SC4521SETRT Equivalent & Substitute Parts

Part Overview

The SC4521SETRT is a buck switching regulator IC manufactured by Semtech Corporation, designed for positive adjustable output applications with 3A output current capability. This device operates across a 4.4V to 24V input range and delivers adjustable output voltage from 0.8V to 20.4V in an 8-SOIC surface mount package with exposed pad.

The SC4521SETRT is classified as obsolete. Identifying equivalent and substitute parts is necessary to ensure design continuity, maintain supply chain reliability, and support long-term product availability for applications currently utilizing this component.

Substiute Parts

SC4521SETRT

Semtech CorporationIn Stock: 34460SC4521SETRT Datasheet

Current PartRFQ

TPS54331QDRQ1

Texas InstrumentsIn Stock: 19208TPS54331QDRQ1 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SC4521SETRT is determined by the following critical parameters:

Functional Equivalence: The substitute part must operate as a buck (step-down) switching regulator with positive adjustable output configuration and single output.

Electrical Compatibility: The substitute must support the same output current rating (3A), adjustable output voltage range (0.8V minimum to at least 20.4V maximum), and compatible input voltage range. The SC4521SETRT operates from 4.4V to 24V input; substitutes must accommodate this range or provide extended capability.

Package Compatibility: The substitute must use the same 8-SOIC (0.154", 3.90mm Width) surface mount package to ensure PCB layout compatibility without redesign.

Operating Temperature Range: The substitute must maintain the -40°C to 125°C operating temperature specification.

Synchronous Rectifier Configuration: The SC4521SETRT uses a non-synchronous rectifier topology; substitutes must match this configuration.

The TPS54331QDRQ1 from Texas Instruments meets these substitution criteria across all critical parameters.

Parameter Comparison

Engineering Selection Recommendations

The TPS54331QDRQ1 is the manufacturer-recommended substitute for the SC4521SETRT. This recommendation is supported by the following factors:

Product Status: The SC4521SETRT is obsolete, while the TPS54331QDRQ1 maintains active production status, ensuring long-term availability and supply chain continuity.

Compliance and Qualification: The TPS54331QDRQ1 carries AEC-Q100 automotive qualification and is ROHS3 compliant, providing enhanced reliability documentation and regulatory alignment for applications requiring automotive-grade components.

Electrical Performance: The TPS54331QDRQ1 provides extended input voltage range (3.5V to 28V versus 4.4V to 24V) and extended output voltage range (0.8V to 25V versus 0.8V to 20.4V), offering greater design flexibility while maintaining identical output current (3A) and compatible switching frequency (570kHz versus 600kHz).

Package Compatibility: Both devices use identical 8-SOIC (0.154", 3.90mm Width) surface mount packages, enabling direct PCB layout compatibility without redesign.

Thermal and Environmental Specifications: Operating temperature range, moisture sensitivity level, and synchronous rectifier configuration are identical between both devices.

Frequently Asked Questions (FAQ)

Q: Can the TPS54331QDRQ1 directly replace the SC4521SETRT without PCB modifications?

A: Yes. Both devices use the 8-SOIC (0.154", 3.90mm Width) surface mount package with identical pinout compatibility for buck regulator applications. No PCB layout changes are required for package substitution.

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

A: The TPS54331QDRQ1 provides extended input voltage range (3.5V minimum versus 4.4V minimum) and extended output voltage range (25V maximum versus 20.4V maximum). Switching frequency differs slightly (570kHz versus 600kHz). Both maintain 3A output current and 0.8V minimum output voltage. These differences favor the TPS54331QDRQ1 for applications requiring wider voltage operating margins.

Q: Why is the SC4521SETRT obsolete?

A: The SC4521SETRT is classified as obsolete by Semtech Corporation. The TPS54331QDRQ1 represents the active, supported alternative for new designs and ongoing production requirements.

Q: Does the TPS54331QDRQ1 require different external component values?

A: External component selection (feedback resistors, input/output capacitors, inductor) is determined by the specific output voltage and current requirements of your application. Consult the TPS54331QDRQ1 datasheet for design guidance specific to your voltage and current specifications.

Q: What certifications does the TPS54331QDRQ1 carry?

A: The TPS54331QDRQ1 is AEC-Q100 qualified for automotive applications and ROHS3 compliant. The SC4521SETRT carries no automotive qualification designation.

Q: Are there inventory considerations for this substitution?

A: The SC4521SETRT has 34,409 pieces in stock as new original inventory. The TPS54331QDRQ1 has 19,173 pieces in stock. Both are available for immediate procurement.