DM74AS157MX Equivalent & Substitute Parts

Part Overview

The DM74AS157MX 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 design support and production continuity. The part operates with a single supply voltage between 4.5V and 5.5V and is suitable for applications requiring multiplexing of four independent 2:1 data channels.

Substiute Parts

DM74AS157MX

onsemiIn Stock: 933DM74AS157MX Datasheet

Current PartRFQ

SN74AS157D

Texas InstrumentsIn Stock: 1199SN74AS157D Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74AS157MX is determined by strict equivalence across the following critical parameters:

• Circuit configuration: 4 x 2:1 multiplexer topology
• Package type: 16-SOIC surface mount form factor
• Supply voltage range: 4.5V ~ 5.5V single supply operation
• Operating temperature range: 0°C ~ 70°C
• Moisture sensitivity classification: MSL 1 (Unlimited)
• Pin-to-pin compatibility and functional pinout

The SN74AS157D from Texas Instruments satisfies all substitution criteria. Both parts share identical circuit architecture, package specifications, and electrical operating parameters, enabling direct replacement in existing designs.

Parameter Comparison

Engineering Selection Recommendations

The SN74AS157D is the direct functional equivalent for the obsolete DM74AS157MX. Selection of the Texas Instruments part provides the following advantages:

• Active product status ensures continued availability and manufacturing support
• ROHS3 compliance certification meets current environmental and regulatory requirements
• Identical electrical and mechanical specifications guarantee pin-for-pin compatibility
• Equivalent moisture sensitivity classification maintains assembly process compatibility

Both parts carry identical export classification (EAR99) and tariff codes, with no regulatory barriers to substitution.

Frequently Asked Questions (FAQ)

Q: Can the SN74AS157D directly replace the DM74AS157MX without PCB modifications?

A: Yes. Both parts are pin-for-pin compatible with identical 16-SOIC package dimensions, pinout, and electrical specifications. No PCB layout changes are required.

Q: What are the key differences between these parts?

A: The primary difference is product status: the DM74AS157MX is obsolete, while the SN74AS157D is active. The Texas Instruments part also carries ROHS3 compliance certification. Electrical performance and package specifications are equivalent.

Q: Are there any output current differences that affect circuit design?

A: Output current specifications differ between manufacturers (DM74AS157MX: 2mA/20mA; SN74AS157D: 400µA/8mA). Verify that your application's load requirements are compatible with the substitute part's output drive capability before implementation.

Q: Does the moisture sensitivity level affect handling procedures?

A: No. Both parts carry MSL 1 (Unlimited) classification, indicating unlimited shelf life without moisture control requirements. Identical handling and storage procedures apply.

Q: Are there compliance or export restrictions on the SN74AS157D?

A: No. The substitute part carries identical REACH Unaffected status and EAR99 export classification as the original part, with no additional regulatory constraints.