ISL6123IR Equivalent & Substitute Parts

Part Overview

The ISL6123IR is a Power Supply Sequencer manufactured by Renesas Electronics Corporation, designed for 24-QFN (4x4) surface mount applications. This component functions as a power supply controller with integrated sequencing capabilities for multi-rail power distribution systems. The ISL6123IR is classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations where legacy compatibility is not required.

Substiute Parts

ISL6123IR

Renesas Electronics CorporationIn Stock: 1218ISL6123IR Datasheet

Current PartRFQ

SG1548J-DESC

Microchip TechnologyIn Stock: 920SG1548J-DESC Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution analysis for the ISL6123IR is based on functional category alignment and core electrical operating parameters. The primary substitute identified is the SG1548J-DESC from Microchip Technology, classified as a Power Supply Monitor within the Power Management (PMIC) category.

Substitution logic is determined by the following criteria:

• Functional category: Both components operate within power supply control and monitoring applications
• Supply voltage range compatibility: The ISL6123IR operates at 1.5V ~ 5.5V, while the SG1548J-DESC operates at 4.5V ~ 35V, establishing a partial overlap in the 4.5V ~ 5.5V range
• Current consumption profile: ISL6123IR at 200 µA versus SG1548J-DESC at 4.8 mA represents a significant operational difference
• Mounting and packaging: ISL6123IR uses surface mount (24-VFQFN), while SG1548J-DESC uses through-hole (16-CDIP), indicating different PCB integration requirements
• Product status and compliance: ISL6123IR is obsolete; SG1548J-DESC is active, providing ongoing availability and support

Parameter Comparison

Engineering Selection Recommendations

Selection between the ISL6123IR and SG1548J-DESC must account for the following factors based on provided specifications:

Product Status Consideration: The ISL6123IR is obsolete, limiting future availability and manufacturer support. The SG1548J-DESC maintains active status, ensuring continued supply chain access and technical documentation availability.

Compliance Alignment: Both components share identical RoHS non-compliance and REACH Unaffected status, presenting no differentiation on regulatory grounds.

Operational Parameter Differences: The SG1548J-DESC exhibits higher supply current consumption (4.8 mA versus 200 µA) and operates across a wider supply voltage range (4.5V ~ 35V versus 1.5V ~ 5.5V). These differences require circuit-level evaluation to determine functional equivalence within specific application contexts.

Packaging and Integration: The transition from surface mount (24-VFQFN) to through-hole (16-CDIP) represents a significant PCB layout change, necessitating redesign of the component footprint and associated routing.

Frequently Asked Questions (FAQ)

Q: Can the SG1548J-DESC directly replace the ISL6123IR in existing designs?

A: Direct replacement is not supported without circuit redesign. The SG1548J-DESC operates at higher supply current (4.8 mA versus 200 µA) and requires through-hole mounting versus surface mount. Functional equivalence must be established through application-specific analysis.

Q: What is the primary reason for seeking alternatives to the ISL6123IR?

A: The ISL6123IR is classified as obsolete, making it unavailable for new production orders and limiting long-term supply chain reliability. Active alternatives such as the SG1548J-DESC provide ongoing manufacturer support and availability.

Q: Are there voltage range compatibility concerns between these components?

A: The ISL6123IR operates at 1.5V ~ 5.5V, while the SG1548J-DESC operates at 4.5V ~ 35V. Compatibility exists only within the 4.5V ~ 5.5V overlap range. Applications requiring operation below 4.5V cannot use the SG1548J-DESC as a substitute.

Q: How do the packaging differences affect substitution feasibility?

A: The ISL6123IR uses 24-VFQFN surface mount packaging, while the SG1548J-DESC uses 16-CDIP through-hole packaging. These are fundamentally different integration methods requiring PCB redesign, component placement changes, and routing modifications.

Q: What compliance certifications apply to both components?

A: Both the ISL6123IR and SG1548J-DESC are RoHS non-compliant and REACH Unaffected. No differentiation exists on these regulatory parameters.