ISO113B

Overview

The ISO113B is a low-cost, high-voltage output isolation amplifier featuring an internally powered transformer-coupled DC/DC converter and a capacitor-coupled signal channel within a double-wide ceramic DIP package. It provides a continuous AC barrier rating of 1500Vrms and supports a wide bandwidth of 20kHz for both small-signal and full-power operation. The device delivers built-in isolated output power with ±50mA current drive capability from ±10V to ±18V input supplies. Key electrical specifications include a nominal gain of 1 V/V, an initial gain error of ±0.5% FSR, and an input offset voltage of ±60 mV. Operating temperature range is specified from -25°C to +85°C.

Feature Summary

• Self-contained design providing both signal transmission and isolated output power across the barrier without external transformers.
• Capacitor-coupled signal channel combined with transformer-coupled power conversion ensures galvanic isolation.
• Multichannel synchronization capability allows multiple units to operate on a common clock to eliminate beat frequency interference.
• Enable control feature permits reduction of quiescent current by disabling the transformer drive while maintaining signal modulation.

Applications

• 4mA to 20mA current/voltage converters
• Motor and valve controllers
• Isolated recorder outputs
• Medical instrumentation outputs
• Gas analyzers

Procurement Notes

Verify component status as NRND (Not Recommended for New Designs). Confirm package type matches Double-Wide Ceramic DIP requirements. Ensure supply voltages remain within ±10V to ±18V limits. Check that isolation barrier voltage stress does not exceed 1500Vrms continuous rating. Validate synchronization pin connections if multi-channel setups are utilized.

Selection Notes

Select this component for applications requiring integrated isolated power and signal transmission in a compact form factor. Consider the 20kHz bandwidth limit for high-speed signal processing needs. Evaluate the ±50mA output current capacity against load requirements. Assess thermal management capabilities within the -25°C to +85°C operating range. Verify compatibility with TTL synchronization signals if multiple channels are deployed.

Part Context

The ISO113B belongs to the ISO113 family of output isolation amplifiers manufactured by Burr-Brown, now part of Texas Instruments. It utilizes a proprietary 800kHz oscillator and laser-trimmed transmitter-receiver pairs coupled through matched fringe capacitors. The device integrates a square core wirebonded transformer for power delivery, distinguishing it from standard optocoupler-based isolators by providing regulated auxiliary power to the secondary side.

Replacement Considerations

No direct public substitute part numbers are confirmed in the provided documentation. The ISO113 is listed as NRND; consult manufacturer archives for legacy support options or modern equivalents with similar isolation ratings and integrated power features.