SC2442H Equivalent & Substitute Parts

Part Overview

The SC2442H 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 SC2442H is classified as obsolete, making identification of compatible substitute components essential for ongoing design support and procurement continuity.

Substiute Parts

SC2442H

Semtech CorporationIn Stock: 1108SC2442H Datasheet

Current PartRFQ

TPS43351QDAPRQ1

Texas InstrumentsIn Stock: 2988TPS43351QDAPRQ1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC2442H is determined by alignment of core electrical and mechanical parameters that define functional equivalence in buck regulator controller applications. The primary substitution criteria are:

Electrical Compatibility Parameters:

• Output type: Transistor driver for step-down topology
• Output configuration: Positive output
• Number of outputs and phases: Dual output, dual phase capability
• Supply voltage range: Must encompass or exceed the 4.75V ~ 30V range
• Synchronous rectification support: Required
• Clock synchronization capability: Required
• Control feature set: Must include Enable, Frequency Control, and Soft Start functions
• Operating temperature range: Must support -40°C ~ 125°C (TJ)

Mechanical Compatibility Parameters:

• Mounting type: Surface mount
• Package form factor: Pin count and physical dimensions must accommodate PCB layout constraints

The TPS43351QDAPRQ1 from Texas Instruments meets these substitution criteria through functional equivalence in topology, control architecture, and thermal operating range, while offering enhanced supply voltage range and duty cycle capability.

Parameter Comparison

Engineering Selection Recommendations

The TPS43351QDAPRQ1 is the manufacturer-recommended substitute for the obsolete SC2442H. Selection of this alternative is supported by the following engineering factors:

Product Status and Availability: The SC2442H is classified as obsolete, whereas the TPS43351QDAPRQ1 maintains active product status with documented inventory availability. This ensures long-term supply chain continuity and access to technical support.

Compliance and Qualification: The TPS43351QDAPRQ1 carries AEC-Q100 automotive qualification and is manufactured to ROHS3 compliance standards, providing enhanced reliability documentation for regulated applications. The SC2442H carries no specified automotive qualification.

Functional Equivalence: Both devices operate as dual-phase, positive-output buck regulator controllers with synchronous rectification and clock synchronization. The TPS43351QDAPRQ1 extends the supply voltage range to 4V ~ 40V and increases maximum duty cycle to 98.75%, providing design margin for applications previously constrained by the SC2442H specifications.

Package Consideration: The TPS43351QDAPRQ1 uses a 38-PowerTSSOP package versus the 24-TSSOP of the SC2442H. PCB layout redesign is required to accommodate the larger package footprint and increased pin count.

Frequently Asked Questions (FAQ)

Q: Can the TPS43351QDAPRQ1 directly replace the SC2442H without PCB modification?

A: No. The TPS43351QDAPRQ1 uses a 38-PowerTSSOP package with different pin assignments compared to the 24-TSSOP package of the SC2442H. PCB layout redesign is mandatory. Pin-to-pin compatibility does not exist between these devices.

Q: What are the key electrical differences between these controllers?

A: The TPS43351QDAPRQ1 offers extended supply voltage range (4V ~ 40V versus 4.75V ~ 30V), higher maximum duty cycle (98.75% versus 94%), and adjustable switching frequency (150kHz ~ 600kHz versus fixed 1.1MHz). Both maintain identical output phase count, synchronous rectification, and thermal operating range.

Q: Is the TPS43351QDAPRQ1 suitable for automotive applications?

A: Yes. The TPS43351QDAPRQ1 carries AEC-Q100 qualification and automotive-grade designation. The SC2442H does not specify automotive qualification.

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

A: The SC2442H operates at a fixed 1.1MHz switching frequency. The TPS43351QDAPRQ1 provides adjustable frequency control within the 150kHz ~ 600kHz range. This flexibility allows optimization of component selection and thermal performance for specific application requirements.

Q: Are there moisture sensitivity differences between these parts?

A: Yes. The SC2442H has MSL 1 (unlimited moisture exposure tolerance), while the TPS43351QDAPRQ1 has MSL 3 (168-hour moisture exposure limit). The TPS43351QDAPRQ1 requires controlled storage and handling procedures to maintain moisture sensitivity specifications.

Q: Why is the TPS43351QDAPRQ1 recommended as the official substitute?

A: The TPS43351QDAPRQ1 is the manufacturer-recommended substitute due to functional equivalence in core buck regulator controller topology, active product status ensuring supply continuity, enhanced compliance certifications, and extended electrical performance specifications that provide design margin for modern applications.