FST3253QSC Equivalent & Substitute Parts

Part Overview

The FST3253QSC is a Multiplexer/Demultiplexer logic IC with 2 x 4:1 circuit configuration, manufactured by onsemi in a 16-QSOP surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The FST3253QSC operates with single supply voltage between 4V and 5.5V across an operating temperature range of -40°C to 85°C, serving applications requiring signal routing and multiplexing functions in logic circuits.

Substiute Parts

FST3253QSC

onsemiIn Stock: 2040FST3253QSC Datasheet

Current PartRFQ

SN74CBT3253DBQR

Texas InstrumentsIn Stock: 5815SN74CBT3253DBQR Datasheet

DirectRFQ

CBT3253ADS,118

Nexperia USA Inc.In Stock: 750CBT3253ADS,118 Datasheet

SimilarRFQ

PI5C3253QE

Diodes IncorporatedIn Stock: 2848PI5C3253QE Datasheet

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PI5C3253QEX

Diodes IncorporatedIn Stock: 36663PI5C3253QEX Datasheet

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QS3253QG

Renesas Electronics CorporationIn Stock: 3892QS3253QG Datasheet

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QS3253QG8

Renesas Electronics CorporationIn Stock: 2672QS3253QG8 Datasheet

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SN74CBT3253CDBQR

Texas InstrumentsIn Stock: 2287SN74CBT3253CDBQR Datasheet

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SN74CBT3253CDBR

Texas InstrumentsIn Stock: 2090SN74CBT3253CDBR Datasheet

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SN74CBT3253DBR

Texas InstrumentsIn Stock: 6381SN74CBT3253DBR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the FST3253QSC is determined by strict equivalence across the following parameters: circuit configuration (2 x 4:1), independent circuits (1), voltage supply source (single supply), operating temperature range (-40°C ~ 85°C), and mounting type (surface mount). All substitute parts maintain these core electrical and mechanical specifications.

The substitute parts are grouped into two categories based on package compatibility:

Group 1 - 16-SSOP Package (0.154", 3.90mm Width): SN74CBT3253DBQR, CBT3253ADS,118, SN74CBT3253CDBQR, SN74CBT3253CDBR, and SN74CBT3253DBR. These parts share identical package dimensions with the original FST3253QSC and require no PCB layout modifications.

Group 2 - 16-QSOP Package: PI5C3253QE, PI5C3253QEX, QS3253QG, and QS3253QG8. These parts maintain the same 16-pin QSOP package format as the FST3253QSC.

Voltage supply ranges vary slightly among substitutes (4.5V ~ 5.5V for Texas Instruments and Nexperia parts; 4.75V ~ 5.25V for Diodes and Renesas parts), all remaining compatible with the original 4V ~ 5.5V specification through overlap in the operating window.

Parameter Comparison

Engineering Selection Recommendations

For new designs and long-term procurement, select from parts with Active product status: CBT3253ADS,118 (Nexperia), PI5C3253QE or PI5C3253QEX (Diodes Incorporated), and QS3253QG or QS3253QG8 (Renesas Electronics Corporation). These parts offer unlimited MSL ratings and ROHS3 compliance, ensuring supply chain stability and regulatory compliance.

For existing designs currently using FST3253QSC, CBT3253ADS,118 provides the most direct replacement with identical package dimensions (16-SSOP, 0.154" width), active product status, and unlimited MSL. This part requires no PCB layout modifications and maintains full electrical compatibility.

Texas Instruments parts (SN74CBT3253DBQR, SN74CBT3253CDBQR, SN74CBT3253CDBR, SN74CBT3253DBR) are available but carry Last Time Buy or limited MSL ratings. SN74CBT3253CDBR and SN74CBT3253DBR feature a wider 16-SSOP package (0.209" width) and require PCB layout verification before implementation.

All substitute parts maintain the required operating temperature range (-40°C ~ 85°C) and single supply voltage operation. Voltage supply range variations (4.5V ~ 5.5V versus 4.75V ~ 5.25V) do not impact compatibility with the original 4V ~ 5.5V specification due to overlapping operating windows.

Frequently Asked Questions (FAQ)

Q: Can I directly replace FST3253QSC with any of these substitute parts?

A: Direct replacement depends on package compatibility. Parts with 16-SSOP package at 0.154" width (CBT3253ADS,118, PI5C3253QE, PI5C3253QEX, QS3253QG, QS3253QG8, SN74CBT3253DBQR, SN74CBT3253CDBQR) require no PCB modifications. Parts with 16-SSOP at 0.209" width (SN74CBT3253CDBR, SN74CBT3253DBR) require PCB layout verification.

Q: What is the difference between the Diodes Incorporated PI5C3253QE and PI5C3253QEX?

A: Both parts are electrically identical with the same circuit configuration, voltage supply range (4.75V ~ 5.25V), and operating temperature. The primary difference is packaging format: PI5C3253QE is supplied in Tube, while PI5C3253QEX is supplied in Tape & Reel (TR).

Q: Why do some substitute parts have different voltage supply ranges?

A: Voltage supply ranges vary by manufacturer specification: Texas Instruments and Nexperia specify 4.5V ~ 5.5V, while Diodes Incorporated and Renesas specify 4.75V ~ 5.25V. All ranges overlap with the original FST3253QSC specification (4V ~ 5.5V), ensuring functional compatibility in standard 5V logic applications.

Q: What does MSL rating mean for component selection?

A: Moisture Sensitivity Level (MSL) indicates the maximum time a component can be exposed to ambient conditions before soldering. MSL 1 (Unlimited) allows indefinite storage without special handling. MSL 2 (1 Year) requires controlled storage conditions. For long-term inventory, select MSL 1 rated parts.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts listed are ROHS3 compliant. The original FST3253QSC does not specify RoHS status. All substitutes meet current environmental and regulatory requirements.

Q: Which substitute part offers the best long-term availability?

A: CBT3253ADS,118 (Nexperia), PI5C3253QEX (Diodes Incorporated), QS3253QG, and QS3253QG8 (Renesas) all carry Active product status, indicating ongoing manufacturing and supply. These parts are recommended for new designs requiring long-term component availability.