LM239ADR

Overview

The LM239ADR is a quad differential comparator manufactured by Texas Instruments, housed in a 14-pin SOIC surface-mount package. It operates on a single power supply ranging from 2V to 30V or dual supplies of ±1V to ±15V. The device features an open-collector output compatible with CMOS, MOS, and TTL logic families. Key electrical parameters include a maximum input offset voltage of 3mV, a typical propagation delay of 300ns, and a quiescent current consumption of 2mA per channel. It supports a sink current of 6mA per channel and functions within a temperature range of -25°C to +85°C.

Feature Summary

• Quad differential architecture providing four independent comparison channels in a single integrated circuit.
• Open-collector output stage designed for direct interfacing with various digital logic systems including TTL and CMOS.
• Wide common-mode input voltage range that includes ground potential, enabling detection near the negative rail.
• Low power consumption characteristics suitable for battery-operated applications without requiring dual power supplies.

Applications

• Battery-powered monitoring systems requiring low quiescent current draw.
• On-board temperature sensing circuits utilizing thermistor-based voltage dividers.
• Watchdog timer circuits for microcontroller system supervision.
• Voltage level shifting interfaces between different logic families.

Procurement Notes

Verify the specific suffix codes against official Texas Instruments documentation to confirm exact package variations and environmental compliance status. Ensure the ordering part number matches the required industrial temperature grade and pin configuration. Cross-reference datasheet revisions to validate parameter consistency before finalizing procurement specifications.

Selection Notes

Select this component when a quad comparator with ground-referenced input capability is required. The open-collector output necessitates external pull-up resistors tailored to the target logic voltage levels. Consider the 300ns propagation delay for timing-sensitive high-speed applications where faster alternatives may be necessary.

Part Context

This device belongs to the LMx39 series of quad comparators, which are industry-standard components for general-purpose voltage comparison tasks. The LM239 variant specifically targets industrial environments with extended temperature ranges compared to commercial grades. It serves as a foundational building block for analog signal conditioning and threshold detection circuits.

Replacement Considerations

LM239ADRE4

FAQ

Can the LM239ADR operate with a single power supply?

Yes, the device is designed to operate from a single power supply ranging from 2V to 30V.

What is the input common-mode voltage range?

The input common-mode voltage range includes ground, allowing for detection signals near the negative supply rail.