ISO100BP

Overview

The ISO100BP 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 ensures galvanic isolation between input and output circuits
• Laser-trimmed matched photodiodes provide excellent tracking and low offset errors
• Supports versatile operation modes including noninverting and inverting configurations
• Integrated precision current sources facilitate bipolar signal processing

Applications

• Industrial process control transducer sensing for thermocouples, RTDs, and pressure bridges
• Isolated 4mA to 20mA loop transmitter circuits
• Biomedical measurement systems requiring patient isolation
• Test equipment and data acquisition systems needing ground loop elimination

Procurement Notes

Verify the specific suffix BP against the manufacturer's current lifecycle status, as documentation indicates this variant may be classified as Not Recommended for New Designs. Confirm that the 18-pin bottom-braze DIP package matches the target PCB footprint requirements. Ensure supply voltages align with the rated ±15VDC performance specifications for optimal accuracy.

Selection Notes

Select this component when high DC accuracy and low drift are critical for isolated signal conditioning. The device is suitable for applications requiring wide bandwidth up to 60kHz. Consider the available unipolar and bipolar operating modes based on the input signal polarity. External resistor selection determines gain, allowing flexibility in circuit design without changing the core isolation component.

Part Context

This part belongs to the ISO100 family of optically-coupled isolation amplifiers. The family includes variants such as ISO100AP and ISO100CP, which share similar functional architectures but may differ in initial offset voltage specifications and temperature drift characteristics. All variants utilize the same 18-pin bottom-braze DIP package and optical isolation principle.

Replacement Considerations

Direct replacements include ISO100AP and ISO100CP from the same product family. Verify pin compatibility and package dimensions before substitution. Note that offset and drift parameters may vary between these variants, potentially requiring recalibration of the external adjustment circuits.