Diodes Incorporated
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AZ78L09 (Obsolete)

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The AZ78LXX series are three terminal positive regulators with several fixed output voltages. These regulators can provide local on card regulation, eliminating the distribution problems associated with single point regulation. The AZ78LXX can be used in logic systems, instrumentation, HiFi, and other solid state electronic equipment. When used as a Zener diode/resistor combination replacement, the AZ78LXX usually results an effective output impedance improvement of two orders of magnitude, and lower quiescent current. With adequate heat sinking the AZ78LXX can deliver 100mA output current. Current limiting is included to limit the peak output current to a safe value. Thermal protection is also provided. If internal power dissipation becomes too high for the heat sinking provided, the thermal shutdown circuit takes over preventing the IC from overheating. The AZ78LXX are available in the plastic TO-92 (bulk or ammo packing), SOT-223 and SOT-89 packages.


  • High Efficiency Linear Regulator
  • Post Regulation for Switching Supply
  • Microprocessor Power Supply
  • Mother Board I/O Power Supply

Product Specifications

Product Parameters

Compliance (Only Automotive supports PPAP) -
Dropout Voltage Typical (V) 1.6
Operating Ambient Temperature Range (Junction Temperature) (°C) -40 to 125
Operating Input Voltage (V) 18
Output Current (mA) 0.15
Output Voltage (V) 9
PSRR Typ @ 120hz (dB) 44
AEC Qualified -
Quiescent Current Typ (mA) 3

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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-2331 2018-03-22 2018-06-22 Additional Qualified BOM (Bill of Materials) on Selected Devices