LM809M3X-4.38/NOPB

Supervisors Overview

The LM809M3X-4.38/NOPB is a voltage supervisory circuit manufactured by Texas Instruments, designed for monitoring single-channel input voltages. It operates within a supply voltage range of up to 5.5 V and features an active-low, push-pull output type. The device provides a reset delay time of 140 ms minimum and includes thermal shutdown protection. 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

• Active-low push-pull output configuration for direct logic interface
• Integrated thermal shutdown for enhanced operational safety
• Compact SOT-23-3 surface-mount packaging

Supervisors Applications

• Portable equipment power management
• Microprocessor system supervision
• Battery-powered device monitoring

Supervisors Procurement Notes

Verify the specific suffix 'NOPB' indicates lead-free and RoHS compliance status as per manufacturer documentation. Confirm the exact threshold voltage variant matches the design requirement of 4.38 V. Ensure the SOT-23-3 footprint aligns with the PCB layout specifications. Cross-reference the datasheet revision date to ensure all electrical characteristics are current. Validate that the component meets the required industrial temperature range specifications.

Supervisors Selection Notes

Select this component when a simple reset function with a fixed 4.38 V threshold is required. Consider the 140 ms reset delay for timing-sensitive applications. Evaluate the push-pull output capability against open-drain alternatives if drive strength is critical. Verify compatibility with the system's maximum supply voltage of 5.5 V. Assess the thermal performance requirements given the integrated shutdown feature.

Supervisors Part Context

This part belongs to the LM809 series of voltage supervisors from Texas Instruments. The series offers various fixed threshold voltages to accommodate different rail monitoring needs. The M3X suffix denotes the specific SOT-23-3 package variant. The NOPB suffix confirms the absence of lead-based materials, adhering to environmental standards.

Supervisors Replacement Considerations

LM809M3-4.38/NOPB is a confirmed equivalent part number offering identical functionality and pinout.