74FST3244DTR2 Equivalent & Substitute Parts

Part Overview

The 74FST3244DTR2 is a bus switch IC manufactured by onsemi, configured as a 4 x 1:1 logic switch in a 20-TSSOP package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 74FST3244DTR2 operates with a single supply voltage between 4V and 5.5V across an operating temperature range of -40°C to 85°C, serving applications requiring controlled signal routing in digital systems.

Substiute Parts

74FST3244DTR2

onsemiIn Stock: 89274FST3244DTR2 Datasheet

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SN74CBT3244CDBQR

Texas InstrumentsIn Stock: 3471SN74CBT3244CDBQR Datasheet

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SN74CBT3244CDGVR

Texas InstrumentsIn Stock: 2842SN74CBT3244CDGVR Datasheet

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SN74CBT3244CPW

Texas InstrumentsIn Stock: 1416SN74CBT3244CPW Datasheet

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SN74CBT3244DBQR

Texas InstrumentsIn Stock: 3335SN74CBT3244DBQR Datasheet

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SN74CBT3244DBR

Texas InstrumentsIn Stock: 2437SN74CBT3244DBR Datasheet

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SN74CBT3244DGVR

Texas InstrumentsIn Stock: 4992SN74CBT3244DGVR Datasheet

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SN74CBT3244PW

Texas InstrumentsIn Stock: 2164SN74CBT3244PW Datasheet

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SN74CBT3244PWR

Texas InstrumentsIn Stock: 22454SN74CBT3244PWR Datasheet

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SN74CBT3244CPWR

Texas InstrumentsIn Stock: 2244SN74CBT3244CPWR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74FST3244DTR2 is determined by the following critical parameters:

Functional Equivalence: All substitute parts maintain the 4 x 1:1 bus switch configuration with 2 independent circuits, ensuring identical signal routing capability.

Electrical Compatibility: All substitutes operate within the 4V to 5.5V supply voltage range and support the -40°C to 85°C operating temperature specification.

Package Compatibility: Substitutes are grouped by package type. The 20-TSSOP package (0.173", 4.40mm width) represents the closest mechanical match. Alternative packages including 20-SSOP and 20-TVSOP variants are available with different physical dimensions.

Supply Voltage Range Variation: Some substitutes specify a narrower supply range of 4.5V to 5.5V, which remains compatible with the original 4V to 5.5V specification for applications operating within the 4.5V to 5.5V window.

Product Status Consideration: Active status substitutes provide long-term availability, while Last Time Buy variants offer transitional solutions with defined procurement windows.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation for New Designs: SN74CBT3244CPWR (Texas Instruments) is the optimal substitute. This part maintains full electrical compatibility with the 74FST3244DTR2, including the complete 4V to 5.5V supply voltage range and identical 20-TSSOP package dimensions. The SN74CBT3244CPWR carries Active product status, ensuring long-term availability and supply continuity. ROHS3 compliance and MSL 1 rating align with modern manufacturing standards.

Package-Matched Alternative: SN74CBT3244CPW provides identical 20-TSSOP packaging with Active status and full voltage range compatibility. This variant differs only in packaging format (Tube versus Tape & Reel).

For Existing Inventory Constraints: SN74CBT3244CDBQR and SN74CBT3244CDGVR offer Active status with ROHS3 compliance. These parts accommodate the full 4V to 5.5V range but utilize alternative packages (20-SSOP and 20-TVSOP respectively), requiring PCB layout modification.

Transitional Solutions: SN74CBT3244DBQR, SN74CBT3244DBR, SN74CBT3244DGVR, and SN74CBT3244PW carry Last Time Buy status. These parts remain functionally equivalent but operate within the narrower 4.5V to 5.5V supply range and have defined end-of-life procurement windows.

Compliance Consideration: All Texas Instruments substitutes provide ROHS3 compliance, addressing regulatory requirements absent in the original onsemi part.

Frequently Asked Questions (FAQ)

Q: Can SN74CBT3244CPWR directly replace 74FST3244DTR2 without PCB modification?

A: Yes. The SN74CBT3244CPWR maintains identical 20-TSSOP package dimensions (0.173", 4.40mm width), pin count, and electrical specifications. Direct substitution on existing PCBs is possible without layout changes.

Q: What is the difference between 20-TSSOP and 20-SSOP packages?

A: The 20-TSSOP package measures 0.173" width (4.40mm), while 20-SSOP variants measure either 0.154" (3.90mm) or 0.209" (5.30mm) width. These dimensional differences require PCB footprint modification and cannot be used interchangeably without layout redesign.

Q: Why do some substitutes specify 4.5V to 5.5V instead of 4V to 5.5V?

A: The narrower voltage range represents the manufacturer's tested and guaranteed operating window. Parts with 4.5V to 5.5V specification remain compatible with systems operating within this range but do not guarantee operation at 4V. Applications requiring 4V operation must use parts specifying the full 4V to 5.5V range.

Q: What does Last Time Buy status mean for procurement?

A: Last Time Buy indicates the manufacturer has announced end-of-life for that specific part number. A final purchase window exists before production ceases. These parts remain functionally equivalent but should not be selected for new long-term designs.

Q: Are all substitutes RoHS compliant?

A: All Texas Instruments substitutes carry ROHS3 compliance. The original 74FST3244DTR2 is RoHS non-compliant. This compliance difference may be relevant for applications subject to RoHS regulations.

Q: What is Moisture Sensitivity Level (MSL) and why does it vary?

A: MSL indicates the maximum time a component can be exposed to ambient humidity before soldering. MSL 1 (Unlimited) allows indefinite storage without moisture control. MSL 2 (1 Year) requires controlled storage conditions. For standard manufacturing environments, both ratings are acceptable, but MSL 1 provides greater handling flexibility.