Diodes Incorporated

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30V Adjustable Current Sink Linear LED Driver

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The AL5802 combines a high gain NPN transistor with a prebiased NPN transistor to make a simple small footprint LED driver. The LED current is set by an external resistor connected to from REXT pin (6) to GND pin (4), the internal high gain transistor develops approximately 0.6V across the external resistor. The AL5802 open-collector output can operate from 0.8V to 30V enabling it to operate from 5V to 24V power supplies without additional components. PWM dimming of the LED current can be achieved by either driving the BIAS pin (2) with a low impedance voltage source, or driving the EN pin (3) with an external opencollector NPN transistor or open-drain N-channel MOSFET. The AL5802 is available in a SOT26 package and is ideal for driving 20mA to 120mA LED currents.


  • Reference voltage VRSET = 0.65V
  • -40 to 125°C temperature range
  • 0.8V to 30V open-collector output
  • Negative temperature co-efficient – automatically reduce the LED current at high temperatures
  • Low thermal impedance SOT26 with copper leadframe
  • SOT26: Available in “Green” Molding Compound (No Br, Sb)
  • Qualified to AEC-Q101 Standards for High Reliability


  • Linear LED Driver
  • LED Signs
  • Offline LED Luminaries

Product Specifications

Product Parameters

AEC Qualified No
Compliance (Only Automotive supports PPAP) Standard
Topology Linear LED Driver
Minimum Supply Voltage (V) 4.5 V
Maximum Supply Voltage (V) 30 V
Maximum VOUT (V) 30 V
Number of Channels 1
LED Current Sense Voltage (mV) 650 mV
Output Current (mA) 120 mA
Channel Max. Output Current (mA) 120 mA
Accuracy (%) N/A %
Dimming PWM
Temperature Range (°C) -40 to 125 °C

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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-2461 2020-05-08 2021-04-05 Phenitec Wafer Manufacturing Site Change, Additional Wafer Sources, Wafer Diameter Change, Additional Assembly and Test Site
PCN-2315 2018-03-09 2018-06-09 Qualification of Alternative Wafer Sources for Select Products Due to Closure of Diodes FabTech (KFAB) Facility


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