UM4701/4711/8701/8711
Multi-line ESD/EMI Protection for Color LCD Interfaces
UM4701 DFN8 2.0×2.0
UM4711 DFN8 1.7×1.3
UM8701 DFN16 4.0×1.6
UM8711 DFN16 3.3×1.3
General Description
The UM4701/UM4711/UM8701/UM8711 is a (L-C) low pass filter array with integrated TVS
diodes. It is designed to suppress unwanted EMI signals and provide electrostatic discharge (ESD)
protection in portable electronic equipment. This device utilizes solid-state silicon-avalanche
technology for superior clamping performance and DC electrical characteristics. They have been
optimized for protection of color LCD and camera lines in cellular phones and other portable
electronics.
The device consists of identical circuits comprised of TVS diodes for ESD protection, and a 5
pole inductor-capacitor network for EMI filtering. A typical inductor value of 19nH and a
capacitor value of 12pF are used to achieve 30dB minimum attenuation from 800MHz to 2.7GHz.
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 UM4701 is in a RoHS compliant DFN8 2.0×2.0 package, the UM4711 is in a RoHS compli-
ant DFN8 1.7×1.3 package, the UM8701 is in a RoHS compliant DFN16 4.0×1.6 package and the
UM8711 is in a RoHS compliant DFN16 3.3×1.3 package. The leads are finished with lead-free.
The small package makes it ideal for use in portable electronics such as cell phones, digital still
cameras, and PDAs.
Applications
Color LCD Protection
Cell Phone CCD Camera Lines
Clamshell Cell Phones
Features
Bidirectional EMI Filter with Integrated TVS
for ESD Protection
ESD Protection to IEC 61000-4-2 (ESD)
Level 4, ±15kV (air), ±8kV (contact)
Filter performance: 30dB minimum
attenuation from 800MHz to 2.7GHz
TVS Working Voltage: 5V
Inductor: 19nH (Typical)
Capacitors: 12pF (Typical at V
R
= 2.5V)
Protection and filtering for multi lines
UM4701/4711: four lines
UM8701/8711: eight lines
Solid-state Technology
Ordering Information
Part
Number
UM4701
UM4711
UM8701
UM8711
Working
Voltage
5.0V
5.0V
5.0V
5.0V
Packaging
Type
DFN8 2.0×2.0
DFN8 1.7×1.3
DFN16 4.0×1.6
DFN16 3.3×1.3
Channel
4
4
8
8
Marking
Code
ABB
AR
8701
8711
Shipping Qty
3000pcs /7Inch
Tape & Reel
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UM4701/4711/8701/8711
Pin Configurations
Top View
Device Schematic (4X)
M: Month Code
UM4701
DFN8 2.0×2.0
Device Schematic (4X)
M: Month Code
UM4711
DFN8 1.7×1.3
XX: Week Code
UM8701
DFN16 4.0×1.6
Device Schematic (8X)
XX: Week Code
UM8711
DFN16 3.3×1.3
Device Schematic (8X)
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UM4701/4711/8701/8711
Absolute Maximum Ratings
PARAMETER
ESD per IEC 61000-4-2(Air)
ESD per IEC 61000-4-2(Contact)
Junction Temperature
Operating Temperature Range
Storage Temperature Range
SYMBOL
V
ESD
T
J
T
OP
T
STG
VALUE
+/- 20
+/- 15
125
-40 to 85
-55 to 150
UNIT
kV
°C
°C
°C
Electrical Characteristics
( T
J
=25
℃
unless otherwise noted)
PARAMETER
SYMBOL
TVS Reverse Stand-Off
V
RWM
Voltage
TVS Reverse
V
BR
Breakdown Voltage
TVS Reverse Leakage
I
R
Current
DC Resistance
R
cc
Roll-off frequency at
f
R
-6dB Attenuation
Filter Cut-Off Frequency
Inductance
Total series Inductance
Capacitance
Total Capacitance
fc
L
L
1
+L
2
Cd
C
total
Each Line
V
R
=2.5V,f=1MHZ
Input to Gnd,
Each Line
V
R
=2.5V,f=1MHZ
CONDITIONS
MIN
TYP
MAX
5
It = 1mA
V
RWM
= 3.3V
18
Zsource = Z
load
= 50Ω
Zsource = Z
load
= 50Ω
300
150
19
38
12
36
15
45
6
8
10
0.1
UNIT
V
V
μA
Ω
MHZ
MHZ
nH
nH
pF
pF
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UM4701/4711/8701/8711
Typical Operating Characteristics
Typical Insertion Loss
Analog Crosstalk
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Applications Information
Insertion Loss
Insertion Loss (IL) is used to describe the transmission coefficient between two points in a circuit
often described in terms of dB. When examining S parameters, S21 is often described as insertion
loss. Insertion Loss and S21 will be used interchangeably from here on out. The insertion loss of a
circuit with VOUT and VIN would be expressed as
IL = S
21
(dB) = 20log (V
OUT
/V
IN
)
The setup for measuring insertion loss in a 50
Ω
system is shown in the figure below. It will be
analyzed in a 50Ω environment, so the source impedance and load impedance is 50
Ω.
The
transfer functions then can be analyzed in terms of insertion loss (S21).
Test Conditions:
Source Impedance = 50Ω
Load Impedance = 50Ω
Input Power = 0dBm
Cut Off Frequency
Cut off Frequency is the frequency at which the signal strength is 3.0 dB less than it is Pass Band
3.0 dB of attenuation equates to half the original signal power. The Pass Band is the range of
frequencies that are allowed to “pass” through a filter with minimal attenuation. For our purposes
it starts from DC and ends at the cut off frequency.
Device Connection
The UM4701/UM4711/UM8701/UM8711 is comprised of identical circuits consisting of a low
pass filter for EMI suppression and dual TVS diodes for ESD protection. The device is in an 8-pin
DFN and 16-pin DFN package. Electrical connection is made to all the pins located at the bottom
of the device. A center tab serves as the ground connection. The device has a flow through design
for easy layout. All path lengths should be kept as short as possible to minimize the effects of
parasitic inductance in the board traces.
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