FST3383MTCX Equivalent & Substitute Parts

Part Overview

The FST3383MTCX is a Bus FET Exchange Switch logic IC manufactured by onsemi, configured as a 5 x 2:2 multiplexer in a 24-TSSOP package. This component is classified as obsolete, making equivalent and substitute parts necessary for new designs and ongoing production support. The part operates on single supply voltage between 4V and 5.5V with an operating temperature range of -40°C to 85°C. Substitute parts must maintain functional equivalence in circuit topology, voltage supply requirements, and thermal operating range while accommodating different package formats and manufacturer specifications.

Substiute Parts

FST3383MTCX

onsemiIn Stock: 16583FST3383MTCX Datasheet

Current PartRFQ

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

Substitution eligibility is determined by the following critical parameters:

• Circuit Configuration: All substitutes must maintain 5 x 2:2 topology
• Voltage Supply Source: Single supply operation required
• Operating Temperature Range: -40°C to 85°C minimum
• Mounting Type: Surface mount only
• Independent Circuits: 1 circuit configuration

Substitute parts are grouped into two categories based on package compatibility:

Category 1 - 24-TSSOP Package (Direct Pin-Compatible)

• SN74CBT3383CPWR (Texas Instruments)
• SN74CBT3383PWR (Texas Instruments)
• SN74CBT3383PW (Texas Instruments)

Category 2 - 24-SSOP/24-QSOP Package (Functional Equivalent, Different Footprint)

• QS3383QG (Renesas Electronics Corporation)
• QS3383QG8 (Renesas Electronics Corporation)
• SN74CBT3383CDBQR (Texas Instruments)
• SN74CBT3383DBQR (Texas Instruments)
• SN74CBT3383DBR (Texas Instruments)

Category 3 - 24-TVSOP Package (Functional Equivalent, Different Footprint)

• SN74CBT3383DGVR (Texas Instruments)

Parameter Comparison

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement (Recommended Primary Choice)

SN74CBT3383CPWR is the preferred substitute. It maintains identical 24-TSSOP package dimensions, operates within the required voltage and temperature ranges, carries Active product status, and holds ROHS3 compliance. This part requires no PCB layout modifications and provides the longest product lifecycle support.

For Active Product Status with Extended Availability

QS3383QG and QS3383QG8 from Renesas Electronics Corporation are Active products with robust inventory levels. These parts require PCB footprint redesign due to 24-SSOP package format but offer superior long-term availability and ROHS3 compliance. The voltage supply range is narrower (4.75V ~ 5.25V) compared to the original specification.

For Last Time Buy Considerations

SN74CBT3383PWR, SN74CBT3383PW, and SN74CBT3383DBR carry Last Time Buy status, indicating limited future availability. These parts are suitable only for legacy production runs or applications where immediate redesign is not feasible.

For Discontinued Products

SN74CBT3383DGVR is discontinued at DiGi Electronics and should not be selected for new designs. Existing inventory may be available through alternative distribution channels but future supply cannot be guaranteed.

Frequently Asked Questions (FAQ)

Q: Can I use QS3383QG as a direct replacement for FST3383MTCX without PCB modifications?

A: No. While QS3383QG maintains functional equivalence in circuit topology and electrical specifications, it uses a 24-SSOP package (0.154" width) instead of the 24-TSSOP package (0.173" width) of the FST3383MTCX. PCB footprint redesign is required.

Q: What is the voltage supply difference between FST3383MTCX and its substitutes?

A: FST3383MTCX operates at 4V ~ 5.5V. Texas Instruments substitutes (74CBT series) operate at 4.5V ~ 5.5V, and Renesas substitutes (QS3383 series) operate at 4.75V ~ 5.25V. All ranges overlap sufficiently for standard 5V logic applications.

Q: Are all substitute parts RoHS compliant?

A: All active and last-time-buy substitute parts carry ROHS3 compliance. The original FST3383MTCX RoHS status is not specified in the provided data.

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

A: QS3383QG and QS3383QG8 from Renesas Electronics Corporation are classified as Active products, indicating ongoing production and support. SN74CBT3383CPWR from Texas Instruments is also Active and provides pin-compatible replacement without layout changes.

Q: What is the difference between MSL 1 and MSL 2 ratings?

A: MSL 1 (Unlimited) allows unlimited shelf life under controlled storage conditions. MSL 2 (1 Year) restricts shelf life to one year after moisture barrier bag opening. FST3383MTCX and most substitutes carry MSL 1 rating. SN74CBT3383CDBQR and SN74CBT3383DBQR carry MSL 2 rating, requiring more careful inventory management.

Q: Can I use SN74CBT3383DGVR as a substitute?

A: SN74CBT3383DGVR is discontinued at DiGi Electronics and should not be selected for new designs. It uses a 24-TVSOP package format different from the original 24-TSSOP, requiring PCB redesign. Future availability cannot be assured.