ISO121BG

Overview

The ISO121BG is a precision, low-cost isolation amplifier manufactured by Texas Instruments. It features galvanic isolation with a 3500 Vrms insulation voltage and operates on a single supply ranging from 4.5 V to 18 V. The device provides a 60 kHz bandwidth and a common-mode rejection ratio of 115 dB. It has a maximum input offset voltage of 100 mV and draws 6.5 mA of operating current. Packaged in a 16-lead CDIP (DIP-40 style) for through-hole mounting, it supports an operating temperature range from -55°C to +125°C.

Feature Summary

• Provides galvanic isolation for signal transmission between different ground potentials
• Delivers high common-mode rejection to suppress noise in industrial environments
• Operates within a wide industrial temperature range for robust performance

Applications

• Industrial process control systems requiring isolated sensor interfaces
• Medical equipment needing patient isolation for safety compliance
• Data acquisition modules in noisy electrical environments

Procurement Notes

Verify the specific package variant when ordering, as the suffix 'BG' denotes a 16-lead CDIP package. Confirm RoHS compliance status directly with the manufacturer or authorized distributors, as regulatory updates may affect production batches. Ensure the procurement channel is an authorized TI partner to guarantee component authenticity and traceability. Check for any recent lifecycle notices regarding obsolescence or alternative recommendations before finalizing purchase orders.

Selection Notes

Select this component when a single-channel isolation amplifier with high CMRR is required. It is suitable for applications demanding precise analog signal transfer across isolation barriers. Consider the 60 kHz bandwidth limit for high-speed signal requirements. Evaluate the power supply constraints against the 4.5 V to 18 V operational range. Compare thermal management needs against the specified -55°C to +125°C operating temperature limits.

Part Context

The ISO121BG belongs to the ISO121 family of isolation amplifiers from Texas Instruments. This series is designed to replace traditional optocoupler-based solutions that suffer from non-linearities and limited lifespan. The device integrates precision analog circuitry with capacitive isolation technology to provide reliable signal transmission in harsh electromagnetic environments.

FAQ

What is the maximum insulation voltage of the ISO121BG?

The ISO121BG supports an insulation voltage of 3500 Vrms.

Does the ISO121BG support single-supply operation?

Yes, the device operates on a single supply voltage ranging from 4.5 V to 18 V.