LM139ADG4

Overview

The LM139ADG4 is a quad differential comparator manufactured by Texas Instruments, housed in a 14-pin SOIC package. It operates on a single power supply ranging from 2 V to 36 V or dual supplies of ±1 V to ±18 V. The device features four independent comparators with open-collector outputs capable of sinking up to 16 mA. Key electrical specifications include a maximum input offset voltage of 5 mV and a typical quiescent current of 500 µA per channel. The unit supports an extended industrial temperature range from -55°C to +125°C.

Feature Summary

• Integrates four independent high-gain differential comparators within a single compact package.
• Features open-collector outputs compatible with various logic families including TTL and CMOS.
• Designed for low power consumption with minimal quiescent current draw per channel.
• Operates reliably across a wide common-mode voltage range extending to ground.

Applications

• Temperature sensing circuits utilizing thermistor bridges
• Over-voltage and under-voltage protection monitoring systems
• Peak detection and waveform shaping applications
• Logic level translation between different voltage domains

Procurement Notes

Verify the specific suffix 'DG4' indicates the lead-free RoHS-compliant variant when sourcing. Confirm the package type matches the required PCB footprint as variations exist within the LM139 family. Ensure the operating environment stays within the specified -55°C to +125°C range for guaranteed performance. Cross-reference the datasheet revision date to ensure compatibility with latest design guidelines.

Selection Notes

Select this component when multiple independent comparison functions are required in space-constrained designs. It serves as a direct replacement for legacy LM139 units while offering improved thermal stability. Consider the open-collector output requirement for pull-up resistor implementation in the circuit design. Evaluate the 5 mV offset voltage specification against the precision requirements of the target application.

Part Context

This part belongs to the LM139 series of quad differential comparators, widely used in analog signal processing. It shares functional similarities with the LM339 but offers extended temperature capabilities. The device is part of Texas Instruments' standard linear integrated circuit portfolio. It is commonly found in industrial control systems and consumer electronics requiring reliable voltage threshold detection.

Replacement Considerations

The LM139DRG4 is a verified equivalent part number offering identical functionality in a tape-and-reel packaging format. Designers may also consider the LM2901 for similar quad comparator applications with slight pinout differences. Verify that any substitute maintains the same 14-pin SOIC package dimensions for board compatibility.