Rev. 1.0 January 2014 www.aosmd.com Page 1 of 14
AOZ1331DI
Dual Channel Smart Load Switch
General Description
The AOZ1331DI is a dual channel load switch with
typical 20mΩ on-resistance in a small package. It contains
two n-channel MOSFETs for up to 5.5V input voltage
operation and 6A current each channel with 2.5V to 5V
bias supply. Each load switch is independently controlled
by a low voltage control signal through ON1/ON2 pin.
The AOZ1331DI integrates an internal 220Ω load
resistor in each channel for quick output discharge when
load switch is off. The optional external capacitor
connected CT1/CT2 for output slew rate control.
The AOZ1331DI is available in a 3mm x 2mm DFN-14L
package with bottom thermal pad and is rated over a
-40°C to +85°C ambient temperature range.
Features
0.8V to 5.5V input voltage range
6A continuous current per channel
Low RDS(ON) internal NFETs
– 20mΩ at VBIAS = 2.5V to 5V & VBIAS > VIN
Low quiescent current
– 80µA (both channels)
– 60µA (single channel)
Adjustable rise time
2.5V to 5V bias voltage
Integrated quick output discharge resistor
Thermally enhanced 3mm x 2mm DFN-14L package
Applications
Portable computers
Ultrabooks
Tablet PC
Set top boxes
LCD TVs
Telecom/Networking/Datacom
equipment
SSD
Consumer electronics
Typical Application
VIN2
VIN1 VOUT1
VOUT2
IN1
CL2
CL1
ON
OFF AOZ1331DI
ON
OFF
ON1
VBIAS
ON2
IN2
OUT1
CT1
GND
CT2
OUT2
CT1
CT2
CIN1
CIN1
AOZ1331DI
Rev. 1.0 January 2014 www.aosmd.com Page 2 of 14
Ordering Information
All AOS products are offered in packages with Pb-free plating and compliant to RoHS standards.
Please visit www.aosmd.com/media/AOSGreenPolicy.pdf for additional information.
Pin Configuration
Pin Description
Part Number Temperature Range Package Environmental
AOZ1331DI -40°C to +85°C 3mm x 2mm DFN-14L Green
Pin Number Pin Name Pin Function
1, 2 IN1 Switch 1 Input. Bypass capacitor is recommended to minimize input voltage dip.
Recommended voltage range of this pin is 0.8V to VBIAS to obtain optimal RON.
3 ON1 Enable Input of Switch 1. Switch 1 is on when ON1 is pulled high, and is off when ON1 is
pulled low. Do not leave floating.
4 VBIAS Bias Voltage. Power supply to this device. Recommended voltage range is 2.5V to 5.5V.
5 ON2 Enable Input of Switch 2. Switch 2 is on when ON2 is pulled high, and is off when ON2 is
pulled low. Do not leave floating.
6, 7 IN2 Switch 2 Input. Bypass capacitor is recommended to minimize input voltage dip.
Recommended voltage range of this pin is 0.8V to VBIAS to obtain optimal RON.
8, 9 OUT2 Switch 2 Output.
10 CT2 Slew rate control of switch 2.
11 GND Ground.
12 CT1 Slew rate control of switch 1.
13, 14 OUT1 Switch 1 Output.
EPAD Exposed Pad The exposed bottom pad must be connected to GND.
14
13
12
11
10
9
8
1
2
3
4
5
6
7
OUT1
OUT1
CT1
GND
CT2
OUT2
OUT2
IN1
IN1
ON1
VBIAS
ON2
IN2
IN2
3mm x 2mm DFN-14
(Top View)
EPAD
AOZ1331DI
Rev. 1.0 January 2014 www.aosmd.com Page 3 of 14
Functional Block Diagram
Typical Performance Characteristics
Timing Diagram
CT1
IN1
ON1
IN2
CT2
ON2
VBIAS
OUT1
OUT2
GND
Control
Logic
Charge Pump
Control
Logic
AOZ1331DI
Rev. 1.0 January 2014 www.aosmd.com Page 4 of 14
Electrical Characteristics
TA = 25°C, VBIAS = 5V, unless otherwise specified. Specifications in BOLD indicate a temperature range of -40°C to +85°C.
Note:
Greater on-resistance if VIN > VBIAS.
Symbol Parameter Conditions Min. Typ. Max. Units
VINX IN Supply Voltage 0.8 VBIAS V
VBIAS VBIAS Supply Voltage 2.5 5.5 V
ID1, 2 Maximum Continuous Current VINX = VONX = 5V 6 A
IPLS1, 2 Maximum Pulsed Switch Current VINX = VONX = 5V
Pulse < 300µs, 2% Duty Cycle
8A
Iq2 Quiescent Supply Current of VBIAS
(Two Channels)
IOUT1 = IOUT2 = 0V,
VIN1,2 = VON1,2 = 5V
80 120 µA
Iq1 Quiescent Supply Current of VBIAS
(Single Channel)
IOUT1 = IOUT2 = 0V,
VIN1,2 = VON1 = 5V, VON2 = 0V
60 µA
IOFF VBIAS Shutdown Supply Current VON1,2 = 0V, VOUT1,2 = 0V 1 2 µA
IINOFF
IN1, IN2 Shutdown Supply Current
(Single Channel)
VONX = 0V, VOUTX = 0V,
VINX = 5V
2.1 8
µA
VONX = 0V, VOUTX = 0V,
VINX = 3.3V
0.3 3
VONX = 0V, VOUTX = 0V,
VINX = 1.8V
0.07 2
VONX = 0V, VOUTX = 0V,
VINX = 0.8V
0.04 1
ION1, 2 ON1, 2 Leakage Current VON1,2 = 5V 1 µA
VONH1, 2 ON1, 2 High Level Voltage VINX = 0.8V to 5V 1.2 V
VONL1, 2 ON1, 2 Low Level Voltage VINX = 0.8V to 5V 0.5 V
Switching ON Resistance
RON Switch ON-State Resistance IOUTX = -200mA
VINX = 0.8V to 5V
20 30 mΩ
RPD Output Pull-Down Resistance IOUTX = 15mA
VINX = 5V, VONX = 0V
220 300 Ω
Absolute Maximum Ratings
Exceeding the Absolute Maximum ratings may damage the
device.
Recommend Operating Ratings
The device is not guaranteed to operate beyond the Maximum
Operating Ratings.
Parameter Rating
IN1, IN2, VBIAS, ON1, ON2 to GND -0.3V to 6V
OUT1, OUT2 to GND -0.3V to 6V
Junction Temperature (TJ) +150°C
Storage Temperature (TS) -65°C to +150°C
ESD Rating HBM/CDM 2kV/1kV
Parameter Rating
Supply Voltage (VIN)5.5V
Ambient Temperature (TA) -40°C to +85°C
Package Thermal Resistance
3x2 DFN-14 (JC)
3x2 DFN-14 (JA)
10°C/W
65°C/W
Rev. 1.0 January 2014 www.aosmd.com Page 5 of 14
AOZ1331DI
Switching Characteristics
Test conditions: TA = 25°C, CINX = 1µF, CTX = 1nF, CLX = 0.1µF, RLX = 10Ω (unless otherwise specified).
Symbol Parameter Min. Typ. Max. Units
VINX = 5V, VBIAS = VONX = 5V
tON Turn-ON Time 1475
µs
tD-ON Turn-ON Delay time 370
tRTurn-ON Rise Time 1875
tOFF Turn-OFF Time 5.8
tFTurn-OFF Fall Time 2.8
VINX = 0.8V, VBIAS = VONX = 5V
tON Turn-ON Time 560
µs
tD-ON Turn-ON Delay time 350
tRTurn-ON Rise Time 338
tOFF Turn-OFF Time 158
tFTurn-OFF Fall Time 20
VINX = 2.5V, VBIAS = VONX = 2.5V
tON Turn-ON Time 2050
µs
tD-ON Turn-ON Delay time 700
tRTurn-ON Rise Time 2150
tOFF Turn-OFF Time 6.5
tFTurn-OFF Fall Time 2
VINX = 0.8V, VBIAS = VONX = 2.5V
tON Turn-ON Time 1230
µs
tD-ON Turn-ON Delay time 650
tRTurn-ON Rise Time 730
tOFF Turn-OFF Time 135
tFTurn-OFF Fall Time 16
50% 50%
50% 50%
VON
VOUT
t
ON
t
D-ON
t
OFF
90%
10%
t
R
t
F
90%
10%
1%
Rev. 1.0 January 2014 www.aosmd.com Page 6 of 14
AOZ1331DI
Typical Characteristics
90
80
70
60
50
40
30
20
10
0
Quiescent Current vs. VBIAS (Single Channel)
(VIN=VBIAS, VON1=5V, VON2=0V)
RSDON vs. VIN
(VBIAS=5.5V, IOUT=-200mA)
Quiescent Current vs. VBIAS (Both Channels)
(VIN=VBIAS, VON1=5V, VON2=5V)
RDSON vs. VIN
(VBIAS=2.5V, IOUT=-200mA)
VOUT vs. VON
(TA=25ºC, VIN=2V)
80
70
60
50
40
30
20
10
0
2.5 2.8 3.0 3.3 4.5 5.04.8 5.33.5 3.8 4.0 4.3 5.5
VBIAS (V)
IBIAS (μA)
25ºC
-40ºC
70ºC
80ºC
27
25
23
21
19
17
15
0.8 1.3 1.8 4.3 4.8 5.32.3 2.8 3.3 3.8 5.8
VIN (V)
RDSON (mΩ)
IBIAS (μA)
RPD (Ω)
29
27
25
23
21
19
17
15
0.8 1.1 2.0 2.31.4 1.7 2.6
VIN (V)
RDSON (mΩ)
2.5
2.0
1.5
1.0
0.5
0
0.5 0.7 1.10.9 1.3
VON (V)
VOUT (V)
VBIAS = 3.3V
VBIAS = 2.5V
VBIAS = 5.0V
VBIAS = 5.5V
25ºC
-40ºC
70ºC
80ºC
25ºC
-40ºC
70ºC
80ºC
2.5 2.8 3.0 3.3 4.5 5.04.8 5.33.5 3.8 4.0 4.3 5.5
VBIAS (V)
RPD vs. VIN
(VBIAS=5.5V)
228
226
224
222
220
218
216
214
212
210
0.8 1.3 1.8 4.3 4.8 5.32.3 2.8 3.3 3.8 5.8
VIN (V)
25ºC
-40ºC
70ºC
80ºC
25ºC
-40ºC
70ºC
80ºC
Rev. 1.0 January 2014 www.aosmd.com Page 7 of 14
AOZ1331DI
Typical Characteristics (Continued)
tON vs. VIN
(VBIAS=2.5V)
tD-ON vs. VIN
(VBIAS=5.5V)
tON vs. VIN
(VBIAS=5.5V)
tR vs. VIN
(VBIAS=2.5V)
tD-ON vs. VIN
(VBIAS=2.5V)
tR vs. VIN)
(VBIAS=5.5V)
3000
2500
2000
1500
1000
500
0
VIN (V)
tON (μs)
500
450
400
350
300
250
200
150
100
50
0
0.8 1.2 2.01.6 4.0 4.84.4 5.22.4 2.8 3.2 3.6 5.6
VIN (V)
tD-ON (μs)
2000
1800
1600
1400
1200
1000
800
600
400
200
0
0.8 1.2 2.01.6 4.44.0 4.8 5.22.4 2.8 3.2 3.6 5.6
VIN (V)
tON (μs)
3000
2500
2000
1500
1000
500
0
VIN (V)
tR (μs)
1200
1000
800
600
400
200
0
tD-ON (μs)
2500
2000
1500
1000
500
0
VIN (V)
tR (μs)
25ºC
-40ºC
70ºC
80ºC
0.8 1.21.0 2.0 2.42.21.4 1.81.6 2.6
25ºC
-40ºC
70ºC
80ºC
25ºC
-40ºC
70ºC
80ºC
25ºC
-40ºC
70ºC
80ºC
0.8 1.21.0 2.0 2.42.21.4 1.81.6 2.6
25ºC
-40ºC
70ºC
80ºC
VIN (V)
0.8 1.21.0 2.0 2.42.21.4 1.81.6 2.6
25ºC
-40ºC
70ºC
80ºC
0.8 1.2 2.01.6 4.44.0 4.8 5.22.4 2.8 3.2 3.6 5.6
Rev. 1.0 January 2014 www.aosmd.com Page 8 of 14
AOZ1331DI
Typical Characteristics (Continued)
tOFF vs. VIN
(VBIAS=2.5V)
tOFF vs. VIN
(VBIAS=5.5V)
tF vs. VIN
(VBIAS=2.5V)
tF vs. VIN
(VBIAS=5.5V)
160
140
120
100
80
60
40
20
0
tOFF (μs)
180
160
140
120
100
80
60
40
20
0
tOFF (μs)
25
20
15
10
5
0
tF (μs)
25
20
15
10
5
0
tF (μs)
VIN (V)
0.8 1.21.0 2.0 2.42.21.4 1.81.6 2.6
25ºC
-40ºC
70ºC
80ºC
VIN (V)
0.8 1.2 2.01.6 4.44.0 4.8 5.22.4 2.8 3.2 3.6 5.6
25ºC
-40ºC
70ºC
80ºC
VIN (V)
0.8 1.21.0 2.0 2.42.21.4 1.81.6 2.6
25ºC
-40ºC
70ºC
80ºC
VIN (V)
0.8 1.2 2.01.6 4.44.0 4.8 5.22.4 2.8 3.2 3.6 5.6
25ºC
-40ºC
70ºC
80ºC
Rev. 1.0 January 2014 www.aosmd.com Page 9 of 14
AOZ1331DI
Functional Characteristics
VOUT2
(2V/div)
VON1
(5V/div)
VOUT1
(2V/div)
VON2
(5V/div)
VON1
(5V/div)
VOUT1
(1V/div)
VON2
(5V/div)
VOUT2
(500mV/div)
VON1
(5V/div)
VOUT1
(500mV/div)
VON2
(5V/div)
VOUT2
(500mV/div)
VON1
(5V/div)
VOUT1
(500mV/div)
VON2
(5V/div)
VOUT2
(500mV/div)
VON1
(5V/div)
VOUT1
(500mV/div)
VON2
(5V/div)
VOUT2
(1V/div)
VON1
(5V/div)
VOUT1
(2V/div)
VON2
(5V/div)
VOUT2
(2V/div)
Turn-ON & Turn-ON Rise Times
(V
INX
=5V, V
BIAS
=5V, C
INX
=1μF, C
TX
=1nF, C
LX
=0.1μF, R
LX
=10Ω)
Turn-ON & Turn-ON Rise Times
(V
INX
=0.8V, V
BIAS
=5V, C
INX
=1μF, C
TX
=1nF, C
LX
=0.1μF, R
LX
=10Ω)
Turn-ON & Turn-ON Rise Times
(V
INX
=2.5V, V
BIAS
=2.5V, C
INX
=1μF, C
TX
=1nF, C
LX
=0.1μF, R
LX
=10Ω)
Turn-ON & Turn-ON Rise Times
(V
INX
=0.8V, V
BIAS
=2.5V, C
INX
=1μF, C
TX
=1nF, C
LX
=0.1μF, R
LX
=10Ω)
Turn-OFF & Turn-OFF Fall Times
(V
INX
=5V, V
BIAS
=5V, C
INX
=1μF, C
TX
=1nF, C
LX
=0.1μF, R
LX
=10Ω)
Turn-OFF & Turn-OFF Fall Times
(V
INX
=0.8V, V
BIAS
=5V, C
INX
=1μF, C
TX
=1nF, C
LX
=0.1μF, R
LX
=10Ω)
Rev. 1.0 January 2014 www.aosmd.com Page 10 of 14
AOZ1331DI
Functional Characteristics (Continued)
V
OUT2
(1V/div)
V
ON1
(5V/div)
V
OUT1
(1V/div)
V
ON2
(5V/div)
V
OUT2
(500mV/div)
V
ON1
(5V/div)
V
OUT1
(500mV/div)
V
ON2
(5V/div)
I
OUT
(2A/div)
V
ON
(5V/div)
V
OUT
(2V/div)
I
OUT
(2A/div)
V
ON
(5V/div)
V
OUT
(1V/div)
Turn-OFF & Turn-OFF Fall Times
(V
INX
=2.5V, V
BIAS
=2.5V, C
INX
=1μF, C
TX
=1nF, C
LX
=0.1μF, R
LX
=10Ω)
Turn-OFF & Turn-OFF Fall Times
(V
INX
=0.8V, V
BIAS
=2.5V, C
INX
=1μF, C
TX
=1nF, C
LX
=0.1μF, R
LX
=10Ω)
Turn-ON & Turn-OFF @ IOUT = 6A
(V
IN1
=5V, V
BIAS
=5V, C
IN1
=4.7μF, C
L1
=4.7μF)
Turn-ON & Turn-OFF @ IOUT = 6A
(V
IN1
=2.5V, V
BIAS
=5V, C
IN1
=4.7μF, C
L1
=4.7μF)
AOZ1331DI
Rev. 1.0 January 2014 www.aosmd.com Page 11 of 14
Detailed Description
ON/OFF Control
The AOZ1331DI is enabled when the ON pin is on active
high with 1.2V or above voltage. The device is disabled
when the ON pin voltage is 0.5V or lower. The EN input is
compatible with both TTL and CMOS logic.
VBIAS Voltage Range
For optimal on-resistance of load switch, make sure VIN ≤
VBIAS and VBIAS is within the voltage range from 2.5V to
5.5V. On-resistance of load switch will be higher if VIN >
VBIAS. Resistance curves of a typical sample device at
different VBIAS and different VIN are shown as below.
Adjustable Rise Time
The slew rate of each channel can be adjusted individu-
ally by external capacitors connected to the correspond-
ing CT and GND pins. Multiply the input voltage and the
slew rate to obtain the rise time. The table below shows
rise times, which are measured on a typical device at
VBIAS = 5V.
Applications Information
The basic AOZ1331DI application circuit is shown in the
first page. Component selection is explained below.
Input Capacitor Selection
A capacitor of 1μF or higher value is recommended to be
place close to the IN pins of AOZ1331DI. This capacitor
can reduce the voltage drop caused by the in-rush
current during the turn-on transient of the load switch. A
higher value capacitor can be used to further reduce the
voltage drop during high-current application.
Output Capacitor Selection
A capacitor of 0.1μF or higher value is recommended to
be place between the OUT pins and GND. The switching
times are affected by the capacitance. A larger capacitor
makes the initial turn-on transient smoother. This capaci-
tor must be large enough to supply a fast transient load in
order to prevent the output from dropping.
Thermal Considerations
T
o ensure proper operation, the maximum junction tem-
perature of the AOZ1331DI should not exceed 150°C.
Several factors attribute to the junction temperate rise:
load current, MOSFET on-resistance, junction-to-ambi-
ent thermal resistance, and ambient temperature. The
maximum load current can be determined by:
It is noted that the maximum continuous load current is
6A
.
Layout Guidelines
Good PCB is important for improving the thermal perfor-
mance of AOZ1331DI. Place the input and output bypass
capacitors close to the IN and OUT pins. The input and
output PCB traces should be as wide as possible for the
given PCB space. Use a ground plane to enhance the
power dissipation capability of the device.
CTX
(pF)
Rise Time (µs) 10%~90%, CLX=0.1µF, CINX=1µF, RLX=10Ω (Typical
values at 25°C, 25V X7R 10% Ceramic Cap)
VINX=5V 3.3V 1.8V 1.5V 1.2V 1.05V 0.8V
0 85 684945403734
220 431 297 172 147 122 106 89
470 888 583 332 269 218 189 161
1000 1700 1130 657 550 446 390 316
2200 3805 2534 1347 1152 966 867 701
4700 8053 5255 1997 2578 2101 1838 1483
10000 18330 12050 5545 5545 4155 4155 3329
ILOAD MAX
TJMAX
TC
–
JC RDSON
------------------------------------=
55
50
45
40
35
30
25
20
15
0.5 1.0 1.5 4.0 4.5 5.02.0 2.5 3.0 3.5 5.5
VIN (V)
RDSON (mΩ)
VBIAS = 3.3V
VBIAS = 2.5V
VBIAS = 3.6V
VBIAS = 4.2V
VBIAS = 5.0V
VBIAS = 5.5V
AOZ1331DI
Rev. 1.0 January 2014 www.aosmd.com Page 12 of 14
Package Dimensions, DFN3x2A_14L, EP1_S
D
TOP VIEW SIDE VIEW
BOTTOM VIEW
Notes:
1. Controlling dimensions are in millimeters. Converted inch dimensions are not necessarily exact.
2. Tolerance is ±0.05, unless otherwise specified.
3. Radius on all corners is 0.152 (max), unless otherwise specified.
4. Package wrapage is 0.012 (max).
5. No plastic flash allowed on the top or bottom lead surface.
6. Pad planarity is ±0.102.
7. Crack between plastic body and lead is not allowed.
E
Pin #1 Dot
By Marking
D1
E1
71
814
eb1(4x)
SIDE VIEW
A2
A1
RECOMMENDED LAND PATTERN
0.30(4x)
2.60
0.20(14x)
0.40
Unit: mm
Dimensions in millimeters Dimensions in inches
Symbols Min. Typ. Max.
A
A1
A2
E
E1
D
D1
L
L1
b
b1
b2
e
0.70
0.00
1.90
0.80
2.90
2.40
0.30
0.15
0.15
0.15
0.55
0.75
---
0.2 REF
2.00
0.90
3.00
2.50
0.35
0.20
0.20
0.20
0.60
0.40 BSC
0.80
0.05
2.10
1.00
3.10
2.60
0.40
0.25
0.25
0.25
0.65
Symbols Min. Typ. Max.
A
A1
A2
E
E1
D
D1
L
L1
b
b1
b2
e
0.028
0.000
0.075
0.031
0.114
0.094
0.012
0.006
0.006
0.006
0.022
0.030
---
0.008 REF
0.079
0.035
0.118
0.098
0.014
0.008
0.008
0.008
0.024
0.016 BSC
0.031
0.002
0.083
0.039
0.122
0.102
0.016
0.010
0.010
0.010
0.026
b2(4x)
L1(4x)
b(6x)
L(14x)
C45x0.20
A
0.50(14x)
0.20(2x)
0.90
2.30
Rev. 1.0 January 2014 www.aosmd.com Page 13 of 14
AOZ1331DI
Tape and Reel Dimensions, DFN3x2A_14L, EP1_S
Package
PIC DFN3x2
A0 B0 K0 E E1 E2D0 D1 P0 P1 P2 T
2.20
±0.10 ±0.10
1.03
+0.10
-0.0 +0.25
-0.0 +0.30
-0.1
1.50 1.00 8.00
±0.10
1.75
±0.05
3.50
±0.10
4.00
±0.10
4.00
±0.05
2.00
±0.02
0.23
R
MK
S
N
W1NM
60.00Ø180.00
±0.50 +1.50
-0.0
8.408mm
Tape Size RK
13.50
SH
1.50
MIN.
13.00
MIN.
3.00
±0.50
H
W1
Reel Size
Ø180
UNIT: MM
UNIT: MM
±0.50
B0
T
Feeding Direction
±0.20
±0.10
3.20
Carrier Tape
Reel
Leader/Trailer and Orientation
Trailer Tape
300mm min.
Components Tape
Orientation in Pocket
Leader Tape
500mm min.
D1
P1
P2
D0
A0
P0 E
E1
E2
A
Unit Per Reel:
3000pcs
K0
A-A
A
AOZ1331DI
Rev. 1.0 January 2014 www.aosmd.com Page 14 of 14
Package Marking
AOZ1331DI
(DFN3x2-14)
LTYW
Assembly Lot Code
Part Number Code
Option Code
Assembly Location Code
XXAY
Week & Year Code
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.
LIFE SUPPORT POLICY
ALPHA AND OMEGA SEMICONDUCTOR PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL
COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS.
LEGAL DISCLAIMER
Applications or uses as critical components in life support devices or systems are not authorized. AOS does not
assume any liability arising out of such applications or uses of its products. AOS reserves the right to make
changes to product specifications without notice. It is the responsibility of the customer to evaluate suitability of the
product for their intended application. Customer shall comply with applicable legal requirements, including all
applicable export control rules, regulations and limitations.
AOS' products are provided subject to AOS' terms and conditions of sale which are set forth at:
http://www.aosmd.com/terms_and_conditions_of_sale
