AOZ8844DT [AOS]
Ultra-Low Capacitance TVS Diode;
| 型号： | AOZ8844DT |
| 厂家： | 
ALPHA & OMEGA SEMICONDUCTORS |
| 描述： | Ultra-Low Capacitance TVS Diode 电视 |
| 文件： | 总8页 (文件大小：398K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AOZ8844
Ultra-Low Capacitance TVS Diode
General Description
Features
The AOZ8844 is a transient voltage suppressor array
designed to protect high speed data lines such as HDMI,
USB 3.0, MDDI, SATA, and Gigabit Ethernet from
damaging ESD events.
ESD protection for high-speed data lines:
– IEC 61000-4-2, level 4 (ESD) immunity test
– Air discharge: ±20 kV; contact discharge: ±15 kV
– IEC61000-4-4 (EFT) 40 A (5/50 nS)
– IEC61000-4-5 (Lightning) +5 A (8/20 µS)
– Human Body Model (HBM) ±24 kV
This device incorporates eight surge rated, low
capacitance steering diodes and a TVS in a single
package. During transient conditions, the steering diodes
direct the transient to either the positive side of the power
supply line or to ground.
Array of surge rated diodes with internal TVS diode
Small package saves board space
Protects four I/O lines
Low capacitance between I/O lines: 0.26 pF
Low clamping voltage
The AOZ8844 provides a typical line-to-line capacitance
of 0.26 pF and low insertion loss up to 6 GHz providing
greater signal integrity making it ideally suited for
HDMI 1.3 or USB 3.0 applications, such as Digital TVs,
DVD players, computing, set-top boxes and MDDI
applications in mobile computing devices.
Applications
HDMI, USB 3.0, MDDI, SATA ports
Monitors and flat panel displays
Set-top box
The AOZ8844 comes in a RoHS compliant and Halogen
Free 1.3 mm x 0.8 mm x 0.4 mm DFN-5 package and is
rated for -40 °C to +125 °C junction temperature range.
Video graphics cards
Digital Video Interface (DVI)
Notebook computers
Typical Applications
AOZ8844
AOZ8844
AOZ8802A
TX2+
TX2-
RX2+
RX2-
D+
D-
D+
D-
TX1+
TX1-
RX1+
RX1-
HDMI
Receiver
RX0+
RX0-
USB 3.0
Transceiver
USB 3.0
HDMI
Connector
Transmitter
SSRX+
SSRX-
SSRX+
SSRX-
TX0+
TX0-
SSTX+
SSTX-
SSTX+
SSTX-
CLK+
CLK-
CLK+
CLK-
Connector
Connector
AOZ8844
AOZ8844
AOZ8844
Figure 1. USB 3.0 Ports
Figure 2. HDMI Ports
Rev. 1.0 July 2013
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Page 1 of 8
AOZ8844
Ordering Information
Part Number
Ambient Temperature Range
-40 °C to +85 °C
Package
Environmental
Green Product
AOZ8844DT
1.3 mm x 0.8 mm x 0.4 mm DFN-5
AOS Green Products use reduced levels of Halogens, and are also RoHS compliant.
Please visit www.aosmd.com/media/AOSGreenPolicy.pdf for additional information.
Pin Configuration
1
2
CH1
VN
CH4
CH3
5
4
3
CH2
DFN-5
(Top View)
Absolute Maximum Ratings
Exceeding the Absolute Maximum ratings may damage the device.
Parameter
Rating
Storage Temperature (TS)
-65 °C to +150 °C
±15 kV
ESD Rating per IEC61000-4-2, contact(1)(3)
ESD Rating per IEC61000-4-2, air(1)(3)
ESD Rating per Human Body Model(2)(3)
±20 kV
±24 kV
Notes:
1. IEC 61000-4-2 discharge with CDischarge = 150pF, RDischarge = 330 Ω.
2. Human Body Discharge per MIL-STD-883, Method 3015 CDischarge = 100 pF, RDischarge = 1.5 kΩ.
Maximum Operating Ratings
Parameter
Rating
Junction Temperature (TJ)
-40 °C to +125 °C
Rev. 1.0 July 2013
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AOZ8844
Electrical Characteristics
T = 25°C unless otherwise specified.
A
Symbol
Parameter
Diagram
IPP
VCL
VRWM
IR
Maximum Reverse Peak Pulse Current
Clamping Voltage @ IPP (IEC61000-4-5 8/20 µs pulse)
Working Peak Reverse Voltage
I
I
F
Maximum Reverse Leakage Current
Breakdown Voltage
VBR
IT
V
V
V
CL BR RWM
V
I
V
R
T
F
Test Current
I
VF
Forward Voltage @ IF (IF = 15 mA)
Peak Power Dissipation (IEC61000-4-5 8/20 µs pulse)
Capacitance @ VR = 0 and f = 1 MHz
Ppk
CJ
I
PP
(3)
V
(V)
BR
V
Max.
C (pF)
CL
J
V
(V)
Min.
I = 100 A
I (µA) V (V)
Device
Marking
RWM
R
F
I
= 2 A
I
= 5 A
P (W)
PK
Device
Max.
Max.
Typ.
Typ. Max.
T
PP
PP
AOZ8844DT
A
5.0
6.0
1.0
0.85
3.5
6.5
32
0.5
0.6
Notes:
3. These specifications are guaranteed by design and characterization.
Rev. 1.0 July 2013
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AOZ8844
Typical Performance Characteristics
Clamping Voltage vs. Peak Pulse Current
Capacitance vs. Reverse Bias
(IEC61000-4-5 8/20µs pulse current)
8
1.2
1.0
0.8
0.6
0.4
0.2
0
7
6
5
4
3
2
2
2.5
3.0
3.5
4.0
4.5
5.0
0
1
2
3
4
5
Peak Pulse Current (A)
Reverse Bias (V)
IO-GND Insertion Loss (S21) vs. Frequency
IO-IO Insertion Loss (S21) vs. Frequency
0
-1
-2
-3
-4
-5
0
-1
-2
-3
-4
-5
1
10
100
1000
10000
1
10
100
1000
10000
Frequency (MHz)
Frequency (MHz)
Rev. 1.0 July 2013
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AOZ8844
PCB can be improved by minimizing the impedance with
relatively short and wide ground traces. The PCB layout
and IC package parasitic inductances can cause
significant overshoot to the TVS’s clamping voltage. The
inductance of the PCB can be reduced by using short
trace lengths and multiple layers with separate ground
and power planes. One effective method to minimize
loop problems is to incorporate a ground plane in the
PCB design.
High Speed PCB Layout Guidelines
Printed circuit board layout is the key to achieving the
highest level of surge immunity on power and data lines.
The location of the protection devices on the PCB is the
simplest and most important design rule to follow. The
AOZ8844DT devices should be located as close as
possible to the noise source. The AOZ8844DT device
should be placed on all data and power lines that enter or
exit the PCB at the I/O connector. In most systems, surge
pulses occur on data and power lines that enter the PCB
through the I/O connector. Placing the AOZ8844DT
devices as close as possible to the noise source ensures
that a surge voltage will be clamped before the pulse can
be coupled into adjacent PCB traces. In addition, the
PCB should use the shortest possible traces. A short
trace length equates to low impedance, which ensures
that the surge energy will be dissipated by the
AOZ8844DT device. Long signal traces will act as
antennas to receive energy from fields that are produced
by the ESD pulse. By keeping line lengths as short as
possible, the efficiency of the line to act as an antenna for
ESD related fields is reduced. Minimize interconnecting
line lengths by placing devices with the most interconnect
as close together as possible. The protection circuits
should shunt the surge voltage to either the reference or
chassis ground. Shunting the surge voltage directly to the
IC’s signal ground can cause ground bounce. The
clamping performance of TVS diodes on a single ground
The AOZ8844DT ultra-low capacitance TVS is designed
to protect four high speed data transmission lines from
transient over-voltages by clamping them to a fixed
reference. The low inductance and construction
minimizes voltage overshoot during high current surges.
When the voltage on the protected line exceeds the
reference voltage the internal steering diodes are forward
biased, conducting the transient current away from the
sensitive circuitry. The AOZ8844DT is designed for ease
of PCB layout by allowing the traces to run underneath
the device. The pinout of the AOZ8844DT is designed to
simply drop onto the IO lines of a High Definition
Multimedia Interface (HDMI) or USB 3.0 design without
having to divert the signal lines that may add more
parasitic inductance. Pins 1, 2, 4 and 5 are connected to
the internal TVS devices and pins 6, 7, 9 and 10 are no
connects. The no connects was done so the package can
be securely soldered onto the PCB surface.
Clock
Data0
Clock
Data0
SSRX+
SSRX–
SSRX+
SSRX–
Ground
Ground
Ground
Ground
Data1
Data2
Data1
Data2
SSTX+
SSTX–
SSTX+
SSTX–
Figure 3. Flow Through Layout for HDMI
Figure 4. Flow Through Layout for USB 3.0
.
Rev. 1.0 July 2013
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AOZ8844
Package Dimensions, DFN 1.3mm x 0.8mm x 0.4mm, 5L
D
e1
A1
A
E
A2
2
1
5xb
e
TOP VIEW
SIDE VIEW
BOTTOM VIEW
RECOMMENDED LAND PATTERN
0.45
Dimensions in Millimeters
Symbols Min. Nom. Max.
Dimensions in Inches
Symbols Min. Nom. Max.
0.18
A
A1
A2
b
D
E
0.37
0.00
0.40
—
(0.13)
0.18
1.30
0.80
0.43
0.05
A
A1
A2
b
D
E
0.015 0.016 0.017
0.000
—
0.002
(0.005)
0.13
1.20
0.70
0.23
1.40
0.90
0.005 0.007 0.009
0.047 0.051 0.055
0.028 0.031 0.035
0.018 BSC
1.05
0.40
0.50
Unit: mm
0.25
e
e1
L
0.45 BSC
0.50 BSC
0.25
e
e1
L
0.020 BSC
0.008 0.010 0.012
0.20
0.30
Notes:
1. Controlling dimensions are in millimeters. Converted inch dimensions are not necessarily exact.
2. Land pattern dimensions are only for reference.
Rev. 1.0 July 2013
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Page 6 of 8
AOZ8844
Tape and Reel Dimensions, DFN 1.3mm x 0.8mm x 0.4mm, 5L
Carrier Tape
P1
P2
T
D1
E1
E2
E
B0
P0
K0
D0
A0
Feeding Direction
UNIT: mm
Package
A0
B0
K0
D0
D1
E
E1
E2
P0
P1
P2
T
DFN 1.3x0.8 1.02
1.52
0.05
0.50
0.05
0.50
0.05
1.50
8.00
1.75
3.50
0.05
4.00
0.10
4.00
0.10
2.00
0.05
0.20
0.02
0.05
0.10 +0.3/-0.10 0.10
(8mm)
Reel
W1
S
G
N
K
M
V
R
H
W
UNIT: mm
Tape Size Reel Size
8mm ø178
M
ø178.0
1.0
N
ø60.0
1.0
W
9.0
0.5
W1
—
H
K
10.25
0.2
S
2.4
0.1
E
ø9.8
R
—
R
—
ø13.0
+0.5 / –0.2
Leader / Trailer & Orientation
Trailer Tape
Components Tape
Orientation in Pocket
Leader Tape
500mm Min. OR
125 Empty Pockets
300mm Min. OR
75 Empty Pockets
Rev. 1.0 July 2013
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Page 7 of 8
AOZ8844
Part Marking
AOZ8844DT
(1.3 x 0.8 DFN)
A A
Part Number Code
Month Code
LEGAL DISCLAIMER
Alpha and Omega Semiconductor makes no representations or warranties with respect to the accuracy or
completeness of the information provided herein and takes no liabilities for the consequences of use of such
information or any product described herein. Alpha and Omega Semiconductor reserves the right to make changes
to such information at any time without further notice. This document does not constitute the grant of any intellectual
property rights or representation of non-infringement of any third party’s intellectual property rights.
LIFE SUPPORT POLICY
ALPHA AND OMEGA SEMICONDUCTOR PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL
COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS.
As used herein:
1. Life support devices or systems are devices or
systems which, (a) are intended for surgical implant into
the body or (b) support or sustain life, and (c) whose
failure to perform when properly used in accordance
with instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of
the user.
2. A critical component in any component of a life
support, device, or system whose failure to perform can
be reasonably expected to cause the failure of the life
support device or system, or to affect its safety or
effectiveness.
Rev. 1.0 July 2013
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