ISO100CP

Overview

The ISO100CP is an optically-coupled isolation amplifier manufactured by Texas Instruments, housed in an 18-pin bottom-braze DIP package. It provides a continuous isolation voltage of 750V and a test breakdown voltage of 2500V DC. The device features a small-signal bandwidth of 60kHz and operates within a temperature range of -25°C to +85°C. Key electrical specifications include a maximum leakage current of 0.3μA at 240Vrms/60Hz and two internal precision reference currents with a nominal magnitude of 12μA.

Feature Summary

• Optical negative feedback loop ensures high accuracy and linearity through laser-trimmed matched photodiodes.
• Acts as a current-to-voltage converter with configurable unipolar or bipolar operation modes.
• Ultra-low leakage current effectively breaks galvanic connections between input and output commons.
• Integrated dual precision current sources facilitate stable bipolar signal processing.

Applications

• Industrial process control transducer sensing for thermocouples, RTDs, and pressure bridges.
• Isolated 4mA to 20mA current loops in motor and SCR control systems.
• Biomedical measurements requiring patient safety isolation.
• Test equipment and data acquisition systems needing ground loop elimination.

Procurement Notes

Verify the specific suffix CP against the manufacturer's current lifecycle status, as documentation indicates this variant may be classified as Not Recommended for New Designs (NRND). Confirm that the 18-pin bottom-braze DIP package dimensions align with the target PCB footprint requirements. Ensure supply voltages remain within the rated ±15VDC limits to maintain specified performance characteristics.

Selection Notes

Select this component when high-precision analog isolation is required for low-frequency signals up to 60kHz. The device supports both unipolar and bipolar input configurations, making it suitable for various sensor interfaces. Consider the thermal management capabilities of the bottom-braze package if operating near the upper temperature limit. Verify that external resistor values are chosen to keep the output swing within the power supply rails.

Part Context

This part belongs to the ISO100 family of optically-coupled isolation amplifiers designed by Burr-Brown, now part of Texas Instruments. The family includes variants such as the ISO100AP and ISO100BP, differentiated primarily by offset voltage and drift specifications. These devices utilize optical coupling to transfer signals across high-voltage barriers while maintaining excellent tracking and low offset errors.

Replacement Considerations

Public confirmed substitute part numbers: None identified in source material.