LM809M3-4.00/NOPB

Supervisors Overview

The LM809M3-4.00/NOPB is a voltage supervisor integrated circuit manufactured by Texas Instruments, designed for monitoring single-supply voltages. It features an active-low, push-pull reset output to ensure proper system initialization. The device operates within a supply voltage range of 1.2 V to 5.5 V and provides a fixed threshold voltage of 4.00 V. Key electrical parameters include a reset delay time of 240 ms and an accuracy of 5%. It is housed in a SOT-23-3 surface-mount package and supports an operating temperature range from -40°C to +105°C.

Supervisors Feature Summary

• Provides active-low, push-pull reset signal generation for reliable power-on reset sequencing
• Monitors a single input voltage channel with a fixed threshold detection capability
• Operates across a wide industrial temperature range suitable for harsh environments

Supervisors Applications

• Microprocessor and microcontroller power supply monitoring
• Battery-powered systems requiring low-voltage detection
• Portable electronic devices needing compact supervision solutions

Supervisors Procurement Notes

Verify the obsolete status of this specific part number before procurement planning. Confirm availability of qualified substitutes such as the ADM809JARTZ-REEL7 or other LM809 variants with compatible thresholds. Ensure that any replacement component matches the required SOT-23-3 package and electrical specifications to maintain design integrity without requalification delays.

Supervisors Selection Notes

Select this component when a fixed 4.00 V threshold is required for system supervision. Consider the 240 ms reset delay and 5% accuracy against system timing requirements. Evaluate the SOT-23-3 package constraints for PCB layout. Verify compatibility with the target supply voltage range of 1.2 V to 5.5 V and the operational temperature limits of -40°C to +105°C for the intended application environment.

Supervisors Part Context

The LM809 series consists of 3-pin voltage supervisors offering push-pull outputs for supply monitoring. This specific variant, LM809M3-4.00/NOPB, defines a 4.00 V trip point. The 'M3' suffix indicates the SOT-23-3 package type, while '/NOPB' denotes lead-free construction compliant with RoHS standards. These components are engineered for cost-sensitive applications requiring basic power management functions.

Supervisors Replacement Considerations

The LM809M3-4.00/NOPB is listed as obsolete. Available substitutes include similar parts like the ADM809JARTZ-REEL7. Verify pinout compatibility and threshold voltage matching when selecting alternatives to ensure seamless integration into existing designs.