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The AP3917B/C/D is a universal AC high-voltage input, step-down power switcher. The main applications are especially suited for home appliance and IoT applications with a non-isolated buck solution or offline flyback solution.

Working with a single-winding inductor and integrating a 650V(AP3917B/C) or 700V(AP3917D) MOSFET internal can make the device use fewer external components and create a low bill of material (BOM) cost solution.

The AP3917B/C/D can achieve excellent regulation and high power efficiency. The peak current and switching frequency continuously reduce as the load decreases, so it can get excellent efficiency performance at light load and improve the overall system efficiency.

The AP3917B/C/D has multiple protection features to enhance the system safety and reliability. It has over temperature protection, under-voltage lock function, output short protection, overload protection, and open-loop protection.


  • Non-Isolated and Isolated Home Appliances


  • Universal 90 to 265 VAC Input Range
  • Internal MOSFET of 650V/650V/700V for AP3917B/C/D
  • Improved Constant Voltage: ±5%
  • Maximum 170/270/370mA Rated Output Current for AP917B/C/D
  • No Load Power Consumption: < 30mW With External Bias
  • Frequency Modulation to Suppress EMI
  • Various Protections: OTP, OLP, SCP
  • Fewer Components
  • Low Audible Noise Solution

Product Specifications

Product Parameters

Collector DC Current 0.8 A
Startup Current 26 µA
Operating Current 200 µA
UVLO Threshold on/off 6.5/4.5 V
Power Rating 2 W
Standby Power 30 mW
Cable Compensation 0%

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Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
AP3917BS7-13 Digi-Key Electronics 3770 9/17/2019 Buy Now United States
AP3917BS7-13 Mouser Electronics Inc. 7970 9/17/2019 Buy Now United States


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