MMZ-E Chip Beads TDK MMZ-E Chip Beads offer the same noise-reduction features as the MMZ series, but also increase SRF to GHz bands and countermeasure noise at wide frequencies. TDK MMZ-E series chip beads attain high impedance at GHz bands and offer a variety of frequency characteristics and materials to countermeasure against general signals, high-speed signals, and more. The series also features a -55°C to +125°C operating temperature range.