UM4401 - Union Semiconductor

UM4401
4 Line ESD/EMI Protection for Color LCD Interfaces
UM4401 DFN8 2.1×1.6
General Description
The UM4401 is a low pass filter array with integrated TVS diodes. It is designed to suppress
unwanted EMI/RFI signals and provide electrostatic discharge (ESD) protection in portable
electronic equipment. This state-of-the-art device utilizes silicon-avalanche technology for
superior clamping performance and DC electrical characteristics. It has been optimized for
protection of color LCD panels in cellular phones and other portable electronics.
The device consists of four identical circuits comprised of TVS diodes for ESD protection, and a
RC network for EMI filtering. A series resistor value of 100Ω and a capacitance value of 10pF are
used to achieve 25dB minimum attenuation from 800 MHz to 2.5GHz. 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 UM4401 is in a 8-pin, RoHS compliant DFN8 package. It measures 2.1mm×1.6mm. The
leads are spaced at a pitch of 0.5mm and are finished with lead-free Ni Pd. The small package
makes it ideal for use in portable electronics such as cell phones, digital still cameras, and PDAs.
Applications





Features
EMI Filtering and ESD Protection for 
Data Lines
Wireless Phones

Handheld Products
Notebook Computers

LCD Displays


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Pin Configurations
EMI/RFI Filter with Integrated TVS for
ESD Protection
ESD Protection to IEC 61000-4-2 (ESD)
Level 4, ±15kV (Air), ±8kV (Contact)
25dB Minimum Attenuation: 800MHz to
2.5GHz
Working Voltage: 5V
Resistor: 100Ω ±15%
Typical Capacitance: 10pF (VR = 2.5V)
Solid-State Technology
DFN8 Package: 2.1mm×1.6 mm
Moisture Sensitivity Level 1
Top View
1
8
Cd
Cd
Cd
Cd
Cd
Cd
Cd
Cd
2
7
3
6
4
5
M: Month Code
UM4401
DFN8 2.1×1.6
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UM4401
Ordering Information
Part Number
Packaging Type
Marking Code
UM4401
DFN8 2.1×1.6
4401
Shipping Qty
3000pcs/7Inch
Tape & Reel
Absolute Maximum Ratings (Note 1)
Symbol
Parameter
Value
Unit
TJ
Junction Temperature
125
°C
PR
Steady State Power per Resistor @ 25℃
328
mW
TOP
Operating Temperature Range
-40 to 85
°C
TSTG
Storage Temperature Range
-55 to 150
°C
260
°C
TL
Maximum Lead Temperature for Soldering
Note 1: Maximum ratings are those values beyond which device damage can occur. Maximum
ratings applied to the device are individual stress limit values (not normal operating conditions)
and are not valid simultaneously. If these limits are exceeded, device functional operation is not
implied, damage may occur and reliability may be affected.
Electrical Characteristics (TJ = 25°C unless otherwise noted)
Symbol
VRWM
VBR
IR
Parameter
Reverse Stand-Off
Voltage
Reverse Breakdown
Voltage
Reverse Leakage
Current
Total Series
Resistance
Test Conditions
It = 1.0mA
6 .0
Typ
7.0
VRWM = 3.3V
IR=10mA
Each Line
Input to GND, Each Line
Cd
Total Capacitance
VR = 0V, f = 1MHz
Input to GND, Each Line
Cd
Total Capacitance
VR = 2.5V, f = 1MHz
Above this frequency,
Cut-Off Frequency
f3dB
appreciable attenuation
(Note 2)
occurs
Note 2: 50Ω source and 50Ω load termination.
RA
Min
Max
Unit
5.0
V
8.0
V
100
nA
85
100
115
Ω
16
20
24
pF
9
10
12
pF
150
MHz
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UM4401
Typical Operating Characteristics
Typical Insertion Loss S21
Analog Crosstalk Curve (S41)
-5
-30
-10
-35
-15
-40
S41(dB)
S21 (dB)
-20
-25
-30
-45
-50
-35
-40
-55
-45
-60
1E7
1E8
1E7
1E9
1E8
1E9
Frequency(Hz)
FREQUENCY (Hz)
Typical Resistance vs. Temperature
Capacitance vs. Reverse Voltage
104
1.0
103
0.9
101
Cj(Vr)/Cj(Vr=0)
Resistance(ohm)
102
100
99
98
0.8
0.7
0.6
f=1M
97
0.5
96
0.4
-40
-20
0
20
40
60
80
Temperature(Celsiur scale)
ESD Clamping (+8KV Contact)
0
1
2
3
4
5
Reverse Voltage - Vr(V)
ESD Clamping (-8KV Contact)
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UM4401
Applications Information
Device Connection
The UM4401 is comprised of four identical circuits each consisting of a low pass filter for
EMI/RFI suppression and dual TVS diodes for ESD protection. The device is in a 8-pin DFN
package. Electrical connection is made to the 8 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. Pin
connections are noted in Figure 1. All path lengths should be kept as short as possible to minimize
the effects of parasitic inductance in the board traces. Recommendations for the ground
connection are given below.
Ground Connection Recommendation
Parasitic inductance present in the board layout will affect the filtering performance of the device.
As frequency increases, the effect of the inductance becomes more dominant. This effect is given
by Equation 1.
Pin
1-4
Identification
Input Lines
5-8
Output Lines
Center Tab
Ground
Equation 1: The Impedance of an Inductor at Frequency XLF
XLF(L,f ) = 2×л×f ×L
Where:
L= Inductance (H)
f = Frequency (Hz)
Via connections to the ground plane form rectangular wire loops or ground loop inductance as
shown in Figure 2. Ground loop inductance can be reduced by using multiple vias to make the
connection to the ground plane. Bringing the ground plane closer to the signal layer (preferably
the next layer) also reduces ground loop inductance. Multiple vias in the device ground pad will
result in a lower inductive ground loop over two exterior vias. Vias with a diameter d are
separated by a distance y run between layers separated by a distance x. The inductance of the loop
path is given by Equation 2. Thus, decreasing distance x and y will reduce the loop inductance and
result in better high frequency filter characteristics.
Where:
d = Diameter of the wire (in)
x = Length of wire loop (in)
y = Breath of wire loop (in)
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UM4401
Package Information
UM4401: DFN8 2.1×1.6
A
Outline Drawing
Side View
A3
A1
Symbol
D
D2
L
E
E2
Pin1 ID
C0.2*45
e
b
Bottom View
D
E
D2
E2
A
A1
A3
b
L
e
DIMENSIONS
MILLIMETERS
Min
Typ
Max
2.05
2.10
2.175
1.55
1.60
1.675
1.60
1.70
1.80
0.30
0.40
0.50
0.545
0.575
0.605
0
0.02
0.05
0.13TYP
0.20
0.25
0.30
0.275
0.325
0.375
0.50TYP
Land Pattern
NOTES:
1. Compound dimension: 2.10×1.60;
2. Unit: mm;
3.General tolerance ±0.05mm unless otherwise
specified;
4. The layout is just for reference.
Tape and Reel Orientation
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UM4401
IMPORTANT NOTICE
The information in this document has been carefully reviewed and is believed to be
accurate. Nonetheless, this document is subject to change without notice. Union assumes
no responsibility for any inaccuracies that may be contained in this document, and makes
no commitment to update or to keep current the contained information, or to notify a
person or organization of any update. Union reserves the right to make changes, at any
time, in order to improve reliability, function or design and to attempt to supply the best
product possible.
Union Semiconductor, Inc
Add: Unit 606, No.570 Shengxia Road, Shanghai 201210
Tel: 021-51093966
Fax: 021-51026018
Website: www.union-ic.com
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