DM74AS257SJ Equivalent & Substitute Parts

Part Overview

The DM74AS257SJ 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 identification of functionally equivalent alternatives necessary for ongoing system support and new design implementations. The part operates on single supply voltage and is suitable for applications requiring multiplexing of multiple data channels.

Substiute Parts

DM74AS257SJ

onsemiIn Stock: 728DM74AS257SJ Datasheet

Current PartRFQ

SN74AS257NSR

Texas InstrumentsIn Stock: 3690SN74AS257NSR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74AS257SJ is determined by the following critical parameters that must remain constant across equivalent parts:

• Circuit configuration: 4 x 2:1 multiplexer topology
• Package type: 16-SOIC surface mount package with 0.209" width (5.30mm)
• Electrical specifications: Single supply voltage range 4.5V ~ 5.5V
• Output current ratings: 15mA high, 48mA low
• Operating temperature range: 0°C ~ 70°C
• Base product series: 74AS logic family

The SN74AS257NSR from Texas Instruments meets all these substitution criteria and represents a direct functional equivalent with identical electrical and mechanical characteristics.

Parameter Comparison

Engineering Selection Recommendations

The SN74AS257NSR is the direct equivalent substitute for the DM74AS257SJ. Both components share identical electrical specifications, package dimensions, and functional characteristics. The primary distinction is product status: the original DM74AS257SJ is obsolete, while the SN74AS257NSR maintains active production status from Texas Instruments.

Both parts carry equivalent compliance certifications: REACH Unaffected status, EAR99 export classification, and unlimited moisture sensitivity level. The SN74AS257NSR additionally carries RoHS3 compliance certification.

For applications currently using the DM74AS257SJ, direct substitution with the SN74AS257NSR is supported without circuit modification or re-qualification, provided the packaging format (Tape & Reel) is compatible with assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the SN74AS257NSR replace the DM74AS257SJ in existing designs?

A: Yes. Both parts are 4 x 2:1 multiplexers with identical electrical ratings, supply voltage requirements, output current specifications, and operating temperature ranges. The 16-SOIC package dimensions are identical, enabling direct pin-compatible substitution.

Q: What is the difference between the DM74AS257SJ and SN74AS257NSR?

A: The components are functionally equivalent. The DM74AS257SJ (onsemi) is obsolete, while the SN74AS257NSR (Texas Instruments) is in active production. The SN74AS257NSR includes RoHS3 compliance certification. Packaging differs in format: the original uses standard SOP, while the substitute is supplied in Tape & Reel format.

Q: Are there any compatibility concerns with the package change?

A: No compatibility concerns exist for the integrated circuit itself. Both use the 16-SOIC package with identical 0.209" width (5.30mm). The Tape & Reel packaging format of the SN74AS257NSR is a supply format difference only and does not affect electrical or mechanical compatibility.

Q: What compliance certifications apply to both parts?

A: Both the DM74AS257SJ and SN74AS257NSR carry REACH Unaffected status, EAR99 export classification, and unlimited moisture sensitivity level (MSL 1). The SN74AS257NSR additionally meets RoHS3 compliance requirements.

Q: Can I use the SN74AS257NSR in new designs?

A: Yes. The SN74AS257NSR is in active production status and is suitable for new design implementations. It provides the same 4 x 2:1 multiplexer functionality with identical electrical specifications and enhanced compliance certifications compared to the obsolete DM74AS257SJ.