AL8843SP-13 LED Driver IC Equivalent & Substitute Parts

Part Overview

The AL8843SP-13 is an active LED driver IC manufactured by Diodes Incorporated, designed for step-down (buck) topology applications requiring 3A output current. This component integrates an internal switch and supports analog and PWM dimming for backlight, lighting, and signage applications. The part operates across a 4.5V to 40V supply range with a 1MHz switching frequency and is housed in an 8-SO-EP package.

Substitute parts are identified when equivalent functional performance can be achieved through alternative topologies, manufacturers, or package configurations while maintaining compatibility with the application's electrical and mechanical requirements.

Substiute Parts

AL8843SP-13

Diodes IncorporatedIn Stock: 30195AL8843SP-13 Datasheet

Current PartRFQ

LM3530UME-40B/NOPB

Texas InstrumentsIn Stock: 6273LM3530UME-40B/NOPB Datasheet

MFR RecommendedRFQ

LM3553SDX/NOPB

Texas InstrumentsIn Stock: 2043LM3553SDX/NOPB Datasheet

MFR RecommendedRFQ

LTC3202EDD#PBF

Analog Devices Inc.In Stock: 882LTC3202EDD#PBF Datasheet

MFR RecommendedRFQ

MIC3289-24YD6-TR

Microchip TechnologyIn Stock: 3238MIC3289-24YD6-TR Datasheet

MFR RecommendedRFQ

TPS61160ADRVR

Texas InstrumentsIn Stock: 17210TPS61160ADRVR Datasheet

MFR RecommendedRFQ

TPS61160DRVT

Texas InstrumentsIn Stock: 2213TPS61160DRVT Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the AL8843SP-13 is determined by the following criteria:

Primary Substitution Parameters:

• Internal switch integration (required)
• Single output configuration (required)
• LED driver functionality with dimming capability
• Surface mount packaging
• ROHS3 compliance and active product status

Topology Consideration: The AL8843SP-13 employs step-down (buck) topology. Substitute parts identified in the provided list utilize alternative topologies (step-up/boost and switched capacitor charge pump). These alternatives are listed as manufacturer-recommended substitutes and function as equivalent LED driver solutions despite topology differences. Topology selection depends on application-specific voltage conversion requirements.

Current and Voltage Parameters: Substitute parts vary in output current capacity (30mA to 1.2A) and supply voltage ranges (2.5V to 18V). Selection must align with specific application current and voltage requirements.

Dimming Control: The AL8843SP-13 supports analog and PWM dimming. Substitute parts support PWM or I2C dimming control methods. Dimming method compatibility must be verified against application requirements.

Parameter Comparison

Engineering Selection Recommendations

All identified substitute parts maintain active product status and ROHS3 compliance, meeting baseline regulatory and availability requirements.

Current Capacity Alignment: The AL8843SP-13 delivers 3A output current. Substitute parts range from 30mA to 1.2A. Selection must confirm that the substitute part's current capacity meets application requirements. TPS61160ADRVR and TPS61160DRVT provide the highest current capacity among substitutes at 700mA.

Supply Voltage Range: The AL8843SP-13 accepts 4.5V to 40V input. Substitute parts operate within narrower ranges (2.5V to 18V maximum). Applications requiring the full 40V input capability cannot use these substitutes without external voltage conditioning.

Temperature Operating Range: The AL8843SP-13 operates to 105°C. MIC3289-24YD6-TR extends to 125°C (TJ), while other substitutes are rated to 85°C. Applications requiring operation above 85°C should prioritize MIC3289-24YD6-TR or confirm thermal requirements against the AL8843SP-13's extended range.

Moisture Sensitivity: LM3553SDX/NOPB carries MSL 3 (168 hours), requiring controlled storage conditions. All other parts, including the AL8843SP-13, carry MSL 1 or 2, offering greater handling flexibility.

Dimming Control Method: The AL8843SP-13 supports analog and PWM dimming. LM3553SDX/NOPB uses I2C control, requiring firmware or microcontroller integration. PWM-capable substitutes (LM3530UME-40B/NOPB, LTC3202EDD#PBF, TPS61160ADRVR, TPS61160DRVT) align with PWM dimming requirements. MIC3289-24YD6-TR does not specify dimming capability.

Frequently Asked Questions (FAQ)

Q: Can I use a step-up (boost) topology substitute in place of the step-down (buck) AL8843SP-13?

A: Topology substitution depends on application voltage conversion requirements. Step-down topology reduces input voltage to a lower output level, while step-up topology increases input voltage to a higher output level. Substitution is valid only if the application's voltage conversion direction and magnitude align with the substitute part's topology. Verify input and output voltage specifications against application schematics.

Q: What is the significance of the AL8843SP-13's 40V maximum supply voltage compared to substitute parts?

A: The AL8843SP-13 accepts supply voltages up to 40V, enabling use in high-voltage applications. Most substitute parts limit input to 18V or lower. Applications requiring 40V input cannot use these substitutes without external voltage regulation or conditioning circuits.

Q: How does current capacity affect substitution?

A: The AL8843SP-13 provides 3A output current. Substitute parts range from 30mA to 1.2A. Current capacity must meet or exceed the application's LED load requirements. Undersized current capacity will result in thermal stress, reduced efficiency, or component failure. Verify the substitute part's current rating against the total LED string current draw.

Q: What is the impact of different dimming control methods?

A: The AL8843SP-13 supports analog and PWM dimming via direct pin control. LM3553SDX/NOPB uses I2C serial communication, requiring microcontroller integration. PWM-capable substitutes accept PWM signals directly. I2C-based control requires firmware development and microcontroller resources. Select a substitute with dimming control compatibility to the application's control architecture.

Q: Does package size affect substitution eligibility?

A: Yes. The AL8843SP-13 uses 8-SOIC packaging. Substitute parts employ different packages (12-DSBGA, 12-WSON, 10-DFN, TSOT-23-6, 6-WSON). Package differences affect PCB layout, thermal management, and assembly compatibility. Verify that the substitute part's package footprint and thermal characteristics are compatible with the existing PCB design or confirm redesign feasibility.

Q: Why is MIC3289-24YD6-TR rated to 125°C while others are 85°C?

A: MIC3289-24YD6-TR specifies operating temperature as -40°C to 125°C (TJ), where TJ represents junction temperature. Other parts specify -40°C to 85°C (TA), where TA represents ambient temperature. These are different measurement references. Verify the specific thermal requirements of your application and confirm that the substitute part's thermal rating meets those requirements under actual operating conditions.

Q: What does MSL (Moisture Sensitivity Level) mean for component handling?

A: MSL indicates the maximum time a component can be exposed to ambient humidity before requiring baking to remove absorbed moisture. MSL 1 (unlimited) allows indefinite storage without moisture concerns. MSL 3 (168 hours) requires baking if exposed to humidity for more than 168 hours. LM3553SDX/NOPB carries MSL 3, requiring controlled storage and handling procedures. All other parts carry MSL 1 or 2, offering greater handling flexibility.

Q: Can I substitute TPS61160ADRVR and TPS61160DRVT interchangeably?

A: TPS61160ADRVR and TPS61160DRVT are functionally identical with identical electrical specifications, frequency, dimming, and package. Both are active products with ROHS3 compliance. The difference lies in packaging format (Cut Tape & Digi-Reel vs. Cut Tape & Digi-Reel). Interchangeability depends on procurement and assembly requirements. Verify packaging compatibility with your supply chain and assembly process.