SN74F257D Equivalent & Substitute Parts

Part Overview

The SN74F257D is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This component is classified as Last Time Buy, indicating limited availability and the necessity to identify suitable alternatives for ongoing production and maintenance applications. The SN74F257D operates with a single supply voltage between 4.5V and 5.5V and is designed for applications requiring multiplexing of four independent 2:1 data paths.

Substiute Parts

SN74F257D

Texas InstrumentsIn Stock: 2044SN74F257D Datasheet

Current PartRFQ

SN74F257DR

Texas InstrumentsIn Stock: 5337SN74F257DR Datasheet

MFR RecommendedRFQ

SN74F258D

Texas InstrumentsIn Stock: 1088SN74F258D Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74F257D is determined by strict equivalence across the following critical parameters:

• Circuit configuration: 4 x 2:1 multiplexer topology
• Package type: 16-SOIC surface mount form factor
• Electrical specifications: Voltage supply 4.5V ~ 5.5V, output current ratings 3mA / 24mA
• Operating temperature range: 0°C ~ 70°C
• Compliance certifications: ROHS3, REACH Unaffected status

Two substitute parts meet these criteria. The SN74F257DR is the manufacturer-recommended substitute, differing only in packaging format (Tape & Reel versus Tube) and product status (Active versus Last Time Buy). The SN74F258D is a parametric equivalent that maintains identical electrical and mechanical specifications while offering Active product status.

Parameter Comparison

Engineering Selection Recommendations

For new designs and ongoing production, the SN74F257DR is the primary substitute. It maintains identical electrical and mechanical specifications to the SN74F257D while offering Active product status and continuous availability through Tape & Reel packaging, which is standard for high-volume manufacturing operations.

The SN74F258D serves as an alternative substitute with Active product status and Tube packaging. Selection between SN74F257DR and SN74F258D depends on procurement requirements: Tape & Reel format for automated assembly processes, or Tube format for lower-volume applications.

Both substitutes are ROHS3 compliant and REACH unaffected, meeting regulatory requirements equivalent to the original part. The transition from Last Time Buy status to Active status ensures long-term component availability and supply chain stability.

Frequently Asked Questions (FAQ)

Q: Can SN74F257DR be used as a direct replacement for SN74F257D in existing designs?

A: Yes. The SN74F257DR is electrically and mechanically identical to the SN74F257D. The only difference is packaging format (Tape & Reel versus Tube) and product status. No circuit modifications are required.

Q: What is the difference between SN74F257DR and SN74F258D?

A: Both parts are parametric equivalents with identical electrical specifications and 16-SOIC package dimensions. The primary difference is packaging format: SN74F257DR uses Tape & Reel, while SN74F258D uses Tube. Selection depends on assembly process requirements.

Q: Why is the SN74F257D classified as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has discontinued active production of this specific part number. Substitutes with Active status (SN74F257DR and SN74F258D) are recommended for new designs and future production runs.

Q: Are there any electrical performance differences between these three parts?

A: No. All three parts share identical electrical specifications: 4.5V ~ 5.5V supply voltage, 3mA / 24mA output current ratings, 0°C ~ 70°C operating temperature range, and 4 x 2:1 multiplexer circuit configuration.

Q: Do these parts require different PCB footprints?

A: No. All three parts use the 16-SOIC (0.154", 3.90mm Width) package, requiring identical PCB footprints and land patterns.

Q: Are compliance certifications identical across all three parts?

A: Yes. All three parts are ROHS3 compliant, REACH unaffected, and carry identical moisture sensitivity levels (MSL 1 - Unlimited).