Background
The demand of cost sensitive portable products such as
cellular telephones has resulted in the development of the
ON Semiconductor NZMM7V0T4 Integrated Passive
Device (IPD) EMI filter with ESD protection. This
integrated filter array is used to replace low pass filters that
have been implemented with discrete resistors, capacitors,
and zener diodes. The filters, as shown in Figures 1, 2 and
3, use the capacitance of a zener diode to form a
resistor/capacitor (RC) low pass Pi filter. An IPD IC will
reduce the component count and the required printed circuit
board space. Also, this filter solution offers the advantage
that it is manufactured using standard integrated circuit
manufacturing processes to achieve a low cost solution in a
small IC package.
The NZMM7V0T4 multiple channel filter array, as shown
in Figure 5, is the first member of a new family of IPD EMI
filters that will include single, dual, and multiple filter arrays
with various cut-off frequencies (f-3dB ). The NZMM7V0T4
was developed to protect cellular telephone I/O connectors;
however, this IC can provide a low cost EMI and ESD filter
solution for a wide range of applications. The ON
Semiconductor family of IPD EMI filters also consists of a
single and a dual channel filter. The NZF220TT1 is the single
channel device and is available in a three pin SC-75 package.
The NZF220DFT1 is the dual channel device and is available
in a five pin SC-88A package. Both the single and the dual
channel devices are functionally identical to the nine channel
NZMM7V0T4 filter array.
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