LM78XX / LM78XXA 3-Terminal 1 A Positive Voltage Regulator
September 2014
LM78XX / LM78XXA
3-Terminal 1 A Positive Voltage Regulator
Features Description
Output Current up to 1 A The LM78XX series of three-terminal positive regulators
is available in the TO-220 package and with several fixed
Output Voltages: 5, 6, 8, 9, 10, 12, 15, 18, 24 V
output voltages, making them useful in a wide range of
Thermal Overload Protection
applications. Each type employs internal current limiting,
Short-Circuit Protection
thermal shut-down, and safe operating area protection. If
Output Transistor Safe Operating Area Protection
adequate heat sinking is provided, they can deliver over
1 A output current. Although designed primarily as fixed-
voltage regulators, these devices can be used with exter-
nal components for adjustable voltages and currents.
(Single Gauge)
TO-220
GND
1. Input
1
2. GND
3. Output
(1)
Ordering Information
Output Voltage Operating
Product Number Package Packing Method
Tolerance Temperature
LM7805CT
LM7806CT
LM7808CT
LM7809CT
LM7810CT 4% -40C to +125C
LM7812CT
LM7815CT
TO-220
Rail
(Single Gauge)
LM7818CT
LM7824CT
LM7805ACT
LM7809ACT
LM7810ACT 2% 0C to +125C
LM7812ACT
LM7815ACT
Note:
1. Above output voltage tolerance is available at 25C.
2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM78XX / LM78XXA Rev. 1.3.1 LM78XX / LM78XXA 3-Terminal 1 A Positive Voltage Regulator
Block Diagram
Input
Series Pass Output
Element
1
3
Current SOA
Generator Protection
Starting Reference Error
Circuit Voltage Amplifier
Thermal
Protection
GND
2
Figure 1. Block Diagram
Absolute Maximum Ratings
Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be opera-
ble above the recommended operating conditions and stressing the parts to these levels is not recommended. In addi-
tion, extended exposure to stresses above the recommended operating conditions may affect device reliability. The
absolute maximum ratings are stress ratings only. Values are at T = 25C unless otherwise noted.
A
Symbol Parameter Value Unit
V = 5 V to 18 V 35
O
V Input Voltage V
I
V = 24 V 40
O
R Thermal Resistance, Junction-Case (TO-220) 5 C/W
JC
R Thermal Resistance, Junction-Air (TO-220) 65 C/W
JA
LM78xx -40 to +125
T Operating Temperature Range C
OPR
LM78xxA 0 to +125
T Storage Temperature Range - 65 to +150 C
STG
2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM78XX / LM78XXA Rev. 1.3.1 2