Data Sheet

LM78XX / LM78XXA — 3-Terminal 1 A Positive Voltage Regulator
© 2006 Fairchild Semiconductor Corporation www.fairchildsemi.com
LM78XX / LM78XXA Rev. 1.3.1 2
Block Diagram
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
A
= 25°C unless otherwise noted.
Symbol Parameter Value Unit
V
I
Input Voltage
V
O
= 5 V to 18 V 35
V
V
O
= 24 V 40
R
θJC
Thermal Resistance, Junction-Case (TO-220) 5 °C/W
R
θJA
Thermal Resistance, Junction-Air (TO-220) 65 °C/W
T
OPR
Operating Temperature Range
LM78xx -40 to +125
°C
LM78xxA 0 to +125
T
STG
Storage Temperature Range - 65 to +150 °C
Starting
Circuit
Input
1
Reference
Voltage
Current
Generator
SOA
Protection
Thermal
Protection
Series Pass
Element
Error
Amplifier
Output
3
GND
2