ISO103B

Overview

The ISO103B is a low-cost, internally powered isolation amplifier housed in a 24-pin double-wide side-brazed ceramic DIP package. It provides both signal and power across an isolation barrier with a 1500Vrms continuous AC rating and 5600Vpk test voltage. The device features a wide input signal range of ±10V to ±15V and a bandwidth of 20kHz for both small signal and full power applications. Built-in isolated power supplies ±50mA output from a ±10V to ±18V input. Key electrical specifications include a nominal gain of 1 V/V, initial error of ±0.15% FSR, and input offset voltage of ±60mV.

Feature Summary

• Integrates signal transmission and isolated power delivery within a single hybrid package using transformer-coupled DC/DC conversion and capacitor-coupled signal channels.
• Supports multichannel synchronization via TTL clock signals to eliminate beat frequency interference in multi-unit systems.
• Includes an Enable control pin to disable the transformer drive while maintaining signal demodulation, reducing quiescent current for low-power operation.

Applications

• Multichannel isolated data acquisition systems
• Isolated 4-20mA loop receivers and power distribution
• Power supply and motor control circuits
• Ground loop elimination in industrial instrumentation

Procurement Notes

Verify component status as NRND (Not Recommended for New Designs). Confirm package type matches CDIP SB JVB requirements. Ensure design accounts for discontinued status if new production is planned. Check latest datasheet revisions for any parameter updates before finalizing procurement specifications.

Selection Notes

Select this component when simultaneous signal isolation and isolated power generation are required in a compact footprint. Consider the 20kHz bandwidth and ±10V input range against application needs. Evaluate the need for multichannel synchronization capabilities and verify compatibility with existing TTL clock sources for system integration.

Part Context

The ISO103B belongs to the ISO103 family of precision isolation amplifiers manufactured by Burr-Brown, now part of Texas Instruments. These devices utilize proprietary oscillator chips and laser-trimmed transmitter-receiver pairs to achieve high linearity and reliability. The family is designed for applications requiring robust galvanic isolation with integrated power conversion.

Replacement Considerations

Public confirmed substitute part numbers: None identified in source material.