SN74LS258BD Equivalent & Substitute Parts

Part Overview

The SN74LS258BD is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Texas Instruments in a 16-SOIC surface mount package. This component functions as a data selector, routing one of two input signals to a single output based on control logic. The main part is currently in Last Time Buy status, indicating discontinued production with limited remaining inventory. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring this multiplexer functionality.

Substiute Parts

SN74LS258BD

Texas InstrumentsIn Stock: 1530SN74LS258BD Datasheet

Current PartRFQ

SN74LS258BDR

Texas InstrumentsIn Stock: 955SN74LS258BDR Datasheet

MFR RecommendedRFQ

SN74LS257BD

onsemiIn Stock: 2570SN74LS257BD Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74LS258BD is determined by strict equivalence across the following parameters:

• Circuit type and configuration: 4 x 2:1 multiplexer topology
• Electrical performance: Output current ratings (2.6mA high, 24mA low)
• Supply voltage range: 4.75V ~ 5.25V single supply operation
• Operating temperature: 0°C ~ 70°C
• Package format: 16-SOIC surface mount with identical pinout
• Series classification: 74LS logic family

Substitute parts must maintain identical electrical characteristics and physical package dimensions to ensure direct replacement without circuit redesign. Packaging format (Tube vs. Tape & Reel) does not affect functional equivalence but impacts procurement and assembly processes.

Parameter Comparison

Engineering Selection Recommendations

SN74LS258BDR (Recommended Substitute): This part is the primary equivalent for the SN74LS258BD. Both are manufactured by Texas Instruments with identical electrical specifications and package geometry. The SN74LS258BDR maintains Active product status, ensuring continued availability and supply chain stability. Both parts are ROHS3 compliant. The only difference is packaging format (Tape & Reel vs. Tube), which does not affect functional performance. This part is suitable for direct replacement in new designs and production continuity.

SN74LS257BD (Parametric Equivalent): This part meets all electrical and mechanical substitution criteria, including identical circuit configuration, output current ratings, supply voltage, operating temperature, and 16-SOIC package format. However, this part is manufactured by onsemi and carries Obsolete product status. Additionally, it is RoHS non-compliant, which may conflict with regulatory requirements in certain applications or regions. Use of this part should be limited to legacy system maintenance where RoHS compliance is not mandated.

Frequently Asked Questions (FAQ)

Q: Can SN74LS258BDR be used as a direct replacement for SN74LS258BD?

A: Yes. Both parts are electrically and mechanically identical 4 x 2:1 multiplexers in 16-SOIC packages with matching pinouts, supply voltage ranges, output current ratings, and operating temperature specifications. The difference in packaging format (Tape & Reel vs. Tube) does not affect circuit functionality.

Q: What is the difference between Tube and Tape & Reel packaging?

A: Tube packaging supplies components in plastic tubes for manual handling and small-quantity assembly. Tape & Reel packaging supplies components on continuous carrier tape for automated pick-and-place assembly. Both formats contain identical components; the difference is in procurement and assembly process compatibility.

Q: Is SN74LS257BD a suitable substitute?

A: SN74LS257BD meets all electrical and package specifications for functional substitution. However, it is manufactured by onsemi with Obsolete status and RoHS non-compliance. Use this part only in legacy applications where RoHS compliance is not required and where supply availability can be confirmed.

Q: Why is the main part (SN74LS258BD) in Last Time Buy status?

A: Last Time Buy status indicates the manufacturer has discontinued production and is accepting final orders before complete discontinuation. This necessitates identifying active substitute parts to maintain design continuity and supply chain reliability.

Q: Are there any differences in pinout between these multiplexer parts?

A: No. All three parts (SN74LS258BD, SN74LS258BDR, and SN74LS257BD) are 4 x 2:1 multiplexers in 16-SOIC packages with identical pinout configurations, enabling direct socket replacement without PCB redesign.

Q: What compliance certifications should I verify for my application?

A: Verify RoHS compliance requirements for your target market. SN74LS258BD and SN74LS258BDR are ROHS3 compliant. SN74LS257BD is RoHS non-compliant. Additionally, confirm REACH and ECCN classifications align with your supply chain and export requirements.