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KA278RXXC-Series
2 A Output Low Dropout Voltage Regulators
Features
Description
KA278RXXC-Series (33 / 05 / 12)
• 3.3 V, 5 V, 12 V Output Low-Dropout Voltage Regulator
• TO-220 Full-Mold Package (4 Pin)
• Over-Current Protection, Thermal Shutdown
• Over-Voltage Protection, Short-Circuit Protection
• Output Disable Function
The KA278RXXC is a low-dropout voltage regulator suitable for various electronic equipment. It provides a constant voltage power source in a TO-220 4-lead full-mold
package. The dropout voltage is below 0.5 V in full-rated
current (2 A). This regulator has peak current protection,
thermal shutdown, and over-voltage protection.
KA278RA05C
• Nominal 5 V Output without Adjusting
TO-220F 4L
• Output Adjustable between 1.27 V and 32 V
• 2 A Output Low-Dropout Voltage Regulator
• TO-220 Full-Mold Package (4 Pin)
1
• Over-Current Protection, Thermal Shutdown
1. VIN 2. VO 3. GND 4. Vdis - KA278RXXC (33 / 05 / 12)
1.VIN 2. VO 3. GND 4. Vadj - KA278RA05C
• Over-Voltage Protection, Short-Circuit Protection
Ordering Information
Part Number
Operating
Temperature
Range
Top Mark
KA278R33CTU
278R33
KA278R05CTU
278R05
KA278R12CTU
-20 to 80°C
278R12
KA278RA05CTU
278RA05
KA278R12CYDTU
278R12
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
Package
TO-220F 4L
Packing Method
Rail
TO-220F 4L (Forming)
www.fairchildsemi.com
1
KA278RXXC-Series — 2 A Output Low Dropout Voltage Regulators
July 2013
Vin
Q1
1
2
Vin
Vo
OVERVOLTAGE
PROTECTION
THERMAL SHUTDOWN
THERMAL SHUTDOWN
-
BANDGAP REFERENCE
Q1
1
BANDGAP REFERENCE
+
4
+
Rin
SOA PROTECTION
SOA PROTECTION
HIGH / LOW
Vdis
OVERVOLTAGE
PROTECTION
+
R1
2 Vo
OUTPUT
ON / OFF
4
Vadj
R2
1.4V
SHORTCIRCUIT
PROTECTION
SHORTCIRCUIT
PROTECTION
Rref
3
3
GND
GND
Figure 1. KA278R33 / 05 / 12C
Figure 2. KA278RA05C
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the parts to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only. Values are at TA = 25°C unless otherwise noted.
Symbol
Parameter
VIN
Input Voltage
Vdis
Disable Voltage
IO
Output Current
Value
KA278RXXC
Unit
35
V
35
V
2.0
A
PD1
Power Dissipation 1
No Heat-Sink
1.5
W
PD2
Power Dissipation 2
With Heat-Sink
15
W
150
°C
Tj
Junction Temperature
Topr
Operating Temperature
Rθjc
Thermal Resistance, Junction-to Case(1)
Rθja
Thermal Resistance, Junction-to-Air
-20 to 80
°C
2.9
°C/W
48.51
°C/W
Note:
1. Junction-to-case thermal resistance test environments:
- Pneumatic heat sink fixture;
- Clamping pressure 60 psi through 12 mm diameter cylinder;
- Thermal grease applied between PKG and heat sink fixture.
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
www.fairchildsemi.com
2
KA278RXXC-Series — 2 A Output Low Dropout Voltage Regulators
Block Diagram
VIN = Note 3, IO = 1.0 A, TA = 25°C, unless otherwise specified.
Symbol
VO
Parameter
Output Voltage
Min.
Typ.
Max.
KA278R33C
Test Conditions
3.22
3.30
3.38
KA278R05C
4.88
5.00
5.12
11.70
12.00
12.30
0.1
2.0
%
0.5
2.5
%
KA278R12C
Rload
Rline
RR
Load Regulation
Line Regulation
5 mA < IO < 2 A
(4)
(2)
45
Ripple Rejection Ratio
55
V
dB
Vdrop
Dropout Voltage
VdisH
Disable Voltage High
KA278RXXC
Output Active
VdisL
Disable Voltage Low
KA278RXXC
Output Disabled
0.8
V
IdisH
Disable Bias Current High
KA278RXXC
Vdis = 2.7 V
20
μA
IdisL
Disable Bias Current Low
KA278RXXC
Vdis = 0.4 V
-0.4
mA
10
mA
1.30
V
Iq
Quiescent Current
Vref
Reference Voltage
IO = 2 A
Unit
0.5
2.0
V
IO = 0 A
KA278RA05C
1.24
V
1.27
Notes:
2. These parameters, although guaranteed, are not 100% tested in production.
3. KA278R33C: VIN = 5 V;
KA278R05C: VIN = 7 V;
KA278R12C: VIN = 15 V.
4. KA278R33C: VIN =4 V to 10 V;
KA278R05C: VIN = 6 V to 12 V;
KA278R12C: VIN = 13 V to 29 V.
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
www.fairchildsemi.com
3
KA278RXXC-Series — 2 A Output Low Dropout Voltage Regulators
Electrical Characteristics
100
Quiescent current Iq(mA)
4.50
3.75
RL=
3.00
8
Output voltage Vo(V)
5.25
2.25
RL=3.3Ω
1.50
80
60
40
20
RL= ∞
0.75
0
0
0
2
4
6
8
0
5
10
10
15
20
Input voltage Vin(V)
Input voltage Vin (V)
Figure 4. Quiescent Current vs. Input Voltage
5.25
3.36
4.50
3.34
Output voltage Vo(V)
Output voltage Vo(V)
Figure 3. Output Voltage vs. Input Voltage
3.75
3.00
2.25
1.50
0.75
3.32
3.30
3.28
3.26
3.24
0
0
0.5
1
1.5
2
2.5
3.22
-25
3
0
Disable voltage Vdis (V)
Figure 5. Output Voltage vs. Disable Voltage
125
0.70
0.65
8
Drop out voltage Vdrop [V]
Quiescent current Iq(mA)
100
Figure 6. Output Voltage vs. Temperature (Tj)
10
6
4
2
0
75
25
50
TEMPERATURE Tj(oC)
-25
0
25
50
75
0.55
0.50
100
125
2.0A
0.45
0.40
0.35
0.30
-25
0
25
50
75
100
125
Junction Temp Tj [℃]
Junction temperature Tj(oC)
Figure 8. Dropout Voltage vs. Junction Temperature
Figure 7. Quiescent Current vs. Temperature (Tj)
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
0.60
www.fairchildsemi.com
4
KA278RXXC-Series — 2 A Output Low Dropout Voltage Regulators
Typical Performance Characteristics (KA278R33C)
(Continued)
100
Relative output voltage(%)
Power dissipation PD(W)
20
15
10
5
0
-25
80
60
40
20
0
0
75
25
50
TEMPERATURE Tj(oC)
100
0
125
1.0
2.0
3.0
4.0
5.0
6.0
Output Current(A)
Figure 10. Over-Current Protection Characteristics
(Typical Value)
Figure 9. Power Dissipation vs. Temperature (Tj)
Output peak current Iop (A)
4.75
4.50
4.25
4.00
3.75
3.50
0
1
2
3
4
5
6
Input-output differential voltage Vin-Vo (V)
Figure 11. Output Peak Current vs. Input-Output
Differential Voltage
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
www.fairchildsemi.com
5
KA278RXXC-Series — 2 A Output Low Dropout Voltage Regulators
Typical Performance Characteristics
(KA278R05C)
120
6
Quiescent current Iq(mA)
100
5
RL=
8
Output voltage Vo(V)
7
4
RL=2.5Ω
3
2
80
60
40
20
RL= ∞
1
0
0
5
0
10
0
5
10
15
20
Input voltage Vin(V)
15
Input voltage Vin (V)
Figure 13. Quiescent Current vs. Input Voltage
7
5.06
6
5.04
Output voltage Vo(V)
Output voltage Vo(V)
Figure 12. Output Voltage vs. Input Voltage
5
4
3
2
1
5.02
5.00
4.98
4.96
4.94
0
0
0.5
1
1.5
2
2.5
4.92
-25
3
0
Disable voltage Vdis (V)
100
125
Figure 15. Output Voltage vs. Temperature (Tj)
0.70
8
0.65
Drop out voltage Vdrop [V]
Quiescent current Iq(mA)
Figure 14. Output Voltage vs. Disable Voltage
75
25
50
TEMPERATURE Tj(oC)
6
4
2
0
0.60
0.55
0.50
0.40
0.35
0.30
-25
-25
0
25
50
75
100
125
2.0A
0.45
0
25
50
75
100
125
Junction Temp Tj [℃]
Junction temperature Tj(oC)
Figure 17. Dropout Voltage vs. Junction Temperature
figure 16. Quiescent Current vs. Temperature (Tj)
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
www.fairchildsemi.com
6
KA278RXXC-Series — 2 A Output Low Dropout Voltage Regulators
Typical Performance Characteristics
(Continued)
Relative output voltage(%)
Power dissipation PD(W)
20
15
10
5
0
-25
80
60
40
20
0
0
75
25
50
TEMPERATURE Tj(oC)
100
0
125
1.0
2.0
3.0
4.0
5.0
6.0
Output Current(A)
Figure 19. Over-Current Protection Characteristics
(Typical Value)
Figure 18. Power Dissipation vs. Temperature (Tj)
Output peak current Iop (A)
4.75
4.50
4.25
4.00
3.75
3.50
0
1
2
3
4
5
6
Input-output differential voltage Vin-Vo (V)
Figure 20. Output Peak Current vs. Input-Output
Differential Voltage
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
www.fairchildsemi.com
7
KA278RXXC-Series — 2 A Output Low Dropout Voltage Regulators
Typical Performance Characteristics
120
15.0
100
RL=
Quiescent current Iq(mA)
12.5
8
Output voltage Vo(V)
(KA278R12C)
10.0
RL= 6Ω
7.5
5.0
80
60
40
20
RL= ∞
2.5
0
0
5
0
10
15
20
0
5
25
10
15
20
Input voltage Vin(V)
Input voltage Vin (V)
Figure 22. Quiescent Current vs. Input Voltage
15.0
Output voltage Vo(V)
Output voltage Vo(V)
Figure 21. Output Voltage vs. Input Voltage
12.5
10.0
7.5
5.0
12.04
12.02
12.00
11.98
11.96
2.5
11.94
0
0
0.5
1
1.5
2
2.5
11.92
-25
3
0
Disable voltage Vdis (V)
Figure 23. Output Voltage vs. Disable Voltage
125
0.70
0.65
8
Drop out voltage Vdrop [V]
Quiescent current Iq(mA)
100
Figure 24. Output Voltage vs. Temperature (Tj)
10
6
4
2
0
75
25
50
TEMPERATURE Tj(oC)
-25
0
25
50
75
100
0.55
0.50
125
2.0A
0.45
0.40
0.35
0.30
-25
0
25
50
75
100
125
Junction Temp Tj [℃]
Junction temperature Tj(oC)
Figure 26. Dropout Voltage vs. Junction Temperature
25. Quiescent Current vs. Temperature (Tj)
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
0.60
www.fairchildsemi.com
8
KA278RXXC-Series — 2 A Output Low Dropout Voltage Regulators
Typical Performance Characteristics
(Continued)
100
Relative output voltage(%)
Power dissipation PD(W)
20
15
10
5
0
-25
80
60
40
20
0
0
75
25
50
TEMPERATURE Tj(oC)
100
0
125
1.0
2.0
3.0
4.0
5.0
6.0
Output Current(A)
Figure 28. Over-Current Protection Characteristics
(Typical Value)
Figure 27. Power Dissipation vs. Temperature (Tj)
Output peak current Iop (A)
4.75
4.50
4.25
4.00
3.75
3.50
0
1
2
3
4
5
6
Input-output differential voltage Vin-Vo (V)
Figure 29. Output Peak Current vs. Input-Output
Differential Voltage
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
www.fairchildsemi.com
9
KA278RXXC-Series — 2 A Output Low Dropout Voltage Regulators
Typical Performance Characteristics
(KA278RA05C)
7
120
100
Quiescent current Iq(mA)
Output voltage Vo(V)
6
RL=
8
5
4
RL=2.5Ω
3
2
80
60
40
20
RL= ∞
1
0
0
5
0
10
0
5
10
15
20
Input voltage Vin(V)
15
Input voltage Vin (V)
Figure 31.Quiescent Current vs. Input Voltage
Figure 30. Output Voltage vs. Input Voltage
10
Quiescent current Iq(mA)
5.06
Output voltage Vo(V)
5.04
5.02
5.00
4.98
4.96
4.94
4.92
-25
8
6
4
2
0
0
75
25
50
TEMPERATURE Tj(oC)
100
125
-25
0
25
50
75
100
125
Junction temperature Tj(oC )
Figure 33. Quiescent Current vs. Temperature (Tj)
Figure 32. Output Voltage vs. Temperature (Tj)
*Fixed Mode (VO = 5 V)
20
Power dissipation PD(W)
0.70
Drop out voltage Vdrop [V]
0.65
0.60
0.55
0.50
2.0A
0.45
0.40
0.35
0.30
-25
0
25
50
75
100
125
10
5
0
-25
Junction Temp Tj [℃]
0
75
25
50
TEMPERATURE Tj(oC)
100
125
Figure 35. Power Dissipation vs. Temperature (Tj)
Figure 34. Dropout Voltage vs. Junction
Temperature
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
15
www.fairchildsemi.com
10
KA278RXXC-Series — 2 A Output Low Dropout Voltage Regulators
Typical Performance Characteristics
(Continued)
100
80
Output peak current Iop (A)
Relative output voltage(%)
4.75
60
40
20
4.50
4.25
4.00
3.75
3.50
0
0
1.0
2.0
3.0
4.0
5.0
6.0
1
2
3
4
5
6
Input-output differential voltage Vin-Vo (V)
Output Current(A)
Figure 37. Output Peak Current vs. Input-Output
Differential Voltage
Figure 36. Over-Current Protection Characteristics
(Typical Value)
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
0
www.fairchildsemi.com
11
KA278RXXC-Series — 2 A Output Low Dropout Voltage Regulators
Typical Performance Characteristics
KA278RXXC-Series — 2 A Output Low Dropout Voltage Regulators
Typical Application
KA278R33 / 05 / 12C
Vo
Vin
1
2
+
+
3
GND
4
Vdis
Disable Signal
Figure 38. Application Circuit
• CI is required if regulator is located at an appreciable distance from power supply filter.
• CO improves stability and transient response (CO > 47 μF).
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
www.fairchildsemi.com
12
KA278RXXC-Series — 2 A Output Low Dropout Voltage Regulators
Typical Application
(continued)
KA278RA05
Output
Input
Vo
1 Vin
2
KA278RA05
GND
Ci
Vadj
3
R3
4
Co
RL
R4
R1//R3
kΩ, ,RR
==
0.6
kΩ
) R11 == 1.8
1.8kΩ
0.6kΩ
22
R2//R4
Vo = 1.25
1.27 ( 1 +
Figure 39. Application Circuit (Adjustable Mode)
• CI is required if regulator is located at an appreciable distance from power supply filter.
• CO improves stability and transient response (CO > 47 μF).
25
20
Variation(%)
15
10
5
0
-5
-10
-50
-25
0
25
50
75
100
125
Junction temperature Tj(℃)
Figure 40. Internal Resistor (R1, R2) Variation vs. Temperature (Tj)
Output = 5V
Input
Vo 2
1 Vin
KA278RA05
Ci
GND
3
Vadj 4
Co
RL
Figure 41. Application Circuit (Fixed Mode)
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
www.fairchildsemi.com
13
KA278RXXC-Series — 2 A Output Low Dropout Voltage Regulators
Physical Dimensions
TO-220F 4L
10.20
9.80
7.00
3.00
2.60
3.40
3.00
5.00
3.50
3.30
6.70
6.30
1.00X 45°
(3.30 ) B
15.80
15.40
15.90
B
15.50
1.30 MAX (3X)
1.05 MIN (3X)
0.89
10.60
10.00
1
13.60
4
0.70
(4X)
0.50
1.70
B
1.30
1.25 MIN B
1.50 MAX
0.60
0.45
2.79
(4X)
2.29
NOTES:
A. EXCEPT WHERE NOTED CONFORMS TO
SC91A.
B DOES NOT COMPLY EIAJ STD. VALUE.
C. ALL DIMENSIONS ARE IN MILLIMETERS.
D. DIMENSIONS ARE EXCLUSIVE OF BURRS,
MOLD FLASH AND TIE BAR PROTRUSIONS.
E. PIN 2 CONNECTS TO DAP.
F. DRAWING FILE NAME: TO220C04REV1
4.70
4.30
Figure 42. TO220, MOLDED, 4-LEAD, FULL-PACK, STARIGHT LEAD (ACTIVE)
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the
warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/dwg/TO/TO220C04.pdf.
For current tape and reel specifications, visit Fairchild Semiconductor’s online packaging area:
http://www.fairchildsemi.com/packing_dwg/PKG-TO220C04.pdf.
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
www.fairchildsemi.com
14
TO-220F 4L (Forming)
10.20
9.80
3.50
3.30
3.00
2.60
3.40
3.00
7.00
5.00
6.70
6.30
15.80
15.40
15.90
B
15.50
(3.30 ) B
1.00X 45°
26.80
25.20
1.30 MAX (3X) 5.60
5.00
1.05 MIN (3X)
5.30
B
4.70
0.70
0.50
0.89
1
1.25 MIN B
1.50 MAX
B
1.70
B
1.30
4
2.79
2.29
3.48
B
2.88
0.60
0.45
NOTES:
A. EXCEPT WHERE NOTED CONFORMS TO
SC91A.
B DOES NOT COMPLY EIAJ STD. VALUE.
C. ALL DIMENSIONS ARE IN MILLIMETERS.
D. DIMENSIONS ARE EXCLUSIVE OF BURRS,
MOLD FLASH AND TIE BAR PROTRUSIONS.
E. PIN 2 CONNECTS TO DAP.
F. DRAWING FILE NAME: TO220B04REV1
4.70
4.30
Figure 43. TO220, MOLDED, 4-LEAD, FULL-PACK, YDTU FORMING (ACTIVE)
Package drawings are provided as a service to customers considering Fairchild components. Drawings may change in any manner
without notice. Please note the revision and/or date on the drawing and contact a Fairchild Semiconductor representative to verify or
obtain the most recent revision. Package specifications do not expand the terms of Fairchild’s worldwide terms and conditions, specifically the
warranty therein, which covers Fairchild products.
Always visit Fairchild Semiconductor’s online packaging area for the most recent package drawings:
http://www.fairchildsemi.com/dwg/TO/TO220B04.pdf.
For current tape and reel specifications, visit Fairchild Semiconductor’s online packaging area:
http://www.fairchildsemi.com/packing_dwg/PKG-TO220B04.pdf.
© 2004 Fairchild Semiconductor Corporation
KA278RXXC-Series Rev. 1.1.0
www.fairchildsemi.com
15
KA278RXXC-Series — 2 A Output Low Dropout Voltage Regulators
Physical Dimensions (continued)
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Making Small Speakers Sound Louder
and Better™
MegaBuck¥
MICROCOUPLER¥
MicroFET¥
MicroPak¥
MicroPak2¥
MillerDrive¥
MotionMax¥
mWSaver¥
OptoHiT¥
OPTOLOGIC®
OPTOPLANAR®
2Cool¥
AccuPower¥
AX-CAP®*
BitSiC¥
Build it Now¥
CorePLUS¥
CorePOWER¥
CROSSVOLT¥
CTL¥
Current Transfer Logic¥
DEUXPEED®
Dual Cool™
EcoSPARK®
EfficientMax¥
ESBC¥
®
Fairchild®
Fairchild Semiconductor®
FACT Quiet Series¥
FACT®
FAST®
FastvCore¥
FETBench¥
Sync-Lock™
®
PowerTrench®
PowerXS™
Programmable Active Droop¥
QFET®
QS¥
Quiet Series¥
RapidConfigure¥
¥
Saving our world, 1mW/W/kW at a time™
SignalWise¥
SmartMax¥
SMART START¥
Solutions for Your Success¥
SPM®
STEALTH¥
SuperFET®
SuperSOT¥-3
SuperSOT¥-6
SuperSOT¥-8
SupreMOS®
SyncFET¥
®*
TinyBoost¥
TinyBuck¥
TinyCalc¥
TinyLogic®
TINYOPTO¥
TinyPower¥
TinyPWM¥
TinyWire¥
TranSiC¥
TriFault Detect¥
TRUECURRENT®*
PSerDes¥
UHC®
Ultra FRFET¥
UniFET¥
VCX¥
VisualMax¥
VoltagePlus¥
XS™
* Trademarks of System General Corporation, used under license by Fairchild Semiconductor.
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FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE
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As used herein:
2. A critical component in any component of a life support, device, or
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
system whose failure to perform can be reasonably expected to
life, and (c) whose failure to perform when properly used in
cause the failure of the life support device or system, or to affect its
accordance with instructions for use provided in the labeling, can be
safety or effectiveness.
reasonably expected to result in a significant injury of the user.
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under Sales Support.
Counterfeiting of semiconductor parts is a growing problem in the industry. All manufacturers of semiconductor products are experiencing counterfeiting of their
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Fairchild will not provide any warranty coverage or other assistance for parts bought from Unauthorized Sources. Fairchild is committed to combat this global
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PRODUCT STATUS DEFINITIONS
Definition of Terms
Datasheet Identification
Product Status
Advance Information
Formative / In Design
Preliminary
First Production
No Identification Needed
Full Production
Obsolete
Not In Production
Definition
Datasheet contains the design specifications for product development. Specifications may change
in any manner without notice.
Datasheet contains preliminary data; supplementary data will be published at a later date. Fairchild
Semiconductor reserves the right to make changes at any time without notice to improve design.
Datasheet contains final specifications. Fairchild Semiconductor reserves the right to make
changes at any time without notice to improve the design.
Datasheet contains specifications on a product that is discontinued by Fairchild Semiconductor.
The datasheet is for reference information only.
Rev. I64
© Fairchild Semiconductor Corporation
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1
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