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KYOCERA Launches KVA21 Series Quad EMI Filter Array with ESD Protection

June 26, 2007

Kyocera Corporation is pleased to introduce the KVA21 quad EMI filter array, a compact, RoHS compliant, distributed constant type component featuring both electromagnetic interference (EMI) filtering and electrostatic discharge (ESD) protection in a single package. The new units, measuring only 2.0 x 1.25 x 0.7 mm (typ.), will be available in sample quantities beginning in July, and go to volume production in August.

Quad EMI Filter Arrays with ESD Protection
Quad EMI Filter Arrays with ESD Protection

The KVA21 series features Kyocera's new varistor material, replacing the dielectric ceramic used in previous KNA series filters. The varistor has been optimized using advanced electromagnetic simulation to combine ESD protection with EMI filtering, offering the same high level of filtering performance as before and smaller package size for integration on the circuit board.

Kyocera and affiliate AVX developed the EMI filters with the varistor function based on AVX advanced material technology. Circuits with the new material were designed with advanced electromagnetic field simulation, optimizing the L (inductors) and C (capacitors) layout on the filter array. The result is an 8 kV ESD contact discharge - in accordance with IEC/EN 61000-4-2.

The KVA21 series also offers attenuation characteristics exceeding 30dB over the wide and on the high-frequency band by distributed-constant LC filter. Even with the added function of ESD protection, over the 800MHz to 2.0 GHz band with minimal insertion loss equivalent to the conventional products.

The KVA21's optimized monolithic LC filter also offers higher reliability and complies with the RoHS directive.

KVA21 Series Overview
Type: Multilayer EMI filter array with ESD protection
Product Name:KVA21 Series
Size: 2.0 x 1.25 x 0.7 mm (typ.) (JIS code: 2012)
Manufactured at: Kokubu plant, Kagoshima Japan
Production capacity: 10 million units / month (as of August 2007)

(Static electric discharge resistance +-8 kV contact discharge, as per IEC/EN 61000-4-2 compliance)

Part number

Cut off frequency



Rated voltage

Varistor voltage

800 - 1000 MHz

1.0 - 2.5 GHz




30dB min

20dB min






30dB min

20dB min