PRELIMINARY
CM1637
4, 6 and 8 Channel EMI Filter Arrays with ESD Protection
Features
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Four, six and eight channels of EMI filtering with
ESD protection
Pi-style EMI filters in a capacitor-resistor-capacitor
(C-R-C) network
±15kV
ESD protection (IEC 61000-4-2, contact
discharge)
±30kV
ESD protection (HBM)
Greater than 25dB of attenuation from 800MHz to
3GHz
UDFN package with 0.40mm lead pitch:
• 4-ch. = 8-lead UDFN
• 6-ch. = 12-lead UDFN
• 8-ch. = 16-lead UDFN
Tiny UDFN package size:
• 8-lead: 1.7mm x 1.35mm x 0.5mm
• 12-lead: 2.5mm x 1.35mm x 0.5mm
• 16-lead: 3.3mm x 1.35mm x 0.5mm
Increased robustness against vertical impacts
during manufacturing process
Lead-free finishing
Product Description
California Micro Devices's CM1637 is an EMI filter
array with ESD protection, which integrates either four,
six or eight pi filters (C-R-C). Each CM1637 filter has
component values of 7.5pF-200
Ω
-7.5pF. These parts
include ESD protection diodes on every pin, providing
a very high level of protection for sensitive electronic
components that may be subjected to electrostatic dis-
charge (ESD). The ESD diodes connected to the filter
ports safely dissipate ESD strikes of
±15kV
contact dis-
charge, twice the specification requirement of the IEC
61000-4-2, Level 4 international standard. Using the
MIL-STD-883 (Method 3015) specification for Human
Body Model (HBM) ESD, the pins are protected for
contact discharges at greater than
±30kV.
This device is particularly well-suited for portable elec-
tronics (e.g. mobile handsets, PDAs, notebook com-
puters) because of its small package and easy-to-use
pin assignments. In particular, the CM1637 is ideal for
EMI filtering and protecting data lines from ESD in
wireless handsets.
The CM1637 is available in space-saving, ultra-low-
profile, 8-lead, 12-lead and 16-lead 0.4mm pitch UDFN
packages. It is fabricated with California Micro Devices'
Centurion
™
process and available with lead-free finish-
ing. This new small UDFN package provides up to 42%
board space savings vs. the 0.50mm pitch UDFN pack-
ages.
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Applications
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I/O port protection for mobile handsets, notebook
computers, PDAs etc.
EMI filtering for data ports in cell phones, PDAs or
notebook computers.
EMI filtering for LCD, camera and chip-to-chip data
lines
Electrical Schematic
200Ω
FILTERn*
7.5pF
C
R
FILTERn*
7.5pF
C
GND
1 of 4/6/8 EMI Filtering + ESD Channels
* See Package/Pinout Diagram for expanded pin information.
© 2006 California Micro Devices Corp. All rights reserved.
09/20/06
490 N. McCarthy Blvd., Milpitas, CA 95035-5112
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Tel: 408.263.3214
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Fax: 408.263.7846
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www.cmd.com
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CALMIRCO [ CALIFORNIA MICRO DEVICES CORP ]
