ISO121G

Overview

The ISO121G is a precision, low-cost isolation amplifier manufactured by Texas Instruments. It features galvanic isolation with a rated insulation voltage of 3500 Vrms and a 60 kHz bandwidth. Key electrical parameters include a common-mode rejection ratio (CMRR) of 115 dB, an input offset voltage (Vos) of 100 mV, and a gain error of 0.01%. The device operates on a single supply voltage ranging from 4.5 V to 18 V, drawing a typical operating current of 6.5 mA. It is housed in a DIP-40 package and supports through-hole mounting.

Feature Summary

• Provides high-performance galvanic isolation for signal integrity in noisy environments
• Delivers precision amplification with minimal gain error and high common-mode rejection
• Supports flexible power configurations with wide single-supply voltage operation

Applications

• Industrial process control systems requiring isolated sensor signal conditioning
• Medical equipment needing patient isolation for safety compliance
• Power electronics monitoring circuits involving high-voltage differential measurements

Procurement Notes

Verify the manufacturer designation carefully, as Texas Instruments acquired Burr Brown. Confirm the specific suffix 'G' corresponds to the required RoHS-compliant lead-free packaging and material composition. Ensure the DIP-40 package type matches your PCB footprint requirements before ordering.

Selection Notes

Select this component when high CMRR and low gain error are critical for accurate signal transmission across isolation barriers. Consider the 60 kHz bandwidth limit for high-speed applications. Evaluate the DIP-40 package constraints against available board space and thermal dissipation needs for the intended operating environment.

Part Context

This part belongs to the ISO121 family of isolation amplifiers. It serves as a bridge between high-voltage domains and low-voltage processing circuits, ensuring safety and accuracy. The device integrates precision analog front-end circuitry with capacitive isolation technology within a standard dual in-line package format.

Replacement Considerations

Consult official substitution guides for compatible alternatives within the same isolation amplifier family or equivalent performance tiers.