LM139AW-SMD

Overview

The LM139AW-SMD is a quad differential comparator manufactured by Texas Instruments, designed for low power and low offset voltage applications. It features four independent channels within a single package, offering high precision signal comparison capabilities. The device operates with a wide supply voltage range of 2V to 36V or ±1V to ±18V, ensuring compatibility with various logic families. Key electrical parameters include a typical input offset voltage of 2mV at 30V and an output current capability of up to 20mA. It supports surface-mount installation in a 14-SOIC package and functions reliably across an extended temperature range from -55°C to +125°C.

Feature Summary

• Quad differential architecture providing four independent comparison channels in a compact surface-mount package
• Low offset voltage specification ensures high accuracy in precise signal detection and threshold monitoring
• Wide single or dual supply voltage operation allows flexibility in diverse electronic system designs
• Open-collector outputs enable easy interfacing with various logic families and voltage levels

Applications

• Precision voltage monitoring and level detection circuits
• Temperature sensing systems utilizing thermistor-based threshold switching
• Over-voltage and under-voltage protection mechanisms in power supplies
• Waveform generation and pulse width modulation control loops

Procurement Notes

Verify the specific suffix designation against the manufacturer's official datasheet to confirm pinout compatibility and electrical tolerances. Ensure the procurement source provides valid RoHS compliance documentation as required for modern assembly processes. Cross-reference the part number with the latest Texas Instruments product selection guide to avoid obsolete variants. Confirm that the supplier offers traceability certificates for quality assurance in critical applications.

Selection Notes

Select this component when multiple independent comparators are required in a space-constrained design without sacrificing precision. The low offset voltage makes it suitable for applications involving small signal differentials. Consider the open-collector output structure when designing pull-up resistor networks for the target logic voltage. Evaluate the thermal performance requirements given the extended operating temperature range specified for industrial environments.

Part Context

This component belongs to the LM139 family of low-power quad comparators, originally developed by National Semiconductor and now maintained by Texas Instruments. The series is widely recognized for its cost-effectiveness and reliability in general-purpose analog switching applications. The LM139 serves as a foundational building block for various industrial and consumer electronics requiring reliable voltage comparison functionality.

Replacement Considerations

• LM339
• LM2901

FAQ

What is the maximum output current capability of the LM139AW-SMD?

The device can sink up to 20mA of output current, allowing direct driving of LEDs or relay coils without additional buffering.

Does the LM139AW-SMD support dual supply operation?

Yes, the comparator supports both single supply voltages up to 36V and dual supplies ranging from ±1V to ±18V.