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LM78XX/LM78XXA
3-Terminal 1A Positive Voltage Regulator
Features
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General Description

Output Current up to 1A
Output Voltages of 5, 6, 8, 9, 10, 12, 15, 18, 24
Thermal Overload Protection
Short Circuit Protection
Output Transistor Safe Operating Area Protection

The LM78XX series of three terminal positive regulators
are available in the TO-220 package and withseveral
fixed output voltages, making them useful in a wide
range of applications. Each type employs internal current
limiting, thermal shut down and safe operating area protection, making it essentially indestructible. If adequate
heat sinking is provided, they can deliver over 1A output
current. Although designed primarily as fixed voltage
regulators, these devices can be used with externalcomponents to obtain adjustable voltages and currents.

Ordering Information
Product Number

Output Voltage Tolerance

Package

Operating Temperature

LM7805CT

±4%

TO-220

-40°C to +125°C

LM7806CT
LM7808CT
LM7809CT
LM7810CT
LM7812CT
LM7815CT
LM7818CT
LM7824CT
LM7805ACT

0°C to +125°C

±2%

LM7806ACT
LM7808ACT
LM7809ACT
LM7810ACT
LM7812ACT
LM7815ACT
LM7818ACTLM7824ACT

© 2010 Fairchild Semiconductor Corporation
LM78XX/LM78XXA Rev. 1.0

www.fairchildsemi.com
1

LM78XX/LM78XXA — 3-Terminal 1A Positive Voltage Regulator

April 2010

LM78XX/LM78XXA 3-Terminal 1A Positive Voltage Regulator

Block Diagram
Input

Series Pass
Element

1
Current
Generator

Starting
Circuit

Output
3

SOA
Protection

Reference
Voltage

ErrorAmplifier

Thermal
Protection
GND
2

Figure 1.

Pin Assignment
TO-220
GND

1. Input
2. GND
3. Output

1

Figure 2.

Absolute Maximum Ratings
Absolute maximum ratings are those values beyond which damage to the device may occur. The datasheet
specifications should be met, without exception, to ensure that the system design is reliable over its power supply,
temperature, andoutput/input loading variables. Fairchild does not recommend operation outside datasheet
specifications.

Symbol
Input Voltage

Value

Unit

VO = 5V to 18V

35

V

VO = 24V

VI

Parameter

40

V

RθJC

Thermal Resistance Junction-Cases (TO-220)

5

°C/W

RθJA

Thermal Resistance Junction-Air (TO-220)

65

°C/W

TOPR

Operating Temperature
Range

-40to +125

°C

TSTG

LM78xx
LM78xxA

Storage Temperature Range

-65 to +150

2

LM78XX/LM78XXA Rev. 1.0

0 to +125
°C

www.fairchildsemi.com

Refer to the test circuits. -40°C < TJ < 125°C, IO = 500mA, VI = 10V, CI = 0.1µF, unless otherwise specified.

Symbol

Typ.

Max.

Unit

TJ = +25°C

4.8

5.0

5.2

V

4.75

5.0

5.25

VO = 7V to 25V

–

4.0100

VI = 8V to 12V

–

1.6

50.0

IO = 5mA to 1.5A

–

9.0

100

IO = 250mA to 750mA

–

4.0

50.0

–

5.0

8.0

mA

Quiescent Current Change IO = 5mA to 1A

–

0.03

0.5

mA

VI = 7V to 25V

Regline

Min.

5mA ≤ IO ≤ 1A, PO ≤ 15W,
VI = 7V to 20V

VO

Parameter

–

0.3

1.3

IO = 5mA

–

-0.8

–

mV/°C

f = 10Hz to 100kHz,TA = +25°C

–

42.0

–

µV/VO

62.0

73.0

–

dB

IO = 1A, TJ = +25°C

–

2.0

–

V

f = 1kHz

–

15.0

–

mΩ

VI = 35V, TA = +25°C

–

230

–

mA

TJ = +25°C

–

2.2

–

A

Output Voltage

Line Regulation(1)

Regload Load

IQ
∆IQ
∆VO/∆T
VN
RR
VDROP

Regulation(1)

Quiescent Current

Output Voltage

Drift(2)

OutputNoise Voltage
Ripple

Rejection(2)

Dropout Voltage
Resistance(2)

rO

Output

ISC

Short Circuit Current

IPK

(2)

Peak Current

Conditions

TJ = +25°C
TJ = +25°C
TJ = +25°C

f = 120Hz, VO = 8V to 18V

mV

mV

Notes:
1. Load and line regulation are specified at constant junction temperature. Changes in VO due to heating effects must
be taken into account...