SC2442ITSTR Equivalent & Substitute Parts

Part Overview

The SC2442ITSTR 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

SC2442ITSTR

Semtech CorporationIn Stock: 805SC2442ITSTR Datasheet

Current PartRFQ

TPS43351QDAPRQ1

Texas InstrumentsIn Stock: 2988TPS43351QDAPRQ1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC2442ITSTR is based on 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 ~ 125°C minimum
• Supply voltage compatibility: Overlap within specified ranges

The TPS43351QDAPRQ1 from Texas Instruments meets these functional requirements while offering enhanced specifications and active product status.

Parameter Comparison

Engineering Selection Recommendations

The TPS43351QDAPRQ1 is the designated manufacturer-recommended substitute for the SC2442ITSTR. Selection of this alternative is justified by:

• Active product status with ongoing manufacturer support and availability
• Functional equivalence across all critical buck controller parameters
• Extended supply voltage range (4V ~ 40V vs. 4.75V ~ 30V) providing broader application compatibility
• Higher maximum duty cycle (98.75% vs. 94%) enabling greater output voltage flexibility
• AEC-Q100 automotive qualification and ROHS3 compliance for regulated applications
• Enhanced control features including power good output and tracking capability

Package transition from 24-TSSOP to 38-PowerTSSOP requires PCB layout modification. The wider package (6.10mm vs. 4.40mm) accommodates higher current handling capability inherent to the TPS43351QDAPRQ1 design.

Frequently Asked Questions (FAQ)

Q: Can the TPS43351QDAPRQ1 directly replace the SC2442ITSTR without design changes?

A: Functional substitution is possible, but package geometry differs. The TPS43351QDAPRQ1 uses a 38-PowerTSSOP package versus the 24-TSSOP of the original part. PCB footprint redesign is required. Pin-to-pin compatibility must be verified against detailed datasheets before implementation.

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

A: The SC2442ITSTR operates at a fixed 1.1MHz switching frequency. The TPS43351QDAPRQ1 provides programmable frequency control from 150kHz to 600kHz. This flexibility allows optimization for specific application requirements but requires frequency configuration during design implementation.

Q: Does the higher duty cycle of the TPS43351QDAPRQ1 affect compatibility?

A: The increased maximum duty cycle (98.75% vs. 94%) is a performance enhancement that expands the operating range. Existing designs operating within the 94% limit remain fully compatible. Applications requiring higher duty cycles benefit from this specification improvement.

Q: What are the implications of the different moisture sensitivity levels?

A: The SC2442ITSTR has MSL 1 (unlimited shelf life). The TPS43351QDAPRQ1 has MSL 3 (168-hour limit after moisture exposure). Storage and handling procedures must account for the reduced moisture tolerance window of the substitute part.

Q: Is the TPS43351QDAPRQ1 suitable for automotive applications?

A: Yes. The TPS43351QDAPRQ1 carries AEC-Q100 automotive qualification, making it appropriate for automotive-grade designs. The original SC2442ITSTR does not specify automotive qualification.

Q: How does the extended supply voltage range of the TPS43351QDAPRQ1 affect system design?

A: The broader input range (4V ~ 40V vs. 4.75V ~ 30V) provides greater flexibility for multi-voltage rail applications and improves compatibility with varying input source specifications. Existing designs operating within the original 4.75V ~ 30V window experience no adverse effects.