AOZ1948AI#A LED Driver Controller - Equivalent & Substitute Parts

Part Overview

The AOZ1948AI#A is an LED Driver IC manufactured by Alpha & Omega Semiconductor Inc., designed as a DC-DC controller with Step-Down (Buck) topology for LED backlight and lighting applications. This part operates with PWM dimming control and is housed in an 8-SOIC package. The device is currently classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Substiute Parts

AOZ1948AI#A

Alpha & Omega Semiconductor Inc.In Stock: 778AOZ1948AI#A Datasheet

Current PartRFQ

HV9910BNG-G-M901

Microchip TechnologyIn Stock: 2471HV9910BNG-G-M901 Datasheet

MFR RecommendedRFQ

HVLED002

STMicroelectronicsIn Stock: 983HVLED002 Datasheet

MFR RecommendedRFQ

LT3743EFE#PBF

Analog Devices Inc.In Stock: 2606LT3743EFE#PBF Datasheet

MFR RecommendedRFQ

LT3743EUFD#TRPBF

Analog Devices Inc.In Stock: 3356LT3743EUFD#TRPBF Datasheet

MFR RecommendedRFQ

LT3761AEMSE#PBF

Linear TechnologyIn Stock: 4300LT3761AEMSE#PBF Datasheet

MFR RecommendedRFQ

MP24894GJ-P

Monolithic Power Systems Inc.In Stock: 1970MP24894GJ-P Datasheet

MFR RecommendedRFQ

RT8494GS

Richtek USA Inc.In Stock: 1045RT8494GS Datasheet

MFR RecommendedRFQ

TPS92640PWPT/NOPB

Texas InstrumentsIn Stock: 1841TPS92640PWPT/NOPB Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

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

• Topology: Step-Down (Buck) DC-DC controller architecture
• Dimming Control: PWM capability for LED brightness adjustment
• Voltage Supply Range: Minimum 8V input compatibility
• Package Compatibility: 8-SOIC form factor preferred for direct PCB replacement
• Output Configuration: Single output channel
• Application Domain: LED driver for backlight and lighting systems
• Operating Temperature: Support for -40°C to 85°C minimum range

Substitute parts are grouped into two categories based on package compatibility and feature alignment:

Category 1 - Direct Package Compatibility (8-SOIC): HVLED002 maintains the original 8-SOIC package footprint, enabling direct PCB replacement with minimal layout modifications.

Category 2 - Enhanced Feature Set with Alternative Packages: HV9910BNG-G-M901, LT3743EFE#PBF, LT3743EUFD#TRPBF, LT3761AEMSE#PBF, MP24894GJ-P, RT8494GS, and TPS92640PWPT/NOPB offer expanded voltage ranges, higher operating temperatures, or additional dimming modes while maintaining Step-Down (Buck) topology and PWM control.

Parameter Comparison

Engineering Selection Recommendations

HVLED002 (STMicroelectronics) is the primary direct replacement candidate. It maintains the 8-SOIC package footprint for seamless PCB integration and operates within the required voltage range (7V to 25V). The device is active and ROHS3 compliant. The higher operating temperature range (-40°C to 150°C) provides thermal margin beyond the original specification. MSL 3 rating requires controlled storage conditions during handling.

HV9910BNG-G-M901 (Microchip Technology) offers expanded voltage capability (8V to 450V) and dual dimming modes (Analog and PWM). Active product status and ROHS3 compliance support long-term availability. The 16-SOIC package requires PCB layout modification. Frequency options (25kHz, 100kHz) provide design flexibility.

LT3743EFE#PBF and LT3743EUFD#TRPBF (Analog Devices Inc.) are functionally identical with different packaging (28-TSSOP-EP and 28-QFN respectively). Both are active, ROHS3 compliant, and support PWM dimming across a 6V to 36V input range. Extended frequency range (200kHz to 1MHz) enables optimized inductor selection. Package changes require significant PCB redesign.

LT3761AEMSE#PBF (Linear Technology) is obsolete and RoHS non-compliant, limiting suitability for new designs despite its multi-topology capability (Flyback, SEPIC, Buck, Boost).

MP24894GJ-P (Monolithic Power Systems Inc.) provides compact TSOT-23-6 packaging with automotive-grade qualification. Active status and ROHS3 compliance ensure availability. The 6V to 60V input range and 1MHz frequency support high-density applications.

RT8494GS (Richtek USA Inc.) combines Step-Down and Step-Up topologies with automotive AEC-Q100 qualification. Active status and ROHS3 compliance are confirmed. MSL 3 rating requires controlled storage. The 14-SOIC package is intermediate between the original 8-SOIC and larger alternatives.

TPS92640PWPT/NOPB (Texas Instruments) is automotive-grade with AEC-Q100 qualification and supports 7V to 85V input range. Active status and ROHS3 compliance ensure long-term support. The 14-PowerTSSOP package requires layout modification.

Frequently Asked Questions (FAQ)

Q: Can HVLED002 be used as a direct drop-in replacement for AOZ1948AI#A?

A: HVLED002 maintains the 8-SOIC package footprint and operates within compatible voltage ranges (7V to 25V vs. 8V to 16V). No PCB layout changes are required. However, verify dimming control implementation, as HVLED002 topology and dimming specifications are not fully detailed in the datasheet parameters provided.

Q: What is the primary difference between LT3743EFE#PBF and LT3743EUFD#TRPBF?

A: Both devices are functionally identical with identical electrical specifications. The difference is packaging: LT3743EFE#PBF uses 28-TSSOP-EP (Tube packaging), while LT3743EUFD#TRPBF uses 28-QFN (Tape & Reel). Select based on assembly equipment compatibility and tape reel availability requirements.

Q: Why is HV9910BNG-G-M901 rated for 450V maximum supply voltage when the original part is only 16V?

A: HV9910BNG-G-M901 is a more versatile controller designed for high-voltage LED string applications. The 450V rating does not require operation at that level; the device operates safely at the original 8V to 16V range. The expanded range provides design flexibility for future applications.

Q: Are all substitute parts ROHS3 compliant?

A: Most active substitutes are ROHS3 compliant (HVLED002, HV9910BNG-G-M901, LT3743EFE#PBF, LT3743EUFD#TRPBF, MP24894GJ-P, RT8494GS, TPS92640PWPT/NOPB). LT3761AEMSE#PBF is RoHS non-compliant and obsolete, making it unsuitable for new designs.

Q: What is the significance of MSL (Moisture Sensitivity Level) ratings?

A: MSL 1 (Unlimited) parts have no moisture-related storage restrictions. MSL 3 (168 Hours) parts require controlled humidity storage and must be baked before reflow soldering if exposed to ambient humidity for extended periods. HVLED002 and RT8494GS carry MSL 3 ratings and require proper handling protocols.

Q: Which substitute offers the smallest package footprint?

A: MP24894GJ-P uses SOT-23-6 packaging, the smallest form factor among substitutes. This enables high-density PCB layouts but requires verification of thermal performance and current handling capacity for your specific application.

Q: Can I use TPS92640PWPT/NOPB in automotive applications?

A: Yes. TPS92640PWPT/NOPB carries automotive-grade qualification and AEC-Q100 certification, making it suitable for automotive lighting systems. Verify compliance with your specific automotive standards and temperature requirements.

Q: What frequency range should I select for my design?

A: The original AOZ1948AI#A does not specify frequency. Substitute parts offer ranges from 25kHz (HV9910BNG-G-M901) to 1MHz (LT3743 series, MP24894GJ-P, TPS92640PWPT/NOPB). Higher frequencies reduce inductor size but increase switching losses. Select based on your power supply design requirements and PCB space constraints.