Page 1
LM340/LM78MXX Series
3-Terminal Positive Regulators
General Description
The LM140/LM340A/LM340/LM7800C monolithic 3-terminal
positive voltage regulators employ internal current-limiting,
thermal shutdown and safe-area compensation, making
them essentially indestructible. If adequate heat sinking is
provided, theycan deliver over 1.0A output current. They are
intended as fixed voltage regulators in a wide range of applications including local (on-card) regulation for elimination of
noise and distribution problems associated with single-point
regulation. In addition to use as fixed voltage regulators,
these devices can be used with external components to obtain adjustable output voltages and currents.
Considerable effort was expended to make the entire series
of regulators easy to use and minimize the number of external components. It is not necessary to bypass the output, although this does improve transient response. Input bypassing is needed only if the regulator is located far from the filter
capacitor of the power supply.
The 5V, 12V, and 15V regulator options are available in the
steel TO-3 power package. The LM340A/LM340/LM7800C
series is available in the TO-220 plastic power package, and
the LM340-5.0 is available in the SOT-223 package, as well
as the LM340-5.0 and LM340-12 in the surface-mount
TO-263 package.
Features
n Complete specifications at 1A load
n Output voltage tolerances of
±
2% at Tj= 25˚C and±4%
over the temperature range (LM340A)
n Line regulation of 0.01% of V
OUT
/V of ∆VINat 1A load
(LM340A)
n Load regulation of 0.3% of V
OUT
/A (LM340A)
n Internal thermal overload protection
n Internal short-circuit current limit
n Output transistor safe area protection
n P
+
Product Enhancement tested
Device
Output
Voltages
Packages
LM140 5, 12,
15
TO-3 (K)
LM340A/LM340 5, 12,
15
TO-3 (K), TO-220 (T),
SOT-223 (MP), TO-263 (S)
(5V and 12V only)
LM7800C 5, 8, 12,15TO-220 (T)
Typical Applications
Fixed Output Regulator
DS007781-1
*
Required if the regulator is located far from the power supply filter.
**
Although no output capacitor is needed for stability, it does help transient
response. (If needed, use 0.1 µF, ceramic disc).
Adjustable Output Regulator
DS007781-2
V
OUT
= 5V + (5V/R1 + IQ) R2 5V/R1>3IQ,
load regulation (L
r
) ≈ [(R1 + R2)/R1] (Lrof LM340-5).
Current Regulator
DS007781-3
∆IQ= 1.3 mA over line and load changes.
Comparison between SOT-223 and D-Pak (TO-252)
Packages
DS007781-38
Scale 1:1
February 2000
LM340/LM78MXX Series 3-Terminal Positive Regulators
© 2000 National Semiconductor Corporation DS007781 www.national.com
Page 2
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)
DC Input Voltage
All Devices except
LM7824/LM7824C 35V
LM7824/LM7824C 40V
Internal Power Dissipation (Note 2) Internally Limited
Maximum Junction Temperature 150˚C
Storage Temperature Range −65˚C to +150˚C
Lead Temperature (Soldering, 10 sec.)
TO-3 Package (K) 300˚C
TO-220 Package (T), TO-263
Package (S) 230˚C
ESD Susceptibility (Note 3) 2 kV
Operating Conditions (Note 1)
Temperature Range (T
A
) (Note 2)
LM140A, LM140 −55˚C to +125˚C
LM340A, LM340, LM7805C,
LM7812C, LM7815C, LM7808C 0˚C to +125˚C
LM340A
Electrical Characteristics
I
OUT
= 1A, −55˚C ≤ TJ≤+150˚C (LM140A), or 0˚C ≤ TJ≤+ 125˚C (LM340A) unless otherwise specified (Note 4)
Output Voltage 5V 12V 15V
Symbol Input Voltage (unless otherwise noted) 10V 19V 23V Units
Parameter Conditions Min Typ Max Min Typ Max Min Typ Max
V
O
Output Voltage TJ= 25˚C 4.9 5 5.1 11.75 12 12.25 14.7 15 15.3 V
P
D
≤ 15W, 5 mA ≤ IO≤ 1A 4.8 5.2 11.5 12.5 14.4 15.6 V
V
MIN
≤ VIN≤ V
MAX
(7.5 ≤ VIN≤ 20) (14.8 ≤ VIN≤ 27) (17.9 ≤ VIN≤ 30) V
∆V
O
Line Regulation IO= 500 mA 10 18 22 mV
∆V
IN
(7.5 ≤ VIN≤ 20) (14.8 ≤ VIN≤ 27) (17.9 ≤ VIN≤ 30) V
T
J
= 25˚C 3 10 4 18 4 22 mV
∆V
IN
(7.5 ≤ VIN≤ 20) (14.5 ≤ VIN≤ 27) (17.5 ≤ VIN≤ 30) V
T
J
= 25˚C 4 9 10 mV
Over Temperature 12 30 30 mV
∆V
IN
(8 ≤ VIN≤ 12) (16 ≤ VIN≤ 22) (20 ≤ VIN≤ 26) V
∆V
O
Load Regulation TJ= 25˚C 5 mA ≤ IO≤ 1.5A 10 25 12 32 12 35 mV
250 mA ≤ I
O
≤ 750 mA 15 19 21 mV
Over Temperature, 25 60 75 mV
5mA≤I
O
≤1A
I
Q
Quiescent Current TJ= 25˚C 6 6 6 mA
Over Temperature 6.5 6.5 6.5 mA
∆I
Q
Quiescent Current 5 mA ≤ IO≤ 1A 0.5 0.5 0.5 mA
Change T
J
= 25˚C, IO= 1A 0.8 0.8 0.8 mA
V
MIN
≤ VIN≤ V
MAX
(7.5 ≤ VIN≤ 20) (14.8 ≤ VIN≤ 27) (17.9 ≤ VIN≤ 30) V
I
O
= 500 mA 0.8 0.8 0.8 mA
V
MIN
≤ VIN≤ V
MAX
(8 ≤ VIN≤ 25) (15 ≤ VIN≤ 30) (17.9 ≤ VIN≤ 30) V
V
N
Output Noise Voltage TA= 25˚C, 10 Hz ≤ f ≤ 100 kHz 40 75 90 µV
Ripple Rejection TJ= 25˚C, f = 120 Hz, IO=1A 68 80 61 72 60 70 dB
or f = 120 Hz, I
O
= 500 mA, 68 61 60 dB
Over Temperature,
V
MIN
≤ VIN≤ V
MAX
(8 ≤ VIN≤ 18) (15 ≤ VIN≤ 25) (18.5 ≤ VIN≤ 28.5) V
R
O
Dropout Voltage TJ= 25˚C, IO= 1A 2.0 2.0 2.0 V
Output Resistance f = 1 kHz 8 18 19 mΩ
Short-Circuit Current T
J
= 25˚C 2.1 1.5 1.2 A
Peak Output Current T
J
= 25˚C 2.4 2.4 2.4 A
Average TC of V
O
Min, TJ= 0˚C, IO= 5 mA −0.6 −1.5 −1.8 mV/˚C
V
IN
Input Voltage TJ= 25˚C
Required to Maintain 7.5 14.5 17.5 V
Line Regulation
LM340/LM78MXX
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Page 3
LM140
Electrical Characteristics
(Note 4)
−55˚C ≤ TJ≤ +150˚C unless otherwise specified
Output Voltage 5V 12V 15V
Symbol Input Voltage (unless otherwise noted) 10V 19V 23V Units
Parameter Conditions Min Typ Max Min Typ Max Min Typ Max
V
O
Output Voltage TJ= 25˚C, 5 mA ≤ IO≤ 1A 4.8 5 5.2 11.5 12 12.5 14.4 15 15.6 V
P
D
≤ 15W, 5 mA ≤ IO≤ 1A 4.75 5.25 11.4 12.6 14.25 15.75 V
V
MIN
≤ VIN≤ V
MAX
(8 ≤ VIN≤ 20) (15.5 ≤ VIN≤ 27) (18.5 ≤ VIN≤ 30) V
∆V
O
Line Regulation IO= 500 mA TJ= 25˚C 3 50 4 120 4 150 mV
∆V
IN
(7 ≤ VIN≤ 25) (14.5 ≤ VIN≤ 30) (17.5 ≤ VIN≤ 30) V
−55˚C ≤ T
J
≤ +150˚C 50 120 150 mV
∆V
IN
(8 ≤ VIN≤ 20) (15 ≤ VIN≤ 27) (18.5 ≤ VIN≤ 30) V
I
O
≤ 1A TJ= 25˚C 50 120 150 mV
∆V
IN
(7.5 ≤ VIN≤ 20) (14.6 ≤ VIN≤ 27) (17.7 ≤ VIN≤ 30) V
−55˚C ≤ T
J
≤ +150˚C 25 60 75 mV
∆V
IN
(8 ≤ VIN≤ 12) (16 ≤ VIN≤ 22) (20 ≤ VIN≤ 26) V
∆V
O
Load Regulation TJ= 25˚C 5 mA ≤ IO≤ 1.5A 10 50 12 120 12 150 mV
250 mA ≤ I
P
≤ 750 mA 25 60 75 mV
−55˚C ≤ T
J
≤ +150˚C, 50 120 150 mV
5mA≤I
O
≤1A
I
Q
Quiescent Current IO≤ 1A TJ= 25˚C 6 6 6 mA
−55˚C ≤ T
J
≤ +150˚C 7 7 7 mA
∆I
Q
Quiescent Current 5 mA ≤ IO≤ 1A 0.5 0.5 0.5 mA
Change T
J
= 25˚C, IO≤ 1A 0.8 0.8 0.8 mA
V
MIN
≤ VIN≤ V
MAX
(8 ≤ VIN≤ 20) (15 ≤ VIN≤ 27) (18.5 ≤ VIN≤ 30) V
I
O
= 500 mA, −55˚C ≤ TJ≤ +150˚C 0.8 0.8 0.8 mA
V
MIN
≤ VIN≤ V
MAX
(8 ≤ VIN≤ 25) (15 ≤ VIN≤ 30) (18.5 ≤ VIN≤ 30) V
V
N
Output Noise Voltage TA= 25˚C, 10 Hz ≤ f ≤ 100 kHz 40 75 90 µV
Ripple Rejection IO≤ 1A, TJ= 25˚C or 68 80 61 72 60 70 dB
f = 120 Hz I
O
≤ 500 mA, 68 61 60 dB
−55˚C ≤ T
J
≤+150˚C
V
MIN
≤ VIN≤ V
MAX
(8 ≤ VIN≤ 18) (15 ≤ VIN≤ 25) (18.5 ≤ VIN≤ 28.5) V
R
O
Dropout Voltage TJ= 25˚C, IO= 1A 2.0 2.0 2.0 V
Output Resistance f = 1 kHz 8 18 19 mΩ
Short-Circuit Current T
J
= 25˚C 2.1 1.5 1.2 A
Peak Output Current T
J
= 25˚C 2.4 2.4 2.4 A
Average TC of V
OUT
0˚C ≤ TJ≤ +150˚C, IO= 5 mA −0.6 −1.5 −1.8 mV/˚C
V
IN
Input Voltage TJ= 25˚C, IO≤ 1A
Required to Maintain 7.5 14.6 17.7 V
Line Regulation
LM340/LM78MXX
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Page 4
LM340/LM7800C
Electrical Characteristics
(Note 4)
0˚C ≤ TJ≤ +125˚C unless otherwise specified
Output Voltage 5V 12V 15V
Symbol Input Voltage (unless otherwise noted) 10V 19V 23V Units
Parameter Conditions Min Typ Max Min Typ Max Min Typ Max
V
O
Output Voltage TJ= 25˚C, 5 mA ≤ IO≤ 1A 4.8 5 5.2 11.5 12 12.5 14.4 15 15.6 V
P
D
≤ 15W, 5 mA ≤ IO≤ 1A 4.75 5.25 11.4 12.6 14.25 15.75 V
V
MIN
≤ VIN≤ V
MAX
(7.5 ≤ VIN≤ 20) (14.5 ≤ VIN≤ 27) (17.5 ≤ VIN≤ 30) V
∆V
O
Line Regulation IO= 500 mA TJ= 25˚C 3 50 4 120 4 150 mV
∆V
IN
(7 ≤ VIN≤ 25) (14.5 ≤ VIN≤ 30) (17.5 ≤ VIN≤ 30) V
0˚C ≤ T
J
≤ +125˚C 50 120 150 mV
∆V
IN
(8 ≤ VIN≤ 20) (15 ≤ VIN≤ 27) (18.5 ≤ VIN≤ 30) V
I
O
≤ 1A TJ= 25˚C 50 120 150 mV
∆V
IN
(7.5 ≤ VIN≤ 20) (14.6 ≤ VIN≤ 27) (17.7 ≤ VIN≤ 30) V
0˚C ≤ T
J
≤ +125˚C 25 60 75 mV
∆V
IN
(8 ≤ VIN≤ 12) (16 ≤ VIN≤ 22) (20 ≤ VIN≤ 26) V
∆V
O
Load Regulation TJ= 25˚C 5 mA ≤ IO≤ 1.5A 10 50 12 120 12 150 mV
250 mA ≤ I
O
≤ 750 mA 25 60 75 mV
5mA≤I
O
≤1A, 0˚C ≤ TJ≤ +125˚C 50 120 150 mV
I
Q
Quiescent Current IO≤ 1A TJ= 25˚C 8 8 8 mA
0˚C ≤ T
J
≤ +125˚C 8.5 8.5 8.5 mA
∆I
Q
Quiescent Current 5 mA ≤ IO≤ 1A 0.5 0.5 0.5 mA
Change T
J
= 25˚C, IO≤ 1A 1.0 1.0 1.0 mA
V
MIN
≤ VIN≤ V
MAX
(7.5 ≤ VIN≤ 20) (14.8 ≤ VIN≤ 27) (17.9 ≤ VIN≤ 30) V
I
O
≤ 500 mA, 0˚C ≤ TJ≤ +125˚C 1.0 1.0 1.0 mA
V
MIN
≤ VIN≤ V
MAX
(7 ≤ VIN≤ 25) (14.5 ≤ VIN≤ 30) (17.5 ≤ VIN≤ 30) V
V
N
Output Noise Voltage TA= 25˚C, 10 Hz ≤ f ≤ 100 kHz 40 75 90 µV
Ripple Rejection IO≤ 1A, TJ= 25˚C 62 80 55 72 54 70 dB
f = 120 Hz or I
O
≤ 500 mA, 62 55 54 dB
0˚C ≤ T
J
≤ +125˚C
V
MIN
≤ VIN≤ V
MAX
(8 ≤ VIN≤ 18) (15 ≤ VIN≤ 25) (18.5 ≤ VIN≤
28.5)
V
R
O
Dropout Voltage TJ= 25˚C, IO= 1A 2.0 2.0 2.0 V
Output Resistance f = 1 kHz 8 18 19 mΩ
Short-Circuit Current T
J
= 25˚C 2.1 1.5 1.2 A
Peak Output Current T
J
= 25˚C 2.4 2.4 2.4 A
Average TC of V
OUT
0˚C ≤ TJ≤ +125˚C, IO= 5 mA −0.6 −1.5 −1.8 mV/˚C
V
IN
Input Voltage TJ= 25˚C, IO≤ 1A
Required to Maintain 7.5 14.6 17.7 V
Line Regulation
Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Conditions are conditions under which the device functions
but the specifications might not be guaranteed. For guaranteed specifications and test conditions see the Electrical Characteristics.
Note 2: The maximum allowable power dissipation at any ambient temperature is a function of the maximum junction temperature for operation (T
JMAX
= 125˚C or
150˚C), the junction-to-ambient thermal resistance (θ
JA
), and the ambient temperature (TA). P
DMAX
=(T
JMAX−TA
)/θJA. If this dissipation is exceeded, the die tem-
perature will rise above T
JMAX
and the electrical specifications do not apply. If the die temperature rises above 150˚C, the device will go into thermal shutdown. For
the TO-3 package (K, KC), the junction-to-ambient thermal resistance (θ
JA
) is 39˚C/W. When using a heatsink, θJAis the sum of the 4˚C/W junction-to-case thermal
resistance (θ
JC
) of the TO-3 package and the case-to-ambient thermal resistance of the heatsink. For the TO-220 package (T), θJAis 54˚C/W and θJCis 4˚C/W. If
SOT-223 is used, the junction-to-ambient thermal resistance is 174˚C/W and can be reduced by a heatsink (see Applications Hints on heatsinking).
If the TO-263 package is used, the thermal resistance can be reduced by increasing the PC board copper area thermally connected to the package: Using 0.5 square
inches of copper area, θ
JA
is 50˚C/W; with 1 square inch of copper area, θJAis 37˚C/W; and with 1.6 or more inches of copper area, θJAis 32˚C/W.
Note 3: ESD rating is based on the human body model, 100 pF discharged through 1.5 kΩ.
Note 4: All characteristics are measured with a 0.22 µF capacitor from input to ground and a 0.1 µF capacitor from output to ground. All characteristics except noise
voltage and ripple rejection ratio are measured using pulse techniques (t
w
≤ 10 ms, duty cycle ≤ 5%). Output voltage changes due to changes in internal temperature
must be taken into account separately.
Note 5: A military RETS specification is available on request. At the time of printing, the military RETS specifications for the LM140AK-5.0/883, LM140AK-12/883,
and LM140AK-15/883 complied with the min and max limits for the respective versions of the LM140A. At the time of printing, the military RETS specifications for
the LM140K-5.0/883, LM140K-12/883, and LM140K-15/883 complied with the min and max limits for the respective versions of the LM140. The LM140H/883,
LM140K/883, and LM140AK/883 may also be procured as a Standard Military Drawing.
LM340/LM78MXX
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Page 5
LM7808C
Electrical Characteristics
0˚C ≤ TJ≤ +150˚C, VI= 14V, IO= 500 mA, CI= 0.33 µF, CO= 0.1 µF, unless otherwise specified
Symbol Parameter Conditions (Note 6) LM7808C Units
Min Typ Max
V
O
Output Voltage TJ= 25˚C 7.7 8.0 8.3 V
∆V
O
Line Regulation TJ= 25˚C 10.5V ≤ VI≤ 25V 6.0 160 mV
11.0V ≤ V
I
≤ 17V 2.0 80
∆V
O
Load Regulation TJ= 25˚C 5.0 mA ≤ IO≤ 1.5A 12 160 mV
250 mA ≤ I
O
≤ 750
mA
4.0 80
V
O
Output Voltage 11.5V ≤ VI≤ 23V, 5.0 mA ≤ IO≤ 1.0A, P ≤ 15W 7.6 8.4 V
I
Q
Quiescent
Current
TJ= 25˚C 4.3 8.0 mA
∆I
Q
Quiescent With Line 11.5V ≤ VI≤ 25V 1.0 mA
Current Change
With
Load
5.0 mA ≤ I
O
≤ 1.0A 0.5
V
N
Noise TA= 25˚C, 10 Hz ≤ f ≤ 100 kHz 52 µV
∆V
I
/∆VORipple Rejection f = 120 Hz, IO= 350 mA, TJ= 25˚C 56 72 dB
V
DO
Dropout Voltage IO= 1.0A, TJ= 25˚C 2.0 V
R
O
Output Resistance f = 1.0 kHz 16 mΩ
I
OS
Output Short Circuit Current TJ= 25˚C, VI= 35V 0.45 A
I
PK
Peak Output Current TJ= 25˚C 2.2 A
∆V
O
/∆T Average Temperature IO= 5.0 mA 0.8 mV/˚C
Coefficient of Output Voltage
Note 6: All characteristics are measured with a 0.22 µF capacitor from input to ground and a 0.1 µF capacitor from output to ground. All characteristics except noise
voltage and ripple rejection ratio are measured using pulse techniques (t
w
≤ 10 ms, duty cycle ≤ 5%). Output voltage changes due to changes in internal temperature
must be taken into account separately.
Typical Performance Characteristics
Maximum Average Power
Dissipation
DS007781-22
Maximum Average Power
Dissipation
DS007781-23
Maximum Power
Dissipation (TO-263)
(See Note 2)
DS007781-24
LM340/LM78MXX
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Page 6
Typical Performance Characteristics (Continued)
Output Voltage (Normalized
to 1V at T
j
= 25˚C)
DS007781-25
Note: Shaded area refers to LM340A/LM340,
LM7805C, LM7812C and LM7815C.
Ripple Rejection
DS007781-26
Ripple Rejection
DS007781-27
Output Impedance
DS007781-28
Dropout Characteristics
DS007781-29
Quiescent Current
DS007781-30
Note: Shaded area refers to LM340A/LM340,
LM7805C, LM7812C and LM7815C.
Peak Output Current
DS007781-31
Dropout Voltage
DS007781-32
Note: Shaded area refers to LM340A/LM340,
LM7805C, LM7812C and LM7815C.
Quiescent Current
DS007781-33
LM340/LM78MXX
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Page 7
Typical Performance Characteristics (Continued)
Equivalent Schematic
Application Hints
The LM340/LM78XX series is designed with thermal protection, output short-circuit protection and output transistor safe
area protection. However, as with
any
IC regulator, it becomes necessary to take precautions to assure that the
regulator is not inadvertently damaged. The following describes possible misapplications and methods to prevent
damage to the regulator.
Shorting the Regulator Input: When using large capacitors
at the output of these regulators, a protection diode connected input to output (
Figure 1
) may be required if the input
is shorted to ground. Without the protection diode, an input
short will cause the input to rapidly approach ground potential, while the output remains near the initial V
OUT
because of
the stored charge in the large output capacitor. The capacitor
will then discharge through a large internal input to output diode and parasitic transistors. If the energy released by the
capacitor is large enough, this diode, low current metal and
the regulator will be destroyed. The fast diode in
Figure 1
will
shunt most of the capacitors discharge current around the
regulator. Generally no protection diode is required for values of output capacitance ≤ 10 µF.
Raising the Output Voltage above the Input Voltage:
Since the output of the device does not sink current, forcing
Line Regulation
140AK-5.0, I
OUT
= 1A, TA= 25˚C
DS007781-5
Line Regulation
140AK-5.0, V
IN
= 10V, TA= 25˚C
DS007781-6
DS007781-7
LM340/LM78MXX
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Page 8
Application Hints (Continued)
the output high can cause damage to internal low current
paths in a manner similar to that just described in the “Shorting the Regulator Input” section.
Regulator Floating Ground (
Figure 2
): When the ground
pin alone becomes disconnected, the output approaches the
unregulated input, causing possible damage to other circuits
connected to V
OUT
. If ground is reconnected with power
“ON”, damage may also occur to the regulator. This fault is
most likely to occur when plugging in regulators or modules
with on card regulators into powered up sockets. Power
should be turned off first, thermal limit ceases operating, or
ground should be connected first if power must be left on.
Transient Voltages: If transients exceed the maximum
rated input voltage of the device, or reach more than 0.8V
below ground and have sufficient energy, they will damage
the regulator. The solution is to use a large input capacitor, a
series input breakdown diode, a choke, a transient suppressor or a combination of these.
When a value for θ
(H–A)
is found using the equation shown,
a heatsink must be selected that has
a value that is less than
or equal to this number.
θ
(H–A)
is specified numerically by the heatsink manufacturer
in this catalog, or shown in a curve that plots temperature
rise vs power dissipation for the heatsink.
HEATSINKING TO-263 AND SOT-223 PACKAGE PARTS
Both the TO-263 (“S”) and SOT-223 (“MP”) packages use a
copper plane on the PCB and the PCB itself as a heatsink.
To optimize the heat sinking ability of the plane and PCB,
solder the tab of the plane.
shows for the TO-263 the measured values of θ
(J–A)
for different copper area sizes using a typical PCB with 1 ounce
copper
and no solder mask over the copper area used for
heatsinking
.
As shown in the figure, increasing the copper area beyond 1
square inch produces very little improvement. It should also
be observed that the minimum value of θ
(J–A)
for the TO-263
package mounted to a PCB is 32˚C/W.
As a design aid,
Figure 5
shows the maximum allowable
power dissipation compared to ambient temperature for the
TO-263 device (assuming θ
(J–A)
is 35˚C/W and the maxi-
mum junction temperature is 125˚C).
DS007781-8
FIGURE 1. Input Short
DS007781-9
FIGURE 2. Regulator Floating Ground
DS007781-10
FIGURE 3. Transients
DS007781-39
FIGURE 4. θ
(J–A)
vs Copper (1 ounce)
Area for the TO-263 Package
DS007781-40
FIGURE 5. Maximum Power Dissipation vs
T
AMB
for the TO-263 Package
LM340/LM78MXX
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Page 9
Application Hints (Continued)
Figures 6, 7
show the information for the SOT-223 package.
Figure 6
assumes a θ
(J–A)
of 74˚C/W for 1 ounce copper and
51˚C/W for 2 ounce copper and a maximum junction temperature of 125˚C.
Please see AN-1028 for power enhancement techniques to
be used with the SOT-223 package.
Typical Applications
DS007781-41
FIGURE 6. θ
(J–A)
vs Copper (2 ounce) Area
for the SOT-223 Package
DS007781-42
FIGURE 7. Maximum Power Dissipation vs
T
AMB
for the SOT-223 Package
Fixed Output Regulator
DS007781-13
Note: Bypass capacitors are recommended for optimum stability and
transient response, and should be located as close as possible to the
regulator.
High Input Voltage Circuits
DS007781-14
DS007781-15
LM340/LM78MXX
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Page 10
Typical Applications (Continued)
High Current Voltage Regulator
DS007781-16
High Output Current, Short Circuit Protected
DS007781-17
Positive and Negative Regulator
DS007781-18
LM340/LM78MXX
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Page 11
Connection Diagrams and Ordering Information
†
The specifications for the LM140H/883 devices are not contained in this datasheet. If specifications for these devices
are required, contact the National Semiconductor Sales Office/Distributors.
TO-3 Metal Can Package (K)
DS007781-11
Bottom View
Steel Package Order Numbers:
LM140K-5.0 LM140K-12 LM140K-15
LM340K-12 LM340K-15
LM340K-5.0
See Package Number K02A
LM140K-5.0/883 LM140K-12/883 LM140K-15/883
See Package Number K02C
TO-220 Power Package (T)
DS007781-12
Top View
Plastic Package Order Numbers:
LM340AT-5.0 LM340T-5.0
LM340T-12 LM340T-15
LM7805CT LM7812CT
LM7815CT LM7808CT
See Package Number T03B
TO-39 Metal Can Package (H)
DS007781-19
Top View
Metal Can Order Numbers
†
:
LM140H-5.0/883 LM140H-6.0/883
LM140H-8.0/883 LM140H-12/883
LM140H-15/883 LM140H-24/883
See Package Number H03A
TO-263 Surface-Mount Package (S)
DS007781-20
Top View
DS007781-21
Side View
Surface-Mount Package Order Numbers:
LM340S-5.0 LM340S-12
See Package Number TS3B
3-Lead SOT-223
(Front View)
Order Number LM340MP-5.0
Package Marked NO0A
See Package Number MA04A
DS007781-43
LM340/LM78MXX
www.national.com11
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Physical Dimensions inches (millimeters) unless otherwise noted
TO-3 Metal Can Package (K)
Order Number LM140K-5.0, LM340K-5.0, LM140K-12, LM340K-12,
LM140K-15, LM340K-15, LM7806CK, LM7808CK, LM7818CK or LM7824CK
NS Package Number K02A
TO-3 Metal Can Package (K)
Mil-Aero Products
Order Number LM140K-5.0/883, LM140K-12/883, or LM140K-15/883
NS Package Number K02C
LM340/LM78MXX
www.national.com 12
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
TO-263 Surface-Mount Package (S)
Order Number LM340S-5.0 or LM340S-12
NS Package Number TS3B
LM340/LM78MXX
www.national.com13
Page 14
Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
TO-220 Power Package (T)
Order Number LM340AT/LM340T-5.0, LM340AT/LM340T-12, LM340AT/LM340T-15,
LM7805CT, LM7812CT, LM7815CT, LM7806CT, LM7808CT, LM7818CT or LM7824CT
NS Package Number T03B
LM340/LM78MXX
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Physical Dimensions inches (millimeters) unless otherwise noted (Continued)
LIFE SUPPORT POLICY
NATIONAL’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT AND GENERAL
COUNSEL OF NATIONAL SEMICONDUCTOR CORPORATION. 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
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.
2. A critical component is 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.
National Semiconductor
Corporation
Americas
Tel: 1-800-272-9959
Fax: 1-800-737-7018
Email: support@nsc.com
National Semiconductor
Europe
Fax: +49 (0) 180-530 85 86
Email: europe.support@nsc.com
Deutsch Tel: +49 (0) 69 9508 6208
English Tel: +44 (0) 870 24 0 2171
Français Tel: +33 (0) 1 41 91 8790
National Semiconductor
Asia Pacific Customer
Response Group
Tel: 65-2544466
Fax: 65-2504466
Email: ap.support@nsc.com
National Semiconductor
Japan Ltd.
Tel: 81-3-5639-7560
Fax: 81-3-5639-7507
www.national.com
3-Lead SOT-223 Package
Order Part Number LM340MP-5.0
NS Package Number MA04A
LM340/LM78MXX Series 3-Terminal Positive Regulators
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.
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