LM140L,LM340L
LM140L/LM340L Series 3-Terminal Positive Regulators
Literature Number: SNVS758A
LM140L/LM340L Series
3-Terminal Positive Regulators
General Description
The LM140L series of three terminal positive regulators is
available with several fixed output voltages making them
useful in a wide range of applications. The LM140LA is an
improved version of the LM78LXX series with a tighter out-
put voltage tolerance (specified over the full military tem-
perature range), higher ripple rejection, better regulation and
lower quiescent current. The LM140LA regulators have ±2%
V
OUT
specification, 0.04%/V line regulation, and 0.01%/mA
load regulation. When used as a zener diode/resistor com-
bination replacement, the LM140LA usually 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 distribu-
tion problems associated with single point regulation. The
voltages available allow the LM140LA to be used in logic
systems, instrumentation, Hi-Fi, and other solid state elec-
tronic equipment. Although designed primarily as fixed volt-
age regulators, these devices can be used with external
components to obtain adjustable voltages and currents.
The LM140LA/LM340LA are available in the low profile
metal three lead TO-39 (H) and the LM340LA are also
available in the plastic TO-92 (Z). With adequate heat sink-
ing the regulator can deliver 100 mA output current. Current
limiting is included to limit the peak output current to a safe
value. Safe area protection for the output transistor is pro-
vided to limit internal power dissipation. If internal power
dissipation becomes too high for the heat sinking provided,
the thermal shut-down circuit takes over, preventing the IC
from overheating.
For applications requiring other voltages, see LM117L Data
Sheet.
Features
nLine regulation of 0.04%/V
nLoad regulation of 0.01%/mA
nOutput voltage tolerances of ±2% at T
j
= 25˚C and ±4%
over the temperature range (LM140LA) ±3% over the
temperature range (LM340LA)
nOutput current of 100 mA
nInternal thermal overload protection
nOutput transistor safe area protection
nInternal short circuit current limit
nAvailable in metal TO-39 low profile package
(LM140LA/LM340LA) and plastic TO-92 (LM340LA)
Output Voltage Options
LM140LA-5.0 5V LM340LA-5.0 5V
LM140LA-12 12V LM340LA-12 12V
LM140LA-15 15V LM340LA-15 15V
Connection Diagrams
TO-39 Metal Can Package (H)
00778202
Bottom View
Order Number LM140LAH-5.0, LM140LAH-5.0/883, LM140LAH-12,
LM140LAH-12/883, LM140LAH-15, LM140LAH-15/883, LM340LAH-5.0, LM340LAH-12 or LM340LAH-15
See NS Package Number H03A
July 2005
LM140L/LM340L Series 3-Terminal Positive Regulators
© 2005 National Semiconductor Corporation DS007782 www.national.com
Connection Diagrams (Continued)
TO-92 Plastic Package (Z)
00778203
Bottom View
Order Number LM340LAZ-5.0, LM340LAZ-12 or LM340LAZ-15
See NS Package Number Z03A
LM140L/LM340L Series
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Absolute Maximum Ratings (Note 1)
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
(Note 5)
Input Voltage 35V
Internal Power Dissipation (Note 2) Internally Limited
Operating Temperature Range
LM140LA
LM340LA
−55˚C to +125˚C
0˚C to +70˚C
Maximum Junction Temperature +150˚C
Storage Temperature Range
Metal Can (H package) −65˚C to +150˚C
Molded TO-92 −55˚C to +150˚C
Lead Temperature (Soldering, 10 sec.)
Metal Can +300˚C
Plastic TO-92 +230˚C
Electrical Characteristics
Test conditions unless otherwise specified. T
A
= −55˚C to +125˚C (LM140LA), T
A
= 0˚C to +70˚C (LM340LA), I
O
= 40 mA, C
IN
= 0.33 µF, C
O
= 0.01 µF.
Output Voltage Option 5.0V 12V 15V
Input Voltage (unless otherwise noted) 10V 19V 23V Units
Symbol Parameter Conditions Min Typ Max Min Typ Max Min Typ Max
V
O
Output Voltage T
j
= 25˚C 4.9 5 5.1 11.75 12 12.25 14.7 15 15.3
Output Voltage LM140LA I
O
= 1 − 100 mA 4.8 5.2 11.5 12.5 14.4 15.6
Over Temp. (7.2–20) (14.5–27) (17.6–30) V
(Note 4) LM340LA I
O
= 1 − 100 mA or 4.85 5.15 11.65 12.35 14.55 15.45
I
O
=1−40mAand (7–20) (14.3–27) (17.5–30)
V
IN
=()V
∆V
O
Line Regulation T
j
= 25˚C I
O
=40mA 18 30 30 65 37 70
V
IN
= ( )V (7–25) (14.2–30) (17.3–30)
I
O
= 100 mA 18 30 30 65 37 70 mV
V
IN
= ( )V (7.5–25) (14.5–30) (17.5–30)
Load T
j
= 25˚C I
O
=1−40mA 5 20 10 40 12 50
Regulation I
O
= 1 − 100 mA 20 40 30 80 35 100
Long Term 12 24 30 mV
Stability 1000 hrs
I
O
Quiescent T
j
= 25˚C 3 4.5 3 4.5 3.1 4.5 mA
Current T
j
= 125˚C 4.2 4.2 4.2
∆I
Q
Quiescent T
j
= 25˚C ∆Load I
O
=1−40mA 0.1 0.1 0.1
Current ∆Line 0.5 0.5 0.5 mA
Change V
IN
= ( )V (7.5–25) (14.3–30) (17.5–30)
V
N
Output Noise T
j
= 25˚C (Note 3) 40 80 90 µV
Voltage f = 10 Hz–10 kHz
Ripple Rejection f = 120 Hz, V
IN
=()V 55 62 47 54 45 52 dB
(7.5–18) (14.5–25) (17.5–28.5)
Input Voltage
Required to T
j
= 25˚C, I
O
= 40 mA 7 14.2 17.3 V
Maintain Line
Regulation
Note 1: “Absolute Maximum Ratings” indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits.
Note 2: Thermal resistance of H-package is typically 26˚C/W θjC, 250˚C/W θjA still air, and 94˚C/W θjA 400 lf/min of air. For the Z-package is 60˚C/W θjC, 232˚C/W
θjA still air, and 88˚C/W θjA at 400 lf/min of air. The maximum junction temperature shall not exceed 125˚C on electrical parameters.
Note 3: It is recommended that a minimum load capacitor of 0.01 µF be used to limit the high frequency noise bandwidth.
Note 4: The temperature coefficient of VOUT is typically within 0.01% VO/˚C.
Note 5: A military RETS specification is available upon request. At the time of printing, the LM140LA-5.0, -12, and -15 RETS specifications complied with the Min
and Max limits in this table. The LM140LAH-5.0, LM140LAH-12, and LM140LAH-15 may also be procured as Standard Military Drawings.
LM140L/LM340L Series
www.national.com3
Typical Performance Characteristics
Maximum Average Power
Dissipation
Maximum Average
Power Dissipation
(Metal Can Package)
00778207 00778208
Maximum Average Power
Dissipation (Plastic Package) Peak Output Current
00778209 00778210
Dropout Voltage Output Impedance
00778211 00778212
LM140L/LM340L Series
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Typical Performance Characteristics (Continued)
Ripple Rejection Quiescent Current
00778213 00778214
Quiescent Current
00778215
Typical Applications
Fixed Output Regulator
00778205
*Required if the regulator is located far from the power supply filter.
**See note 3 in the electrical characteristics table.
LM140L/LM340L Series
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Typical Applications (Continued)
Adjustable Output Regulator
00778206
VOUT = 5V + (5V/R1 + IO)R2
5V/R1=3I
Oload regulation (L,) [(R1 + R2)/R1] (L, of LM140LA-5.0)
Equivalent Circuit
00778201
LM140L/LM340L Series
www.national.com 6
Physical Dimensions inches (millimeters) unless otherwise noted
TO-39 Metal Can Package (H)
Order Number LM140LAH-5.0, LM140LAH-5.0/883, LM140LAH-12, LM140LAH-12/883,
LM140LAH-15, LM140LAH-15/883, LM340LAH-5.0, LM340LAH-12 or LM340LAH-15
NS Package Number H03A
LM140L/LM340L Series
www.national.com7
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
TO-92 Plastic Package (Z)
Order Number LM340LAZ-5.0, LM340LAZ-12, or LM340LAZ-15
NS Package Number Z03A
National does not assume any responsibility for use of any circuitry described, no circuit patent licenses are implied and National reserves
the right at any time without notice to change said circuitry and specifications.
For the most current product information visit us at www.national.com.
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LM140L/LM340L Series 3-Terminal Positive Regulators
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