Diodes Incorporated

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AL1781 (Not Recommended for new design)

NRND = Not Recommended for New Design

Single-Channel Dimmable Linear LED Driver

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The a AL1781, a single-channel dimmable Linear LED driver with PWM dimming control, is targeted for 1-Channel dimmable Smart Connected Lighting (SCL) applications. It serves as the LED driving element along with AC-DC Power Conversion Block and Intelligent wireless MCU as an emerging connected lighting applications.


  • Input Voltage Range: 6.5V to 30V
  • Independent PWM dimming control for each channel
  • Adjustable Reference Current by external reference resistors
  • LED Current Accuracy ≤ ±4%
  • Maximum LED current 1500mA for AL1781 and 750mA Per channel for AL1782
  • Adaptive Thermal Management (ATM) scheme to minimize power dissipation
  • High Frequency E-flicker free PWM dimming 
  • Internal Protections: 
    • Undervoltage Lockout (UVLO);
    • LED string open/short protection;
    • Over-temperature protection (OTP): Thermal shutdown and auto thermal recovery
  • Fault Reports: UVLO, OTP, LED Open/Short


  • 1-Channel Dimmable Smart Connected Light (SCL) Bulbs
  • Multiple-Channel of SCL Bulbs
  • Smart Connected LED Tubes, Panel Lights, Troffers, and Ceiling Lights

Product Specifications

Product Parameters

Accuracy (%) 4
Compliance (Only Automotive supports PPAP) Standard
Channel Max. Output Current (mA) 1500
Compliance (Only Automotive supports PPAP) Standard
Dimming PWM
LED Current (A) 1500
LED Current Sense Voltage (mV) N/A
Maximum Supply Voltage (V) 30
Maximum VOUT (V) N/A
Minimum Supply Voltage (V) 6.5
Number of Channels 1
Output Current (mA) 1500
AEC Qualified No
Temperature Range (°C) -40 to 105
Topology Linear LED Driver

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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-2610 2023-03-30 2023-09-30 Device End of Life (EOL)


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