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The DIODES™ AL17051 is a universal AC high voltage input step down converter that provides accurate 3.3V or 5V output and outstanding dynamic performance and load regulation without requiring an optocoupler over line and load regulation. Typical applications are power supplies for offline low power IoT (Internet of Things) devices that support WPAN (Wireless Personal Area Network) connectivity.

To support Always-On requirements of IoT connectivity, the AL17051 features ultra-low standby operation power of 10mW. It also features high conversion efficiency 60% from rectified mains voltage to 3.3V or 5V for 50mA output and 50% at 10mA light loading during IoT system in idle and sleep mode.

With high-degree integration of the embedded 700V High-Voltage MOS switches, the AL17051 is designed to reduce external components and minimize e-BOM (Bill-Of-Material) with small form factor package and PCB space.

The AL17051 has rich protection features to enhance the system safety and reliability. It has Over Temperature Protection, VCC Under Voltage Lock Out function, Over Current Protection, and Over Load Protection.

The AL17051 is available in the SOT25 package.


  • Integrated MOSFET up to 700V
  • Fixed Option for Output 3.3V and 5V
  • No Load Operation Power Less than 10mW
  • High Efficiency 60% at 50mA Output
  • High Light-Load Efficiency 50% at 10mA Output
  • Universal 85 to 300VAC Input Range
  • Supports Low Component-Count Buck Topologies
  • Auto-Restart for Over Current and Over Load Faults
  • Excellent Load and Line Regulation
  • Fast Transient Response
  • Constant Voltage (CV) Control
  • Under Voltage Lock Out (UVLO) Protection for Input Voltage
  • Over Current Protection
  • Over Load Protection
  • Over Temperature Protection (OTP)
  • Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)
  • Halogen and Antimony Free. “Green” Device (Note 3)
  • For automotive applications requiring specific change control (i.e. parts qualified to AEC-Q100/101/104/200, PPAP capable, and manufactured in IATF 16949 certified facilities), please contact us or your local Diodes representative. https://www.diodes.com/quality/product-definitions/


  • Home appliance applications
  • IoT applications
  • Industrial controls
  • Low standby power applications

Product Specifications

Product Parameters

Minimum Input AC Voltage (VAC) 85
Maximum Input AC Voltage (VAC) 300
Maximum DC VDD (VDC) 560
Frequency (kHz) up to 50
Accuracy (%) 2.5 %
Efficiency (%) 65 %
SupplyCurrent (mA) 0.7 mA
Temperature Range (°C) -40 to 105 °C

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