AOZ1948AI LED Driver Controller - Equivalent & Substitute Parts

Part Overview

The AOZ1948AI is an LED Driver IC manufactured by Alpha & Omega Semiconductor Inc., classified as a Power Management (PMIC) device. This single-output DC-DC controller implements a step-down (buck) topology with PWM dimming capability, designed for backlight and lighting applications. The device operates across a supply voltage range of 8V to 16V and is housed in an 8-SOIC package.

The AOZ1948AI is currently listed as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or maintenance of systems utilizing this component.

Key Parameters

Parameter	AOZ1948AI Value
Manufacturer	Alpha & Omega Semiconductor Inc.
Category	Power Management (PMIC)
Type	DC DC Controller
Topology	Step-Down (Buck)
Number of Outputs	1
Voltage - Supply (Min)	8V
Voltage - Supply (Max)	16V
Dimming	PWM
Package / Case	8-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Operating Temperature	-40°C ~ 85°C (TA)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
MSL	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the AOZ1948AI is determined by the following critical parameters:

Topology: Step-Down (Buck) configuration
Number of Outputs: Single output
Supply Voltage Range: Minimum 8V input capability
Dimming Method: PWM dimming support
Package Compatibility: 8-SOIC form factor preferred for direct PCB replacement
Internal Switch Configuration: No internal switch
Product Status: Active alternatives required due to obsolescence

Substitute parts are grouped into two categories:

Category 1 - Direct Package Replacement (8-SOIC): IRS25411STRPBF and LM3401MM/NOPB maintain the same 8-SOIC package footprint, enabling direct PCB substitution with minimal layout modifications.

Category 2 - Functional Equivalents (Alternative Packages): HV9961NG-G-M901, LM3409MYX/NOPB, LT3743EFE#TRPBF, LT3756EMSE#TRPBF, LTC3783EDHD#TRPBF, and MAX1698EUB+ provide equivalent or enhanced functionality with different package configurations, requiring PCB redesign or adapter solutions.

Category 3 - Extended Capability Devices: TPS92640PWPR/NOPB and LT3756EMSE#TRPBF support multiple topologies beyond step-down, offering design flexibility for future applications.

Parameter Comparison

Part Number	Manufacturer	Type	Topology	Outputs	Supply Min (V)	Supply Max (V)	Dimming	Package	Temp Range (°C)	Status
AOZ1948AI	Alpha & Omega	DC DC Controller	Step-Down (Buck)	1	8	16	PWM	8-SOIC	-40 ~ 85	Obsolete
IRS25411STRPBF	Infineon	DC DC Controller	Step-Down (Buck)	1	8	16.6	PWM	8-SOIC	-25 ~ 125	Active
LM3401MM/NOPB	Texas Instruments	DC DC Controller	Step-Down (Buck)	1	4.5	35	PWM	8-VSSOP	-40 ~ 125	Active
HV9961NG-G-M901	Microchip	DC DC Controller	Step-Down (Buck)	1	8	450	Analog, PWM	16-SOIC	-40 ~ 125	Active
LM3409MYX/NOPB	Texas Instruments	DC DC Controller	Step-Down (Buck)	1	6	42	Analog, PWM	10-HVSSOP	-40 ~ 125	Active
LT3743EFE#TRPBF	Analog Devices	DC DC Controller	Step-Down (Buck)	1	6	36	PWM	28-TSSOP-EP	-40 ~ 125	Active
LT3756EMSE#TRPBF	Analog Devices	DC DC Controller	Flyback, SEPIC, Buck, Boost	1	6	100	Analog, PWM	16-MSOP-EP	-40 ~ 125	Active
LTC3783EDHD#TRPBF	Analog Devices	DC DC Controller	Flyback, SEPIC, Buck, Boost	1	3	36	Analog, PWM	16-DFN (5x4)	-40 ~ 125	Active
MAX1698EUB+	Analog Devices/Maxim	DC DC Controller	Step-Up (Boost)	1	2.7	5.5	—	10-uMAX/uSOP	-40 ~ 85	Active
TPS92640PWPR/NOPB	Texas Instruments	DC DC Controller	Step-Down (Buck)	1	7	85	Analog, PWM	14-HTSSOP	-40 ~ 125	Active

Engineering Selection Recommendations

For Direct Replacement (Preferred)

IRS25411STRPBF is the closest functional equivalent. It maintains the 8-SOIC package, operates within the 8V to 16.6V supply range, and provides PWM dimming. The device is manufactured by Infineon Technologies, an established supplier with active product status. Operating temperature extends to 125°C (junction), exceeding the AOZ1948AI specification. RoHS3 compliance and MSL-2 rating ensure regulatory and environmental compatibility.

LM3401MM/NOPB offers broader supply voltage tolerance (4.5V to 35V) and extended operating temperature (-40°C to 125°C). While the package differs (8-VSSOP versus 8-SOIC), both are 8-pin surface-mount configurations with similar footprints. Texas Instruments maintains active production status with established supply chain availability.

For Enhanced Capability Applications

HV9961NG-G-M901 supports extended supply voltage (8V to 450V) and dual dimming modes (Analog and PWM), enabling broader application scope. The 16-SOIC package requires PCB layout modification but provides additional control flexibility.

TPS92640PWPR/NOPB extends supply voltage to 85V with automotive-grade qualification, suitable for applications requiring higher input voltage tolerance or automotive compliance.

For Multi-Topology Flexibility

LT3756EMSE#TRPBF and LTC3783EDHD#TRPBF support multiple topologies (Flyback, SEPIC, Buck, Boost), enabling design migration to alternative power conversion architectures. These devices are recommended only when application requirements justify topology flexibility beyond step-down operation.

Compliance and Certification

All recommended substitutes maintain ROHS3 compliance and REACH unaffected status, matching the AOZ1948AI regulatory profile. All devices carry EAR99 ECCN classification and identical HTSUS codes (8542.39.0001), ensuring consistent tariff treatment and export compliance.

Frequently Asked Questions (FAQ)

Q: Can IRS25411STRPBF directly replace AOZ1948AI on existing PCBs?

A: Yes. Both devices use 8-SOIC packaging with identical pin spacing (0.154", 3.90mm width). Pin-to-pin compatibility requires verification against device datasheets, but the physical footprint enables direct PCB substitution without layout modification.

Q: What is the key difference between LM3401MM/NOPB and IRS25411STRPBF?

A: LM3401MM/NOPB uses 8-VSSOP packaging (0.118", 3.00mm width) versus IRS25411STRPBF's 8-SOIC (0.154", 3.90mm width). LM3401MM/NOPB supports broader supply voltage (4.5V to 35V) and higher switching frequency (1.5MHz). IRS25411STRPBF maintains closer voltage matching to AOZ1948AI (8V to 16.6V) and operates at 500kHz.

Q: Why is MAX1698EUB+ listed as a substitute if it uses boost topology instead of buck?

A: MAX1698EUB+ is included because it appears in the AOZ1948AI's documented substitute list. However, it implements step-up (boost) topology, fundamentally different from the step-down (buck) architecture. This device is suitable only for applications where input voltage is lower than required output voltage, not as a direct functional replacement.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the AOZ1948AI specification. MSL ratings vary (1 to 3), with MSL-1 devices offering unlimited shelf life and MSL-3 devices requiring controlled storage (168 hours maximum).

Q: Which substitute supports the widest supply voltage range?

A: HV9961NG-G-M901 supports 8V to 450V input, the broadest range among all substitutes. This extended range enables application in higher-voltage systems but requires careful circuit design to manage voltage stress on external components.

Q: Can LT3756EMSE#TRPBF or LTC3783EDHD#TRPBF be used in place of AOZ1948AI?

A: Both devices support step-down (buck) topology and are functionally capable of replacing AOZ1948AI. However, they offer multi-topology capability (Flyback, SEPIC, Boost) and require different package footprints (16-MSOP-EP and 16-DFN respectively). PCB redesign is necessary. These devices are recommended only when additional topology flexibility justifies redesign effort.

Q: What is the operating temperature advantage of substitute parts?

A: Most substitutes extend maximum operating temperature to 125°C (junction or ambient), compared to AOZ1948AI's 85°C (ambient). This provides improved thermal margin in high-temperature environments. IRS25411STRPBF and LM3401MM/NOPB both support -40°C to 125°C range, matching or exceeding AOZ1948AI specifications.

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