LM331AN

Overview

The LM331AN is a precision voltage-to-frequency converter manufactured by Texas Instruments, housed in an 8-pin PDIP package. It operates as a single-function device capable of converting analog input voltages into proportional digital frequency outputs. The component supports a wide dynamic range and low operating frequencies, suitable for high-resolution applications. It functions within a supply voltage range of 4V to 40V and maintains a maximum linear error of 0.02%. The device is rated for operation up to 70°C and complies with EAR99 regulations.

Feature Summary

• Provides precise conversion between analog voltage signals and digital frequency outputs
• Supports bidirectional operation for both voltage-to-frequency and frequency-to-voltage modes
• Features low linear error for high accuracy signal processing
• Operates on a single power supply with wide voltage tolerance

Applications

• Precision tachometer circuits for rotational speed measurement
• High-resolution analog-to-digital conversion systems
• Frequency modulation and demodulation circuits
• Long-distance analog signal transmission interfaces

Procurement Notes

Verify the specific suffix 'AN' corresponds to the standard PDIP-8 package and commercial temperature grade when sourcing. Confirm RoHS compliance status as indicated in official datasheets, noting potential discrepancies in third-party listings. Ensure the supplier provides valid traceability documentation for the Texas Instruments manufacturer origin. Check for any obsolete status or lifecycle notifications before finalizing procurement plans.

Selection Notes

Select this component when high linearity and wide dynamic range are required for V-F conversion tasks. The PDIP-8 package is suitable for through-hole prototyping and general-purpose PCB designs. Consider the 4V to 40V supply range compatibility with existing system power rails. Evaluate the 0.02% linear error specification against application tolerance requirements for critical measurement loops.

Part Context

The LM331 series belongs to Texas Instruments' portfolio of precision analog converters. The 'LM' prefix typically denotes military-grade origins, while the '331' identifies the specific voltage-to-frequency converter topology. The 'A' variant often indicates improved specifications over earlier versions, and 'N' specifies the plastic dual-in-line package style commonly used in industrial instrumentation.

Replacement Considerations

The LM131A and LM231A are documented related parts offering similar precision voltage-to-frequency conversion capabilities. Verify pinout compatibility and electrical parameter alignment before substituting these variants in existing designs.