RT8496GS LED Driver Controller - Equivalent & Substitute Parts

Part Overview

The RT8496GS is an active LED driver controller IC manufactured by Richtek USA Inc., designed for step-down (buck) and step-up (boost) topologies with analog and PWM dimming capabilities. This device operates across a 4.5V to 36V supply range and delivers 150V output, making it suitable for backlight and lighting applications. The part is ROHS3 compliant and currently in active production with 1198 units in stock. Equivalent and substitute parts are identified when design requirements necessitate alternative packaging, thermal performance, supply voltage ranges, or frequency characteristics while maintaining functional compatibility in LED driver applications.

Substiute Parts

RT8496GS

Richtek USA Inc.In Stock: 1232RT8496GS Datasheet

Current PartRFQ

RT8485GS

Richtek USA Inc.In Stock: 1205RT8485GS Datasheet

Parametric EquivalentRFQ

BD8381AEFV-ME2

Rohm SemiconductorIn Stock: 3625BD8381AEFV-ME2 Datasheet

SimilarRFQ

LT3756EUD-2#PBF

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

SimilarRFQ

LT3761EMSE#PBF

Analog Devices Inc.In Stock: 3004LT3761EMSE#PBF Datasheet

SimilarRFQ

LT3791EFE#PBF

Analog Devices Inc.In Stock: 2337LT3791EFE#PBF Datasheet

SimilarRFQ

LT8391AEUFD#PBF

Analog Devices Inc.In Stock: 884LT8391AEUFD#PBF Datasheet

SimilarRFQ

LT8391AHFE#PBF

Analog Devices Inc.In Stock: 829LT8391AHFE#PBF Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the RT8496GS is determined by the following critical parameters: DC DC controller topology (step-down/step-up capability), single output configuration, supply voltage range compatibility (minimum 4.5V, maximum 36V or higher), output voltage capability (150V or higher), dimming method support (analog and/or PWM), surface mount packaging, and operating temperature range (-40°C to 125°C or wider). Parts are grouped as parametric equivalents when all electrical specifications align with the main part, and as similar alternatives when topology, dimming, or packaging differs but functional application compatibility is maintained for LED driver circuits.

Parameter Comparison

Engineering Selection Recommendations

RT8485GS is the parametric equivalent to RT8496GS, offering identical supply voltage range (4.5V to 36V), 150V output capability, dual dimming support (analog and PWM), and matching 14-SOIC package. Both parts are ROHS3 compliant with MSL-3 ratings and active production status. Selection between these two Richtek devices depends on frequency requirements; RT8485GS specifies 100kHz to 1MHz operation.

BD8381AEFV-ME2 from Rohm Semiconductor maintains step-down/step-up topology and PWM dimming but operates at 5V to 30V supply range with 300kHz fixed frequency. This part is packaged in 28-VSSOP and carries automotive grade qualification, suitable for applications requiring higher pin count and automotive compliance.

LT3756EUD-2#PBF and LT3761EMSE#PBF from Analog Devices expand topology support to include Flyback and SEPIC configurations. LT3756EUD-2#PBF operates at 6V to 100V supply range in 16-QFN package with MSL-1 rating. LT3761EMSE#PBF covers 4.5V to 60V in 16-MSOP package, also MSL-1 rated. Both support analog and PWM dimming across 100kHz to 1MHz frequency range.

LT3791EFE#PBF provides step-down/step-up topology with 4.7V to 60V supply range and 0V to 60V output in 38-TSSOP package. This part operates at 200kHz to 700kHz with MSL-1 rating and is designated for lighting applications.

LT8391AEUFD#PBF and LT8391AHFE#PBF are automotive-grade alternatives with extended frequency capability (600kHz to 2MHz), 4V to 60V supply range, and 60V output. LT8391AEUFD#PBF uses 28-QFN packaging while LT8391AHFE#PBF uses 28-TSSOP. LT8391AHFE#PBF extends operating temperature to -40°C to 150°C. Both carry MSL-1 ratings and automotive qualification.

All substitute parts maintain active production status and ROHS3 compliance, ensuring long-term availability and regulatory alignment with the RT8496GS.

Frequently Asked Questions (FAQ)

Q: Can RT8485GS directly replace RT8496GS in existing designs?

A: Yes. RT8485GS is a parametric equivalent with identical supply voltage range (4.5V to 36V), 150V output, dual dimming modes (analog and PWM), and 14-SOIC package. Both parts are ROHS3 compliant and MSL-3 rated. The primary difference is RT8485GS specifies operating frequency of 100kHz to 1MHz, whereas RT8496GS does not specify frequency. PCB layout and component values remain compatible.

Q: What are the key differences between Richtek and Analog Devices LED driver controllers in this list?

A: Richtek parts (RT8496GS, RT8485GS) are optimized for 4.5V to 36V supply range with 150V output capability and MSL-3 moisture sensitivity. Analog Devices parts (LT3756, LT3761, LT3791, LT8391 series) extend supply voltage to 60V or 100V, offer MSL-1 ratings for moisture-sensitive environments, and include automotive-grade variants. Analog Devices parts also support additional topologies (Flyback, SEPIC) beyond buck/boost.

Q: When should I select a part with higher supply voltage range than RT8496GS?

A: Select LT3756EUD-2#PBF (6V to 100V), LT3761EMSE#PBF (4.5V to 60V), or LT8391 series (4V to 60V) when input supply exceeds 36V or when design flexibility for future voltage scaling is required. These parts maintain step-down/step-up topology and dimming support while accommodating wider input ranges.

Q: What packaging options are available as alternatives to the 14-SOIC of RT8496GS?

A: BD8381AEFV-ME2 offers 28-VSSOP with higher pin count. LT3756EUD-2#PBF provides 16-QFN (3x3). LT3761EMSE#PBF uses 16-MSOP. LT3791EFE#PBF is available in 38-TSSOP. LT8391AEUFD#PBF uses 28-QFN (4x5), and LT8391AHFE#PBF uses 28-TSSOP. Package selection depends on PCB space constraints and thermal management requirements.

Q: Are automotive-grade parts available as substitutes?

A: Yes. BD8381AEFV-ME2 from Rohm Semiconductor carries automotive grade. LT8391AEUFD#PBF and LT8391AHFE#PBF from Analog Devices are automotive-qualified with extended temperature range (-40°C to 150°C for LT8391AHFE#PBF). These parts are suitable for automotive lighting and high-reliability applications.

Q: What is the moisture sensitivity difference between RT8496GS and Analog Devices alternatives?

A: RT8496GS and RT8485GS are MSL-3 rated (168 hours maximum floor life). Analog Devices parts (LT3756, LT3761, LT3791, LT8391 series) are MSL-1 rated (unlimited floor life). MSL-1 parts require less stringent moisture control during storage and assembly, reducing handling complexity in high-volume manufacturing.

Q: Can I use LT3791EFE#PBF if my application requires 150V output like RT8496GS?

A: No. LT3791EFE#PBF is specified for 0V to 60V output, which is insufficient for 150V applications. Retain RT8496GS, RT8485GS, or select LT8391 series (60V output) only if your actual output voltage requirement is 60V or lower. Verify output voltage specification against application requirements before substitution.

Q: What frequency considerations apply when selecting a substitute?

A: RT8496GS does not specify operating frequency. RT8485GS operates at 100kHz to 1MHz. LT3756 and LT3761 operate at 100kHz to 1MHz. LT3791 operates at 200kHz to 700kHz. LT8391 series operates at 600kHz to 2MHz. Higher frequency operation reduces inductor and capacitor size but increases switching losses. Select frequency range based on power stage design and EMI requirements.