RT8458GJ6 Equivalent & Substitute Parts

Part Overview

The RT8458GJ6 is an LED Driver IC manufactured by Richtek USA Inc., designed for AC DC offline switching applications with step-down (buck) topology and analog dimming capability. This TSOT-23-6 surface mount component operates across a 17V to 32V supply range at 47kHz switching frequency. The part is currently in active production status with 1967 units available in inventory. Identifying equivalent and substitute parts is necessary to ensure design flexibility, manage supply chain continuity, and accommodate alternative sourcing requirements while maintaining functional compatibility.

Substiute Parts

RT8458GJ6

Richtek USA Inc.In Stock: 2050RT8458GJ6 Datasheet

Current PartRFQ

RT8458AGJ6

Richtek USA Inc.In Stock: 56124RT8458AGJ6 Datasheet

Parametric EquivalentRFQ

FL7701MX

Fairchild SemiconductorIn Stock: 5819FL7701MX Datasheet

SimilarRFQ

TPS92074DR

Texas InstrumentsIn Stock: 5370TPS92074DR Datasheet

SimilarRFQ

TS19730CX6 RFG

Taiwan Semiconductor CorporationIn Stock: 44327TS19730CX6 RFG Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the RT8458GJ6 are classified based on alignment with core functional parameters: AC DC offline switching topology, step-down (buck) conversion, single output configuration, analog dimming capability, and surface mount packaging. The primary substitution criterion is compatibility across the specified voltage supply range (17V to 32V minimum), switching frequency operation, and thermal operating range (-40°C to 125°C). Parts are grouped into parametric equivalents (identical or near-identical specifications) and similar alternatives (functionally equivalent but with variations in secondary parameters such as package type, frequency range, or supply voltage limits).

Key Parameters for Substitution:

• AC DC offline switcher topology
• Step-down (buck) conversion capability
• Single output configuration
• Analog dimming support
• Supply voltage range compatibility
• Operating temperature range
• Surface mount package type
• RoHS3 compliance

Parameter Comparison

Engineering Selection Recommendations

RT8458AGJ6 is the primary parametric equivalent to RT8458GJ6, manufactured by the same supplier (Richtek USA Inc.). Both parts share identical topology, frequency, dimming capability, and package configuration. The maximum supply voltage differs by 1V (31V vs. 32V), which represents negligible functional variance. Both parts maintain active production status and ROHS3 compliance. This part is preferred for direct substitution with highest inventory availability (56100 units).

FL7701MX (Fairchild Semiconductor) functions as a similar alternative with step-down (buck) topology and analog dimming. However, the supply voltage range (9V to 20V) does not fully encompass the RT8458GJ6 operating range (17V to 32V). The package differs (8-SOIC vs. TSOT-23-6), requiring PCB layout modification. This part is suitable only for applications operating within the 17V to 20V window.

TPS92074DR (Texas Instruments) provides step-down and step-up (boost) topology with a supply range of 11V to 18V, which partially overlaps the RT8458GJ6 range. The 8-SOIC package requires layout redesign. Dimming specification is not provided. This part is applicable only for designs operating within the 17V to 18V supply window.

TS19730CX6 RFG (Taiwan Semiconductor Corporation) is classified as obsolete and should not be selected for new designs. Although it supports the full supply voltage range (8V to 33V) and includes internal switching capability, its obsolete status and reduced operating temperature maximum (-40°C to 85°C vs. -40°C to 125°C) make it unsuitable for ongoing production applications.

For new designs and ongoing production, RT8458AGJ6 is the recommended substitute. For applications with constrained supply voltage requirements, FL7701MX or TPS92074DR may be evaluated within their respective voltage windows, contingent upon PCB layout modification and functional validation.

Frequently Asked Questions (FAQ)

Q: Can RT8458AGJ6 be used as a direct replacement for RT8458GJ6?

A: Yes. RT8458AGJ6 is a parametric equivalent with identical topology, frequency, dimming capability, and package configuration. The 1V difference in maximum supply voltage (31V vs. 32V) does not affect functional compatibility in standard applications. Both parts are manufactured by Richtek USA Inc. and maintain active production status.

Q: What is the primary difference between RT8458GJ6 and FL7701MX?

A: The primary differences are package type (TSOT-23-6 vs. 8-SOIC) and supply voltage range (17V-32V vs. 9V-20V). FL7701MX is suitable only for applications operating within the 17V to 20V window. Package substitution requires PCB redesign.

Q: Why is TS19730CX6 RFG not recommended as a substitute?

A: TS19730CX6 RFG is classified as obsolete and has a reduced maximum operating temperature (85°C vs. 125°C). New designs should not incorporate obsolete components. Existing designs using this part should transition to active alternatives.

Q: Can TPS92074DR replace RT8458GJ6 in all applications?

A: No. TPS92074DR has a maximum supply voltage of 18V, which does not cover the full RT8458GJ6 range (17V-32V). It is suitable only for applications operating within the 17V to 18V window. Additionally, the 8-SOIC package requires PCB layout modification compared to the TSOT-23-6 package.

Q: What packaging considerations apply when substituting with FL7701MX or TPS92074DR?

A: Both FL7701MX and TPS92074DR use 8-SOIC packaging, whereas RT8458GJ6 uses TSOT-23-6 packaging. Substitution requires PCB footprint redesign, trace routing modification, and thermal management re-evaluation. Pin-to-pin functional mapping must be verified against device datasheets.

Q: Are all substitute parts RoHS3 compliant?

A: RT8458AGJ6 and TPS92074DR are explicitly RoHS3 compliant. FL7701MX and TS19730CX6 RFG do not specify RoHS status in the provided data. Compliance verification should be obtained from manufacturer documentation before design implementation.

Q: What is the inventory status of substitute parts?

A: RT8458AGJ6 has the highest availability (56100 units). TS19730CX6 RFG has 44300 units, FL7701MX has 5753 units, and TPS92074DR has 5274 units. Inventory levels should be confirmed with suppliers for production planning.