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AS78XXA
Document number: DS36562 Rev. 3 - 2
1 of 23
www.diodes.com
September 2013
© Diodes Incorporated
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S78XXA
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Product Line o
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Diodes Incorporated
1A 3-TERMINAL POSITIVE VOLTAGE REGULATOR
Description
The AS78XXA series are three terminal positive voltage regulators
designed for a wide variety of applications including local, on-card
regulation.
The AS78XXA are complete with internal current limiting, thermal
shutdown protection, and safe-area compensation which make them
virtually immune from output overload. If adequate heat sinking is
provided, these regulators can deliver output currents up to 1A.
The AS78XXA are available in TO-252-2 (3), TO-252-2 (4), TO-252-2
(5), TO-220-3 and TO-220F-3 packages.
Applications
High Efficiency Linear Regulator
Post Regulation for Switching Supply
Microprocessor Power Supply
Mother Board
Features
Output Current up to 1A
Fixed Output Voltages of 5V, 6V, 8V, 9V, 12V, 15V and 18V
Output Voltage Accuracy of ±4% over the Full Temperature
Range
Internal Short Circuit Current Limiting
Internal Thermal Overload Protection
Output Transistor Safe-area Protection
Low Load Regulation
Stable Performance in High Temperature
TO-220-3 and TO-220F-3
Lead-Free Finish; RoHS Compliant (Notes 1 & 2)
Lead-Free Packages: TO-252-2 (3), TO-252-2 (4), TO-252-2 (5)
Totally Lead-Free; RoHS Compliant (Notes 4 & 2)
Available in “Green” Packages: TO-220-3 and TO-220F-3
Lead-Free Finish; RoHS Compliant (Notes 1 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Lead-Free Packages, Available in “Green” Molding Compound:
TO-252-2 (3), TO-252-2 (4), TO-252-2 (5)
Totally Lead-Free & Fully RoHS Compliant (Notes 4 & 2)
Halogen and Antimony Free. “Green” Device (Note 3)
Notes: 1. EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. All applicable RoHS exemptions applied.
2. See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free, "Green"
and Lead-free.
3. Halogen- and Antimony-free "Green” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and
<1000ppm antimony compounds.
4. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.
Pin Assignments
T Package T Package
(TO-220-3) (Option 1) (TO-220-3) (Option 2)
T Package TF Package
(TO-220-3) (Option 3) (TO-220F-3)
1
2
3
INPUT
OUTPUT
GND
1
2
3
INPUT
OUTPUT
GND
1
2
3
INPUT
OUTPUT
GND
1
2
3
OUTPUT
INPUT
GND
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