Knowles Acoustics Rolls Out Zero-Height SiSonic Silicon Microphone

8/19/2004 - Knowles Acoustics, a division of Knowles Electronics LLC, announces the "Zero-Height" SiSonicTM silicon microphone, based on semiconductor technology, is now available for general commercial purchase. The surface mount capability of this new addition to the expanding SiSonicTM product line, makes it ideally suited for mobile phones and other applications where minimal component height is required on one side of the customer's PCB.

Designed for space-sensitive applications, the Zero-Height SMD microphone mounts under the pc board, allowing for a tight spacing between the board and the outer housing of the product. It offers a unique technology by developing a solder connection between the microphone and the customer's PCB to achieve an acoustic seal around the port hole, thus reducing costs and simplifying mechanical and acoustical design.

At 1 kHz, the 1.75 x 6.15 x 3.75-mm omni-directional devices have a nominal sensitivity of -42 dB, an output impedance of less than 100 ohms, and a total harmonic distortion of less than 1% at 100 dB SPL. The zero-height design allows engineers to achieve virtual 'zero additional height' on the top side of their PCB.

The microphone can be assembled using standard automatic pick-n-place equipment, conform to lead-free requirements, and is compatible with typical industry Pb-free solder profiles (260C reflow for 30 seconds maximum). This eliminates off-line hand assembly, bulky and expensive connectors, and associated testing and rework issues/costs typical with traditional ECMs.

"With the release of the Zero-Height SiSonicTM, Knowles Acoustics continues to develop new products and technologies that exceed the demands of our customers in the mobile phone and hand-held electronics market. This revolutionary SMD microphone allows our customers to either reduce the overall package size of their end product, or add in additional features. In addition, they also realize cost savings in manufacturing over traditional ECM's" said Jeffrey Niew, Vice President and General Manager.

SiSonicTM is available with a standard supply voltage range of 1.5 to 5V. It has integrated EMI/RFI protection, an important feature for hand-held communication devices. Another key attribute is the microphone's operating temperature. Compared to the typical rating of below 85C for the ECMs, the SiSonicTM is rated up to 100C.

About Knowles Acoustics
Knowles Acoustics is a division of Knowles Electronics LLC, the world leader in microacoustic technology for the Hearing Health Industry. Leveraging the company's heritage of 50 plus years supplying acoustic expertise to this market, Knowles Acoustics has applied this capability to new markets and customers. Knowles is a leading supplier of acoustic interface solutions, specifically surface mount microphones, subminiature transducers, and microphone arrays. For more information contact Knowles Acoustics, 1151 Maplewood Drive, Itasca, IL 60143; phone 630-250-5935; fax 630-250-5932; or visit

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