ISO122JUE4

Overview

The ISO122JUE4 is a precision isolation amplifier from the ISO122 family, manufactured by Texas Instruments. It utilizes duty cycle modulation-demodulation to transmit signals across a 2-pF differential capacitive barrier. The device features a 50-kHz signal bandwidth and 140 dB common-mode rejection at 60 Hz. It operates with a supply range of ±4.5 V to ±18 V and provides a bipolar output voltage of ±10 V. Key electrical specifications include a maximum nonlinearity of 0.020%, an initial input offset voltage of ±20 mV, and a quiescent current of approximately 7 mA per side. The component is rated for 1500 Vrms continuous isolation voltage.

Feature Summary

• Galvanic isolation via digital transmission across an embedded capacitive barrier
• Fixed unity gain configuration requiring no external components
• High common-mode rejection ratio ensuring signal integrity
• 100% tested for high-voltage breakdown reliability

Applications

• Industrial process control transducer isolators
• Thermocouple, RTD, pressure bridge, and flow meter isolation
• 4-mA to 20-mA loop isolation
• Ground loop elimination in measurement systems
• Motor and SCR control circuits

Procurement Notes

Verify the specific package type corresponding to the suffix 'UE' against the manufacturer's official orderable addendum. Confirm that the requested variant matches the required thermal and mechanical specifications for the target PCB layout. Ensure compatibility with the system's isolation voltage requirements and operating temperature range before finalizing procurement.

Selection Notes

Select this component when a low-cost, precision isolation solution with fixed unity gain is required. It is suitable for applications needing high common-mode immunity and a 50-kHz bandwidth. Consider the available package options, such as plastic DIP or surface-mount SOIC, based on assembly constraints. Verify that the ±10 V output swing meets the downstream circuit requirements.

Part Context

The ISO122 series represents a line of precision lowest-cost isolation amplifiers designed for robust industrial environments. These devices integrate both modulator and demodulator sections within a single package, eliminating the need for external isolation components. The technology relies on matched internal capacitors to maintain high-frequency transient immunity and long-term reliability across the isolation barrier.

Replacement Considerations

Consult the official datasheet for the complete list of orderable addenda. The ISO122U is the surface-mount equivalent in the SOIC-28 package. Other variants within the ISO122 family may offer different pin counts or packaging styles but share the same core functionality.