LM78LXX Series
April 14, 2011
3-Terminal Positive Regulators
General Description
The LM78LXX series of three terminal positive regulators is
available with several fixed output voltages making them use-
ful in a wide range of applications. When used as a zener
diode/resistor combination replacement, the LM78LXX usu-
ally results in an effective output impedance improvement of
two orders of magnitude, and lower quiescent current. These
regulators can provide local on card regulation, eliminating
the distribution problems associated with single point regula-
tion. The voltages available allow the LM78LXX to be used in
logic systems, instrumentation, HiFi, and other solid state
electronic equipment.
The LM78LXX is available in the plastic TO-92 (Z) package,
the plastic SO-8 (M) package and a chip sized package (8-
Bump micro SMD) using National's micro SMD package tech-
nology. With adequate heat sinking the regulator can deliver
100mA output current. Current limiting is included to limit the
peak output current to a safe value. Safe area protection for
the output transistors is provided to limit internal power dissi-
pation. If internal power dissipation becomes too high for the
heat sinking provided, the thermal shutdown circuit takes over
preventing the IC from overheating.
Features
■LM78L05 in micro SMD package
■Output voltage tolerances of ±5% over the temperature
range
■Output current of 100mA
■Internal thermal overload protection
■Output transistor safe area protection
■Internal short circuit current limit
■Available in plastic TO-92 and plastic SO-8 low profile
packages
■No external components
■Output voltages of 5.0V, 6.2V, 8.2V, 9.0V, 12V, 15V
■See AN-1112 for micro SMD considerations
Connection Diagrams
SO-8 Plastic (M)
(Narrow Body)
774402
Top View
8-Bump micro SMD
774424
Top View
(Bump Side Down)
(TO-92)
Plastic Package (Z)
774403
Bottom View
micro SMD Marking Orientation
774433
Top View
© 2011 National Semiconductor Corporation 7744 www.national.com
LM78LXX Series 3-Terminal Positive Regulators
Ordering Information
Package NSC Drawing Output Voltage Order Number Supplied As
micro SMD BPA08AAB 5V LM78L05IBPX Reel of 3000
Thin micro SMD TPA08AAA 5V LM78L05ITP Reel of 250
LM78L05ITPX Reel of 3000
9V LM78L09ITPX Reel of 3000
SOIC Narrow M08A
5V
LM78L05ACM Rail of 95
LM78L05ACMX Reel of 2500
LM78L05AIM Rail of 95
LM78L05AIMX Reel of 2500
12V LM78L12ACMX Reel of 2500
15V LM78L15ACMX Reel of 2500
TO-92 Z03A
5V LM78L05ACZ Box of 1800
6.2V LM78L62ACZ Box of 1800
9V LM78L09ACZ Box of 1800
12V LM78L12ACZ Box of 1800
15V LM78L15ACZ Box of 1800
www.national.com 2
LM78LXX Series
Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Power Dissipation (Note 5) Internally Limited
Input Voltage 35V
Storage Temperature −65°C to +150°C
ESD Susceptibility (Note 2) 1kV
Operating Junction Temperature
SO-8, TO-92 0°C to 125°C
SO-8 (5V Only) -40°C to 125°C
micro SMD −40°C to 85°C
Soldering Information
Infrared or Convection (20 sec.) 235°C
Wave Soldering (10 sec.) 260°C (lead time)
LM78LXX Electrical Characteristics Limits in standard typeface are for TJ = 25°C, Bold typeface applies
over the entire operating temperature range of the indicated package. Limits are guaranteed by production testing or
correlation techniques using standard Statistical Quality Control (SQC) methods. Unless otherwise specified: IO = 40mA, CI =
0.33μF, CO = 0.1μF.
LM78L05
Unless otherwise specified, VIN = 10V
Symbol Parameter Conditions Min Typ Max Units
VOOutput Voltage 4.8 5 5.2
V
7V ≤ VIN ≤ 20V
1mA ≤ IO ≤ 40mA
(Note 3)
4.75 5.25
1mA ≤ IO ≤ 70mA
(Note 3)4.75 5.25
ΔVOLine Regulation 7V ≤ VIN ≤ 20V 18 75
mV
8V ≤ VIN ≤ 20V 10 54
ΔVOLoad Regulation 1mA ≤ IO ≤ 100mA 20 60
1mA ≤ IO ≤ 40mA 5 30
IQQuiescent Current 3 5
mA
ΔIQQuiescent Current Change 8V ≤ VIN ≤ 20V 1.0
1mA ≤ IO ≤ 40mA 0.1
VnOutput Noise Voltage f = 10 Hz to 100 kHz (Note
4) 40 μV
Ripple Rejection f = 120 Hz
8V ≤ VIN ≤ 16V 47 62 dB
IPK Peak Output Current 140 mA
Average Output Voltage Tempco IO = 5mA −0.65 mV/°C
VIN (Min) Minimum Value of Input Voltage
Required to Maintain Line Regulation
6.7 7 V
θJA Thermal Resistance
(8-Bump micro SMD)
230.9 °C/W
3 www.national.com
LM78LXX Series
LM78L62AC
Unless otherwise specified, VIN = 12V
Symbol Parameter Conditions Min Typ Max Units
VOOutput Voltage 5.95 6.2 6.45
V
8.5V ≤ VIN ≤ 20V
1mA ≤ IO ≤ 40mA
(Note 3)
5.9 6.5
1mA ≤ IO ≤ 70mA
(Note 3)5.9 6.5
ΔVOLine Regulation 8.5V ≤ VIN ≤ 20V 65 175
mV
9V ≤ VIN ≤ 20V 55 125
ΔVOLoad Regulation 1mA ≤ IO ≤ 100mA 13 80
1mA ≤ IO ≤ 40mA 6 40
IQQuiescent Current 2 5.5
mA
ΔIQQuiescent Current Change 8V ≤ VIN ≤ 20V 1.5
1mA ≤ IO ≤ 40mA 0.1
VnOutput Noise Voltage f = 10 Hz to 100 kHz
(Note 4)50 μV
Ripple Rejection f = 120 Hz
10V ≤ VIN ≤ 20V 40 46 dB
IPK Peak Output Current 140 mA
Average Output Voltage Tempco IO = 5mA −0.75 mV/°C
VIN (Min) Minimum Value of Input Voltage
Required to Maintain Line Regulation
7.9 V
LM78L82AC
Unless otherwise specified, VIN = 14V
Symbol Parameter Conditions Min Typ Max Units
VOOutput Voltage 7.87 8.2 8.53
V
11V ≤ VIN ≤ 23V
1mA ≤ IO ≤ 40mA
(Note 3)
7.8 8.6
1mA ≤ IO ≤ 70mA
(Note 3)7.8 8.6
ΔVOLine Regulation 11V ≤ VIN ≤ 23V 80 175
mV
12V ≤ VIN ≤ 23V 70 125
ΔVOLoad Regulation 1mA ≤ IO ≤ 100mA 15 80
1mA ≤ IO ≤ 40mA 8 40
IQQuiescent Current 2 5.5
mA
ΔIQQuiescent Current Change 12V ≤ VIN ≤ 23V 1.5
1mA ≤ IO ≤ 40mA 0.1
VnOutput Noise Voltage f = 10 Hz to 100 kHz
(Note 4)60 μV
Ripple Rejection f = 120 Hz
12V ≤ VIN ≤ 22V 39 45 dB
IPK Peak Output Current 140 mA
www.national.com 4
LM78LXX Series
Symbol Parameter Conditions Min Typ Max Units
Average Output Voltage Tempco IO = 5mA −0.8 mV/°C
VIN (Min) Minimum Value of Input Voltage
Required to Maintain Line Regulation 9.9 V
LM78L09AC
Unless otherwise specified, VIN = 15V
Symbol Parameter Conditions Min Typ Max Units
VOOutput Voltage 8.64 9.0 9.36
V
11.5V ≤ VIN ≤ 24V
1mA ≤ IO ≤ 40mA
(Note 3)
8.55 9.45
1mA ≤ IO ≤ 70mA
(Note 3)8.55 9.45
ΔVOLine Regulation 11.5V ≤ VIN ≤ 24V 100 200
mV
13V ≤ VIN ≤ 24V 90 150
ΔVOLoad Regulation 1mA ≤ IO ≤ 100mA 20 90
1mA ≤ IO ≤ 40mA 10 45
IQQuiescent Current 2 5.5
mA
ΔIQQuiescent Current Change 11.5V ≤ VIN ≤ 24V 1.5
1mA ≤ IO ≤ 40mA 0.1
VnOutput Noise Voltage 70 μV
Ripple Rejection f = 120 Hz
15V ≤ VIN ≤ 25V 38 44 dB
IPK Peak Output Current 140 mA
Average Output Voltage Tempco IO = 5mA −0.9 mV/°C
VIN (Min) Minimum Value of Input Voltage
Required to Maintain Line Regulation 10.7 V
LM78L12AC
Unless otherwise specified, VIN = 19V
Symbol Parameter Conditions Min Typ Max Units
VOOutput Voltage 11.5 12 12.5
V
14.5V ≤ VIN ≤ 27V
1mA ≤ IO ≤ 40mA
(Note 3)
11.4 12.6
1mA ≤ IO ≤ 70mA
(Note 3)11.4 12.6
ΔVOLine Regulation 14.5V ≤ VIN ≤ 27V 30 180
mV
16V ≤ VIN ≤ 27V 20 110
ΔVOLoad Regulation 1mA ≤ IO ≤ 100mA 30 100
1mA ≤ IO ≤ 40mA 10 50
IQQuiescent Current 3 5
mA
ΔIQQuiescent Current Change 16V ≤ VIN ≤ 27V 1
1mA ≤ IO ≤ 40mA 0.1
VnOutput Noise Voltage 80 μV
5 www.national.com
LM78LXX Series
Symbol Parameter Conditions Min Typ Max Units
Ripple Rejection f = 120 Hz
15V ≤ VIN ≤ 25 40 54 dB
IPK Peak Output Current 140 mA
Average Output Voltage Tempco IO = 5mA −1.0 mV/°C
VIN (Min) Minimum Value of Input Voltage
Required to Maintain Line Regulation 13.7 14.5 V
LM78L15AC
Unless otherwise specified, VIN = 23V
Symbol Parameter Conditions Min Typ Max Units
VOOutput Voltage 14.4 15.0 15.6
V
17.5V ≤ VIN ≤ 30V
1mA ≤ IO ≤ 40mA
(Note 3)
14.25 15.75
1mA ≤ IO ≤ 70mA
(Note 3)14.25 15.75
ΔVOLine Regulation 17.5V ≤ VIN ≤ 30V 37 250
mV
20V ≤ VIN ≤ 30V 25 140
ΔVOLoad Regulation 1mA ≤ IO ≤ 100mA 35 150
1mA ≤ IO ≤ 40mA 12 75
IQQuiescent Current 3 5
mA
ΔIQQuiescent Current Change 20V ≤ VIN ≤ 30V 1
1mA ≤ IO ≤ 40mA 0.1
VnOutput Noise Voltage 90 μV
Ripple Rejection f = 120 Hz
18.5V ≤ VIN ≤ 28.5V 37 51 dB
IPK Peak Output Current 140 mA
Average Output Voltage Tempco IO = 5mA −1.3 mV/°C
VIN (Min) Minimum Value of Input Voltage
Required to Maintain Line Regulation 16.7 17.5 V
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Electrical specifications do not apply when operating the device
outside of its stated operating conditions.
Note 2: Human body model, 1.5 kΩ in series with 100pF.
Note 3: Power dissipation ≤ 0.75W.
Note 4: Recommended minimum load capacitance of 0.01μF to limit high frequency noise.
Note 5: Typical thermal resistance values for the packages are:
Z Package: θJC = 60 °C/W, = θJA = 230 °C/W
M Package: θJA = 180 °C/W
micro SMD Package: θJA = 230.9°C/W
www.national.com 6
LM78LXX Series
Typical Performance Characteristics
Maximum Average Power Dissipation (Z Package)
774414
Peak Output Current
774416
Dropout Voltage
774417
Ripple Rejection
774418
Output Impedance
774419
Quiescent Current
774420
7 www.national.com
LM78LXX Series
Quiescent Current
774421
Equivalent Circuit
LM78LXX
774407
www.national.com 8
LM78LXX Series
Typical Applications
Fixed Output Regulator
774408
*Required if the regulator is located more than 3″ from the power supply filter.
**See (Note 4) in the electrical characteristics table.
Adjustable Output Regulator
774409
VOUT = 5V + (5V/R1 + IQ) R2
5V/R1 > 3 IQ, load regulation (Lr) ≈ [(R1 + R2)/R1] (Lr of LM78L05)
Current Regulator
774410
IOUT = (VOUT/R1) + IQ
>IQ = 1.5mA over line and load changes
5V, 500mA Regulator with Short Circuit Protection
774411
*Solid tantalum.
**Heat sink Q1.
***Optional: Improves ripple rejection and transient response.
Load Regulation: 0.6% 0 ≤ IL ≤ 250mA pulsed with tON = 50ms.
9 www.national.com
LM78LXX Series
±15V, 100mA Dual Power Supply
774412
*Solid tantalum.
Variable Output Regulator 0.5V-18V
774413
*Solid tantalum.
VOUT = VG + 5V, R1 = (−VIN/IQ LM78L05)
VOUT = 5V (R2/R4) for (R2 + R3) = (R4 + R5)
A 0.5V output will correspond to (R2/R4) = 0.1 (R3/R4) = 0.9
www.national.com 10
LM78LXX Series
Physical Dimensions inches (millimeters) unless otherwise noted
NOTES: UNLESS OTHERWISE SPECIFIED
1. EPOXY COATING
2. 63Sn/37Pb EUTECTIC BUMP
3. RECOMMEND NON-SOLDER MASK DEFINED LANDING PAD.
4. PIN A1 IS ESTABLISHED BY LOWER LEFT CORNER WITH RESPECT TO TEXT ORIENTATION. REMAINING PINS ARE NUMBERED COUNTERCLOCK-
WISE.
5. XXX IN DRAWING NUMBER REPRESENTS PACKAGE SIZE VARIATION WHERE X1 IS PACKAGE WIDTH, X2 IS PACKAGE LENGTH AND X3 IS PACKAGE
HEIGHT.
6. REFERENCE JEDEC REGISTRATION MO-211, VARIATION BC.
8-Bump micro SMD
NS Package Number BPA08AAB
X1 = 1.285mm X2 = 1.285mm X3 = 0.850mm
11 www.national.com
LM78LXX Series
8-Bump Thin micro SMD
NS Package Number TPA08AAA
X1 = 1.285mm X2 = 1.285mm X3 = 0.500mm
S.O. Package (M)
NS Package Number M08A
www.national.com 12
LM78LXX Series
Molded Offset TO-92 (Z)
NS Package Number Z03A
13 www.national.com
LM78LXX Series
Notes
LM78LXX Series 3-Terminal Positive Regulators
For more National Semiconductor product information and proven design tools, visit the following Web sites at:
www.national.com
Products Design Support
Amplifiers www.national.com/amplifiers WEBENCH® Tools www.national.com/webench
Audio www.national.com/audio App Notes www.national.com/appnotes
Clock and Timing www.national.com/timing Reference Designs www.national.com/refdesigns
Data Converters www.national.com/adc Samples www.national.com/samples
Interface www.national.com/interface Eval Boards www.national.com/evalboards
LVDS www.national.com/lvds Packaging www.national.com/packaging
Power Management www.national.com/power Green Compliance www.national.com/quality/green
Switching Regulators www.national.com/switchers Distributors www.national.com/contacts
LDOs www.national.com/ldo Quality and Reliability www.national.com/quality
LED Lighting www.national.com/led Feedback/Support www.national.com/feedback
Voltage References www.national.com/vref Design Made Easy www.national.com/easy
PowerWise® Solutions www.national.com/powerwise Applications & Markets www.national.com/solutions
Serial Digital Interface (SDI) www.national.com/sdi Mil/Aero www.national.com/milaero
Temperature Sensors www.national.com/tempsensors SolarMagic™ www.national.com/solarmagic
PLL/VCO www.national.com/wireless PowerWise® Design
University
www.national.com/training
THE CONTENTS OF THIS DOCUMENT ARE PROVIDED IN CONNECTION WITH NATIONAL SEMICONDUCTOR CORPORATION
(“NATIONAL”) PRODUCTS. NATIONAL MAKES NO REPRESENTATIONS OR WARRANTIES WITH RESPECT TO THE ACCURACY
OR COMPLETENESS OF THE CONTENTS OF THIS PUBLICATION AND RESERVES THE RIGHT TO MAKE CHANGES TO
SPECIFICATIONS AND PRODUCT DESCRIPTIONS AT ANY TIME WITHOUT NOTICE. NO LICENSE, WHETHER EXPRESS,
IMPLIED, ARISING BY ESTOPPEL OR OTHERWISE, TO ANY INTELLECTUAL PROPERTY RIGHTS IS GRANTED BY THIS
DOCUMENT.
TESTING AND OTHER QUALITY CONTROLS ARE USED TO THE EXTENT NATIONAL DEEMS NECESSARY TO SUPPORT
NATIONAL’S PRODUCT WARRANTY. EXCEPT WHERE MANDATED BY GOVERNMENT REQUIREMENTS, TESTING OF ALL
PARAMETERS OF EACH PRODUCT IS NOT NECESSARILY PERFORMED. NATIONAL ASSUMES NO LIABILITY FOR
APPLICATIONS ASSISTANCE OR BUYER PRODUCT DESIGN. BUYERS ARE RESPONSIBLE FOR THEIR PRODUCTS AND
APPLICATIONS USING NATIONAL COMPONENTS. PRIOR TO USING OR DISTRIBUTING ANY PRODUCTS THAT INCLUDE
NATIONAL COMPONENTS, BUYERS SHOULD PROVIDE ADEQUATE DESIGN, TESTING AND OPERATING SAFEGUARDS.
EXCEPT AS PROVIDED IN NATIONAL’S TERMS AND CONDITIONS OF SALE FOR SUCH PRODUCTS, NATIONAL ASSUMES NO
LIABILITY WHATSOEVER, AND NATIONAL DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY RELATING TO THE SALE
AND/OR USE OF NATIONAL PRODUCTS INCLUDING LIABILITY OR WARRANTIES RELATING TO FITNESS FOR A PARTICULAR
PURPOSE, MERCHANTABILITY, OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY
RIGHT.
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR
SYSTEMS WITHOUT THE EXPRESS PRIOR WRITTEN APPROVAL OF THE CHIEF EXECUTIVE OFFICER AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. As used herein:
Life support devices or systems are devices which (a) are intended for surgical implant into the body, or (b) 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 a significant injury to the user. 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 system or to affect its safety or effectiveness.
National Semiconductor and the National Semiconductor logo are registered trademarks of National Semiconductor Corporation. All other
brand or product names may be trademarks or registered trademarks of their respective holders.
Copyright© 2011 National Semiconductor Corporation
For the most current product information visit us at www.national.com
National Semiconductor
Americas Technical
Support Center
Email: support@nsc.com
Tel: 1-800-272-9959
National Semiconductor Europe
Technical Support Center
Email: europe.support@nsc.com
National Semiconductor Asia
Pacific Technical Support Center
Email: ap.support@nsc.com
National Semiconductor Japan
Technical Support Center
Email: jpn.feedback@nsc.com
www.national.com
