LM239PWR

Overview

The LM239PWR is a quad differential voltage comparator manufactured by Texas Instruments, housed in a 14-TSSOP surface-mount package. It operates on a single power supply ranging from 2 V to 30 V or dual supplies of ±1 V to ±15 V. The device features four independent comparators with open-collector outputs compatible with CMOS and TTL logic families. Key electrical specifications include a maximum input offset voltage of 5 mV at 30 V, an input bias current of 0.25 µA, and a typical output sink current of 20 mA. The unit functions within a commercial temperature range of 0°C to 70°C.

Feature Summary

• Integrates four independent high-gain differential comparators for multi-channel signal processing
• Features open-collector outputs enabling direct interfacing with various digital logic families including CMOS and TTL
• Designed for operation from a single power supply or split dual supplies across a wide voltage range
• Provides low input bias current characteristics suitable for high-impedance sensor interfaces

Applications

• Overvoltage and undervoltage detection circuits
• Window comparator configurations for threshold monitoring
• Analog-to-digital converter front-end conditioning
• Level shifting between analog signals and digital logic inputs

Procurement Notes

Verify the specific suffix PWR indicates the TSSOP-14 package variant when sourcing. Confirm RoHS compliance status as manufacturing updates may affect lead-free certification. Check for automotive-grade alternatives like the LM239AQDRQ1 if extended temperature ranges or AEC-Q100 qualification are required for the target application environment.

Selection Notes

Select this component when multiple independent comparison channels are needed in a compact surface-mount form factor. Ensure the application does not require push-pull outputs, as this device utilizes open-collector topology. Verify that the load connected to the output can handle the specified sink current and that pull-up resistors are appropriately sized for the desired logic levels and switching speed.

Part Context

This part belongs to the LMx39 family of quad comparators from Texas Instruments, which includes variants such as the LM139, LM239, LM339, and LM2901. These devices share similar functional architectures but differ in temperature ranges, precision grades, and packaging options. The LM239 series is widely used in industrial and consumer electronics for basic voltage monitoring tasks.

Replacement Considerations

LM339PWR: Pin-compatible alternative with potentially different temperature or precision specifications. LM2901N: Similar quad comparator often available in through-hole packages. LM139: Military grade equivalent with wider operating temperature range.