ISO122U/1K

Overview

The ISO122U/1K is a precision isolation amplifier from the Texas Instruments ISO122 series, housed in an 8-SOIC package. It features capacitive and galvanic isolation with a rated insulation voltage of 1500 Vrms. The device operates on a single supply voltage ranging from 4.5 V to 18 V, consuming 14 mA of operating current. Key electrical specifications include a 3dB bandwidth of 50 kHz, a common-mode rejection ratio (CMRR) of 140 dB, and an input offset voltage (Vos) of 20 mV. The gain error is specified at 0.02%, and it provides an output current capability of 15 mA per channel.

Feature Summary

• Provides high-precision signal amplification with integrated galvanic isolation for noise reduction.
• Utilizes capacitive isolation technology to ensure safety and signal integrity across potential differences.
• Delivers high common-mode rejection capabilities to maintain accuracy in noisy environments.

Applications

• Industrial process control systems requiring isolated sensor interfaces
• Medical equipment needing patient isolation protection
• Data acquisition systems with ground loop elimination requirements

Procurement Notes

Verify the specific suffix '1K' against the manufacturer's latest datasheet to confirm reel packaging specifications and moisture sensitivity level. Ensure compatibility with the required SOIC-8 footprint and check for any RoHS compliance updates or environmental declarations relevant to your region before finalizing procurement orders.

Selection Notes

Select this component when a balance of precision and cost-effectiveness is required for single-channel isolation. Compare the 50 kHz bandwidth and 14 mA current consumption against higher-speed or lower-power alternatives like the ISO124 if system constraints differ. Verify that the 1500 Vrms isolation rating meets the safety standards of the target application.

Part Context

This part belongs to the ISO12x family of low-cost precision isolation amplifiers designed by Texas Instruments. It shares architectural similarities with the ISO124 but offers distinct performance trade-offs regarding power consumption and offset voltage. The family targets applications where traditional optocouplers lack sufficient linearity or speed.

Replacement Considerations

The ISO122UE4 serves as a lead-free replacement variant within the same functional family. Cross-reference pinouts and electrical parameters carefully when substituting with other isolation amplifier models to ensure thermal and electrical compatibility.