AOZ1083CI#A LED Driver IC Equivalent & Substitute Parts

Part Overview

The AOZ1083CI#A is a LED Driver IC manufactured by Alpha & Omega Semiconductor Inc., classified as a Power Management (PMIC) device. This component functions as a 1-output DC-DC regulator with step-down (buck) topology, PWM dimming capability, and 1.2A output current rating. The device operates across a 3V to 26V supply voltage range and is housed in a SOT-23-6 surface mount package.

The AOZ1083CI#A is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements for applications utilizing this LED driver topology.

Key Parameters

Parameter	AOZ1083CI#A Value
Manufacturer	Alpha & Omega Semiconductor Inc.
Category	Power Management (PMIC)
Type	DC DC Regulator
Topology	Step-Down (Buck)
Internal Switch(s)	Yes
Number of Outputs	1
Voltage - Supply (Min)	3V
Voltage - Supply (Max)	26V
Current - Output / Channel	1.2A
Frequency	1.5MHz
Dimming	PWM
Applications	Lighting
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	SOT-23-6
Product Status	Obsolete
Series	EZBuck™
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the AOZ1083CI#A are grouped based on strict alignment with the following critical electrical and mechanical parameters:

Primary Substitution Criteria:

Topology: Step-Down (Buck) configuration with internal switch
Dimming Method: PWM capability
Output Configuration: Single output
Supply Voltage Range: Minimum 3V to 26V maximum (or compatible overlap)
Output Current: 1.2A or higher rating
Package Type: Surface mount with compatible pinout
Operating Temperature: -40°C to 85°C or extended range

Secondary Compatibility Factors:

Frequency operation in the 1MHz to 1.5MHz range
Lighting application suitability
Active or equivalent product status preferred over obsolete

Substitutes are identified where electrical performance parameters align with the AOZ1083CI#A requirements, ensuring functional equivalence in LED driver applications. Package differences are noted where they occur, as physical compatibility may require PCB layout modifications.

Parameter Comparison

Parameter	AOZ1083CI#A	A6213KLJTR-T	IS31LT3353-SDLS4-TR	IS31LT3353-V1STLS2-TR	LED2001PHR	LM3402MM/NOPB	LM3404HVMA/NOPB	LM3406HVMH/NOPB
Topology	Step-Down (Buck)	Step-Down (Buck)	Step-Down (Buck)	Step-Down (Buck)	Step-Down (Buck)	Step-Down (Buck)	Step-Down (Buck)	Step-Down (Buck)
Voltage - Supply (Min)	3V	6V	6V	6V	3V	6V	6V	6V
Voltage - Supply (Max)	26V	48V	40V	40V	18V	42V	75V	75V
Current - Output / Channel	1.2A	3A	1A	1A	4A	500mA	1A	1.5A
Frequency	1.5MHz	—	1MHz	1MHz	850kHz	1MHz	1MHz	10kHz ~ 1MHz
Dimming	PWM	PWM	Analog, PWM	Analog, PWM	PWM	PWM	PWM	PWM
Operating Temperature	-40°C ~ 85°C (TA)	-40°C ~ 125°C (TA)	-40°C ~ 125°C (TA)	-40°C ~ 125°C (TA)	-40°C ~ 150°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)	-40°C ~ 125°C (TJ)
Package / Case	SOT-23-6	8-SOIC (0.154", 3.90mm Width) Exposed Pad	SOT-89-5/6	SC-74A, SOT-753	8-SOIC (0.154", 3.90mm Width) Exposed Pad	8-TSSOP, 8-MSOP (0.118", 3.00mm Width)	8-SOIC (0.154", 3.90mm Width)	14-PowerTSSOP (0.173", 4.40mm Width)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active
RoHS Status	—	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	3 (168 Hours)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Primary Substitutes (Active Status, Closest Electrical Match):

IS31LT3353-V1STLS2-TR and IS31LT3353-SDLS4-TR represent the most direct functional equivalents. Both devices maintain step-down buck topology with 1A output current capability, PWM dimming, and 1MHz switching frequency. The IS31LT3353-V1STLS2-TR is packaged in SOT-23-5, offering the smallest form factor closest to the original SOT-23-6. Both variants are ROHS3 compliant and actively produced, ensuring long-term supply availability.

Secondary Substitutes (Higher Current Capability):

LED2001PHR, LM3404HVMA/NOPB, and LM3406HVMH/NOPB provide increased output current ratings (4A, 1A, and 1.5A respectively) while maintaining step-down buck topology and PWM dimming. These devices are suitable for applications requiring higher current delivery or thermal margin. All three are ROHS3 compliant and actively produced. LM3404HVMA/NOPB and LM3406HVMH/NOPB carry automotive-grade qualification (AEC-Q100 or equivalent), providing additional reliability assurance.

Lower Current Alternative:

LM3402MM/NOPB operates at 500mA output current, suitable only for applications with reduced current requirements. This device maintains PWM dimming and step-down topology but represents a downgrade in current capacity.

Package Considerations:

All recommended substitutes require PCB layout modifications due to package differences from the original SOT-23-6. IS31LT3353-V1STLS2-TR (SOT-23-5) requires minimal layout changes. Larger packages (8-SOIC, SOT-89-5, 14-HTSSOP) necessitate more substantial PCB redesign.

Compliance Status:

All active substitute candidates are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements. The original AOZ1083CI#A product status is obsolete; substitution is necessary for new production.

Frequently Asked Questions (FAQ)

Q: Can IS31LT3353-V1STLS2-TR directly replace AOZ1083CI#A without PCB modification?

A: No. While both are SOT-23 packages, IS31LT3353-V1STLS2-TR uses SOT-23-5 pinout versus AOZ1083CI#A's SOT-23-6. Pin assignments differ, requiring schematic and PCB layout changes. Verify pinout compatibility before implementation.

Q: What is the primary reason to substitute the AOZ1083CI#A?

A: The AOZ1083CI#A is obsolete. Active production has ceased, making long-term supply unavailable. Substitution ensures design continuity and supports ongoing manufacturing requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All recommended active substitutes (IS31LT3353 variants, LED2001PHR, LM3402MM/NOPB, LM3404HVMA/NOPB, LM3406HVMH/NOPB) are ROHS3 compliant. The original AOZ1083CI#A compliance status is not specified in available data.

Q: Which substitute offers the closest electrical performance match?

A: IS31LT3353-V1STLS2-TR and IS31LT3353-SDLS4-TR provide the closest functional equivalence, maintaining 1A output current, PWM dimming, 1MHz switching frequency, and step-down buck topology. Both support lighting applications and operate across -40°C to 125°C temperature range.

Q: Can I use LED2001PHR as a direct substitute?

A: LED2001PHR is functionally compatible but not a direct replacement. It provides 4A output current (versus 1.2A), operates at 850kHz (versus 1.5MHz), and uses 8-HSOP package (versus SOT-23-6). These differences require circuit redesign and PCB layout modification. Use only if higher current capability is acceptable for your application.

Q: What is the supply voltage compatibility range for substitutes?

A: AOZ1083CI#A operates 3V to 26V. Most substitutes operate 6V minimum, reducing lower-voltage compatibility. IS31LT3353 variants and LED2001PHR maintain 3V minimum supply voltage, preserving full voltage range compatibility. Verify your application's supply voltage requirements before selection.

Q: Are automotive-grade substitutes available?

A: Yes. LM3404HVMA/NOPB and LM3406HVMH/NOPB carry automotive qualification. These devices are suitable for automotive lighting applications requiring AEC-Q100 compliance.

Q: What package considerations apply to substitution?

A: All substitutes use different packages than SOT-23-6. IS31LT3353-V1STLS2-TR (SOT-23-5) requires minimal layout changes. Larger packages (8-SOIC, SOT-89-5, 14-HTSSOP) require substantial PCB redesign. Evaluate board space and thermal requirements before package selection.

Q: Is frequency matching critical for substitution?

A: Frequency differences (850kHz to 1.5MHz range) are acceptable for most lighting applications. However, verify EMI performance and filtering requirements in your specific design. Frequency changes may affect component selection for input/output filtering networks.

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