SC2442HITSTR Equivalent & Substitute Parts

Part Overview

The SC2442HITSTR is a buck regulator positive output step-down DC-DC controller IC manufactured by Semtech Corporation in a 24-TSSOP package. This device functions as a transistor driver for step-down topology applications with dual output phases and integrated synchronous rectification. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.

Substiute Parts

SC2442HITSTR

Semtech CorporationIn Stock: 1003SC2442HITSTR Datasheet

Current PartRFQ

TPS43351QDAPRQ1

Texas InstrumentsIn Stock: 2988TPS43351QDAPRQ1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC2442HITSTR is determined by functional equivalence across the following critical parameters:

• Topology: Buck (step-down) configuration
• Output type: Transistor driver with dual-phase capability
• Output configuration: Positive output
• Synchronous rectification: Required
• Clock synchronization: Required
• Control features: Enable, frequency control, and soft start functionality
• Operating temperature range: -40°C to 125°C minimum
• Supply voltage compatibility: Overlap within specified input ranges

The TPS43351QDAPRQ1 from Texas Instruments meets these functional requirements as a buck regulator controller with dual-phase output, synchronous rectification, and clock sync capability. While package geometry differs (38-HTSSOP vs. 24-TSSOP), the electrical functionality and control interface remain compatible for circuit redesign applications.

Parameter Comparison

Engineering Selection Recommendations

The TPS43351QDAPRQ1 is qualified to AEC-Q100 automotive standards and maintains active product status, ensuring long-term availability and supply chain stability. The SC2442HITSTR obsolescence status necessitates migration to an active equivalent for new designs.

The TPS43351QDAPRQ1 provides extended supply voltage range (4V ~ 40V vs. 4.75V ~ 30V) and higher maximum duty cycle (98.75% vs. 94%), offering improved design flexibility. The addition of power good and tracking control features provides enhanced system monitoring capabilities beyond the original part.

Package redesign is required due to the transition from 24-TSSOP to 38-PowerTSSOP geometry. The increased pin count and package size accommodate additional control features and improved thermal performance.

Frequently Asked Questions (FAQ)

Q: Can the TPS43351QDAPRQ1 directly replace the SC2442HITSTR without circuit modification?

A: Direct pin-for-pin replacement is not possible due to different package geometries (24-TSSOP vs. 38-PowerTSSOP) and pin counts. Circuit board redesign is required. However, the functional control interface and dual-phase buck topology enable functional equivalence with appropriate PCB layout adaptation.

Q: What are the key compatibility factors for substitution?

A: Functional compatibility is established through matching topology (buck), output type (transistor driver), dual-phase capability, synchronous rectification, clock synchronization, and control feature set (enable, frequency control, soft start). Operating temperature range and supply voltage overlap confirm thermal and electrical compatibility.

Q: How does the package change affect circuit design?

A: The 38-PowerTSSOP package is larger (0.240" vs. 0.173" width) and contains additional pins. PCB layout must accommodate the new footprint, and thermal management may improve due to the larger package size. Pin assignment differences require schematic and layout review.

Q: Are there supply chain advantages to using the TPS43351QDAPRQ1?

A: Yes. The TPS43351QDAPRQ1 maintains active product status with 2904 units in stock, compared to the obsolete SC2442HITSTR. Active status ensures continued availability, technical support, and manufacturing consistency.

Q: What is the impact of the different switching frequency ranges?

A: The SC2442HITSTR operates at a fixed 1.1MHz switching frequency, while the TPS43351QDAPRQ1 provides a programmable range of 150kHz ~ 600kHz. This flexibility allows optimization for specific application requirements but requires frequency configuration during circuit design.