Ferrite-chip beads suppress supply, signal-line noise

Ferrite beads are the near-ideal component. They are easy to use, solve a nasty problem, and have minimal drawbacks. Two new product families illustrate these features (Picture). Taiyo Yuden has added 0603 case-size parts to its inventory with the FBMH series, targeting higher currents typical of power-supply lines. Intended for noise in the high-megahertz and the low-gigahertz range, the surface-mount beads withstand currents as high as 2A for the 150Ω part and 1.5A for the 220Ω version. The parts tout 0.050 and 0.070Ω dc resistance, respectively, to minimize supply-line IR loss and self-heating. The devices cost 45 cents each (OEM quantities).

For noise in signal lines, the KOA Speer Electronics FBA array family, in 1206-case size, features multiple circuits in a single package to reduce your board-space and assembly-time requirements. RF impedance is 30 to 1000Ω at 100 MHz, depending on unit. These chip beads operate at –55 to +125°C and have an insulation resistance of at least 1 GΩ.

Taiyo Yuden USA Inc, www.t-yuden.com.

KOA Speer Electronics Inc, www.koaspeer.com.