LM809M3-2.63

Supervisors Overview

The LM809M3-2.63/NOPB is a voltage supervisory circuit manufactured by Texas Instruments, designed for monitoring single-input power supplies. It features an active-low, push-pull reset output and operates within a supply voltage range up to 5.5 V. The device provides a fixed threshold voltage of 2.63 V with 5% accuracy. Key electrical parameters include a reset delay time of 240 ms and operation across a temperature range from -40°C to +105°C. It is housed in a SOT-23-3 surface-mount package.

Supervisors Feature Summary

• Provides reliable system reset via active-low push-pull output when monitored voltage drops below the specified threshold.
• Ensures stable power-up sequencing through a defined reset delay time to allow supply stabilization.
• Operates effectively in industrial environments with extended high-temperature capability up to 105°C.

Supervisors Applications

• Microprocessor and microcontroller power supply monitoring
• Battery-powered equipment voltage supervision
• Industrial control system reset generation

Supervisors Procurement Notes

Verify the complete part number including the /NOPB suffix to ensure compliance with RoHS standards and lead-free manufacturing requirements. Confirm that the specific 2.63 V threshold matches the target application's voltage rail. Check datasheet revisions for any updates regarding marking or packaging changes. Ensure sourcing channels provide original manufacturer documentation to avoid counterfeit components.

Supervisors Selection Notes

Select this component when a low-cost, single-channel supervisor with an active-low output is required. The 2.63 V threshold suits applications monitoring 3.3 V or similar rails where precise brown-out detection is necessary. Consider the 240 ms reset delay for timing constraints. Compare against the LM810 series if an active-high output is preferred instead. Verify thermal performance for the intended operating environment.

Supervisors Part Context

This part belongs to the LM809 family of simple reset circuits from Texas Instruments. It shares the SOT-23-3 package and basic functionality with other variants like the LM809M3-2.93/NOPB, differing primarily in the fixed threshold voltage. The family offers various threshold options to accommodate different standard voltage rails without requiring external resistor networks.

Supervisors Replacement Considerations

The LM809M3-293 is listed as Not Recommended for New Designs (NRND), with the LM809M3-2.93/NOPB provided as the designated alternate. Direct pin-to-pin replacements may exist among other manufacturers' supervisors with identical 2.63 V thresholds and active-low outputs, but electrical parameter verification is essential.