RT8482GQW LED Driver Controller - Equivalent & Substitute Parts

Part Overview

The RT8482GQW is a LED Driver IC manufactured by Richtek USA Inc., designed as a 1-output DC DC controller supporting both step-down (buck) and step-up (boost) topologies. It operates with analog and PWM dimming capabilities in a 16-WQFN (3x3) surface mount package. The device is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. Alternative parts must maintain functional compatibility across power management topology, dimming control, and thermal operating range.

Substiute Parts

RT8482GQW

Richtek USA Inc.In Stock: 2711RT8482GQW Datasheet

Current PartRFQ

RT8452GQW

Richtek USA Inc.In Stock: 18556RT8452GQW Datasheet

Parametric EquivalentRFQ

BD8381AEFV-ME2

Rohm SemiconductorIn Stock: 3625BD8381AEFV-ME2 Datasheet

SimilarRFQ

BD8381EFV-ME2

ROHM SemiconductorIn Stock: 1866BD8381EFV-ME2 Datasheet

SimilarRFQ

BD9489F-GE2

ROHM SemiconductorIn Stock: 4005BD9489F-GE2 Datasheet

SimilarRFQ

LM3424QMHX/NOPB

Texas InstrumentsIn Stock: 7527LM3424QMHX/NOPB Datasheet

SimilarRFQ

LT3756EUD-2#PBF

Analog Devices Inc.In Stock: 20465LT3756EUD-2#PBF Datasheet

SimilarRFQ

LT3922EUFD#TRPBF

Analog Devices Inc.In Stock: 3878LT3922EUFD#TRPBF Datasheet

SimilarRFQ

TPS92641PWP/NOPB

Texas InstrumentsIn Stock: 1967TPS92641PWP/NOPB Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the RT8482GQW is determined by the following critical parameters:

Primary Substitution Criteria:

• DC DC controller topology (step-down, step-up, or both)
• Input voltage supply range compatibility (minimum 4.5V, maximum 36V or higher)
• Dimming control method (analog, PWM, or both)
• Operating temperature range (-40°C to 125°C or wider)
• Surface mount package with compatible pinout and thermal characteristics
• RoHS3 compliance and MSL rating

Parametric Equivalent: RT8452GQW maintains identical electrical specifications and package format, with active product status and higher inventory availability.

Similar Alternatives: BD8381AEFV-ME2, BD8381EFV-ME2, BD9489F-GE2, LM3424QMHX/NOPB, LT3756EUD-2#PBF, and LT3922EUFD#TRPBF provide functional substitution with topology variations and different package formats. These parts accommodate the same application space (backlight and lighting) with compatible voltage ranges and dimming capabilities.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: RT8452GQW

The RT8452GQW is the direct parametric equivalent to the RT8482GQW. It maintains identical electrical specifications, package format, and thermal characteristics while offering active product status and significantly higher inventory availability (18,535 units in stock versus 2,700 for the obsolete RT8482GQW). This part requires no design modifications and provides the most straightforward migration path.

Secondary Recommendations for Topology-Specific Applications:

For applications requiring boost-only topology with extended frequency range, LT3922EUFD#TRPBF (Analog Devices Inc.) provides active status with lower minimum supply voltage (2.8V) and higher maximum frequency (2MHz). This part is suitable for lighting applications with automotive-grade qualification.

For applications requiring multi-topology support with extended input voltage range (up to 100V), LT3756EUD-2#PBF (Analog Devices Inc.) offers flyback, SEPIC, buck, and boost configurations in a compatible 16-QFN package with active product status.

For buck-only applications requiring high input voltage tolerance (up to 85V), TPS92641PWP/NOPB (Texas Instruments) provides automotive-grade qualification with active status.

Parts to Avoid for New Designs:

BD8381EFV-ME2 and BD9489F-GE2 carry "Not For New Designs" status and should not be selected for new development projects.

All recommended alternatives maintain RoHS3 compliance and appropriate MSL ratings for surface mount assembly.

Frequently Asked Questions (FAQ)

Q: Can RT8452GQW directly replace RT8482GQW without PCB modifications?

A: Yes. RT8452GQW is a parametric equivalent with identical supply voltage range (4.5V-36V), output voltage (48V), switching frequency (350kHz), dimming control (analog and PWM), operating temperature range (-40°C to 125°C), and package format (16-WQFN 3x3). No design changes are required.

Q: What is the key difference between RT8482GQW and the ROHM alternatives (BD8381 series)?

A: The BD8381 series uses a different package format (28-HTSSOP-B versus 16-WQFN), operates at a lower maximum supply voltage (30V versus 36V), and supports PWM dimming only (no analog dimming). These differences require PCB redesign and are suitable only for applications with lower input voltage requirements.

Q: Why does BD9489F-GE2 have a lower maximum operating temperature (85°C versus 125°C)?

A: BD9489F-GE2 is specified with a maximum ambient temperature (TA) of 85°C, whereas RT8482GQW is specified with a maximum junction temperature (TJ) of 125°C. This represents a more restrictive thermal specification and may limit performance in high-temperature environments.

Q: Are all substitute parts automotive-qualified?

A: Not all. LM3424QMHX/NOPB, LT3922EUFD#TRPBF, and TPS92641PWP/NOPB carry automotive-grade qualification. BD8381AEFV-ME2 and BD8381EFV-ME2 also carry automotive grade. RT8452GQW and LT3756EUD-2#PBF do not specify automotive qualification in the provided data.

Q: What is the MSL (Moisture Sensitivity Level) difference between parts?

A: RT8482GQW, RT8452GQW, BD8381AEFV-ME2, and BD8381EFV-ME2 are rated MSL 3 (168 hours). LM3424QMHX/NOPB, LT3756EUD-2#PBF, LT3922EUFD#TRPBF, and TPS92641PWP/NOPB are rated MSL 1 (unlimited). MSL 1 parts have less stringent moisture handling requirements during storage and assembly.

Q: Can LT3756EUD-2#PBF be used in place of RT8482GQW for boost-only applications?

A: Yes, with design considerations. LT3756EUD-2#PBF supports boost topology with a wider input voltage range (6V-100V) and higher frequency capability (100kHz-1MHz). However, it uses a different package (16-QFN 3x3 versus 16-WQFN 3x3) and may require PCB layout adjustments. The part is suitable for lighting applications with active product status.

Q: What is the inventory status for each recommended part?

A: RT8452GQW has 18,535 units in stock. LM3424QMHX/NOPB has 7,515 units. LT3756EUD-2#PBF has 20,400 units. LT3922EUFD#TRPBF has 3,777 units. TPS92641PWP/NOPB has 1,928 units. All are available as new original stock.