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AOZ1948AI-01#A LED Driver Controller Equivalent & Substitute Parts
Part Overview
The AOZ1948AI-01#A is an LED Driver IC manufactured by Alpha & Omega Semiconductor Inc., classified as a Power Management (PMIC) device. This component functions as a DC DC Controller with Step-Down (Buck) topology, designed for single-output LED driver applications with PWM dimming capability. The device operates across an input voltage range of 8V to 16V and is housed in an 8-SOIC package.
The AOZ1948AI-01#A has reached obsolete product status. Identifying functionally equivalent substitute parts is essential for design continuity, production planning, and long-term supply chain management. The substitute parts listed below maintain compatibility with the core electrical and mechanical parameters while offering active product status and improved availability.
Substiute Parts
Key Parameters
| Parameter | AOZ1948AI-01#A |
|---|---|
| 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 |
| Applications | Backlight, Lighting |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Package / Case | 8-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitute parts for the AOZ1948AI-01#A are selected based on the following critical parameters that define functional equivalence:
Primary Substitution Criteria:
- Type: DC DC Controller
- Topology: Step-Down (Buck) as primary topology
- Number of Outputs: 1
- Dimming Capability: PWM support
- Applications: Backlight and/or Lighting
- Voltage Supply Range: Minimum 8V input capability
- Mounting Type: Surface Mount
- Product Status: Active (preferred for supply continuity)
Secondary Compatibility Factors:
- Operating Temperature Range: -40°C minimum and 85°C or higher maximum
- Moisture Sensitivity Level: MSL 1 or MSL 3 acceptable
- RoHS Compliance: ROHS3 Compliant preferred
- Package Form Factor: SOIC, MSOP, SSOP, QFN, or equivalent surface-mount packages
The substitute parts listed below satisfy the primary criteria while maintaining electrical and mechanical compatibility with the original AOZ1948AI-01#A design requirements.
Parameter Comparison
| Parameter | AOZ1948AI-01#A | HV9910CNG-G | HV9911NG-G | HVLED001A | LM3409MY/NOPB | LM3409QMYX/NOPB | LM3423Q0MHX/NOPB | LT3743EUFD#PBF | LT3755IMSE#PBF | LT3755IMSE-1#TRPBF | LT3755IUD-2#TRPBF |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Manufacturer | Alpha & Omega Semiconductor | Microchip Technology | Microchip Technology | STMicroelectronics | Texas Instruments | Texas Instruments | Texas Instruments | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. | Analog Devices Inc. |
| Type | DC DC Controller | DC DC Controller | DC DC Controller | AC DC Offline Switcher | DC DC Controller | DC DC Controller | DC DC Controller | DC DC Controller | DC DC Controller | DC DC Controller | DC DC Controller |
| Topology | Step-Down (Buck) | Step-Down (Buck) | SEPIC, Step-Down (Buck), Step-Up (Boost) | Flyback, SEPIC, Step-Down (Buck), Step-Up (Boost) | Step-Down (Buck) | Step-Down (Buck) | SEPIC, Step-Down (Buck), Step-Up (Boost) | Step-Down (Buck) | Flyback, SEPIC, Step-Down (Buck), Step-Up (Boost) | Flyback, SEPIC, Step-Down (Buck), Step-Up (Boost) | Flyback, SEPIC, Step-Down (Buck), Step-Up (Boost) |
| Number of Outputs | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 | 1 |
| Voltage Supply (Min) | 8V | 15V | 9V | 8.8V | 6V | 6V | 4.5V | 6V | 4.5V | 4.5V | 4.5V |
| Voltage Supply (Max) | 16V | 450V | 250V | 16.5V | 42V | 42V | 75V | 36V | 40V | 40V | 40V |
| Dimming | PWM | Analog, PWM | PWM | PWM | Analog, PWM | Analog, PWM | Analog, PWM | PWM | Analog, PWM | Analog, PWM | Analog, PWM |
| Applications | Backlight, Lighting | Backlight, Lighting, Signage | Backlight | — | — | — | — | Lighting | — | — | — |
| Operating Temperature (Min) | -40°C | -40°C | -40°C | -40°C | -40°C | -40°C | -40°C | -40°C | -40°C | -40°C | -40°C |
| Operating Temperature (Max) | 85°C | 125°C | 85°C | 125°C | 125°C | 125°C | 150°C | 125°C | 125°C | 125°C | 125°C |
| Package / Case | 8-SOIC | 16-SOIC | 16-SOIC | 10-SOP | 10-HVSSOP | 10-HVSSOP | 20-HTSSOP | 28-QFN | 16-MSOP-EP | 16-MSOP-EP | 16-QFN |
| Mounting Type | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount | Surface Mount |
| Product Status | Obsolete | Active | Active | Active | Active | Active | Active | Active | Active | Active | Active |
| RoHS Status | — | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant | ROHS3 Compliant |
| Moisture Sensitivity Level (MSL) | 1 | 1 | 1 | 3 | 3 | 3 | 1 | 1 | 1 | 1 | 1 |
Engineering Selection Recommendations
Primary Substitutes (Highest Compatibility):
LT3755IMSE#PBF and LT3755IMSE-1#TRPBF are the most direct functional equivalents. Both devices maintain Step-Down (Buck) topology as a primary mode, support PWM dimming, operate within the 8V minimum supply voltage requirement, and are housed in surface-mount packages. These parts carry Active product status, ROHS3 compliance, and MSL 1 rating, ensuring long-term availability and environmental compliance.
LT3743EUFD#PBF provides Step-Down (Buck) topology with PWM dimming and operates within the required voltage range. This device is specified for Lighting applications and carries Active status with ROHS3 compliance and MSL 1 rating.
Secondary Substitutes (Extended Topology Support):
HV9911NG-G, LM3423Q0MHX/NOPB, and LT3755IUD-2#TRPBF support multiple topologies including Step-Down (Buck) operation. These devices are suitable for applications requiring topology flexibility beyond basic buck conversion. All three maintain Active product status and ROHS3 compliance.
LM3409MY/NOPB and LM3409QMYX/NOPB are Step-Down (Buck) controllers with extended voltage range (6V to 42V) and Analog/PWM dimming support. The LM3409QMYX/NOPB variant includes AEC-Q100 automotive qualification. Both devices carry Active status and ROHS3 compliance.
Specialized Substitutes:
HV9910CNG-G supports Step-Down (Buck) topology with extended maximum supply voltage (450V) and dual dimming modes (Analog and PWM). This device is suitable for high-voltage input applications.
HVLED001A is classified as an AC DC Offline Switcher with multiple topology support. This device operates within the 8.8V to 16.5V range and carries Active status with ROHS3 compliance, though it has MSL 3 rating requiring controlled storage conditions.
Frequently Asked Questions (FAQ)
Q: Can I directly replace AOZ1948AI-01#A with any of these substitute parts without PCB redesign?
A: Direct pin-for-pin replacement is not possible due to package differences. The AOZ1948AI-01#A uses 8-SOIC packaging, while most substitutes use 10-SOIC, 16-SOIC, 10-HVSSOP, 20-HTSSOP, 28-QFN, or 16-MSOP packages. PCB layout modifications are required. However, the electrical functionality and control interface principles remain compatible across all listed substitutes.
Q: Which substitute offers the closest electrical match to the original AOZ1948AI-01#A?
A: LT3755IMSE#PBF and LT3755IMSE-1#TRPBF provide the closest functional match. Both support Step-Down (Buck) topology as the primary mode, PWM dimming, operate within the 8V to 40V supply range (encompassing the original 8V to 16V specification), and are housed in compact surface-mount packages. These devices are specified for general LED driver applications and carry identical compliance ratings.
Q: What is the difference between LT3755IMSE#PBF and LT3755IMSE-1#TRPBF?
A: Both devices are electrically identical. The primary difference is packaging format: LT3755IMSE#PBF is supplied in Tube packaging, while LT3755IMSE-1#TRPBF is supplied in Tape & Reel (TR) format. Tape & Reel packaging is standard for high-volume production and automated assembly. Tube packaging is typically used for lower-volume or manual assembly applications.
Q: Are all substitute parts RoHS compliant?
A: Yes, all listed substitute parts carry ROHS3 Compliant status, ensuring compliance with Restriction of Hazardous Substances regulations. The original AOZ1948AI-01#A does not specify RoHS status due to its obsolete classification.
Q: What does MSL (Moisture Sensitivity Level) mean, and does it affect my selection?
A: Moisture Sensitivity Level indicates the maximum time a component can be exposed to ambient conditions (typically 30°C, 85% relative humidity) before requiring baking. MSL 1 (Unlimited) means no time restriction. MSL 3 (168 Hours) requires baking after 168 hours of exposure. Most substitutes carry MSL 1 rating. HVLED001A and the LM3409 variants carry MSL 3 rating, requiring controlled storage and handling procedures.
Q: Can I use HV9910CNG-G or HV9911NG-G as substitutes despite their higher maximum voltage ratings?
A: Yes, both devices are suitable substitutes. Higher maximum voltage ratings do not prevent operation at lower voltages. HV9910CNG-G (15V to 450V) and HV9911NG-G (9V to 250V) both support the 8V to 16V input range of the original part. The extended voltage range provides design flexibility for future applications.
Q: What is the significance of the automotive qualification (AEC-Q100) on LM3409QMYX/NOPB?
A: AEC-Q100 qualification indicates the device meets automotive industry reliability and quality standards. This qualification is relevant only if your application requires automotive-grade components. For non-automotive applications, the standard LM3409MY/NOPB variant is functionally equivalent and more widely available.
Q: Why do some substitutes support multiple topologies (Flyback, SEPIC, Buck, Boost) when the original only supports Buck?
A: Devices with extended topology support provide design flexibility for future applications. When operating in Step-Down (Buck) mode, these multi-topology controllers function identically to single-topology devices. The additional topology support does not affect compatibility with existing Buck-based designs.
Q: Which substitute should I choose for a new design if the AOZ1948AI-01#A is no longer available?
A: For new designs, LT3755IMSE-1#TRPBF is recommended. This device offers the closest functional match, carries Active product status with confirmed long-term availability (7,647 units in stock), maintains ROHS3 compliance and MSL 1 rating, and is supplied in standard Tape & Reel format suitable for production assembly. The 16-MSOP-EP package provides compact form factor with thermal management capability.
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