perfect for space-constrained PCB designs. Its wide operating temperature range from -40°C to 85°C ensures dependable performance in harsh industrial environments. The specified reset threshold voltage is 3.08V, supporting a broad input supply range from 1.2V to 5.5V.

Core Features

• Power Supply Monitoring: Monitors a single voltage rail to ensure system integrity.
• Active-Low Reset Output: Open-drain output for flexible interfacing.
• Low Power Consumption: Typical supply current of 6μA for energy-efficient design.
• High Undervoltage Protection: Guaranteed reset assertion down to VCC = 1V.
• Integrated Delay: 210ms reset delay time for immunity to power transients.
• Wide Operating Range: Supports supply voltages from 1.2V to 5.5V.
• Industrial Temperature Rated: Operates from -40°C to 85°C.

This device is a fundamental component for enhancing the robustness