UAF42AUG4

Overview

The UAF42AUG4 is a universal active filter integrated circuit manufactured by Texas Instruments, housed in a 16-pin SOIC surface-mount package. It utilizes a classic state-variable topology comprising an inverting amplifier and two integrators to implement complex filter functions. The device integrates two on-chip 1000pF capacitors trimmed to 0.5% tolerance, addressing the challenge of obtaining tight-tolerance low-loss capacitors. It supports loss, high-pass, band-pass, and band-reject configurations within a specified operating temperature range.

Feature Summary

• Integrates two precision 1000pF capacitors with 0.5% trimming for accurate frequency response
• Supports versatile filter topologies including loss, high-pass, band-pass, and band-reject
• Employs a state-variable architecture with an inverting amplifier and dual integrators
• Includes an uncommitted FET-input operational amplifier for additional stages or specialized filters

Applications

• Test equipment signal conditioning
• Communication equipment filtering
• Medical instrumentation analog front-ends
• Data acquisition systems noise rejection

Procurement Notes

Verify the specific suffix 'G4' against the official Texas Instruments datasheet to confirm lead-free status and RoHS compliance details. Ensure the 16-SOIC package dimensions match the target PCB footprint. Confirm availability status as production data may vary over time.

Selection Notes

Select this component when designing second-order active filters requiring precise capacitor matching without external components. The integrated 1000pF capacitors simplify design compared to discrete solutions. Consider the available uncommitted op-amp if higher-order filtering or specific gain requirements are needed beyond the primary state-variable section.

Part Context

The UAF42 belongs to the Universal Active Filter family from Texas Instruments, originally developed by Burr-Brown. This series allows designers to implement various filter responses using a single monolithic chip. The UAF42 variant specifically offers a 16-pin SOIC option alongside the 14-pin DIP, providing flexibility for surface-mount assembly designs.

Replacement Considerations

Publicly confirmed direct substitute part numbers for the UAF42AUG4 are not available in the provided documentation. Designers should consult the manufacturer's current replacement guide or evaluate similar universal active filters such as the UAF41 or UAF21 based on pin compatibility and electrical specifications.