LM809M3X-2.63/NOPB

Supervisors Overview

The LM809M3X-2.63/NOPB is a voltage supervisory circuit manufactured by Texas Instruments, designed to monitor a single input voltage line. It operates within a supply voltage range of up to 5.5 V and features an active-low, push-pull output configuration. The device triggers a reset signal when the monitored voltage drops below a threshold of 2.63 V. It includes a fixed reset delay time of 240 ms to ensure stable system recovery. The component is housed in a SOT-23-3 surface-mount package and supports operation across an extended temperature range from -40°C to +105°C.

Supervisors Feature Summary

• Provides active-low push-pull output for direct interface with digital logic systems
• Monitors a single power supply rail for under-voltage conditions
• Includes a fixed internal reset delay timer to prevent premature reset during power-up transients

Supervisors Applications

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

Supervisors Procurement Notes

Verify the specific suffix 'NOPB' indicates lead-free and RoHS compliance status as per current manufacturer documentation. Confirm the 'X' designation in the part number corresponds to the correct tape-and-reel packaging variant intended for automated assembly processes. Ensure the 2.63 V threshold aligns precisely with the target system's brown-out requirements before finalizing procurement orders.

Supervisors Selection Notes

Select this component when a simple, low-pin-count supervisor is required for single-rail monitoring applications. The active-low push-pull output allows for direct driving of reset pins without additional pull-up resistors. Consider the 240 ms fixed delay against system startup timing constraints. The wide operating temperature range makes it suitable for industrial environments where thermal stability is critical for reliable voltage supervision.

Supervisors Part Context

This part belongs to the LM809 family of supervisory circuits from Texas Instruments. The family offers various threshold voltages to accommodate different standard logic levels. The LM809 series is characterized by its simplicity, requiring minimal external components. It serves as a fundamental building block for ensuring system reliability by detecting power faults in embedded designs.

Supervisors Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Verify compatibility with existing footprints if considering alternative manufacturers.