Diodes Incorporated

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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 are provided, these regulators can deliver output currents up to 1A. The AS78XXA are available in TO-252-2 (1), TO- 252-2 (3), TO-252-2 (4), TO-220-3 and TO-220F-3 packages.


· High Efficiency Linear Regulator · Post Regulation for Switching Supply · Microprocessor Power Supply · Mother Board

Product Specifications

Product Parameters

Iq (typ) (µA) 3200
AEC Qualified No
Compliance (Only Automotive supports PPAP) Standard
Type Linear Regulator
Output options Fixed
Iout (A) 1
Vin (Max) (V) 29
Fixed Vout (V) 9
Accuracy 25C 2
VDROPOUT (Max) (V) at Max Current and Max Ouput Voltage 2
Operating Temperature (Ambient) (°C) -40 to 125
Enable Active No
Channels 1
Output Discharge No
Power Good No
Reverse Protection No
VCTL Function No

Technical Documents

Recommended Soldering Techniques


Product Change Notices (PCNs)

A PCN may only apply to specific orderable part numbers in this datasheet. Please refer to the corresponding PCN to see the exact orderable part number(s) affected.

PCN # Issue Date Implementation Date Subject
PCN-2642 2023-09-05 2024-03-05 Device End of Life (EOL)
PCN-2568 2022-03-29 2022-03-29 Qualified Additional Assembly & Test (A/T) Sites, Bill of Material, and updated Data Sheets for Package Outline Dimension Change