74FST3257DR2G Equivalent & Substitute Parts

Part Overview

The 74FST3257DR2G is a 4 x 2:1 Multiplexer/Demultiplexer logic IC manufactured by onsemi in 16-SOIC surface mount packaging. This component is classified as Last Time Buy, indicating limited availability from the original manufacturer. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain flexibility for applications requiring this multiplexing functionality.

Substiute Parts

74FST3257DR2G

onsemiIn Stock: 443774FST3257DR2G Datasheet

Current PartRFQ

NLV74FST3257DR2G

onsemiIn Stock: 5235NLV74FST3257DR2G Datasheet

Parametric EquivalentRFQ

CBT3257AD,118

NXP SemiconductorsIn Stock: 46189CBT3257AD,118 Datasheet

DirectRFQ

CBT3257APW,118

Nexperia USA Inc.In Stock: 3196CBT3257APW,118 Datasheet

DirectRFQ

SN74CBT3257CD

Texas InstrumentsIn Stock: 1107SN74CBT3257CD Datasheet

DirectRFQ

SN74CBT3257CDR

Texas InstrumentsIn Stock: 2314SN74CBT3257CDR Datasheet

DirectRFQ

SN74CBT3257D

Texas InstrumentsIn Stock: 2177SN74CBT3257D Datasheet

DirectRFQ

SN74CBT3257DR

Texas InstrumentsIn Stock: 2629SN74CBT3257DR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74FST3257DR2G is determined by the following critical parameters:

• Circuit Configuration: 4 x 2:1 multiplexer/demultiplexer topology
• Package Type: 16-SOIC surface mount housing
• Voltage Supply Range: 4V to 5.5V single supply operation
• Operating Temperature Range: -40°C to 85°C
• Mounting Technology: Surface mount compatibility

Substitute parts are grouped into two categories:

Parametric Equivalent (Same Manufacturer, Different Packaging): NLV74FST3257DR2G maintains identical electrical specifications and 16-SOIC packaging but differs in packaging format (Cut Tape vs. Tape & Reel).

Direct Manufacturer Equivalents (Different Manufacturers, Compatible Specifications): Parts from NXP Semiconductors (CBT3257 series) and Texas Instruments (SN74CBT3257 series) provide equivalent 4 x 2:1 multiplexer functionality with compatible voltage and temperature specifications. These parts may differ in packaging options (16-SOIC, 16-TSSOP) and product status.

Parameter Comparison

Engineering Selection Recommendations

For Immediate Replacement with Active Status: SN74CBT3257CDR (Texas Instruments) and SN74CBT3257CD (Texas Instruments) are recommended as primary substitutes. Both maintain 16-SOIC packaging, compatible voltage and temperature specifications, and carry Active product status, ensuring long-term availability and supply chain stability.

For Tape & Reel Packaging Continuity: CBT3257APW,118 (Nexperia USA Inc.) provides Active status with Tape & Reel packaging but requires PCB layout accommodation for 16-TSSOP package geometry (4.40mm width vs. 3.90mm for 16-SOIC).

For Parametric Equivalence: NLV74FST3257DR2G maintains identical onsemi series specifications and 16-SOIC packaging but is classified as Obsolete, limiting its viability for new designs or long-term production.

Compliance Considerations: All substitute parts listed maintain ROHS3 compliance, MSL 1 rating, and REACH Unaffected status, matching the original part's regulatory requirements.

Frequently Asked Questions (FAQ)

Q: Can SN74CBT3257CDR be used as a direct replacement for 74FST3257DR2G?

A: Yes. Both parts share identical 4 x 2:1 circuit configuration, 16-SOIC packaging, -40°C to 85°C operating temperature range, and single supply voltage operation. The voltage supply range for SN74CBT3257CDR (4.5V ~ 5.5V) is a subset of the original part's range (4V ~ 5.5V), making it compatible with designs operating at 4.5V or higher.

Q: What is the difference between 16-SOIC and 16-TSSOP packaging?

A: Both are 16-pin surface mount packages but differ in physical dimensions. 16-SOIC has a 3.90mm width, while 16-TSSOP has a 4.40mm width. PCB footprints are not interchangeable; CBT3257APW,118 in 16-TSSOP requires a different land pattern than 16-SOIC parts.

Q: Why is the voltage supply range different between 74FST3257DR2G and CBT3257 series parts?

A: The 74FST3257DR2G supports 4V ~ 5.5V, while CBT3257 series parts support 4.5V ~ 5.5V. For applications requiring operation below 4.5V, the original 74FST3257DR2G or NLV74FST3257DR2G must be used. For standard 5V logic applications, CBT3257 series parts are fully compatible.

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

A: Last Time Buy indicates the manufacturer will no longer produce the part after existing inventory is depleted. For 74FST3257DR2G and SN74CBT3257D/SN74CBT3257DR, this status signals limited availability. Active status parts (SN74CBT3257CD, SN74CBT3257CDR, CBT3257AD,118, CBT3257APW,118) are recommended for new designs.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching the original 74FST3257DR2G specifications.