© 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 TA = 25°C unless otherwise noted.

Symbol

Parameter

Value

Unit

VI

Input Voltage

VO = 5 V to 18 V

35

V

VO = 24 V

40

RθJC

Thermal Resistance, Junction-Case (TO-220)

5

°C/W

RθJA

Thermal Resistance, Junction-Air (TO-220)

65

°C/W

TOPR

Operating Temperature Range

LM78xx

-40 to +125

°C

LM78xxA

0 to +125

TSTG

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