SN74LS258BNSR Equivalent & Substitute Parts

Part Overview

The SN74LS258BNSR is a 4 x 2:1 multiplexer logic integrated circuit manufactured by Texas Instruments in the 74LS series. This component is classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support, maintenance, and production continuity. The part operates as a single-supply multiplexer with standard TTL logic levels and surface mount packaging.

Substiute Parts

SN74LS258BNSR

Texas InstrumentsIn Stock: 3119SN74LS258BNSR Datasheet

Current PartRFQ

SN74LS258BDR

Texas InstrumentsIn Stock: 955SN74LS258BDR Datasheet

MFR RecommendedRFQ

SN74LS257BNSR

Texas InstrumentsIn Stock: 724SN74LS257BNSR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN74LS258BNSR is determined by strict equivalence across the following critical parameters: multiplexer circuit configuration (4 x 2:1), output current specifications (2.6mA high, 24mA low), supply voltage range (4.75V ~ 5.25V), operating temperature range (0°C ~ 70°C), and RoHS3 compliance status.

Two substitute parts meet these criteria:

SN74LS258BDR qualifies as a manufacturer-recommended substitute. It maintains identical electrical specifications and circuit configuration but differs in packaging format (Tape & Reel versus standard packaging) and package case dimensions (16-SOIC 0.154" width versus 0.209" width). The part is currently active in production.

SN74LS257BNSR qualifies as a parametric equivalent. It maintains identical electrical specifications, operating parameters, and package case dimensions (16-SOIC 0.209" width) as the main part. The base product number differs (74LS257 versus 74LS258), indicating a related but distinct device within the same logic family. This part is currently active in production.

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the obsolete SN74LS258BNSR, the SN74LS257BNSR is the preferred substitute when direct form-factor compatibility is required. This part maintains identical package dimensions (16-SOIC 0.209" width), electrical specifications, and compliance certifications while offering active production status and current availability.

The SN74LS258BDR serves as an alternative when packaging format flexibility exists. This manufacturer-recommended substitute provides identical electrical performance and RoHS3 compliance but features a narrower package case (0.154" width) and Tape & Reel packaging. PCB layout verification is necessary to confirm compatibility with the reduced package width.

Both substitute parts carry ROHS3 compliance and unlimited moisture sensitivity rating, matching the environmental and regulatory requirements of the original part.

Frequently Asked Questions (FAQ)

Q: Can SN74LS258BDR be used as a direct replacement for SN74LS258BNSR on existing PCBs?

A: Electrical substitution is valid. However, the SN74LS258BDR features a narrower package case (0.154" width versus 0.209" width). PCB footprint compatibility must be verified before implementation. If the PCB is designed for the wider 0.209" package, the narrower 0.154" package may not align properly with existing pads.

Q: What is the functional difference between SN74LS258BNSR and SN74LS257BNSR?

A: Both parts are 4 x 2:1 multiplexers with identical electrical specifications, output current ratings, supply voltage ranges, and operating temperature ranges. The base product numbers (74LS258 versus 74LS257) indicate different device designations within the 74LS logic family, but parametric equivalence is confirmed across all provided specifications.

Q: Are all three parts RoHS3 compliant?

A: Yes. The SN74LS258BNSR (obsolete), SN74LS258BDR, and SN74LS257BNSR all carry ROHS3 compliance certification and unlimited moisture sensitivity rating (MSL 1).

Q: Which substitute should be selected for new designs?

A: For new designs, either SN74LS258BDR or SN74LS257BNSR is acceptable based on packaging requirements. Both parts are active in production. If package case width is not constrained, SN74LS257BNSR maintains the original 0.209" width specification. If narrower packaging is acceptable, SN74LS258BDR offers an alternative with identical electrical performance.

Q: What inventory status should be considered when selecting a substitute?

A: Current inventory levels are SN74LS258BDR (868 Pcs) and SN74LS257BNSR (703 Pcs). Availability may vary by supplier and region. Confirm current stock status with your component distributor before finalizing procurement decisions.