LM239N

Overview

The LM239N is a quad differential voltage comparator manufactured by Texas Instruments, housed in a 14-pin PDIP package. It operates from a single power supply ranging from 2 V to 36 V or dual supplies of ±1 V to ±18 V. The device features an input common-mode voltage range that includes ground, allowing detection near the negative rail. It utilizes open-collector outputs compatible with TTL, DTL, ECL, MOS, and CMOS logic systems. Key electrical specifications include a maximum input offset voltage of 2 mV, a typical response time of 300 ns, and a quiescent supply current of 2 mA.

Feature Summary

• Supports wide single-supply operation from 2 V to 36 V
• Input common-mode voltage range extends to ground potential
• Open-collector outputs enable direct interface with various logic families
• Low power consumption suitable for battery-operated applications

Applications

• Battery-powered monitoring circuits
• Level shifting between different logic families
• Window comparator designs
• Over-voltage and under-voltage protection circuits

Procurement Notes

Verify the specific manufacturer source, as the LM239N designation is utilized by multiple semiconductor vendors including Texas Instruments and STMicroelectronics. Confirm that the received component matches the required pinout and electrical characteristics for your specific application. Ensure the package type corresponds to the intended PCB layout. Check for any lead-free or RoHS compliance requirements if applicable to your manufacturing standards.

Selection Notes

Select this component when a low-cost, quad comparator with ground-referenced inputs is required. It is suitable for applications where the signal source approaches the negative supply rail. Consider the open-collector output structure, which necessitates external pull-up resistors for proper logic level generation. Evaluate the 300 ns propagation delay against system timing requirements to ensure adequate switching speed.

Part Context

The LM239N belongs to the LMx39 family of quad comparators, which also includes the LM139, LM2901, and LM339. These devices share similar functional architectures but may differ in temperature ranges, offset voltage specifications, or packaging options. The LM239N specifically represents the commercial/industrial grade variant within this lineage, offering a balance of performance and cost for general-purpose analog comparison tasks.

Replacement Considerations

LM339N serves as a functionally equivalent alternative within the same family. LM2901N offers comparable quad comparator functionality with potentially different environmental ratings. Verify pin compatibility and electrical parameters before substituting.