AOZ1081AI LED Driver IC Equivalent & Substitute Parts

Part Overview

The AOZ1081AI is an LED Driver IC from Alpha & Omega Semiconductor Inc., classified as a Power Management (PMIC) component. This device functions as a DC DC Regulator with Step-Down (Buck) topology, delivering 1.8A output current with PWM dimming capability at 1MHz frequency. The part is designated as Obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	AOZ1081AI
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Step-Down (Buck)
Internal Switch(s)	Yes
Number of Outputs	1
Voltage - Supply (Min)	4.5V
Voltage - Supply (Max)	16V
Current - Output / Channel	1.8A
Frequency	1MHz
Dimming	PWM
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	8-SOIC (0.154", 3.90mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the AOZ1081AI is determined by the following critical parameters:

Topology: Step-Down (Buck) configuration with internal switch
Output Current: Minimum 1.8A capability
Supply Voltage Range: Compatibility with 4.5V to 16V input (or wider range)
Dimming Method: PWM dimming support
Package Compatibility: 8-pin surface mount packages (8-SOIC, 8-MSOP, 8-DSO variants acceptable)
Frequency: Operation at or near 1MHz
Temperature Range: Support for -40°C to 85°C minimum

Substitute parts are grouped into two categories:

Category A - Direct Pin/Package Compatible (8-SOIC/8-DSO packages): Parts maintaining 8-pin SOIC or DSO package footprints with equivalent or superior electrical specifications.

Category B - Functional Equivalents (Alternative packages): Parts with superior specifications but different package formats, requiring PCB layout modification.

Parameter Comparison

Parameter	AOZ1081AI	ILD6150XUMA1	ILD4071XUMA1	LED2000DR	LM3404HVMR/NOPB	LM3406HVQMHQ1
Manufacturer	Alpha & Omega	Infineon	Infineon	STMicroelectronics	Texas Instruments	Texas Instruments
Topology	Step-Down (Buck)	Step-Down (Buck)	Step-Down (Buck)	Step-Down (Buck)	Step-Down (Buck)	Step-Down (Buck)
Supply Voltage Min	4.5V	4.5V	5V	3V	6V	6V
Supply Voltage Max	16V	60V	40V	18V	75V	75V
Output Current	1.8A	1.5A	700mA	3A	1A	1.5A
Frequency	1MHz	1MHz	50kHz ~ 300kHz	850kHz	1MHz	10kHz ~ 1MHz
Dimming	PWM	Analog, PWM	PWM	PWM	PWM	PWM
Operating Temperature	-40°C ~ 85°C	-40°C ~ 150°C	-40°C ~ 125°C	-40°C ~ 150°C	-40°C ~ 125°C	-40°C ~ 150°C
Package	8-SOIC	8-SOIC	8-SOIC	8-SOIC	8-PowerSOIC	14-HTSSOP
Product Status	Obsolete	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute - ILD6150XUMA1 (Infineon Technologies)

The ILD6150XUMA1 provides the closest functional match to the AOZ1081AI. Both devices operate at 1MHz with PWM dimming, maintain 8-SOIC package compatibility, and support the 4.5V minimum supply voltage. The ILD6150XUMA1 delivers 1.5A output current against the AOZ1081AI's 1.8A specification; however, this represents a 17% reduction suitable for applications where current demand does not exceed 1.5A. The ILD6150XUMA1 extends the maximum supply voltage to 60V and operating temperature to 150°C, providing enhanced design margin. Product status is Active with full ROHS3 compliance.

Secondary Substitute - LED2000DR (STMicroelectronics)

The LED2000DR exceeds the AOZ1081AI specification with 3A output current and maintains 8-SOIC package compatibility. Operating frequency is 850kHz, slightly below the 1MHz reference. Supply voltage range spans 3V to 18V, encompassing the AOZ1081AI's 4.5V to 16V window. Operating temperature extends to 150°C. This device is suitable for applications requiring higher current capacity within the same package footprint. Product status is Active with ROHS3 compliance.

Tertiary Substitute - LM3406HVQMHQ1 (Texas Instruments)

The LM3406HVQMHQ1 delivers 1.5A output current with PWM dimming across a 10kHz to 1MHz frequency range, accommodating the AOZ1081AI's 1MHz operation point. Supply voltage tolerance extends to 75V maximum. The device transitions to a 14-HTSSOP package, requiring PCB layout modification. Operating temperature reaches 150°C. Automotive qualification (AEC-Q100) is included. Product status is Active with ROHS3 compliance.

Alternative Substitute - LM3405AXMKX/NOPB (Texas Instruments)

The LM3405AXMKX/NOPB provides 1A output current in a compact SOT-23-6 package, representing a 44% current reduction from the AOZ1081AI. Frequency operation reaches 1.6MHz. Supply voltage range spans 3V to 22V. This option is applicable only to designs where output current requirements are ≤1A and space constraints favor miniaturization. Product status is Active with ROHS3 compliance.

Frequently Asked Questions (FAQ)

Q: Can the ILD6150XUMA1 directly replace the AOZ1081AI without PCB modification?

A: Yes. Both devices use 8-SOIC package format with identical pin spacing (0.154", 3.90mm width). Pin-to-pin compatibility requires verification of the specific pinout diagram, as internal switch configuration and control signal routing may differ. Consult device datasheets for detailed pin assignments before implementation.

Q: What is the impact of using a 1.5A device (ILD6150XUMA1) in an application designed for 1.8A (AOZ1081AI)?

A: The 1.5A output current represents the maximum continuous switch current. Applications drawing sustained current above 1.5A will experience thermal stress and potential shutdown. Verify actual application current demand; many LED driver designs operate below rated maximum. Thermal management and current limiting must be re-evaluated.

Q: Why does the LED2000DR have higher output current (3A) than the AOZ1081AI (1.8A)?

A: The LED2000DR incorporates enhanced internal switch design and thermal management within the 8-SOIC package. Higher current capability does not mandate higher current draw; the device operates safely at reduced current levels. This provides design flexibility for future current scaling without package change.

Q: Is the LM3406HVQMHQ1 suitable as a substitute despite the different package (14-HTSSOP vs. 8-SOIC)?

A: Package change requires complete PCB layout redesign. The LM3406HVQMHQ1 is functionally equivalent with superior specifications (1.5A, 75V supply, 150°C operation, AEC-Q100 automotive qualification). This substitution is justified only when PCB redesign is feasible and automotive-grade reliability is required.

Q: What is the significance of the "Obsolete" product status for the AOZ1081AI?

A: Obsolete status indicates the manufacturer has discontinued production and support. Existing inventory may be available through authorized distributors, but long-term supply is not guaranteed. Substitution planning is necessary for designs requiring production beyond current stock availability.

Q: Are all substitute parts ROHS3 compliant like the AOZ1081AI?

A: Yes. All substitute parts listed maintain ROHS3 compliance, ensuring compatibility with environmental and regulatory requirements equivalent to the original device.

Q: Can the LM3405AXMKX/NOPB be used in high-current applications?

A: No. The LM3405AXMKX/NOPB is rated for 1A maximum output current, representing a 44% reduction from the AOZ1081AI's 1.8A specification. This device is applicable only to applications with current requirements ≤1A. The compact SOT-23-6 package prioritizes space efficiency over current capacity.

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