DM74AS257MX Equivalent & Substitute Parts

Part Overview

The DM74AS257MX 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 essential for ongoing system support and new design implementations. The part operates with single supply voltage between 4.5V and 5.5V, delivering output currents of 15mA (high) and 48mA (low) across its four independent multiplexer circuits.

Substiute Parts

DM74AS257MX

onsemiIn Stock: 1206DM74AS257MX Datasheet

Current PartRFQ

SN74AS257D

Texas InstrumentsIn Stock: 899SN74AS257D Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74AS257MX is determined by strict equivalence across the following critical parameters:

• Circuit Configuration: 4 x 2:1 multiplexer topology
• Package Type: 16-SOIC surface mount package with 0.154" (3.90mm) width
• Electrical Specifications: Single supply voltage range 4.5V ~ 5.5V, output current ratings 15mA (high) and 48mA (low)
• Operating Temperature Range: 0°C ~ 70°C
• Functional Classification: Logic multiplexer with one independent circuit

The SN74AS257D from Texas Instruments meets all specified parameters and qualifies as a direct substitute. This part maintains identical circuit configuration, package geometry, electrical performance, and operating conditions.

Parameter Comparison

Engineering Selection Recommendations

The SN74AS257D represents the appropriate substitute for the obsolete DM74AS257MX. The Texas Instruments part maintains active product status, ensuring continued availability and manufacturing support. Both components share identical electrical specifications, package geometry, and functional characteristics, enabling direct replacement without circuit modification.

The SN74AS257D carries RoHS3 compliance certification, providing environmental regulatory alignment for new designs and system upgrades. Both parts maintain REACH unaffected status and EAR99 export classification. The identical Moisture Sensitivity Level (MSL 1 - Unlimited) ensures equivalent handling and storage requirements.

Frequently Asked Questions (FAQ)

Q: Can the SN74AS257D replace the DM74AS257MX in existing designs?

A: Yes. The SN74AS257D is a direct functional and electrical equivalent. Both parts feature identical 4 x 2:1 multiplexer configuration, 16-SOIC package dimensions, voltage supply range (4.5V ~ 5.5V), output current specifications (15mA high / 48mA low), and operating temperature range (0°C ~ 70°C). No circuit modifications are required.

Q: Are there any compliance differences between these parts?

A: The SN74AS257D carries RoHS3 compliance certification, while the DM74AS257MX is obsolete. Both maintain REACH unaffected status and identical Moisture Sensitivity Level (MSL 1). For new designs, the SN74AS257D provides superior regulatory alignment.

Q: What is the significance of the 16-SOIC package specification?

A: The 16-SOIC (0.154", 3.90mm Width) package defines the physical footprint and pin configuration. Both the DM74AS257MX and SN74AS257D use this identical package, ensuring PCB layout compatibility and direct socket substitution.

Q: Why is the DM74AS257MX listed as obsolete?

A: Obsolete status indicates the manufacturer (onsemi) has discontinued production. The SN74AS257D from Texas Instruments provides continued availability through active manufacturing and distribution channels.

Q: Are the output current ratings identical?

A: Yes. Both parts deliver 15mA output current (high state) and 48mA output current (low state), maintaining identical drive capability for downstream logic circuits.