EMI suppressors, TTI, Murata

Small signal line EMI suppressors

News Release from: TTI Inc.
13/09/2007

Now available through TTI is Murata's new family of BLM02 signal line EMI suppressors featuring nominal dimensions of only 0.4x0.2x0.2mm, matching size reductions of other passive components. The industry's smallest EMI suppresser design has been enabled by Murata's advanced technology reducing the footprint of its smallest chip ferrite beads by about 40% and the volume by 30%.

New BLM02 devices provide EMI suppression and prevention of abnormal oscillation in cellular phone power amplifier modules and other space-limited designs that are increasingly popular. The small chip ferrite beads function almost like resistors at noise frequencies. They greatly reduce the danger of resonance and leave signal resonance and signal waveforms undistorted. The new beads are especially useful when no stable ground-line is available because they require no ground connection.

Generating impedance from relatively low frequencies, BLM02 series EMI suppressers are effective in noise suppression over a wide frequency range (typically 30MHz to several hundred MHz). Murata offers nominal values of 10, 70 and 120ohms, with rated currents of 500, 250 and 200mA respectively. Maximum DC resistance values are 0.1, 0.5 and 0.8 ohms and the operating temperature range is -55 up to +125 degrees Celsius. Pb-free Nickel-barrier external electrodes provide excellent soldering heat resistance for reflow soldering.

The small size of BLM02 components yields a 33% reduction in reel-changes due to the increased capacity from the size reduction. The devices come packaged paper tape with 20,000 pieces.