3656HG

Overview

The Texas Instruments 3656HG is a transformer-coupled isolation amplifier housed in a 20-lead ceramic DIP package. It features a 30 MHz bandwidth and supports a minimum insulation voltage of 2000 V. The device operates with supply voltages ranging from 8.5 V to 16 V, typically utilizing ±15 V rails. Designed for high-speed signal transmission across isolation barriers, it provides galvanic separation while maintaining signal integrity in demanding industrial environments.

Feature Summary

• Transformer coupling enables high-frequency signal isolation without magnetic saturation issues
• High bandwidth capability supports fast transient response and wide signal processing ranges
• Robust ceramic packaging ensures reliable operation under harsh thermal and mechanical conditions

Applications

• Industrial process control systems requiring high-voltage isolation
• Medical equipment needing patient safety isolation barriers
• Power electronics monitoring and gate drive circuits

Procurement Notes

Verify the specific suffix (HG) against the manufacturer's current datasheet to confirm pinout and electrical specifications. Check RoHS compliance status as older variants may not meet current environmental standards. Confirm availability through authorized distributors, as this component may be subject to limited stock or end-of-life restrictions depending on the production batch.

Selection Notes

Select this component when high-speed isolation is required alongside significant voltage separation. Ensure the system design accommodates the necessary bipolar power supplies for optimal performance. Consider the physical dimensions of the CDIP-20 package during PCB layout planning to ensure adequate clearance for isolation creepage distances.

Part Context

This part belongs to the Texas Instruments 3656 series of isolation amplifiers. These devices utilize transformer coupling technology to achieve electrical isolation between input and output stages. The series is designed for applications where traditional optocouplers or capacitive isolators may lack sufficient bandwidth or linearity.

Replacement Considerations

Direct replacements are limited due to the specific transformer-coupled architecture. Verify compatibility with alternative isolation amplifiers by comparing bandwidth, isolation voltage ratings, and package dimensions. Consult the manufacturer's obsolescence notices for recommended upgrade paths.