FST3383QSC Bus FET Exchange Switch Equivalent & Substitute Parts

Part Overview

The FST3383QSC is a Bus FET Exchange Switch manufactured by onsemi, designed for 5 x 2:2 switching applications in 24-QSOP packaging. This component operates with a single supply voltage range of 4V to 5.5V and supports operating temperatures from -40°C to 85°C. The FST3383QSC is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain the same functional circuit configuration and core electrical specifications while offering active product status and improved availability.

Substiute Parts

FST3383QSC

onsemiIn Stock: 972FST3383QSC Datasheet

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QS3383QG

Renesas Electronics CorporationIn Stock: 1442QS3383QG Datasheet

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QS3383QG8

Renesas Electronics CorporationIn Stock: 3002QS3383QG8 Datasheet

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SN74CBT3383CDBQR

Texas InstrumentsIn Stock: 2409SN74CBT3383CDBQR Datasheet

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SN74CBT3383CPWR

Texas InstrumentsIn Stock: 2618SN74CBT3383CPWR Datasheet

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SN74CBT3383DBQR

Texas InstrumentsIn Stock: 4277SN74CBT3383DBQR Datasheet

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SN74CBT3383DBR

Texas InstrumentsIn Stock: 1107SN74CBT3383DBR Datasheet

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SN74CBT3383DGVR

Texas InstrumentsIn Stock: 3912SN74CBT3383DGVR Datasheet

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SN74CBT3383PW

Texas InstrumentsIn Stock: 1600SN74CBT3383PW Datasheet

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SN74CBT3383PWR

Texas InstrumentsIn Stock: 3239SN74CBT3383PWR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FST3383QSC are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Core Functional Parameters:

• Type: Bus FET Exchange Switch
• Circuit Configuration: 5 x 2:2
• Independent Circuits: 1
• Voltage Supply Source: Single Supply
• Operating Temperature Range: -40°C ~ 85°C
• Mounting Type: Surface Mount

Electrical Compatibility Parameters:

• Voltage Supply Range: Must overlap with or encompass the original 4V ~ 5.5V specification
• Moisture Sensitivity Level: MSL 1 or MSL 2 acceptable for equivalent substitution

Mechanical Compatibility Parameters:

• Package Type: 24-pin SSOP, TSSOP, or QSOP variants
• Pin Count: 24 pins
• Package Width: 3.90mm to 5.30mm (within standard SSOP/TSSOP tolerances)

All substitute parts listed maintain identical circuit functionality, pin configuration, and thermal operating range. Variations in package width and voltage supply range represent minor deviations that remain within acceptable engineering tolerances for direct substitution.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Active Product Status):

For new designs and production continuity, the Renesas QS3383QG and QS3383QG8 parts are recommended as primary substitutes. Both maintain identical circuit configuration, package dimensions, and operating temperature range. These parts are currently in active production status with ROHS3 compliance certification and unlimited moisture sensitivity rating (MSL 1). Inventory availability for both variants exceeds 1,300 units.

The Texas Instruments SN74CBT3383CDBQR and SN74CBT3383DBQR offer alternative substitution with active product status and ROHS3 compliance. These parts maintain the same 24-SSOP package footprint as the original FST3383QSC with 3.90mm width. The voltage supply range of 4.5V to 5.5V fully encompasses the original specification. Both variants have inventory availability exceeding 2,300 units.

Secondary Substitutes (Last Time Buy / Discontinued Status):

The Texas Instruments SN74CBT3383CPWR, SN74CBT3383PW, and SN74CBT3383PWR are available but classified as Last Time Buy, indicating limited future availability. These parts use 24-TSSOP packaging with 4.40mm width, requiring PCB layout modification from the original 24-QSOP footprint. All three maintain ROHS3 compliance and MSL 1 rating with active inventory.

The SN74CBT3383DBR is classified as Last Time Buy with 1,010 units in stock. This part uses 24-SSOP packaging with 5.30mm width, representing the widest package variant. The increased package width may require PCB layout verification.

The SN74CBT3383DGVR is discontinued at DiGi Electronics and uses 24-TVSOP packaging. This variant is not recommended for new designs due to discontinued status.

Compliance Considerations:

All substitute parts maintain REACH Unaffected status and EAR99 export classification consistent with the original FST3383QSC. All active and Last Time Buy variants are ROHS3 compliant. Moisture sensitivity levels range from MSL 1 (unlimited) to MSL 2 (1 year), both acceptable for standard manufacturing environments.

Frequently Asked Questions (FAQ)

Q: Can I directly replace FST3383QSC with QS3383QG or QS3383QG8?

A: Yes. Both Renesas parts maintain identical circuit configuration (5 x 2:2), package type (24-QSOP), package width (3.90mm), operating temperature range (-40°C to 85°C), and supply voltage compatibility (4.75V to 5.25V overlaps with the original 4V to 5.5V specification). These are direct pin-compatible substitutes requiring no PCB modification.

Q: What is the difference between the Texas Instruments 24-SSOP and 24-TSSOP variants?

A: The 24-SSOP variants (SN74CBT3383CDBQR, SN74CBT3383DBQR, SN74CBT3383DBR) use standard SSOP packaging with package widths of 3.90mm to 5.30mm. The 24-TSSOP variants (SN74CBT3383CPWR, SN74CBT3383PW, SN74CBT3383PWR) use thin SSOP packaging with 4.40mm width. Both package types are electrically equivalent but require different PCB footprints. Verify your PCB layout accommodates the selected package width before substitution.

Q: Are all substitute parts ROHS3 compliant?

A: All active and Last Time Buy substitute parts listed are ROHS3 compliant. The original FST3383QSC does not specify RoHS status. All parts maintain REACH Unaffected status.

Q: What is the voltage supply range compatibility?

A: The original FST3383QSC operates at 4V to 5.5V. Renesas QS3383QG variants operate at 4.75V to 5.25V, which is a subset of the original range. Texas Instruments SN74CBT3383 variants operate at 4.5V to 5.5V, which fully encompasses the original specification. Both ranges are compatible with standard 5V supply systems.

Q: Which substitute part has the best availability?

A: QS3383QG8 (Renesas) has the highest inventory with 2,958 units in stock. SN74CBT3383DBQR (Texas Instruments) has 4,214 units available. Both parts are in active production status.

Q: Can I use Last Time Buy parts for new production designs?

A: Last Time Buy parts (SN74CBT3383DBR, SN74CBT3383PW, SN74CBT3383PWR) are electrically equivalent substitutes but have limited future availability. These parts are suitable for existing production runs with known end-of-life dates but are not recommended for new product designs requiring long-term component supply.

Q: What is the moisture sensitivity level (MSL) difference between parts?

A: MSL 1 (unlimited) parts have no shelf-life restrictions and are suitable for all manufacturing environments. MSL 2 (1 year) parts require controlled storage and have a one-year shelf life from the date of manufacture. Both ratings are acceptable for standard manufacturing. MSL 1 parts (Renesas QS3383QG variants and most Texas Instruments parts) offer greater flexibility for inventory management.