SC4503TSKTRT Equivalent & Substitute Parts

Part Overview

The SC4503TSKTRT is a boost switching regulator IC manufactured by Semtech Corporation, designed for positive adjustable output applications. This component operates as a step-up converter with a maximum output current of 1.4A and supports input voltages from 2.5V to 20V with adjustable output ranging from 2.5V to 27V. The device is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

SC4503TSKTRT

Semtech CorporationIn Stock: 50405SC4503TSKTRT Datasheet

Current PartRFQ

LM27313XMF/NOPB

Texas InstrumentsIn Stock: 26891LM27313XMF/NOPB Datasheet

MFR RecommendedRFQ

LM27313XMFX/NOPB

Texas InstrumentsIn Stock: 29106LM27313XMFX/NOPB Datasheet

MFR RecommendedRFQ

TPS55332QPWPRQ1

Texas InstrumentsIn Stock: 4302TPS55332QPWPRQ1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC4503TSKTRT is determined by the following critical parameters: boost converter topology, positive adjustable output configuration, single output, input voltage range compatibility, output voltage range compatibility, and surface mount packaging in SOT-23-5 form factor.

The identified substitute parts meet these core requirements:

• Topology: All substitutes maintain boost (step-up) switching regulator architecture
• Output Type: All provide positive adjustable output with single output configuration
• Input Voltage: Substitute input ranges must encompass or exceed the 2.5V minimum and 20V maximum of the original part
• Output Voltage: Substitute output ranges must support the 2.5V to 27V envelope of the original part
• Package Compatibility: All substitutes are available in SOT-23-5 surface mount packaging
• Compliance: All substitutes maintain RoHS compliance status

Parameter Comparison

Engineering Selection Recommendations

LM27313XMF/NOPB and LM27313XMFX/NOPB: These Texas Instruments devices are functionally equivalent boost regulators in active production status with ROHS3 compliance. Both maintain the SOT-23-5 package form factor and support adjustable positive output. The output current rating of 800mA is lower than the SC4503TSKTRT's 1.4A specification. The input voltage maximum of 14V is below the original part's 20V maximum, limiting applicability to designs with lower input voltage requirements. Operating temperature range extends to 125°C, exceeding the original specification. These parts are suitable for applications where output current does not exceed 800mA and input voltage remains below 14V.

TPS55332QPWPRQ1: This Texas Instruments automotive-grade boost regulator (AEC-Q100 qualified) offers superior performance characteristics including 3A output current, extended input voltage range (1.5V to 40V), and higher output voltage capability (up to 50V). The device operates across -40°C to 150°C and features programmable switching frequency (80kHz to 2.2MHz). The 20-PowerTSSOP package differs from the original SOT-23-5 form factor, requiring PCB layout modification. This part is suitable for applications requiring higher current capacity, extended voltage ranges, or automotive qualification.

All substitute parts maintain active production status and current compliance certifications, ensuring long-term availability and regulatory adherence.

Frequently Asked Questions (FAQ)

Q: Can the LM27313 series directly replace the SC4503TSKTRT in existing designs?

A: Direct replacement is possible only if the application operates with output current below 800mA and input voltage below 14V. The LM27313 series maintains identical boost converter topology, adjustable positive output configuration, and SOT-23-5 packaging. However, the reduced current rating and input voltage maximum may limit compatibility with designs utilizing the full 1.4A or 20V specifications of the original part.

Q: What are the package compatibility considerations for the TPS55332QPWPRQ1?

A: The TPS55332QPWPRQ1 uses a 20-PowerTSSOP package, which differs from the SC4503TSKTRT's SOT-23-5 form factor. This requires redesign of the PCB footprint and layout. The larger package provides improved thermal characteristics and higher current handling capability but necessitates additional board space.

Q: Are all substitute parts RoHS compliant?

A: Yes. The LM27313XMF/NOPB and LM27313XMFX/NOPB are ROHS3 compliant. The TPS55332QPWPRQ1 is also ROHS3 compliant. All substitutes meet current regulatory requirements.

Q: Which substitute part is recommended for applications requiring the highest output current?

A: The TPS55332QPWPRQ1 provides 3A output current, exceeding both the original SC4503TSKTRT (1.4A) and the LM27313 series (800mA). This part is suitable for high-current boost applications.

Q: What is the significance of the SC4503TSKTRT being classified as obsolete?

A: Obsolete status indicates the part is no longer manufactured by Semtech Corporation. Existing inventory may be available through authorized distributors, but long-term supply cannot be guaranteed. Transition to an active substitute part is recommended for new designs and ongoing production requirements.

Q: Can the LM27313XMFX/NOPB be used interchangeably with the LM27313XMF/NOPB?

A: Both parts are functionally identical boost regulators with identical electrical specifications, operating temperature range, and SOT-23-5 packaging. The primary difference is packaging format (Cut Tape vs. Digi-Reel). Selection between these variants depends on procurement and assembly requirements rather than electrical performance.