Development of BGA chip varistor with EMI filter function by TDK
As the smaller form factor for multi functional mobile electronic devices is becoming a market norm, necessitating their further miniaturization and integration of multitude of electronic components with in them.
Further to this, the use of lower voltage operating IC is gaining speed in order to maintain and increase device operating time while limiting their overall power consumption. As a result of creating such compact environment, today’s mobile electronic devices becoming more susceptible to effect of high voltage static electricity resulting in creation of an electrostatic discharge (ESD) countermeasures in preventing malfunction of such devices. Based on this need TDK has developed a chip varistor with a BGA (ball grid array) type terminal which is targeted for mobile devices such as mobile phones, portable music players, digital video cameras, etc. A varistor is an electronic component with a significant non-ohmic current-voltage characteristic. The name is a portmanteau of variable resistor. Each chip contains 30 elements where it can be used to create 10 lie ESD countermeasures resulting in a 33% reduction in mounting area in comparison to previous TDK products. The new chip’s dimension is (2.6 mm × 2.6 mm × 0.65 mm). The planned production capacity according to TDK is 10 million units per month with production to resume sometimes in October of 2009.
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