Diodes Incorporated

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AL8821 (Not Recommended for new design)

NRND = Not Recommended for New Design


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The AL8821 is a boost converter that delivers an accurate constant current for MR16 and similar LED Lamps. With proprietary control scheme, the LED driver is compatible with many commonly used electronic transformers and provides designs with High Power Factor (PF) and low Total Harmonic Distortion (THD) for these applications. The operation frequency is up to 1MHz that allows the use of small size inductor. With the package of SO-8EP, the AL8821 has small thermal resistance and can be used for wide range of output power. The driver can be used for dimmable MR16 application and can be compatible with leading-edge dimmer and trailing-edge dimmer.


  • Wide Input Voltage Range: 5V to 36V
  • Internal 40V NDMOS Switches
  • Continuous Conduction Mode (CCM) Operation
  • Up to 1MHz Switching Frequency
  • High PF > 0.9 and Low THD < 30% and low Ripple < 20%
  • Compatible With Leading-edge Dimmer And Trailing-edge Dimmer
  • Internal Protections
  • Under Voltage Lock Out (UVLO)
  • Output Open
  • Over Temperature Protection (OTP)


  • Non-dimmable MR16 Lamps
  • Dimmable MR16 Lamps
  • General Illumination Lamps

Product Specifications

Product Parameters

AEC Qualified No
AEC-Q100 Grade No
Compliance (Only Automotive supports PPAP) Standard
Compliance (Only Automotive supports PPAP) Standard
Dimming (Analog) No
Dimming (PWM) No
Efficiency (%) 85
Efficiency (%) 85
LED Current Accuracy (%) 5
LED Current Accuracy (%) 5
MaximumInput Voltage (V) 36
Maximum Input Voltage (V) 36
Maximum LED Current (A) 1
Maximum LED Current (A) 1
Maximum Output Voltage (V) 36
Maximum Output Voltage (V) 36
MinimumInput Voltage (V) 5
Minimum Input Voltage (V) 5
OperatingTemperatureRange  (°C) -40 to 105
Operating Temperature Range (°C) -40 to 105
AEC Qualified No
Sense Voltage (mV) 100
Sense Voltage (mV) 100
Switching Frequency Maximum (kHz) 1000
Switching Frequency Maximum (kHz) 1000
Topologies (Boost) Yes
Topologies (Buck-Boost) No
Topologies (Buck) No
Topologies (Charge Pump) No

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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-2602 2023-01-31 2023-07-31 Device End of Life (EOL)
PCN-2512 2021-04-16 2021-07-16 Qualified Additional Assembly & Test (A/T) Site