RT8456GE LED Driver IC Equivalent & Substitute Parts

Part Overview

The RT8456GE is an active linear LED driver IC manufactured by Richtek USA Inc., designed for single-output LED applications with linear dimming capability. This Surface Mount device operates across a wide supply voltage range of 4.75V to 48V and is packaged in SOT-23-6, making it suitable for compact lighting control circuits. The part is ROHS3 compliant and maintains active product status, ensuring continued availability and support. Equivalent and substitute parts are identified when design requirements necessitate alternative packaging, supply voltage ranges, output current specifications, or thermal operating conditions while maintaining functional compatibility for LED driver applications.

Substiute Parts

RT8456GE

Richtek USA Inc.In Stock: 1546RT8456GE Datasheet

Current PartRFQ

AL8400QSE-7

Diodes IncorporatedIn Stock: 15210AL8400QSE-7 Datasheet

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TL4242TDRJRQ1

Texas InstrumentsIn Stock: 35474TL4242TDRJRQ1 Datasheet

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TLD1120ELXUMA1

Infineon TechnologiesIn Stock: 1784TLD1120ELXUMA1 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RT8456GE are qualified based on the following critical parameters that determine functional interchangeability:

Primary Substitution Criteria:

• Single output LED driver topology with linear dimming capability
• Internal switch configuration (Yes/No) compatibility with circuit design
• Supply voltage range overlap or coverage of the application requirement
• Surface mount packaging suitable for PCB integration
• Operating temperature range meeting thermal specifications
• Active product status ensuring supply chain continuity
• ROHS3 compliance and REACH unaffected status for regulatory alignment

Substitute Parts Identified:

• TLD1120ELXUMA1 (Infineon Technologies): Automotive-grade linear LED driver with 360mA output, 5.5V–40V supply range, extended temperature to 150°C, 14-LSSOP package
• TL4242TDRJRQ1 (Texas Instruments): Automotive-grade linear LED driver with 500mA output, 4.5V–42V supply range, 8-SON package
• AL8400QSE-7 (Diodes Incorporated): Linear LED driver with 2.2V–18V supply range, automotive-grade, SOT-353 package, lower MSL rating

Parameter Comparison

Engineering Selection Recommendations

TLD1120ELXUMA1 (Infineon Technologies) is suitable for applications requiring extended operating temperature to 150°C and automotive-grade qualification (AEC-Q100). The 14-LSSOP package accommodates higher pin count requirements, and the 360mA output specification supports moderate LED current applications. Supply voltage range of 5.5V–40V covers most standard LED driver applications within the RT8456GE envelope.

TL4242TDRJRQ1 (Texas Instruments) provides the highest output current specification at 500mA with automotive-grade qualification (AEC-Q100). The 8-SON package offers compact footprint alternative to SOT-23-6. Supply voltage range of 4.5V–42V provides broad compatibility. Operating temperature limited to 105°C (TA) may restrict use in high-temperature environments compared to RT8456GE.

AL8400QSE-7 (Diodes Incorporated) is applicable for lower supply voltage applications (2.2V minimum) with automotive-grade qualification (AEC-Q100). The SOT-353 package provides ultra-compact form factor. MSL rating of 1 (Unlimited) offers superior moisture handling compared to RT8456GE MSL-3. However, maximum supply voltage of 18V restricts use in higher voltage applications.

All substitute parts maintain active product status, ROHS3 compliance, and REACH unaffected designation, ensuring regulatory and supply chain continuity.

Frequently Asked Questions (FAQ)

Q: Can AL8400QSE-7 replace RT8456GE in all applications? A: No. AL8400QSE-7 has a maximum supply voltage of 18V, while RT8456GE operates to 48V. Substitution is valid only for applications with supply voltage ≤18V. Additionally, AL8400QSE-7 lacks an internal switch, requiring external switching circuitry in some designs.

Q: What is the primary difference between TLD1120ELXUMA1 and TL4242TDRJRQ1? A: TLD1120ELXUMA1 offers extended operating temperature to 150°C and 360mA output current in a 14-LSSOP package. TL4242TDRJRQ1 provides higher output current at 500mA in a more compact 8-SON package but is limited to 105°C operating temperature. Selection depends on thermal requirements and output current specifications.

Q: Are all substitute parts automotive-qualified? A: Yes. TLD1120ELXUMA1, TL4242TDRJRQ1, and AL8400QSE-7 all carry AEC-Q100 automotive qualification. RT8456GE does not specify automotive qualification in the provided data.

Q: How does MSL rating affect part selection? A: MSL-3 (168 Hours) applies to RT8456GE, TLD1120ELXUMA1, and TL4242TDRJRQ1, requiring controlled moisture exposure during storage and handling. AL8400QSE-7 has MSL-1 (Unlimited), eliminating moisture sensitivity constraints and providing greater flexibility in supply chain management.

Q: Can package differences affect circuit board layout? A: Yes. RT8456GE uses SOT-23-6 (6-pin), while substitutes use different packages: TLD1120ELXUMA1 (14-LSSOP), TL4242TDRJRQ1 (8-SON), and AL8400QSE-7 (5-TSSOP/SOT-353). PCB layout, trace routing, and thermal management must be re-evaluated for each package type.

Q: What supply voltage range is common to all parts? A: The overlapping supply voltage range across all four parts is 5.5V–18V. For applications requiring operation above 18V, only RT8456GE, TLD1120ELXUMA1, and TL4242TDRJRQ1 are suitable.