ISO100AP

Overview

The ISO100AP is an optically-coupled linear isolation amplifier manufactured by Texas Instruments (formerly Burr-Brown). It provides high accuracy, linearity, and time-temperature stability through matched optical components and active laser trimming. The device features a continuous isolation voltage of 750V and ultra-low leakage current of 0.3 μA at 240V/60Hz. It operates with a small-signal bandwidth of 60kHz and supports both unipolar and bipolar configurations using internal reference currents. Packaged in an 18-pin bottom-braze DIP, it functions as a current-to-voltage converter or voltage amplifier with external resistors.

Feature Summary

• Optical coupling mechanism utilizing matched LED and photodiode detectors for signal transfer across the isolation barrier.
• Active laser trimming ensures excellent tracking between input and output stages with low offset errors.
• Supports versatile operation modes including noninverting and inverting configurations for both unipolar and bipolar signals.
• Provides two precision internal current sources to facilitate bipolar operation and external circuit flexibility.

Applications

• Industrial process control transducer sensing such as thermocouples, RTDs, and pressure bridges.
• Isolated 4mA to 20mA loop transmitter circuits.
• Motor and SCR control systems requiring galvanic isolation.
• Biomedical measurement equipment needing high safety isolation.
• Test equipment and data acquisition systems eliminating ground loops.

Procurement Notes

Verify component status carefully as the ISO100AP is listed as Not Recommended for New Designs (NRND) in official documentation. Confirm availability through lifetime-buy periods if sourcing for new production. Ensure handling precautions are observed due to electrostatic discharge sensitivity inherent to precision integrated circuits. Validate package type matches the 18-pin bottom-braze DIP specification required for your board layout.

Selection Notes

Select the ISO100AP when high DC accuracy and low drift are critical for isolation applications. Consider its 60kHz bandwidth sufficient for most industrial sensor signals. Evaluate whether unipolar or bipolar operation suits your signal range, noting that bipolar mode introduces additional noise from reference currents. Ensure power supply requirements of ±15V are met for rated performance. Check absolute maximum ratings for isolation voltage limits under varying temperature conditions.

Part Context

The ISO100 series represents an early generation of optically coupled isolation amplifiers designed by Burr-Brown before its acquisition by Texas Instruments. These devices were engineered to replace transformer-coupled isolators by offering superior low-frequency response and DC stability. The ISO100AP specifically denotes the commercial grade variant within the family, characterized by specific offset and gain error tolerances defined in the datasheet specifications table.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided source material. The ISO100AP is marked as NRND; consult manufacturer obsolescence notices for potential modern replacements.