74FST3244DWR2 Equivalent & Substitute Parts

Part Overview

The 74FST3244DWR2 is a bus switch IC manufactured by onsemi, configured as a 4 x 1:1 multiplexer in a 20-SOIC surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and production continuity. The 74FST series has been superseded by the 74CBT series from Texas Instruments, which maintains functional and electrical compatibility while offering active product status and improved compliance certifications.

Substiute Parts

74FST3244DWR2

onsemiIn Stock: 74574FST3244DWR2 Datasheet

Current PartRFQ

SN74CBT3244CDW

Texas InstrumentsIn Stock: 2237SN74CBT3244CDW Datasheet

SimilarRFQ

SN74CBT3244DW

Texas InstrumentsIn Stock: 1984SN74CBT3244DW Datasheet

SimilarRFQ

SN74CBT3244DWR

Texas InstrumentsIn Stock: 2725SN74CBT3244DWR Datasheet

SimilarRFQ

SN74CBT3244CDWR

Texas InstrumentsIn Stock: 3009SN74CBT3244CDWR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74FST3244DWR2 is based on strict equivalence across the following parameters:

• Circuit configuration: 4 x 1:1 multiplexer topology with 2 independent circuits
• Voltage supply range: 4V ~ 5.5V operating window
• Operating temperature range: -40°C ~ 85°C
• Package specification: 20-SOIC form factor with identical pin count and pitch
• Moisture sensitivity level: MSL 1 (Unlimited)
• Mounting technology: Surface mount compatibility

The substitute parts listed below maintain these electrical and mechanical specifications. Variations in product status, packaging format (tube vs. tape & reel), and compliance certifications are noted but do not affect functional interchangeability at the circuit level.

Parameter Comparison

Engineering Selection Recommendations

For new designs and production continuity, SN74CBT3244CDWR is the primary recommended substitute. This part maintains the full voltage supply range of 4V ~ 5.5V matching the original 74FST3244DWR2, carries Active product status ensuring long-term availability, and is ROHS3 compliant. The tape & reel packaging format supports high-volume manufacturing workflows.

SN74CBT3244CDW provides an alternative with Active status and ROHS3 compliance, available in tube packaging. This part is suitable for lower-volume applications or where tube packaging is preferred.

SN74CBT3244DW and SN74CBT3244DWR are functionally equivalent but carry Last Time Buy status, indicating limited future availability. These parts operate within a reduced voltage supply window of 4.5V ~ 5.5V, which may restrict application in systems requiring the full 4V minimum specification. Selection of these parts should account for end-of-life planning.

Frequently Asked Questions (FAQ)

Q: Can SN74CBT3244DW be used as a direct replacement for 74FST3244DWR2?

A: SN74CBT3244DW is functionally equivalent in circuit configuration, temperature range, and package form factor. However, it operates within a reduced voltage supply range of 4.5V ~ 5.5V compared to the original 4V ~ 5.5V specification. Substitution is valid only if your application operates within the 4.5V ~ 5.5V window. For designs requiring the full 4V minimum, use SN74CBT3244CDW or SN74CBT3244CDWR instead.

Q: What is the difference between tape & reel and tube packaging?

A: Tape & reel packaging is optimized for automated assembly processes and high-volume production, with components wound on continuous tape. Tube packaging is suitable for manual assembly, lower-volume builds, or component storage. Both formats contain identical components; packaging selection depends on manufacturing process requirements.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All Texas Instruments SN74CBT3244 variants listed are ROHS3 compliant. The original 74FST3244DWR2 is RoHS non-compliant. If RoHS compliance is a design requirement, any of the listed substitutes satisfy this criterion.

Q: What does "Last Time Buy" product status mean?

A: Last Time Buy indicates that the manufacturer has announced end-of-life for the part. Existing inventory may be available for a limited period, but no new production is planned. Parts with this status should not be selected for new designs requiring long-term support. Use Active status parts (SN74CBT3244CDW or SN74CBT3244CDWR) for ongoing production.

Q: Are the pin configurations identical between 74FST3244DWR2 and SN74CBT3244 variants?

A: Yes. All parts maintain the 20-SOIC package specification with identical pin count and pitch, ensuring direct PCB compatibility without layout modifications.