Product details


Vs (Min) (V) 12 Vs (Max) (V) 36 Operating temperature range (C) -25 to 85 open-in-new Find other Frequency converters

Package | Pins | Size

PDIP (N) 14 181 mm² 19.3 x 9.4 SOIC (DW) 16 77 mm² 7.52 x 10.28 open-in-new Find other Frequency converters


    • Low-Pass, High-Pass
    • Band-Pass, Band-Reject
    • Includes On-Chip 1000pF ±0.5% Capacitors
open-in-new Find other Frequency converters


The UAF42 is a universal active filter that can be configured for a wide range of low-pass, high-pass, and band-pass filters. It uses a classic state-variable analog architecture with an inverting amplifier and two integrators. The integrators include on-chip 1000pF capacitors trimmed to 0.5%. This architecture solves one of the most difficult problems of active filter design—obtaining tight tolerance, low-loss capacitors.

A DOS-compatible filter design program allows easy implementation of many filter types, such as Butterworth, Bessel, and Chebyshev. A fourth, uncommitted FET-input op amp (identical to the other three) can be used to form additional stages, or for special filters such as band-reject and Inverse Chebyshev.

The classical topology of the UAF42 forms a time-continuous filter, free from the anomalies and switching noise associated with switched-capacitor filter types.

The UAF42 is available in 14-pin plastic DIP and SOIC-16 surface-mount packages, specified for the –25°C to +85°C temperature range.

open-in-new Find other Frequency converters

Technical documentation

star = Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 6
Type Title Date
* Data sheet Universal Active Filter   datasheet (Rev. B) Oct. 24, 2010
Application note Build a 3-Phase Sine Wave Generator with the UAF42 Oct. 04, 2000
Application note Design a 60Hz Notch Filter with the UAF42 Oct. 04, 2000
Application note Digitally Programmable, Time-Continuous Active Filter Sep. 27, 2000
Application note Filter Design Program For The UAF42 Universal Active Filter Sep. 27, 2000
Application note Simple Filter Turns Square Waves into Sine Waves Sep. 27, 2000

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Design tools & simulation

SBFM007A.ZIP (18 KB) - PSpice Model
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)
SPICE-based analog simulation program
TINA-TI TINA-TI provides all the conventional DC, transient and frequency domain analysis of SPICE and much more. TINA has extensive post-processing capability that allows you to format results the way you want them. Virtual instruments allow you to select input waveforms and probe circuit nodes voltages (...)
document-generic User guide

CAD/CAE symbols

Package Pins Download
PDIP (N) 14 View options
SOIC (DW) 16 View options

Ordering & quality

Information included:
  • RoHS
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​