LM809M3-2.93/NOPB

Supervisors Overview

The LM809M3-2.93/NOPB is a voltage supervisory integrated circuit manufactured by Texas Instruments, designed for microprocessor reset applications. It operates within a supply voltage range up to 5.5 V and features a fixed threshold voltage of 2.93 V. The device provides one monitored input with an active-low, push-pull output type. It includes a reset delay time of 840 ms and lacks manual reset, watchdog timer, or battery backup switching functions. Accuracy is specified at 5%. The component supports surface-mount installation in an SOT-23-3 package and functions across a temperature range from -40°C to +105°C.

Supervisors Feature Summary

• Provides active-low push-pull reset signal generation based on monitored supply voltage
• Ensures system stability through defined reset delay timing after power-up
• Supports wide industrial operating temperature conditions for reliable performance

Supervisors Applications

• Microprocessor system hardware monitoring
• Voltage supervision for embedded controllers
• Power management reset circuits in industrial equipment

Supervisors Procurement Notes

Verify the complete part number including the /NOPB suffix to ensure compliance with lead-free manufacturing standards and environmental regulations. Confirm that the specific threshold voltage variant matches the target application requirements, as other versions exist within the same family. Check manufacturer documentation for any recent product change notices regarding marking or packaging updates before finalizing procurement orders.

Supervisors Selection Notes

Select this component when a fixed 2.93 V threshold is required for single-input voltage supervision. Consider the 840 ms reset delay duration to ensure compatibility with the target processor's startup sequence. Evaluate the SOT-23-3 package constraints against available board space. Ensure the maximum supply voltage rating aligns with the system's peak power rail levels to prevent damage during transient events.

Supervisors Part Context

This part belongs to the LM809/LM810 series of 3-pin microprocessor reset circuits produced by Texas Instruments. The series offers various fixed threshold voltages to accommodate different logic families and power rails. The LM809 variant specifically provides active-low outputs, distinguishing it from complementary parts in the lineup that may offer active-high configurations.

Supervisors Replacement Considerations

The LM809M3-293 is listed as Not Recommended for New Designs (NRND), with the LM809M3-2.93/NOPB identified as the direct alternate substitute. Verify pinout compatibility and electrical parameter alignment when transitioning between these identifiers.