Murata, DSS9, Signal Filter, 250 V dc, 6A, Through Hole, Radial, 12 x 7.5 x 10.5mm

Unlike conventional two terminal capacitors which have high residual inductance within the lead wires, thereby impeding the path of high frequency noise to ground, a three terminal capacitor forms a T-filter providing high inductance in series with the line, via two integral ferrite beads, and low inductance to ground via the bypass capacitor. Thus they provide increased attenuation with frequency over conventional decoupling capacitors

Note: See 'key characteristics' table for details of effective frequency ranges

High frequency noise suppression for d.c. power lines
Noise suppression in digital high impedance circuits
Noise suppression in high speed digital signals (clocks etc.)
Noise suppression in video IF signals