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The AL8861 is a hysteresis mode DC-DC step-down converter, designed for driving single or multiple series connected LEDs efficiently from a voltage source higher than the LED voltage. The device can operate from an input supply between 4.5V and 40V and provide an externally adjustable output current up to 1A for TSOT25 package and 1.5A for SOT89-5 package. Depending upon supply voltage and external components, this converter can provide up to 40 watts of output power.


  • LED Retrofit for Low Voltage Halogen 
  • Low Voltage Industrial Lighting
  • LED Backlighting
  • Illuminated Signs
  • External Driver with Multiple Channels


  • Low BOM Counts
  • Wide Input Voltage Range: 4.5V to 40V
  • Output Current up to 1.5A
  • Internal 40V NDMOS Switch
  • Typical 5% Output Current Accuracy
  • Single Pin for On/Off and Brightness Control by DC Voltage or
  • PWM Signal
  • Recommended Analog Dimming Range: 5% ~100%
  • Soft-Start
  • High Efficiency (up to 97%)
  • LED Short Protection
  • Inherent Open-Circuit LED Protection
  • Rs Short Protection
  • Over Temperature Protection (OTP)
  • Up to 1MHz Switching Frequency
  • Pb-free TSOT25 and SOT89-5 Packages

Product Specifications

Product Parameters

Qualified to AECQ10x Yes
Automotive Compliant PPAP AL8861Q
Topologies (Buck) Yes
Topologies (Buck-Boost) No
Topologies (Boost) No
Minimum Input Voltage 4.5 V
Maximum Input Voltage 40 V
Maximum Output Voltage 36 V
Maximum LED Current 1.5 A
LED Current Accuracy 5 %
Switching Frequency Maximum 1000 kHz
Dimming (PWM) Yes
Dimming (Analog) Yes
Efficiency 97 %
Operating Temperature Range -40 to 105 °C
Sense Voltage 100 mV
AEC-Q100 Grade 1

Related Content



Technical Documents



Evaluation Boards and User Guides

Recommended Soldering Techniques


Orderable Part Number Authorized Distributor Quantity Inventory Date Buy Online Region
AL8861MP-13 Digi-Key Electronics 5828 4/3/2020 Buy Now United States
AL8861MP-13 Mouser Electronics Inc. 24049 4/3/2020 Buy Now United States
AL8861WT-7 Arrow Electronics 450 4/3/2020 Buy Now United States
AL8861WT-7 Arrow Electronics Central EU 3000 4/3/2020 Buy Now Germany
AL8861WT-7 Digi-Key Electronics 11773 4/3/2020 Buy Now United States
AL8861WT-7 Mouser Electronics Inc. 5716 4/3/2020 Buy Now United States
AL8861Y-13 Arrow Electronics 58 4/3/2020 Buy Now United States
AL8861Y-13 Digi-Key Electronics 18005 4/3/2020 Buy Now United States
AL8861Y-13 Mouser Electronics Inc. 17393 4/3/2020 Buy Now United States
AL8861Y-13 Future Electronics - Europe 17500 4/2/2020 England