Based on this product's specifications, here are some alternatives and similar models
Voltage-to-Frequency Converter Texas Instruments LM331N/NOPB DIP-8 precision V/F converter
Summary description:
LM331N/NOPB by Texas Instruments is a voltage-to-frequency (V/F) converter in a DIP-8 package. Designed for converting an input voltage into a proportional frequency output, it supports accurate analog-to-frequency translation for measurement, sensing, and signal isolation applications. Typical uses include frequency-based analog data transmission, sensor interfacing, and frequency metering where stable V-to-F conversion and simple external component configuration are required.