RT8101GS Equivalent & Substitute Parts

Part Overview

The RT8101GS is a buck regulator positive output step-down DC-DC controller IC manufactured by Richtek USA Inc. in an 8-SOP package. This active product functions as a transistor driver for step-down voltage conversion with a single output phase and 100% maximum duty cycle. The device operates within a supply voltage range of 10.8V to 13.2V and switches at 300kHz with integrated synchronous rectification capability. Finding equivalent or substitute parts may be necessary due to inventory constraints, lead time requirements, or design flexibility needs while maintaining functional compatibility within specified electrical and mechanical parameters.

Substiute Parts

RT8101GS

Richtek USA Inc.In Stock: 2241RT8101GS Datasheet

Current PartRFQ

ISL6840IBZ-T

Renesas Electronics CorporationIn Stock: 4274ISL6840IBZ-T Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the RT8101GS is evaluated based on the following critical parameters that define functional and mechanical compatibility:

Mechanical Compatibility: Package type (8-SOIC with 0.154" width, 3.90mm) and mounting type (Surface Mount) must match to ensure PCB layout compatibility without redesign.

Electrical Compatibility: Output type (Transistor Driver), number of outputs (1), and output phases (1) establish the fundamental control architecture. Supply voltage range, switching frequency, duty cycle capability, and synchronous rectification presence determine operational suitability within the target application.

Regulatory & Environmental Compliance: RoHS3 compliance, MSL rating (3), operating temperature range, and REACH status ensure the substitute part meets the same regulatory and environmental requirements as the original component.

The ISL6840IBZ-T is identified as a substitute part based on shared mechanical packaging (8-SOIC), surface mount configuration, active product status, and equivalent regulatory compliance (RoHS3, MSL 3, REACH Unaffected). However, functional differences exist in topology (Boost/Flyback vs. Buck), supply voltage range, switching frequency capability, and duty cycle maximum, which must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

Both the RT8101GS and ISL6840IBZ-T maintain active product status with equivalent RoHS3 compliance and MSL 3 ratings, ensuring regulatory alignment and long-term availability. The identical 8-SOIC package footprint and surface mount configuration enable direct PCB placement compatibility without layout modification.

Selection between these parts must account for functional topology differences. The RT8101GS implements a buck (step-down) topology with 100% duty cycle capability and fixed 300kHz switching frequency. The ISL6840IBZ-T supports boost and flyback topologies with up to 2MHz switching frequency and 96% maximum duty cycle, operating across a wider supply voltage range (7.5V ~ 14V) compared to the RT8101GS (10.8V ~ 13.2V).

The ISL6840IBZ-T provides extended operating temperature range (-40°C ~ 105°C) relative to the RT8101GS (-40°C ~ 85°C), offering thermal margin for high-temperature applications. Both devices incorporate synchronous rectification and transistor driver output architecture.

Component selection must align with the specific DC-DC conversion topology required by the application circuit. Substitution is valid only when the target topology (buck, boost, or flyback) and electrical operating parameters match the application design.

Frequently Asked Questions (FAQ)

Q: Can the ISL6840IBZ-T directly replace the RT8101GS in a buck converter circuit?

A: Direct replacement is not recommended without circuit evaluation. While both devices share identical 8-SOIC packaging and surface mount configuration, the ISL6840IBZ-T is designed for boost and flyback topologies, whereas the RT8101GS is a buck controller. Topology mismatch requires circuit redesign and validation.

Q: What are the key mechanical compatibility factors between these parts?

A: Both parts use 8-SOIC packages with 0.154" width and 3.90mm dimensions, enabling identical PCB footprints. Surface mount configuration and pin count (8) are equivalent, allowing direct placement without layout modification.

Q: How do the supply voltage ranges differ between these controllers?

A: The RT8101GS operates within 10.8V to 13.2V, while the ISL6840IBZ-T accepts 7.5V to 14V. The ISL6840IBZ-T provides wider input voltage tolerance, though this advantage applies only when the application topology is compatible with boost or flyback operation.

Q: Are there regulatory or compliance differences between these parts?

A: Both parts are RoHS3 compliant, REACH unaffected, and carry MSL 3 ratings with 168-hour moisture sensitivity windows. Regulatory and environmental compliance are equivalent.

Q: What switching frequency differences exist between these controllers?

A: The RT8101GS operates at a fixed 300kHz switching frequency. The ISL6840IBZ-T supports switching frequencies up to 2MHz with frequency control capability, enabling higher frequency operation for applications requiring reduced component size or improved transient response.

Q: How do the maximum duty cycle specifications compare?

A: The RT8101GS supports 100% maximum duty cycle, enabling continuous conduction mode operation. The ISL6840IBZ-T is limited to 96% maximum duty cycle, which may affect minimum output voltage achievable in step-down applications.

Q: Which part is suitable for extended temperature range applications?

A: The ISL6840IBZ-T operates across -40°C to 105°C, providing 20°C additional upper temperature margin compared to the RT8101GS (-40°C to 85°C). Selection depends on application thermal requirements.