DM74AS257N Equivalent & Substitute Parts

Part Overview

The DM74AS257N is a 4 x 2:1 multiplexer logic integrated circuit manufactured by onsemi in a 16-DIP package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The Texas Instruments SN74AS257N provides a direct parametric equivalent with identical electrical and mechanical specifications while maintaining active product status.

Substiute Parts

DM74AS257N

onsemiIn Stock: 1235DM74AS257N Datasheet

Current PartRFQ

SN74AS257N

Texas InstrumentsIn Stock: 2051SN74AS257N Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74AS257N with the SN74AS257N is valid based on the following matching parameters:

• Identical circuit configuration: 4 x 2:1 multiplexer topology
• Matching output current specifications: 15mA high, 48mA low
• Identical voltage supply range: 4.5V ~ 5.5V
• Identical operating temperature range: 0°C ~ 70°C
• Identical package and pinout: 16-DIP (0.300", 7.62mm)
• Same series classification: 74AS logic family
• Identical supplier device package: 16-PDIP

These parameters establish full electrical and mechanical compatibility between the two parts.

Parameter Comparison

Engineering Selection Recommendations

The SN74AS257N from Texas Instruments is the appropriate substitute for the obsolete DM74AS257N. Both parts maintain identical electrical performance and mechanical compatibility. The SN74AS257N offers the advantage of active product status, ensuring continued availability and manufacturing support. Both parts comply with REACH regulations and carry the same ECCN classification. The Texas Instruments variant is available in tube packaging with 2000 units in stock, providing supply chain reliability for production applications.

Frequently Asked Questions (FAQ)

Q: Can the SN74AS257N directly replace the DM74AS257N in existing designs?

A: Yes. The SN74AS257N provides direct substitution with identical electrical specifications, output current ratings, voltage supply requirements, operating temperature range, and 16-DIP package configuration. No circuit modifications are required.

Q: Are there any differences in compliance or regulatory status between these parts?

A: Both parts maintain REACH Unaffected status and EAR99 ECCN classification. The SN74AS257N carries RoHS3 compliance, while the DM74AS257N does not specify RoHS status. Both parts are suitable for regulated applications.

Q: What is the significance of the product status difference?

A: The DM74AS257N is classified as obsolete, indicating onsemi has discontinued manufacturing. The SN74AS257N maintains active status from Texas Instruments, ensuring long-term availability and manufacturing continuity for new designs and production runs.

Q: Are the pinouts identical between these parts?

A: Yes. Both parts use the 16-DIP (0.300", 7.62mm) package with identical pinout configuration. Through-hole mounting compatibility is maintained.

Q: What packaging options are available for the substitute part?

A: The SN74AS257N is supplied in tube packaging, with 2000 units available in stock. The original DM74AS257N packaging specification is not detailed in the available data.