Signal Filters

A Signal Filter is a passive component, which allows specific frequency bands to pass and reject other electrical signals, mainly for noise reduction. The design integrates multilayer ceramic capacitors, inductors, dielectric resonators and crystals. The Filter finds use in circuits of audio, video, broadband and communication equipment. Electronic signal processing filter is described to be linear or non-linear, analogue or digital, shift invariance, passive or active circuit. The filter frequency response can be classified as:
  • high-pass
  • low-pass
  • band-pass
  • band-stop
  • notch
  • all-pass filter
  • cut-off frequency.
The order of a filter refers to the slope of the transition to roll-off around the cut-off frequency. A first-order filter responds at -6 dB per octave, a second-order filter decreases at -12 dB, a third-order at -18 dB, on a logarithmic scale. The analogue filter in a linear design of a network synthesis type is known as the Butterworth filter, Chebyshev filter, Elliptic filter, Bessel filter and Gaussian filter.

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Description Price Series Maximum Current Rating Maximum Voltage Rating Mounting Type Operating Frequency Termination Style Package/Case Dimensions Depth Height Length Maximum Operating Temperature Minimum Operating Temperature Capacitance
RS Stock No. 106-5393
Mfr. Part No.NFA21SL806X1A48L
Each (In a Pack of 20)
NFA21SL 20mA 10 V dc Surface Mount - Solder 0805 (2012M) 2 x 1.25 x 0.85mm 1.25mm 0.85mm 2mm +125°C -55°C 75pF
RS Stock No. 105-861
Mfr. Part No.NFM18CC222R1C3D
Each (In a Bag of 25)
NFM18C 700mA 16 V dc Surface Mount - Solder Pad 0603 (1608M) 1.6 x 0.8 x 0.6mm 0.8mm 0.6mm 1.6mm +125°C -55°C -
RS Stock No. 773-8636
Mfr. Part No.0805Y1000102MXTE01
Each (In a Pack of 5)
E01 300mA 100 V dc Surface Mount 220MHz Solder Pad 0805 (2012M) 2 x 1.25 x 1mm 1.25mm 1mm 2mm +125°C -55°C -
RS Stock No. 165-5517
Mfr. Part No.USBDF01W5
Each (On a Reel of 3000)
USBDF - - Surface Mount 30 MHz → 1 GHz (Radiated), 450 kHz → 30MHz (Conducted) Gull Wing SOT323 1.4 x 2.2 x 1mm 2.2mm 1mm 1.4mm +150°C -40°C -