UAF42AP

Overview

The UAF42AP is a universal active filter in a 14-pin plastic DIP package, specified for operation between -25°C and +85°C. It utilizes a state-variable analog architecture with an inverting amplifier and two integrators containing on-chip 1000pF capacitors trimmed to ±0.5%. The device supports low-pass, high-pass, band-pass, and band-reject configurations with a frequency range up to 100 kHz. Key electrical characteristics include a maximum Q of 400, a (Q • Frequency) product of 500 kHz, and a slew rate of 10 V/ms. Power supply requirements are ±6V to ±18V, with typical operating current of ±7 mA.

Feature Summary

• Monolithic state-variable topology providing accurate frequency and Q control via integrated precision capacitors
• Versatile configuration capability supporting low-pass, high-pass, band-pass, and band-reject filter types
• Time-continuous signal processing free from switched-capacitor anomalies and switching noise

Applications

• Test equipment signal conditioning
• Medical instrumentation filtering
• Data acquisition systems
• Communications equipment

Procurement Notes

Verify the specific ordering suffix against the latest Package Option Addendum to confirm package type and lead finish. Ensure the component status is listed as ACTIVE for new designs. Confirm that the environmental classification meets project requirements, such as Green (RoHS & no Sb/Br). Cross-reference the manufacturer part number with official Texas Instruments documentation to validate authenticity before procurement.

Selection Notes

Select the UAF42AP when a monolithic solution for second-order filter sections is required without external timing capacitors. The device is suitable for applications needing precise frequency response stability due to factory-trimmed internal components. Consider the 14-pin PDIP package for through-hole implementations where surface-mount options are not feasible. Evaluate the ±18V maximum supply voltage against available system rails.

Part Context

The UAF42AP serves as a direct pin-compatible replacement for the UAF41, offering improved performance metrics. It features a significantly higher slew rate of 10 V/ms compared to the UAF41's 1.6 V/ms. The natural frequency range is extended by a factor of four, reaching up to 100 kHz. This evolution maintains the classic state-variable architecture while enhancing speed and bandwidth capabilities for modern analog filter designs.

Replacement Considerations

The UAF42APG4 is the RoHS-compliant equivalent of the UAF42AP. Both parts share identical electrical specifications and pinouts. Verify that the G4 suffix does not alter functional parameters, as it primarily indicates lead-free manufacturing compliance.