LM331N

Overview

The LM331N is a precision voltage-to-frequency converter manufactured by Texas Instruments. It operates within a supply voltage range of 4V to 40V and supports frequencies from 1Hz to 100kHz. The device features a maximum linear error of 0.02% and a maximum operating frequency of 0.1 MHz. It is housed in an 8-pin PDIP package with a maximum negative input voltage of -0.2 V.

Feature Summary

• Precision voltage-to-frequency conversion capability
• Frequency-to-voltage conversion functionality
• Wide supply voltage operational range

Applications

• Precision analog signal processing circuits
• Data acquisition systems requiring frequency modulation
• Industrial control applications involving sensor interfacing

Procurement Notes

Verify the specific manufacturer source, as the LM331N was originally developed by National Semiconductor before its integration into Texas Instruments. Confirm that the component matches the required 8-pin DIP physical form factor and electrical specifications for your design. Ensure compatibility with the intended operating temperature range and supply voltage requirements before finalizing procurement decisions.

Selection Notes

Select this component when high-precision conversion between voltage and frequency domains is required. Consider the wide supply voltage range and low linear error characteristics for demanding applications. Evaluate the PDIP packaging constraints against board space limitations and verify thermal performance needs relative to the specified operating temperature limits.

Part Context

The LM331N belongs to the LMx31x series of precision converters. This family includes variants such as the LM231A and LM331A, offering similar functional capabilities with potential differences in temperature ranges or accuracy specifications. The component serves as a fundamental building block for analog-to-digital interface tasks in mixed-signal systems.

Replacement Considerations

The LM331N/NOPB is a documented equivalent variant from Texas Instruments. Other compatible parts include the LM231A and LM331A from various manufacturers. Verify pinout compatibility and electrical parameter alignment when substituting.