LM809M3-4.63/NOPB

Supervisors Overview

The LM809M3-4.63/NOPB is a 3-pin microprocessor reset circuit manufactured by Texas Instruments, designed for supply voltage monitoring in electronic systems. It operates within a maximum supply voltage of 5.5 V and features an active-high, push-pull output type. The device monitors a single input with a threshold voltage of 4.63 V and provides a reset delay time of 840 ms. It functions reliably across a temperature range from -40°C to +105°C and is housed in a SOT-23-3 surface-mount package.

Supervisors Feature Summary

• Provides active-high, push-pull reset signals for reliable logic interfacing
• Monitors a single supply voltage input against a fixed threshold
• Operates without manual reset controls or watchdog timer functionality

Supervisors Applications

• Microprocessor system power supply supervision
• Embedded controller reset generation
• Battery-powered device voltage monitoring

Supervisors Procurement Notes

Verify the specific suffix configuration matches the required threshold voltage and output polarity before procurement. Confirm RoHS compliance status through official manufacturer documentation. Ensure the SOT-23-3 footprint aligns with the target PCB layout. Cross-reference the part number with current availability lists as distribution channels may vary.

Supervisors Selection Notes

Select this component when an active-high reset signal is required for downstream logic circuits. The fixed 4.63 V threshold suits applications monitoring standard 5 V or lower supply rails. Consider the 840 ms reset delay duration to ensure adequate stabilization time for connected processors. Verify that the SOT-23-3 package size fits the mechanical constraints of the design.

Supervisors Part Context

This part belongs to the LM809/LM810 family of 3-pin microprocessor reset circuits. The LM809 series typically offers active-low outputs, while the LM810 variant provides active-high outputs. This specific model integrates the LM810 active-high functionality within the LM809 package numbering scheme, featuring a 4.63 V threshold.

Supervisors Replacement Considerations

Publicly confirmed substitutes include other LM809 or LM810 variants with matching thresholds and output polarities. Verify pin compatibility and electrical specifications before substitution.