LM339AN

Overview

The LM339AN is a quad differential voltage comparator manufactured by Texas Instruments, designed for operation from a single power supply. It features four independent comparators within a single package, utilizing an open-collector output configuration that facilitates wired-AND connections. The device operates with a supply voltage range of 2 V to 30 V and draws a typical operating current of 500 uA per channel. Key electrical specifications include a maximum input offset voltage of 3 mV, an input bias current of 250 nA, and a response time of 1.3 µs. It is housed in a 14-pin PDIP package and supports through-hole mounting.

Feature Summary

• Quad differential input architecture providing four independent comparison channels
• Open-collector outputs enabling flexible logic interfacing and wired-AND configurations
• Low power consumption suitable for battery-operated applications
• Wide single-supply voltage operational range

Applications

• Temperature monitoring systems
• Voltage level detection circuits
• Over-voltage protection mechanisms
• Peak hold circuits

Procurement Notes

Verify the specific suffix designation upon ordering, as variations such as NOPB indicate lead-free compliance while other suffixes may denote different packaging or environmental standards. Confirm the package type matches the PCB footprint requirements, specifically the 14-pin DIP format. Ensure the supplier provides valid RoHS documentation if environmental compliance is mandatory for the assembly process.

Selection Notes

Select this component when multiple independent voltage comparisons are required from a single source. The open-collector output necessitates external pull-up resistors, which must be sized according to the load capacitance and desired switching speed. Consider the input offset voltage specification if high precision is required at low voltage differences. Verify that the supply voltage remains within the 2 V to 30 V limit during all operating conditions.

Part Context

This part belongs to the LMx39 family of quad comparators, which includes variants like LM139, LM239, and LM2901. These devices share similar functional architectures but may differ in temperature ranges, offset voltage tolerances, or pinout compatibility. The LM339AN specifically denotes the commercial grade version with standard performance characteristics and PDIP packaging.

Replacement Considerations

LM339AN/NOPB serves as a direct lead-free replacement. LM339AN/PB is an obsolete variant that has been discontinued. Cross-brand equivalents should be evaluated based on pin compatibility and electrical parameter alignment.