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AVANTICS - AX78XX Series Specification No.: 050308-FE0003
AX78XX Series
3-Terminal Positive Voltage Regulators
Description
The AX78XX series can provide local on-card regulation, eliminating the
distribution problems associated with single point regulation. Each employs
internal current limiting, thermal shut-down and safe operating area protection,
making it essen-tially 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 external components to obtain
adjustable voltages and currents.
Features
• Output Current In Excess of 1A
• Output Voltages of 5V, 6V, 8V, 9V, 12V
• Internal Short-Circuit Current Limiting & Thermal Overload Protection
• Guaranteed In Extended Temperature Range
Absolute Maximum Ratings (T
A
=25°C)
Characteristic Symbol Rating Unit
Input Voltage V
IN
40 V
Power Dissipation P
D
Internally limited
(Note)
Operating Temperature T
opr
-30 to 85
o
C
Storage Temperature T
stg
-55 to 150
o
C
Junction Temperature T
j
150
o
C
Note: (1)T
A
=25
o
C, TO-251: 1W, TO-252: 1W, SOT-82: 2.1W, TO-220AB: 2.7W
(2)T
C
=25
o
C, All package: 10W
Thermal Data
Characteristic Symbol TO-252 TO-251 SOT-82 TO-220AB Unit
Thermal Resistance Junction-Case R
th(j-c)
12.5 12.5 12.5 12.5
o
C/W
Thermal Resistance Junction-Ambient R
th(j-a)
125 125 60 47
o
C/W
Schematic Diagram & Equivalent Circuit

AX78XX Series Pin Assignment
Schematic Diagram Equivalent Circuit
1
2
3
Tab
1
2
3
1 3
2
Starting
Circuit
Reference
Voltage
Current
Generator
Error
Amplifier
SOA
Protection
Thermal
Protection
Series
Pass
Element
Output
GND
Input
1
2
3
Tab
3-Lead Plastic TO-251
Package Code: I
Pin 1: V
IN
Pin 2 & Tab: GND
Pin 3: V
OUT
3-Lead Plastic TO-252
Package Code: J
Pin 1: V
IN
Pin 2 & Tab: GND
Pin 3: V
OUT
1
2
3
Tab
3-Lead Plastic SOT-82
Package Code: NE
Pin 1: V
IN
Pin 2: GND
Pin 3: V
OUT
3-Lead Plastic TO-220AB
Package Code: E
Pin 1: V
IN
Pin 2 & Tab: GND
Pin 3: V
OUT
VOUT
VIN