FST3384QSC Equivalent & Substitute Parts

Part Overview

The FST3384QSC is a bus switch logic IC manufactured by onsemi, featuring a 5 x 1:1 circuit configuration in a 24-QSOP package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The FST3384QSC operates with single supply voltage between 4V and 5.5V across an operating temperature range of -40°C to 85°C, serving applications requiring bus switching functionality in surface mount configurations.

Substiute Parts

FST3384QSC

onsemiIn Stock: 53183FST3384QSC Datasheet

Current PartRFQ

SN74CBT3384ADBQR

Texas InstrumentsIn Stock: 3299SN74CBT3384ADBQR Datasheet

DirectRFQ

CBT3384PW,118

NXP SemiconductorsIn Stock: 10003CBT3384PW,118 Datasheet

SimilarRFQ

PI5C3384QE

Diodes IncorporatedIn Stock: 18258PI5C3384QE Datasheet

SimilarRFQ

QS3384QG

Renesas Electronics CorporationIn Stock: 2196QS3384QG Datasheet

SimilarRFQ

QS3384QG8

Renesas Electronics CorporationIn Stock: 2738QS3384QG8 Datasheet

SimilarRFQ

SN74CBT3384ADBR

Texas InstrumentsIn Stock: 4838SN74CBT3384ADBR Datasheet

SimilarRFQ

SN74CBT3384ADGVR

Texas InstrumentsIn Stock: 4317SN74CBT3384ADGVR Datasheet

SimilarRFQ

SN74CBT3384CDBQR

Texas InstrumentsIn Stock: 3360SN74CBT3384CDBQR Datasheet

SimilarRFQ

SN74CBT3384CDGVR

Texas InstrumentsIn Stock: 3188SN74CBT3384CDGVR Datasheet

SimilarRFQ

SN74CBT3384CPW

Texas InstrumentsIn Stock: 2284SN74CBT3384CPW Datasheet

SimilarRFQ

SN74CBT3384CPWR

Texas InstrumentsIn Stock: 6210SN74CBT3384CPWR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the FST3384QSC is determined by the following critical parameters: bus switch circuit configuration (5 x 1:1), independent circuit count (2), voltage supply range compatibility, operating temperature range (-40°C to 85°C), and package type. Substitute parts must maintain the same functional circuit topology and electrical operating specifications. Package compatibility is evaluated based on physical dimensions and mounting type, with allowance for equivalent package designations (24-QSOP, 24-SSOP, 24-TSSOP) that share the same 0.154" to 0.173" width specification and surface mount technology.

Substitute parts are grouped into two categories: direct substitutes with identical or overlapping voltage supply ranges (4.5V ~ 5.5V or 4.75V ~ 5.25V) and compatible alternatives with equivalent functional specifications. Product status and compliance certifications are secondary selection criteria for design continuity.

Parameter Comparison

Engineering Selection Recommendations

For new designs and long-term procurement, select from parts with Active product status: CBT3384PW,118 (NXP), QS3384QG or QS3384QG8 (Renesas), SN74CBT3384CDBQR, SN74CBT3384CDGVR, or SN74CBT3384CPW (Texas Instruments). These parts ensure design continuity and ongoing manufacturer support.

For designs requiring package compatibility with the original 24-QSOP footprint, QS3384QG, QS3384QG8, and PI5C3384QE provide direct pin-compatible alternatives. QS3384QG and QS3384QG8 are preferred due to Active product status and ROHS3 compliance.

For applications where voltage supply range must accommodate the full 4V minimum specification of the FST3384QSC, note that most substitute parts specify 4.5V minimum. The FST3384QSC's 4V lower limit is not matched by available substitutes; designs operating below 4.5V require design review.

All recommended substitutes maintain identical circuit configuration (5 x 1:1), independent circuit count (2), and operating temperature range (-40°C to 85°C). Package variants (24-SSOP, 24-TSSOP, 24-TVSOP) are physically compatible with standard PCB layouts designed for 0.154" to 0.173" width surface mount packages.

Frequently Asked Questions (FAQ)

Q: Can SN74CBT3384CDBQR directly replace FST3384QSC in existing designs?

A: SN74CBT3384CDBQR is functionally equivalent with identical circuit configuration and operating temperature range. The 24-SSOP package (0.154" width) is footprint-compatible with 24-QSOP. Voltage supply range differs slightly (4.5V ~ 5.5V vs. 4V ~ 5.5V); designs operating below 4.5V require evaluation.

Q: What is the difference between QS3384QG and QS3384QG8?

A: Both parts are manufactured by Renesas Electronics with identical electrical specifications, circuit configuration, and operating parameters. The primary difference is packaging designation; both are available in 24-QSOP and are functionally interchangeable.

Q: Are 24-SSOP, 24-TSSOP, and 24-TVSOP packages interchangeable?

A: These package types are not physically interchangeable on the PCB. 24-SSOP (0.154" width) and 24-TSSOP (0.173" width) have different pitch specifications. 24-TVSOP (0.173" width) is a variant of the TSSOP family. PCB layout must be designed for the specific package type selected.

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

A: Parts with Active product status offer the best long-term availability: CBT3384PW,118 (NXP), QS3384QG and QS3384QG8 (Renesas), and SN74CBT3384CDBQR, SN74CBT3384CDGVR, SN74CBT3384CPW (Texas Instruments). Last Time Buy parts (SN74CBT3384ADBQR, SN74CBT3384ADBR, SN74CBT3384ADGVR, PI5C3384QE) have limited procurement windows.

Q: Does the FST3384QSC's 4V minimum voltage supply affect substitute selection?

A: Yes. Most substitute parts specify 4.5V minimum supply voltage. If your application requires operation at 4V to 4.5V, the FST3384QSC cannot be substituted without design modification or alternative component selection outside this product family.

Q: Are all substitute parts ROHS3 compliant?

A: No. The original FST3384QSC does not specify RoHS status. Most Texas Instruments substitutes (74CBT series) are ROHS3 compliant. Renesas (QS3384) and Diodes (PI5C3384QE) substitutes are ROHS3 compliant. NXP CBT3384PW,118 does not specify RoHS status in provided data.