SN74ALS151D Equivalent & Substitute Parts

Part Overview

The SN74ALS151D is a 1 x 8:1 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 for future procurement. The SN74ALS151D operates with a single supply voltage between 4.5V and 5.5V and is suitable for applications requiring 8-to-1 data selection with output currents of 2.6mA (high) and 24mA (low). Identifying equivalent and substitute parts is essential for design flexibility, inventory management, and ensuring continuity of supply as the original part approaches end-of-life status.

Substiute Parts

SN74ALS151D

Texas InstrumentsIn Stock: 1407SN74ALS151D Datasheet

Current PartRFQ

SN74ALS151DR

Texas InstrumentsIn Stock: 2752SN74ALS151DR Datasheet

MFR RecommendedRFQ

SN74ALS251D

Texas InstrumentsIn Stock: 1640SN74ALS251D Datasheet

Parametric EquivalentRFQ

SN74AS151D

Texas InstrumentsIn Stock: 2579SN74AS151D Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the SN74ALS151D are determined by strict equivalence across the following critical parameters: multiplexer circuit configuration (1 x 8:1), package type (16-SOIC), supply voltage range (4.5V ~ 5.5V), output current specifications (2.6mA high, 24mA low), operating temperature range (0°C ~ 70°C), and compliance certifications (ROHS3, REACH Unaffected, EAR99). Parts are grouped into two categories: manufacturer-recommended direct substitutes and parametric equivalents that share identical electrical and mechanical specifications but may differ in series designation or product status.

Parameter Comparison

Engineering Selection Recommendations

The SN74ALS151D has three qualified substitutes, each with distinct advantages based on product lifecycle status and availability:

SN74ALS151DR is the manufacturer-recommended substitute. It maintains identical electrical and mechanical specifications while offering Active product status, ensuring long-term availability and supply chain continuity. The primary difference is packaging format (Tape & Reel versus Tube), which affects procurement and handling but not functional performance.

SN74ALS251D is a parametric equivalent within the same 74ALS logic family. All electrical parameters and package specifications are identical to the SN74ALS151D. However, it carries Last Time Buy status, similar to the original part, limiting its suitability for long-term design solutions.

SN74AS151D is a parametric equivalent from the 74AS logic series. While all critical electrical and mechanical parameters match the SN74ALS151D, this part is classified as Obsolete. Selection of this substitute is not recommended for new designs or ongoing production due to discontinued status and potential supply unavailability.

For new designs and ongoing production requiring guaranteed supply, SN74ALS151DR is the optimal choice. For existing designs currently using SN74ALS151D, SN74ALS251D provides functional equivalence with identical performance characteristics.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS151DR be used as a direct replacement for SN74ALS151D?

A: Yes. SN74ALS151DR is electrically and mechanically identical to SN74ALS151D. The only difference is packaging format: SN74ALS151DR is supplied in Tape & Reel format while SN74ALS151D is supplied in Tube format. Both are 16-SOIC surface mount packages with identical pin configurations and electrical specifications.

Q: What is the difference between SN74ALS151D and SN74ALS251D?

A: Both parts are 1 x 8:1 multiplexers in 16-SOIC packages with identical electrical specifications. The primary difference is the base product number designation (74ALS151 versus 74ALS251). Both share the same supply voltage, output current ratings, operating temperature range, and compliance certifications. They are parametric equivalents suitable for interchangeable use.

Q: Why is SN74AS151D listed as a substitute if it is Obsolete?

A: SN74AS151D is included for reference as a parametric equivalent. All electrical and mechanical parameters match the SN74ALS151D specification. However, Obsolete status indicates this part is no longer manufactured or supported. It should not be selected for new designs or production applications.

Q: Does packaging format affect circuit performance?

A: No. Packaging format (Tube versus Tape & Reel) affects only procurement, storage, and handling procedures. The electrical performance and functional characteristics of the integrated circuit remain identical regardless of packaging format.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitutes—SN74ALS151DR, SN74ALS251D, and SN74AS151D—are ROHS3 compliant and REACH unaffected, matching the compliance status of the original SN74ALS151D.