Rev. 2.1 January 2011 www.aosmd.com Page 1 of 11
AOZ8904
Ultra-Low Capacitance TVS Diode Array
General Description
The AOZ8904 is a transient voltage suppressor array
designed to protect high speed data lines from Electro
Static Discharge (ESD) and lightning.
This device incorporates eight surge rated, low
capacitance steering diodes and a Transient Voltage
Suppressor (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. They may be used to meet the ESD immunity
requirements of IEC 61000-4-2, Level 4 (±15kV air,
±8kV contact discharge).
The AOZ8904 comes in a Halogen Free and RoHS
compliant SOT-23 and SC-70 packages. It is rated over a
-40°C to +85°C ambient temperature range.
Features
•ESD protection for high-speed data lines:
– Exceeds: IEC 61000-4-2 (ESD) ±24kV (air),
±24kV (contact)
– IEC 61000-4-5 (Lightning) 4A (8/20µs)
– Human Body Model (HBM) ±24kV
•Small package saves board space
•Low insertion loss
•Protects four I/O lines
•Low clamping voltage
•Low operating voltage: 5.0V
Applications
•USB 2.0 Power and Data Line Protection
•Video Graphics Cards
•Monitors and Flat Panel Displays
•Digital Video Interface (DVI)
Typical Application
Figure 1. 2 USB High Speed Ports
+5V
RT
VBUS
AOZ8904
USB Host
Controller Downstream
Ports
VBUS
D+
D-
GND
RT
+5V
RT
VBUS
D+
D-
GND
RT
AOZ8904
Rev. 2.1 January 2011 www.aosmd.com Page 2 of 11
Ordering Information
AOS Green Products used reduced levels of Halogens, and are also RoHS compliant.
Please visit www.aosmd.com/web/quality/rohs_compliant.jsp for additional information.
Pin Configuration
Absolute Maximum Ratings
Exceeding the Absolute Maximum ratings may damage the device.
Notes:
1. IEC 61000-4-2 discharge with CDischarge = 150pF, RDischarge = 330Ω.
2. Human Body Discharge per MIL-STD-883, Method 3015 CDischarge = 100pF, RDischarge = 1.5kΩ.
Part Number Ambient Temperature Range Package Environmental
AOZ8904CIL -40°C to +85°C SOT-23-6 RoHS Compliant
Green Product
AOZ8904HIL SC-70-6
1
2
3
6
5
4
CH1
VN
CH2
CH4
VP
CH3
SOT-23-6 / SC-70-6
(Top View)
Parameter Rating
VP – VN 6V
Peak Pulse Current (IPP), tP = 8/20µs 4A
Peak Power Dissipation (8 x 20µs@ 25°C) 50W
Storage Temperature (TS) -65°C to +150°C
ESD Rating per IEC61000-4-2, contact(1) ±24kV
ESD Rating per IEC61000-4-2, air(2) ±24kV
ESD Rating per Human Body Model(2) ±24kV
Junction Temperature (TJ) -40°C to +125°C
AOZ8904
Rev. 2.1 January 2011 www.aosmd.com Page 3 of 11
Electrical Characteristics
TA = 25°C unless otherwise specified
Notes:
3. These specifications are guaranteed by design.
4. The working peak reverse voltage, VRWM, should be equal to or greater than the DC or continuous peak operating voltage level.
5. VBR is measured at the pulse test current IT.
6. Measurements performed with no external capacitor on VP (Pin 5 floating).
7. Measurements performed with VP biased to 3.3 Volts (Pin 5 @ 3.3V).
8. Measurements performed using a 100 nSec Transmission Line Pulse (TLP) system.
Symbol Parameter Conditions Min. Typ. Max. Units
VRWM Reverse Working Voltage Between pin 5 and 2(4) 5.5 V
VBR Reverse Breakdown Voltage IT = 1mA, between pins 5 and 2(5) 6.6 V
IRReverse Leakage Current VRWM = 5V, between pins 5 and 2 1 µA
VFDiode Forward Voltage If = 15mA 0.7 0.85 0.95 V
VCL Channel Clamp Voltage
Positive Transients
Negative Transient
IPP = 1A, tp = 100ns, any I/O pin to
Ground(3)(6)(8) 11.00
-2.00
V
V
Channel Clamp Voltage
Positive Transients
Negative Transient
IPP = 5A, tp = 100ns, any I/O pin to
Ground(3)(6)(8) 14.00
-3.50
V
V
Channel Clamp Voltage
Positive Transients
Negative Transient
IPP = 12A, tp = 100ns, any I/O pin to
Ground(3)(6)(8) 18.00
-5.00
V
V
CjJunction Capacitance VR = 0V, f = 1Mhz, any I/O pin to Ground(3)(7) 1.25 1.3 pF
ΔCjChannel Input Capacitance
Matching
VR = 0V, f = 1Mhz, between I/O pins(3)(7) 0.03 pF
AOZ8904
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Typical Performance Characteristics
I/O – I/O Insertion Loss (S21) vs. Frequency
(Vp = Float)
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
Frequency (MHz)
Insertion Loss (dB)
1 10 100 1000
10010 1000
Analog Crosstalk (I/O–I/O) vs. Frequency
20
0
-20
-40
-60
-80
Frequency (MHz)
Insertion Loss (dB)
Clamping Voltage vs. Peak Pulse Current
(tperiod = 100ns, tr = 1ns)
17
16
15
14
13
12
11
10
9
Peak Pulse Current, IPP (A)
Clamping Voltage, VCL (V)
024681012
Forward Voltage vs. Forward Current
(tperiod = 100nS, tr = 1ns)
7
6
5
4
3
2
1
0
Forward Current, IPP (A)
Forward Voltage (V)
024681012
I/O – Gnd Insertion Loss (S21) vs. Frequency
(Vp = 3.3V)
1
0
-1
-2
-3
-4
-5
-6
-7
-8
-9
-10
Frequency (MHz)
Insertion Loss (dB)
1 10 100 1000
AOZ8904
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Application Information
The AOZ8904 TVS is design to protect four data lines
from fast damaging transient over-voltage by clamping it
to a reference. When the transient on a protected data
line exceed the reference voltage the steering diode is
forward bias thus, conducting the harmful ESD transient
away from the sensitive circuitry under protection.
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
AOZ8904 devices should be located as close as possible
to the noise source. The placement of the AOZ8904
devices should be used 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 AOZ8904 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 AOZ8904 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 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. The AOZ8904 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.
Good circuit board layout is critical for the suppression
of ESD induced transients. The following guidelines are
recommended:
1. Place the TVS near the IO terminals or connectors to
restrict transient coupling.
2. Fill unused portions of the PCB with ground plane.
3. Minimize the path length between the TVS and the
protected line.
4. Minimize all conductive loops including power and
ground loops.
5. The ESD transient return path to ground should be
kept as short as possible.
6. Never run critical signals near board edges.
7. Use ground planes whenever possible.
8. Avoid running critical signal traces (clocks, resets,
etc.) near PCB edges.
9. Separate chassis ground traces from components
and signal traces by at least 4mm.
10. Keep the chassis ground trace length-to-width ratio
<5:1 to minimize inductance.
11. Protect all external connections with TVS diodes.
AOZ8904
Rev. 2.1 January 2011 www.aosmd.com Page 6 of 11
IEEE1394 Port Connection
AOZ8904
IEEE 1394
PHY
IEEE 1394
Connector
56Ω1μ
270p
56Ω
56Ω 56Ω
5.1kΩ
TPBIASx
TPAx+
TPAx-
TPBx+
TPBx-
GND
AOZ8904
Rev. 2.1 January 2011 www.aosmd.com Page 7 of 11
Package Dimensions, SOT-23-6L
E1
E
AA2
A1
e
e1
D
.010mm
0.80
0.95 0.63
2.40
b
L
c
Gauge Plane Seating Plane
0.25mm
θ1
Notes:
1. Package body sizes exclude mold flash and gate burrs. Mold flash at the non-lead sides should be less than 5 mils each.
2. Dimension “L” is measured in gauge plane.
3. Tolerance ±0.100mm (4 mil) unless otherwise specified.
4. Followed from JEDEC MO-178C & MO-193C.
6. Controlling dimension is millimeter. Converted inch dimensions are not necessarily exact.
Symbols
A
A1
A2
b
c
D
E
E1
e
e1
L
θ1
Dimensions in millimeters
Min.
0.90
0.00
0.80
0.30
0.08
2.70
2.50
1.50
0.30
0°
Nom.
—
—
1.10
0.40
0.13
2.90
2.80
1.60
0.95 BSC
1.90 BSC
—
—
Max.
1.25
0.15
1.20
0.50
0.20
3.10
3.10
1.70
0.60
8°
Symbols
A
A1
A2
b
c
D
E
E1
e
e1
L
θ1
Min.
0.035
0.00
0.031
0.012
0.003
0.106
0.098
0.059
0.012
0°
Nom.
—
—
0.043
0.016
0.005
0.114
0.110
0.063
0.037 BSC
0.075 BSC
—
—
Max.
0.049
0.006
0.047
0.020
0.008
0.122
0.122
0.067
0.024
8°
Dimensions in inches
UNIT: mm
RECOMMENDED LAND PATTERN
AOZ8904
Rev. 2.1 January 2011 www.aosmd.com Page 8 of 11
Tape and Reel Dimensions, SOT-23-5&6L
Tape
Reel
Leader/Trailer and Orientation
Trailer Tape
300mm min.
Components Tape
Orientation in Pocket
Leader Tape
500mm min.
K0
B0
P0 A0
P1
P2
D0 D1
E1
E2 E
Unit: mm
Unit: mm
J
R
Feeding Direction
Tape Size
8mm
Reel Size
ø177.8
M
ø177.8
Max.
N
55.0
Min.
W1
8.4
+1.50 / -0.0
Package
SOT23-5/6L
LP
A0
3.15
±0.10
B0
3.20
±0.10
K0
1.40
±0.10
D0
1.50
±0.05
D1
1.00
+0.10 / -0
E
8.00
±0.30
E1
1.75
±0.10
E2
3.50
±0.05
P0
4.00
±0.10
P1
4.00
±0.10
P2
2.00
±0.05
T
0.23
±0.03
H
13.0
+0.5 / -0.2
S
1.5
Min
K
10.1
Min.
R
12.7
J
4.0
±0.1
W1
MN
S
K
H
AOZ8904
Rev. 2.1 January 2011 www.aosmd.com Page 9 of 11
Package Dimensions, SC-70-6L
e1
D
E1
E
AA2
A1
bc
L
e
θ
0.15mm
0.65
0.35
1.95
0.65
.010mm
Gauge Plane
Notes:
1. All dimensions are in millimeters.
2. Dimensions are inclusive of plating
3. Package body sizes exclude mold flash and gate burrs. Mold flash at the non-lead sides should be less than 3 mils.
4. Die is facing up for mold and facing down for trim/form; i.e., reverse trim/form.
5. Dimension L is measured in gauge plane.
6. Controlling dimension is millimeter, converted inch dimensions are not necessarily exact.
Symbols
A
A1
A2
b
c
D
E
e
e1
E1
L
θ
Dimensions in millimeters
Min.
0.00
0.7
0.15
0.08
1.85
1.80
1.1
0.26
0°
Nom.
—
—
0.9
—
—
2.10
2.30
0.65 BSC
1.30 BSC
1.30
0.36
4°
Max.
1.10
0.10
1.00
0.30
0.22
2.15
2.40
1.4
0.46
8°
Symbols
A
A1
A2
b
c
D
E
e
e1
E1
L
θ
Dimensions in inches
Min.
0.00
0.028
0.006
0.003
0.073
0.071
0.043
0.010
0°
Nom.
—
—
0.035
—
—
0.083
0.091
0.026 BSC
0.051 BSC
0.051
0.014
4°
Max.
0.043
0.004
0.039
0.012
0.009
0.085
0.094
0.055
0.018
8°
UNIT: mm
RECOMMENDED LAND PATTERN
AOZ8904
Rev. 2.1 January 2011 www.aosmd.com Page 10 of 11
Tape and Reel Dimensions, SC-70-6L
Carrier Tape
Reel
Tape Size
8mm
Reel Size
ø180
M
ø180.00
±0.50
Package
SC-70, 6L
(8mm)
A0
2.40
±0.10
B0
2.40
±0.10
K0
1.19
±0.10
D0
1.00
Min.
D1
1.55
±0.05
E
8.00
±0.30
E1
1.75
±0.10
E2
3.50
±0.05
P0
4.00
±0.10
P1
4.00
±0.10
P2
2.00
±0.05
T
0.25
±0.05
N
ø60.50
K0
UNIT: mm
B0
G
M
W1
S
K
H
N
W
V
R
Trailer Tape
300mm min. or
75 empty pockets
Components Tape
Orientation in Pocket
Leader Tape
500mm min. or
125 empty pockets
A0
P1
P2
Feeding Direction
P0
E2
E1
E
D0
T
D1
W
9.00
±0.30
W1
11.40
±1.00
H
ø13.00
+0.50/-0.20
K
10.60
S
2.00
±0.50
G
ø9.00
R
5.00
V
18.00
Leader/Trailer and Orientation
AOZ8904
Rev. 2.1 January 2011 www.aosmd.com Page 11 of 11
Part Marking
AKOW
LT
Week & Year Code
Assembly Lot Code
Part Number Code
Underscore Denotes
Greeen Product
Otption & Assembly Location Code
AOZ8904CIL
(SOT-23)
AWL
AOZ8904HIL
(SC-70)
Assembly Lot & Location Code
Week & Year Code
Part Number Code
Underscore Denotes
Greeen Product
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.
This datasheet contains preliminary data; supplementary data may be published at a later date.
Alpha & Omega Semiconductor reserves the right to make changes at any time without notice.
LIFE SUPPORT POLICY
ALPHA & OMEGA SEMICONDUCTOR PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL
COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS.
