SC401BMLTRT Equivalent & Substitute Parts

Part Overview

The SC401BMLTRT is a buck switching regulator IC from Semtech Corporation's EcoSpeed® series, designed for positive adjustable step-down voltage regulation with a 15A output capacity. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The part operates across a 3V to 17V input range with adjustable output from 0.6V to 5.5V, featuring synchronous rectification and a 1MHz switching frequency in a 32-WFQFN exposed pad package.

Substiute Parts

SC401BMLTRT

Semtech CorporationIn Stock: 2985SC401BMLTRT Datasheet

Current PartRFQ

TPS548B22RVFR

Texas InstrumentsIn Stock: 35316TPS548B22RVFR Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC401BMLTRT is determined by the following critical parameters:

• Topology & Function: Buck switching regulator with step-down positive adjustable output
• Output Voltage Range: 0.6V to 5.5V adjustable
• Input Voltage Range: Minimum 3V to maximum 17V
• Output Current Capacity: 15A minimum requirement
• Synchronous Rectification: Required for efficiency
• Operating Temperature Range: -40°C to 125°C
• Package Compatibility: Surface mount with exposed pad design

The TPS548B22RVFR meets these substitution criteria with enhanced specifications in output current (25A) and input voltage range (1.5V to 18V), while maintaining compatibility across all critical functional parameters.

Parameter Comparison

Engineering Selection Recommendations

The TPS548B22RVFR is a qualified substitute for the obsolete SC401BMLTRT based on the following engineering criteria:

Functional Equivalence: Both devices implement identical buck topology with positive adjustable output configuration, single output, and synchronous rectification across matching voltage ranges (0.6V to 5.5V output, 3V to 17V input minimum).

Performance Enhancement: The TPS548B22RVFR provides superior specifications with 25A output current capacity versus 15A, and extended input voltage range (1.5V minimum versus 3V), offering design margin and flexibility for future applications.

Compliance Status: The TPS548B22RVFR maintains active product status with ROHS3 compliance and REACH affected designation, ensuring long-term availability and regulatory alignment. The SC401BMLTRT's obsolete status necessitates transition to this active alternative.

Package Consideration: The TPS548B22RVFR uses a 40-PowerLFQFN package versus the SC401BMLTRT's 32-WFQFN package. PCB layout redesign is required for this substitution.

Frequently Asked Questions (FAQ)

Q: Can the TPS548B22RVFR directly replace the SC401BMLTRT without PCB modifications?

A: No. The TPS548B22RVFR uses a 40-PowerLFQFN package while the SC401BMLTRT uses a 32-WFQFN package. PCB footprint redesign is mandatory. Pin configuration and functional pinout must be verified against respective datasheets before layout implementation.

Q: What are the key substitution criteria for this buck regulator?

A: Substitution is valid when the alternative part maintains: buck topology, positive adjustable output (0.6V to 5.5V), single output configuration, input voltage range covering 3V to 17V, minimum 15A output current, synchronous rectification, and -40°C to 125°C operating temperature range.

Q: Why is the TPS548B22RVFR rated for 25A output when the original is 15A?

A: The TPS548B22RVFR is a higher-performance device from Texas Instruments with enhanced current delivery capability. This provides design margin and allows the same regulator to support higher power applications. The 15A requirement of the original design is fully satisfied.

Q: Are there compliance differences between these parts?

A: The SC401BMLTRT is RoHS Compliant. The TPS548B22RVFR is ROHS3 Compliant and REACH Affected, representing current regulatory standards. Both meet EAR99 export classification and 8542.39.0001 HTSUS coding.

Q: What is the impact of selectable switching frequency on the TPS548B22RVFR?

A: The TPS548B22RVFR offers selectable switching frequency versus the fixed 1MHz of the SC401BMLTRT. This provides design flexibility for noise and efficiency optimization. Default operation can be configured to match the original 1MHz specification through external components or firmware control.