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MC78M12CDTXM

3-Terminal 0.5 A Positive Voltage Regulator

Fairchild Semiconductor 

Block Diagram

INPUT

1

CURRENT

GENERATOR

SERIES

PASS

ELEMENT

SOA

PROTECTION

OUTPUT

3

R1

STARTING

CIRCUIT

REFERENCE

VOLTAGE

ERROR

AMPLIFIER

THERMAL

PROTECTION

Figure 1. Block Diagram

R2

GND

2

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.

Symbol

Parameter

Value

Unit

VI

RθJC

RθJA

TOPR

TJ(MAX)

TSTG

Notes:

Input Voltage (for VO = 5 V)

Thermal Resistance, Junction-Case(2)

Thermal Resistance, Junction-Air(2, 3)

Operating Junction Temperature Range

Maximum Junction Temperature Range

Storage Temperature Range

TO-220 (TC = +25°C)

TO-220 (TA = +25°C)

D-PAK (TA = +25°C)

35

2.5

66

92

0 to +125

150

-65 to +150

V

°C/W

°C/W

°C

°C

°C

2. Thermal resistance test board.

Size: 76.2 mm x 114.3 mm x 1.6 mm (1S0P)

JEDEC standard: JESD51-3, JESD51-7

3. Assume no ambient airflow.

© 2001 Fairchild Semiconductor Corporation

KA78M05 / LM78M05 / MC78M05 Rev. 1.1.0

2

www.fairchildsemi.com

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