ZLDO1117
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1A LOW DROPOUT POSITIVE REGULATOR
1.2V, 1.5V, 1.8V, 2.5V, 3.3V, 5.0V AND ADJUSTABLE OUTPUTS
Description
ZLDO1117 is a low dropout positive adjustable or fixed-mode
regulator with 1A output current capability.
The ZLDO1117 has a 2% tolerance across the industrial temperature
range and is guaranteed to have lower than 1.2V dropout at full load
current making it ideal to provide well-regulated outputs of 1.2V to
5.0V with input supply voltages up to 18V.
The ZLDO1117 is ideally suited to provide well-regulated supplies for
low voltage IC applications such as high-speed bus termination and
low current 3.3V logic supply across the whole industrial temperature
range.
Features
1.2V Maximum Dropout at Full Load Current
2% Tolerance Over Temperature, Line and Load Variations
Fast Transient Response
Output Current Limiting
Built-in Thermal Shutdown
Good Noise Rejection
Suitable for use with MLCC Capacitors
Qualified to AEC-Q100 Grade 2 (see ‘Ordering Information’)
PPAP capable (Note 4)
-40 to +125°C Junction Temperature Range
Available in TO252 and SOT223 with “Green” Molding Compound
(No Br, Sb)
Lead-Free Finish; RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Pin Assignments
SOT223
TO252
1
2
3
Adj (GND)
Vout
Vin
Tab is Vout
(Top View)
Notes: 1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied.
2. See http://www.diodes.com for more information about Diodes In corpor ated’s definitions of Halogen- and Antimony-free, "Green" and Lead-free .
3. Halogen- and Antimony-free "Green” products are defined as tho se which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl)
and <1000ppm antimony compounds.
4. Automotive products are AEC-Q100 qualified and are PPAP capable. Automotive, AEC-Q100 and standard products are electrically and thermally
the same, except where specified.
Typical Applications Circuit
1A I/O – 1.8V Core Regulator
3.3V
4.7µF
MLCC
ZLDO1117-18 1.8V
4.7µF
MLCC
ZLDO1117
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Pin Descriptions
Pin
Name I/O Pin
Number Function
Adj (GND) I 1 A resistor divider from this pin to the VOUT pin and ground sets the output voltage ( Ground only for
Fixed-Mode).
VOUT O 2
The output of the regulator. A minimum of 4.7µF capacitor (0.05 ESR 0.5) must be connected
from this pin to ground to insure stability. For improved ac load response a larger output capacitor is
recommended.
VIN I 3
The input pin of regulator. Typically a large storage capacitor (0.05 ESR 0.5) is connected from
this pin to ground to ensure that the input voltage does not sag below the minimum dropout voltage
during the load transient response. This pin must always be 1.3V higher than VOUT in order for the
device to regulate properly.
Absolute Maximum Ratings (@TA = +25°C, unless otherwise specified.)
Symbol Parameter Rating Unit
VIN Input Supply Voltage (Relative to Ground) -0.03 to +18 V
TJ Junction Temperature +150 °C
Power Dissipation See SOA Curve
TST Storage Temperature -65 to +150 °C
Unless otherwise stated voltages specified are relative to the ANODE pin.
Safe Operation Area (SOA) Curve
ESD Susceptibility
Symbol Parameter Rating Unit
HBM Human Body Model 4 kV
MM Machine Model 400 V
Stresses greater than the 'Absolute Maximum Ratings' specified above, may cause permanent damage to the device. These are stress ratings only; functional
operation of the device at these or any other conditions exceeding those indicated in this specification is not implied. Device reliability may be affected by exposure to
absolute maximum rating conditions for extended periods of time.
Semiconductor devices are ESD sensitive and may be damaged by exposure to ESD events. Suitable ESD precautions should be taken when handling and
transporting these devices
0
0.2
0.4
0.6
0.8
1
1.2
0 5 10 15 20 25
VIN - VOUT (V)
ILOAD (A)
SOA
ZLDO1117
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Recommended Operating Conditions (@TA = +25°C, unless otherwise specified.)
Symbol Parameter Min Max Unit
VIN Input voltage 2.7 (Note 8) 18 V
IO Output current 0.01 1 A
TJ Operating Junction Temperature Range (Note 5) -40 +125 °C
Package Thermal Data
Thermal Resistance Package Rating Unit
Junction-to-Ambient, θJA SOT223 (Note 6)
TO252 (Note 7) 107
73 °C/W
Junction-to-Case, θJC SOT223 (Note 6)
TO252 (Note 7) 16
12 °C/W
Notes: 5. ZLDO1117 contains an internal thermal limiting circui t that is designed to protect the regulator in the event that the maximum junction temperature
exceeded. When activated, typically at 150°C, the regulator Output switches off and then back on as the die cools.
6. Test condition for SOT223: TA = +27°C, no air flow, device mounted on 2”X2” polyimide PCB, 2 oz copper, 5.6mmX5.6mm pad.
7. Test condition for TO252: TA = +27°C, no air flow, device mounted on 2”X2” polyimide PCB, 1 oz copper, 2cmX2cm pad.
8. Ensures correct operation without entering dropout. Device will continue to operate below this minimum input voltage under dropout conditions.
Electrical Characteristics (@TA = +25°C, unless otherwise specified.)
Parameter Conditions TA Min Typ Max Unit
Reference Voltage ZLDO1117-ADJ (VIN-VOUT) = 2V, IO = 10mA 25 1.238 1.250 1.263 V
VOUT+1.4V < VIN< 10V,
10mA < IO< 1A FT 1.225 1.275
Output Voltage
ZLDO1117-1.2 IO = 10mA, VIN = 3.2V 25 1.188 1.200 1.212 V
10mA< IO< 1A, 2.7V <VIN< 12V FT 1.176 1.224
ZLDO1117-1.5 IO = 10mA, VIN = 3.5V 25 1.485 1.500 1.515 V
0 < IO< 1A, 2.9V <VIN< 12V FT 1.470 1.530
ZLDO1117-1.8 IO = 10mA, VIN = 3.8V 25 1.782 1.800 1.818 V
0 < IO< 1A, 3.2V <VIN< 12V FT 1.764 1.836
ZLDO1117-2.5 IO = 10mA, VIN = 4.5V 25 2.475 2.500 2.525 V
0 < IO< 1A, 3.9V <VIN< 12V FT 2.450 2.550
ZLDO1117-3.3 IO = 10mA, VIN = 5.3V 25 3.267 3.300 3.333 V
0 < IO< 1A, 4.7V <VIN < 12V FT 3.235 3.365
ZLDO1117-5.0 IO = 10mA, VIN = 7V 25 4.95 5.000 5.05 V
0 < IO< 1A, 6.4V <VIN < 12V FT 4.900 5.100
Line Regulation
ZLDO1117-ADJ
ZLDO1117-1.2 IO = 10mA,
VOUT+1.5V<VIN<12V 25 0.1 %
FT 0.2
ZLDO1117-xx IO = 0mA,
VOUT+1.5V<VIN<12V 25 0.1 %
FT 0.2
Notes: 9. See thermal regulation specifications for changes in output voltage due to heating effects. Line and load regulation are measured at a constant
junction temperature by low duty cycle pulse testing. Load regulation is measured at the output lead = 1/18” from the package.
10. Line and load regulation are guaranteed up to the maximum power dissipation of 15W. Power dissipation is determined by the difference between input
and output differential and the output current. Guaranteed maximum power dissipation will not be available over the full input/output range.
ZLDO1117
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Electrical Characteristics (cont.) (@TA = +25°C, unless otherwise specified.)
Parameter Conditions TA Min Typ Max Unit
Load Regulation
ZLDO1117-ADJ VIN=3.3V,VADJ=0, 10mA<IO<1A,
(Notes 9, 10) 25 0.2 %
FT 0.4
ZLDO1117-1.2 VIN=2.7V, 10mA < IO < 1A,
(Notes 9, 10) 25 0.2 %
FT 0.4
ZLDO1117-1.5 VIN = 3V, 0 < IO< 1A,
(Notes 9, 10) 25 3 mV
FT 6
ZLDO1117-1.8 VIN = 3.3V, 0 < IO< 1A,
(Notes 9, 10) 25 4 mV
FT 8
ZLDO1117-2.5 VIN = 4V, 0 < IO< 1A,
(Notes 9, 10) 25 5 mV
FT 10
ZLDO1117-3.3 VIN = 4.8V, 0 < IO< 1A,
(Notes 9, 10) 25 6.6 mV
FT 13
ZLDO1117-5.0 VIN = 6.5V, 0 < IO< 1A,
(Notes 9, 10) 25 10 mV
FT 20
Dropout Voltage
(VIN-VOUT)
ZLDO1117-
ADJ/1.2/1.5/1.8/2.5/
3.3/5.0 IO = 1A, ΔVOUT = 1%VOUT 25 1.11 1.2 V
0 ~ 125 1.3
FT 1.35
Current Limit ZLDO1117-
ADJ/1.2/1.5/1.8/2.5/
3.3/5.0 (VIN-VOUT) = 5V 25 A
FT 1. 1
Minimum Load Current
(Note 8) ZLDO1117-ADJ
ZLDO1117-1.2 VIN = <18V FT 2 5 mA
Quiescent current ZLDO1117-xx VIN< 18V, IO = 0mA FT 4 10 mA
GND current ZLDO1117-ADJ
ZLDO1117-1.2 VIN = 7V FT 35 120 µA
Thermal Regulation 30ms pulse 25 0.1 %/W
Ripple Rejection f = 120Hz, COUT = 25µF Tantalum,
IOUT = 100mA, ZLDO1117-XXX VIN = VOUT+3V 25 60 80 dB
Temperature Stability IO = 10mA 0.5 %
Notes: 8. See thermal regulation specifications for changes in output voltage due to heating effects. Line and load regulation are measured at a constant
junctiontemperature by low duty cycle pulse testing. Load regulation is measured at the output lead = 1/18 ” from the package.
9. Line and load regulation are guaranteed up to the maximum power dissipation of 15W. Power dissipation is determined by the difference between input
and output differential and the output current. Guaranteed maximum power dissipation will not be available over the full input/output range.
ZLDO1117
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Typical Characteristics
Output Voltage Variation vs. Temperature Line Regulation vs. Temperature
Load Regulation vs. Temperature Drop-Out Voltage vs. Current
Drop-Out Voltage vs. Temperature
A
djust Pin Input Current
-0.5
-0.4
-0.3
-0.2
-0.1
0
0.1
0.2
0.3
0.4
0.5
-40 -25 -10 5 20 35 50 65 80 95 110 125
Temperature (°C)
Vout (%)
Adjustable version
I
LOAD
= 10mA
-0.01
0
0.01
0.02
0.03
0.04
0.05
0.06
-50-250 255075100125
Temperature (C)
Line Regulation (%)
V
OUT
+1.5V<V
IN
<12V, I
OUT
=10mA
0
0.05
0.1
0.15
0.2
0.25
-50 -25 0 25 50 75 100 125
Temperature (°C)
Load Regulation (%)
V
IN
=3.3V, 10mA<I
OUT
<1A
0.6
0.7
0.8
0.9
1
1.1
1.2
1.3
1.4
0 0.2 0.4 0.6 0.8 1
I
OUT
(A)
Dropout voltage (V)
T
J
= 25ºC
V
OUT
= 1% of V
OUT
Dropout vs Temperature
0.8
0.9
1
1.1
1.2
1.3
1.4
-50 -25 0 25 50 75 100 125
Temperature (°C)
Dropout (V)
I
OUT
=1A
V
OUT
= 1% of V
OUT
0
10
20
30
40
50
60
70
-50 -25 0 25 50 75 100 125
Temperature (°C)
I
ADJ
(µA)
ZLDO1117
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Typical Characteristics
Transient Load Regulation with 10µF Tantalum
Capacitor Transient Load Regulation with 4.7µF MLCC Capacito
r
Transient Line Regulation with 4.7µF MLCC Cap acito
r
Ripple Rejection
ILOAD = 100mA, VIN - VOUT = 3V
50
55
60
65
70
75
80
85
90
10 100 1,000 10,000 100,000
Frequency (Hz)
Ripple Rejection (dB)
4V
5V
0
10
10µs/div
ZLDO1117 2.5V
CIN = 1µF, COUT = 4.7µF MLCC
ILOAD = 100mA
100m
A
ZLDO1117-2.5V
CIN = 1µF, COUT = 10µFTANT
IPRELOAD = 100mA, Istep = 500mA
600m
A
0
10m
V
-10m
V
100m
A
ZLDO1117-2.5V
CIN = 1µF, COUT = 4.7µF MLCC
IPRELOAD = 100mA, ISTEP = 500mA
600m
A
0
10mV
-10mV
ZLDO1117
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Application Information
The ZLDO1117 family of quasi-LDO regulators is easy to use. They are protected against short circuit and thermal overloads. (see block
diagram).
Thermal protection circuitry will shut down the regulator should the junction temperature exceed +150°C at the sense point. The ZLDO1117 is
pin compatible with similar ‘1117 regulators and offers extended temperature range and improved regulation specifications.
Operation
The ZLDO1117 develops a 1.25V reference voltage between the output and the adjust terminal (see block diagram). By placing a resistor
between these two terminals, a constant current is caused to flow through R1 and down through R2. For fixed output variants Resistors R1 and
R2 are internal.
Stability
The ZLDO1117 requires an output capacitor as part of the device frequency compensation. As part of its improved performance over industry
standard 1117 the ZLDO1117 is suitable for use with MLCC (Multi Layer Ceramic Chip) capacitors. A minimum of 4.7µF ceramic X7R, 4.7µF
tantalum, or 47 µF of aluminum electrolytic is required. The ESR of the output capacitor should be less than 0.5. Surface mount tantalum
capacitors, which have very low ESR, are available from several manufacturers. When using MLCC capacitors avoid the use of Y5V dielectrics.
Load Regulation
For improved load regulation the ZLDO1117-ADJ should have the upper feedb ack resistor, R1, connected as close as possible to VOUT and the
lower resistor, R2, connected as close as possible to the load GND return. This helps reduce any parasitic resistance in series with the load.
Thermal Considerations
ZLDO1117 series regulators have internal thermal limiting circuitry designed to protect the device during overload conditions. For continuous
normal load conditions however, the maximum junction temperature rating of +125°C must not be exceeded.
It is important to give careful consideration to all sources of thermal resistance from junction to ambient. For the SOT223-3L and TO252-3L
packages, which are designed to be surface mounted, additional heat sources mounted near the device must also be considered. Heat sinking is
accomplished using the heat spreading capability of the PCB and its copper traces. The θJC (junction to tab)of the TO252-3L a nd S OT2 23-3L a re
+12°C/W and +16°C/W respectively.
Thermal resistances from tab to ambient can be as low as +30°C/W. The total thermal resistance from junction to ambient can be as low as
+42 to +46°C/W. This requires a reasonable sized PCB with at least one layer of copper to spread the heat across the board and couple it into
the surrounding air. Datasheet specifications using 2 oz copp er and a 5mmx5mm pad with T A = +27°C, no air flo w yielded θJA (junction to tab ) of
+73°C/W and +107°C/W for TO252-3L and SOT223-3L respectively.
The thermal resistance for each application will be affected by thermal interactions with other components on the board. Some experimentation
will be necessary to determine the actual value.
Ripple Rejection
When using the ZLDO1117 adjustable device the adjust terminal can be bypassed to improve ripple rejection. When the adjust terminal is
bypassed the required value of the output capacitor increases.
The device will require an output capacitor of 22µF tantalum or 150µF aluminum electrolytic when the adjust pin is bypassed. Normally, capacitor
values on the order of 100µF are used in the output of many regulators to ensure good load transient response with large load current changes.
Output capacitance can be increased without limit and larger values of output capacitance further improve stability and transient response.
The curves for Ripple Rejection were generated using an adjustable device with the adjust pin bypassed. These curves will hold true for all
values of output voltage. For proper b ypassing, and ripple rejection appro aching the values shown, the impedance of the adjust pin ca pacitor, at
the ripple frequency, should be < R1. R1 is normally in the range of 100 to 200. The size of the required adjust p in capacitor is a function of
the input ripple frequency. At 120Hz, with R1 = 100, the adjust pin capacitor should be >13µF. At 10kHz only 0.16µF is needed.
For fixed voltage devices, and adjustable devices without an adjust pin capacitor, the output ripple will increase as the ratio of the output voltage
to the reference voltage (VOUT/VREF). For example, with the output voltage equal to 5V, the output ripple will be increased by the ratio of 5V/1.25V.
It will increase by a factor of four. Ripple rejection will be degraded by 12dB from the value shown on the curve.
ZLDO1117
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Typical Application Circuits
Figure 1 Basic Adjustable Reg u lator with 5V Output
Using
+= 1R2R
125.1VOUT
then the output voltage becomes:
V0.5
110
330
125.1VOUT =
+=
Figure 2 Adjustable Regulator with IADJ Errors
2RI
1R2R
125.1V ADJOUT +
+=
Because IADJ typically is 55μA, its effect is negligible in most applications.
V02.53301055
110
330
125.1V 6
OUT =
++= ~ 0.4%
A. Output capacitor selection is critical for regulator stability. Larger Cout values benefit the regulator by improving transient response and loop
stability.
B. CADJ can be used to improve ripple rejection. If CADJ is used, a Cout that is larger in value than CADJ must be used.
C. Cin is recommended if ZLDO1117 is not located near the power supply filter.
D. An external diode is recommended to protect the regulator if the input instantaneously is shorted to GND.
E. This device is designed to be stable with tantalum and MLCC capacitors with an ESR less than 0.47.
ZLDO1117
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Other Application Circuits
Figure 3 ZLDO1117 with Extended Output Voltage
C2
100 F
10 F
ZLDO1117
IN OUT
ADJ
C1
R2
R1
121
365
VIN
TTL
R4
R3
1k 1k
1%
1%
T1
MMBT3904
VOUT
Figure 4 ZLDO1117 with Disable Function
ZLDO1117x50
IN OUT
ADJ
10 F
C1 C2
100 F
VOUT = -5V
AC
IN
Figure 5 ZLDO1117 as a Negative LDO
ZLDO1117
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Ordering Information
Part Number Output Voltage Packaging
(Note 11) Status Reel Quantity Tape width Reel size
ZLDO1117KTC Adjustable TO252 Active 2500 16 mm 13”
ZLDO1117GTA SOT223
Active 1000 12 mm 7”
ZLDO1117K12TC 1.2V TO252 Active 2500 16 mm 13”
ZLDO1117G12TA SOT223
Active 1000 12 mm 7”
ZLDO1117K15TC 1.5V TO252 Active 2500 16 mm 13”
ZLDO1117G15TA SOT223
Active 1000 12 mm 7”
ZLDO1117K18TC 1.8V TO252 Active 2500 16 mm 13”
ZLDO1117G18TA SOT223
Active 1000 12 mm 7”
ZLDO1117K25TC 2.5V TO252 Active 2500 16 mm 13”
ZLDO1117G25TA SOT223
Active 1000 12 mm 7”
ZLDO1117K33TC 3.3V TO252 Active 2500 16 mm 13”
ZLDO1117G33TA SOT223
Active 1000 12 mm 7”
ZLDO1117K50TC 5.0V TO252 Active 2500 16 mm 13”
ZLDO1117G50TA SOT223
Active 1000 12 mm 7”
ZLDO1117QKTC Adjustable TO252 Active 2500 16 mm 13”
ZLDO1117QGTA SOT223
Active 1000 12 mm 7”
ZLDO1117QK12TC 1.2V TO252 Active 2500 16 mm 13”
ZLDO1117QG12TA SOT223
Active 1000 12 mm 7”
ZLDO1117QK15TC 1.5V TO252 Active 2500 16 mm 13”
ZLDO1117QG15TA SOT223
Active 1000 12 mm 7”
ZLDO1117QK18TC 1.8V TO252 Active 2500 16 mm 13”
ZLDO1117QG18TA SOT223
Active 1000 12 mm 7”
ZLDO1117QK25TC 2.5V TO252 Active 2500 16 mm 13”
ZLDO1117QG25TA SOT223
Active 1000 12 mm 7”
ZLDO1117QK33TC 3.3V TO252 Active 2500 16 mm 13”
ZLDO1117QG33TA SOT223
Active 1000 12 mm 7”
ZLDO1117QK50TC 5.0V TO252 Active 2500 16 mm 13”
ZLDO1117QG50TA SOT223
Active 1000 12 mm 7”
Note: 11. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at
http://www.diodes.com/datasheets/ap02001.pdf.
ZLDO1117
Document numbe
r
Marking I
n
TO252
SOT223
r
: DS32018 Rev. 6
n
formatio
n
- 2
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DO1117
2
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ZLDO1117
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Package Outline Dimensions (All dimensions in mm.)
SOT223
TO252
SOT223
Dim Min Max Typ
A 1.55 1.65 1.60
A1 0.010 0.15 0.05
b1 2.90 3.10 3.00
b2 0.60 0.80 0.70
C 0.20 0.30 0.25
D 6.45 6.55 6.50
E 3.45 3.55 3.50
E1 6.90 7.10 7.00
e4.60
e12.30
L 0.85 1.05 0.95
Q 0.84 0.94 0.89
All Dimensions in mm
TO252
Dim Min Max Typ
A 2.19 2.39 2.29
A1 0.00 0.13 0.08
A2 0.97 1.17 1.07
b 0.64 0.88 0.783
b2 0.76 1.14 0.95
b3 5.21 5.46 5.33
c2 0.45 0.58 0.531
D 6.00 6.20 6.10
D1 5.21
e 2.286
E 6.45 6.70 6.58
E1 4.32
H 9.40 10.41 9.91
L 1.40 1.78 1.59
L3 0.88 1.27 1.08
L4 0.64 1.02 0.83
a 0° 10°
All Dimensions in mm
A1
A
b3
E
2X b2
D
L4
Ac2
e
A1
L
L3
3X b a
H
A2 E1
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Suggested Pad Layout
SOT223
TO252
Dimensions Value (in mm)
X1 3.3
X2 1.2
Y1 1.6
Y2 1.6
C1 6.4
C2 2.3
Dimensions Value (in mm)
Z 11.6
X1 1.5
X2 7.0
Y1 2.5
Y2 7.0
C 6.9
E1 2.3
X2
C1
C2
X1
Y2
Y1
X2
CZ
X1
Y1
E1
Y2
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Diodes Incorporated does not warrant or accept any liability whatsoever in respect of any products purchased through unauthorized sales channel.
Should Customers purchase or use Diodes Incorporated p roducts for any unintended or una uthorized application, Customers shall indemnify and
hold Diodes Incorporated and its representatives harmless against all claims, damages, expenses, and attorney fees arising out of, directly or
indirectly, any claim of personal injury or death associated with such unintended or unauthorized application.
Products described herein may be covered by one or more United States, international or foreign p atents pending. Product names and markings
noted herein may also be covered by one or more United States, international or foreign trademarks.
LIFE SUPPORT
Diodes Incorporated products are specifically not authorized for use as critical components in life support devices or systems without the express
written approval of the Chief Executive Officer of Diodes Incorporated. As used herein:
A. Life support devices or systems are devices or systems which:
1. are intended to implant into the body, or
2. support or sustain life and whose failure to perform when properly used in accordance with instructions for use provided in the
labeling can be reasonably expected to result in significant injury to the user.
B. A critical component is any component in a life support device or system whose failure to perform can be reasonably expected to cause the
failure of the life support device or to affect its safety or effectiveness.
Customers represent that they have all necessary expertise in the safety and regulatory ramifications of their life support devices or systems, and
acknowledge and agree that they are solely responsible for all legal, regulatory and safety-related requirements concerning their pro ducts and an y
use of Diodes Incorporated products in such safety-critical, life support devices or systems, notwithstanding any devices- or systems-related
information or support that may be provided by Diodes Incorporated. Further, Customers must fully indemnify Diodes Incorporated and its
representatives against any damages arising out of the use of Diodes Incorporated products in such safety-critical, life support devices or systems.
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