PROTECTION PRODUCTS
1
www.semtech.com
PRELIMINARY
PROTECTION PRODUCTS - EMIClamp
TM
EClamp3202A
ESD/EMI Protection
for Microphone Ports
Description
Revision 04/15/2004
Schematic & Pin Configuration
Dimensions
Features
The EClamp
TM
3202A is a low pass filter array with
integrated TVS diodes for ESD protection. It is de-
signed to provide bidirectional filtering of EMI/RFI
signals and electrostatic discharge (ESD) protection in
portable electronic equipment. This state-of-the-art
device utilizes solid-state silicon-avalanche technology
for superior clamping performance and DC electrical
characteristics. They have been optimized for use on a
microphone port in cellular phones and other protable
electronics. The EClamp3202A effectively replaces 10
discrete components in a small SC-89 package to
provide ESD protection and EMI filtering. Each device
requires less than 2.9mm
2
of PCB area with a low
profile of only 0.60mm. This small package will protect
and filter up to two lines. This small outline makes the
device especially well suited for portable applications.
The TVS diodes are bidirectional for supporting bipolar
audio signals without distortion. The TVS diodes provide
effective suppression of ESD voltages in excess of 15kV
(air discharge) and 8kV (contact discharge) per IEC
61000-4-2, level 4. The device has very low insertion
loss in the pass band and high attenuation at frequen-
cies ranging from 800MHz to 3GHz. Each line features
two stages of TVS diode protection. They feature large
cross-sectional area junctions for conducting high tran-
sient currents. They offer desirable characteristics for
board level protection including fast response time, low
operating and clamping voltage, and no device degrada-
tion.
Applications
Mechanical Characteristics
Cellular Handsets and Accessories
Cordless Phones
Personal Digital Assistants (PDA's)
Webpads & Handhelds
Notebook
Portable Instrumentation
MP3 Players
Transient protection for data lines to
IEC 61000-4-2 (ESD) 15kV (air), 8kV (contact)
IEC 61000-4-4 (EFT) 40A (5/50ns)
Bidirectional EMI/RFI filter with integrated ESD
protection
Protects two I/O lines
Ultra-small SC-89 package (1.7 x 1.7 x 0.6mm
1.7 x 1.7 x 0.6mm
1.7 x 1.7 x 0.6mm
1.7 x 1.7 x 0.6mm
1.7 x 1.7 x 0.6mm)
requires less than 2.9mm
2
of PCB area
Working voltage: 5V
Low leakage current
Low operating and clamping voltages
Solid-state silicon-avalanche technology
EIAJ SC-89 package
Lead Finish: Matte Tin
Molding compound flammability rating: UL 94V-0
Marking : Marking Code
Weight: 2.9mg (typical)
Packaging : Tape and Reel per EIA 481
0.60
1.70
1.70
1.25
0.30
0.50
3
2004 Semtech Corp.
www.semtech.com
PRELIMINARY
PROTECTION PRODUCTS
EClamp3202A
Typical Characteristics
Typical Insertion loss
Analog Crosstalk
Capacitance vs. Reverse Voltage
ESD Clamping (+8kV Contact)
START . 030 MHz
3
STOP 000 . 000 000 MHz
CH1 S21 LOG
6 dB / REF 0 dB
START . 030 MHz
3
STOP 000 . 000 000 MHz
CH1 S21 LOG
20 dB/ REF 0 dB
136
137
138
139
140
141
142
143
0
1
2
3
4
5
Reverse Volage - V
R
(V)
C
a
p
aci
t
a
n
ce -
C
j
(
pF)
f = 1 MHz
ESD Clamping (-8kV Contact)
4
2004 Semtech Corp.
www.semtech.com
PRELIMINARY
PROTECTION PRODUCTS
EClamp3202A
LOW PASS FILTER
Layout Examples
Equilvalent Circuit Diagram (Each Line)
Applications Information
Device Connection Options
The EClamp3202A provides EMI filtering and ESD
protection in a small SC-89 package for speaker port
applications. The equivalent circuit diagram is shown
below. The layout of the device is designed such that
the data lines can be routed through the device. The
first line pair enters at pins 1 and exits at pins 6. The
second line pair enters at pins 3 and exits at pins 4.
The device is symmetrical so the above connections
may be reversed. Layout examples are shown to the
right.
Option 1
Option 2
Circuit Board Layout Recommendations for Suppres-
sion of ESD.
Good circuit board layout is critical for the suppression
of ESD induced transients. The following guidelines are
recommended:
Place the TVS near the input terminals or connec-
tors to restrict transient coupling.
Minimize the path length between the TVS and the
protected line.
Minimize all conductive loops including power and
ground loops.
The ESD transient return path to ground should be
kept as short as possible.
Never run critical signals near board edges.
Use ground planes whenever possible.
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EClamp-
Audio
Codec
3202A
Micro-
phone
4
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EClamp-
Audio
Codec
3202A
Micro-
phone
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