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LM340MPX-5.0 |LM340MPX50NSC ?N/a720avaiSeries 3-Terminal Positive Regulators
LM340S-5.0 |LM340S50NSC N/a760avaiSeries 3-Terminal Positive Regulators
LM340SX5.0 |LM340SX50NSN/a358avaiSeries 3-Terminal Positive Regulators
LM340MP-5.0 |LM340MP50NSN/a1922avaiSeries 3-Terminal Positive Regulators
LM340MPX-5.0 |LM340MPX50NSN/a1164avaiSeries 3-Terminal Positive Regulators
LM340AT-5.0 |LM340AT50NSCN/a4avaiTHREE TERMINAL POSITIVE FIXED VOLTAGE REGULATORS
LM340K-12 |LM340K12NSCN/a41avaiSeries 3-Terminal Positive Regulators
LM340K-12 |LM340K12NSN/a38avaiSeries 3-Terminal Positive Regulators
LM340K-5.0 |LM340K50NSN/a158avaiSeries 3-Terminal Positive Regulators
LM340SX-5.0 |LM340SX50NSN/a2450avaiSeries 3-Terminal Positive Regulators
LM340SX-5.0 |LM340SX50NSC N/a750avaiSeries 3-Terminal Positive Regulators
LM340T12 |LM340T12NS N/a350avaiTHREE TERMINAL POSITIVE FIXED VOLTAGE REGULATORS
LM340T-12 |LM340T12NSN/a4015avaiTHREE TERMINAL POSITIVE FIXED VOLTAGE REGULATORS
LM340T15进口NSN/a500avaiTHREE TERMINAL POSITIVE FIXED VOLTAGE REGULATORS
LM340T15NSN/a810avaiTHREE TERMINAL POSITIVE FIXED VOLTAGE REGULATORS
LM340T-15 |LM340T15NSN/a2025avaiTHREE TERMINAL POSITIVE FIXED VOLTAGE REGULATORS
LM340T-5.0 |LM340T50NSN/a5248avaiTHREE TERMINAL POSITIVE FIXED VOLTAGE REGULATORS
LM7808CTFAIRCHILDN/a1835avaiSeries 3-Terminal Positive Regulators
LM7808CT. |LM7808CTNSN/a10avaiSeries 3-Terminal Positive Regulators


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LM340AT-5.0-LM340K-12-LM340K-5.0-LM340MP-5.0-LM340MPX-5.0-LM340S-5.0-LM340SX5.0-LM340SX-5.0-LM340T12 -LM340T-12-LM340T15-LM340T-15-LM340T-5.0-LM7808CT-LM7808CT.
Series 3-Terminal Positive Regulators
LM340/LM78XX Series
3-Terminal Positive Regulators
General Description

The LM140/LM340A/LM340/LM78XXC monolithic
3-terminal positive voltage regulators employ internal
current-limiting, thermal shutdown and safe-area compensa-
tion, making them essentially indestructible.If adequate heat
sinkingis provided, they can deliver over 1.0A output cur-
rent. Theyare intendedas fixed voltage regulatorsina wide
rangeof applications including local (on-card) regulationfor
eliminationof noise and distribution problems associated
with single-point regulation.In additionto useas fixed volt-
age regulators, these devices canbe used with external
componentsto obtain adjustable output voltages and cur-
rents.
Considerable effort was expendedto makethe entire series regulators easyto use and minimizethe numberof exter-
nal components.Itis not necessaryto bypass the output,
although this does improve transient response. Input by-
passingis needed onlyifthe regulatoris locatedfar fromthe
filter capacitorof the power supply.
The 5V, 12V, and 15V regulator options are availablein the
steel TO-3 power package. The LM340A/LM340/LM78XXC
seriesis availableinthe TO-220 plastic power package, and
the LM340-5.0is availableinthe SOT-223 package,as well the LM340-5.0 and LM340-12in the surface-mount TO-
263 package.
Features
Complete specificationsat1A load Output voltage tolerancesof ±2%atTj= 25˚C and ±4%
overthe temperature range (LM340A) Line regulationof 0.01%of VOUT/Vof ΔVINat1A load
(LM340A) Load regulationof 0.3%of VOUT/A (LM340A) Internal thermal overload protection Internal short-circuit current limit Output transistor safe area protectionP+ Product Enhancement tested
Typical Applications
Fixed Output Regulator Adjustable Output Regulator

*Requiredifthe regulatoris locatedfar fromthe power supply filter.
**Althoughno output capacitoris neededfor stability,it doeshelp transient
response.(If needed,use0.1µF, ceramic disc).
VOUT=5V+ (5V/R1+IQ)R2 5V/R1> 3IQ,
load regulation(Lr)≈ [(R1+ R2)/R1](Lrof LM340-5).
Current Regulator
Comparison between SOT-223 and D-Pak (TO-252)
Packages

ΔIQ=1.3mA overlineandload changes.
Scale 1:1
November 2004
LM340/LM78XX
Series
3-T
erminal
Positive
Regulators
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