LM809M3-4.63

Supervisors Overview

The LM809M3-4.63 is a voltage supervisory circuit manufactured by Texas Instruments, originally developed under the National Semiconductor brand. It functions as a microprocessor reset monitor with a fixed threshold voltage of 4.63 V. The device features an active low, push-pull output and provides a reset delay time of 240 ms. It operates within a supply voltage range up to 5.5 V and maintains accuracy within 5%. Designed for surface mount installation, it is housed in a SOT-23-3 package and supports operation across a temperature range of -40°C to +105°C.

Supervisors Feature Summary

• Provides precise voltage supervision for digital systems without requiring external components
• Features active low push-pull output for direct processor interface
• Optimized to suppress fast transient faults on power lines

Supervisors Applications

• Digital system voltage monitoring
• Microprocessor reset signal generation
• Battery-powered applications requiring low quiescent current

Supervisors Procurement Notes

Verify that the component is sourced from authorized distributors to ensure authenticity. Confirm the specific suffix indicates the 4.63 V threshold variant. Check RoHS compliance status if required for your manufacturing process. Ensure the SOT-23-3 package matches your PCB footprint design requirements before ordering.

Supervisors Selection Notes

Select this part when a fixed 4.63 V threshold is required for system supervision. Consider the 240 ms reset delay for timing constraints. Evaluate the SOT-23-3 package size against available board space. Compare performance against similar supervisors if different thresholds or output polarities are needed.

Supervisors Part Context

This component belongs to the LM809/LM810 family of 3-pin microprocessor reset circuits. Originally produced by National Semiconductor, the product line was integrated into Texas Instruments' portfolio following their acquisition. The series offers cost-effective solutions for system monitoring in various electronic applications.

Supervisors Replacement Considerations

Cross-reference with MAX809 variants for functional equivalence. Verify pinout compatibility with SOT-23-3 packages. Ensure threshold voltage and reset delay specifications match application requirements before substituting.