DM74ALS257MX Equivalent & Substitute Parts

Part Overview

The DM74ALS257MX is a 4 x 2:1 multiplexer logic integrated circuit manufactured by onsemi in a 16-SOIC surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The DM74ALS257MX operates with a single supply voltage between 4.5V and 5.5V and is suitable for applications requiring multiplexing functionality in the 74ALS logic family.

Substiute Parts

DM74ALS257MX

onsemiIn Stock: 1675DM74ALS257MX Datasheet

Current PartRFQ

SN74ALS257AD

Texas InstrumentsIn Stock: 1275SN74ALS257AD Datasheet

DirectRFQ

SN74ALS257ADR

Texas InstrumentsIn Stock: 3708SN74ALS257ADR Datasheet

Parametric EquivalentRFQ

SN74ALS258ADR

Texas InstrumentsIn Stock: 848SN74ALS258ADR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DM74ALS257MX is determined by strict equivalence across the following parameters:

• Circuit configuration: 4 x 2:1 multiplexer
• Package type: 16-SOIC surface mount
• Voltage supply range: 4.5V ~ 5.5V
• Output current specifications: 2.6mA (high), 24mA (low)
• Operating temperature range: 0°C ~ 70°C
• Logic family: 74ALS series

Substitute parts must maintain identical electrical characteristics and physical package dimensions to ensure direct replacement capability. The following parts meet these criteria.

Parameter Comparison

Engineering Selection Recommendations

SN74ALS257ADR (Texas Instruments) is the primary substitute for the DM74ALS257MX. This part is currently active in production, ROHS3 compliant, and available in tape and reel packaging. It maintains full electrical and mechanical equivalence with the original component.

SN74ALS257AD (Texas Instruments) is a secondary option with last time buy status, supplied in tube packaging. This part is electrically equivalent but has limited future availability.

SN74ALS258ADR (Texas Instruments) is a parametric equivalent with identical electrical specifications and package dimensions. However, this part is discontinued at DiGi Electronics and should be considered only when primary substitutes are unavailable.

Frequently Asked Questions (FAQ)

Q: Can SN74ALS257ADR directly replace DM74ALS257MX in existing designs?

A: Yes. The SN74ALS257ADR maintains identical electrical parameters, package dimensions, and pin configuration. No circuit modifications are required for direct substitution.

Q: What is the difference between SN74ALS257AD and SN74ALS257ADR?

A: Both parts are electrically identical 4 x 2:1 multiplexers with matching specifications. The primary difference is packaging: SN74ALS257AD is supplied in tube format, while SN74ALS257ADR is supplied in tape and reel format. SN74ALS257ADR is recommended for automated assembly processes.

Q: Is SN74ALS258ADR compatible with designs using DM74ALS257MX?

A: SN74ALS258ADR is a parametric equivalent with identical electrical characteristics and package specifications. However, verify the base product number (74ALS258 versus 74ALS257) against your circuit design documentation to confirm functional compatibility.

Q: What are the compliance certifications for substitute parts?

A: All Texas Instruments substitutes (SN74ALS257AD, SN74ALS257ADR, SN74ALS258ADR) are ROHS3 compliant and REACH unaffected. Moisture sensitivity level is 1 (unlimited) for all parts.

Q: Which substitute part should be selected for new production designs?

A: SN74ALS257ADR is the recommended choice for new production. This part is active in production status, ROHS3 compliant, and available in standard tape and reel packaging suitable for high-volume manufacturing.