DM74AS157M Equivalent & Substitute Parts

Part Overview

The DM74AS157M 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 equivalent and substitute parts essential for design continuity and procurement planning. The part operates with a single supply voltage between 4.5V and 5.5V and is suitable for applications requiring multiplexing functionality across four independent 2:1 channels within the 0°C to 70°C operating temperature range.

Substiute Parts

DM74AS157M

onsemiIn Stock: 1170DM74AS157M Datasheet

Current PartRFQ

SN74AS157D

Texas InstrumentsIn Stock: 1199SN74AS157D Datasheet

DirectRFQ

SN74AS298AD

Texas InstrumentsIn Stock: 811SN74AS298AD Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DM74AS157M is determined by strict adherence to the following electrical and mechanical parameters:

Critical Matching Parameters:

• Circuit configuration: 4 x 2:1 multiplexer
• Package type: 16-SOIC with identical physical dimensions (0.154", 3.90mm Width)
• Voltage supply range: 4.5V ~ 5.5V
• Operating temperature range: 0°C ~ 70°C
• Mounting type: Surface Mount
• Moisture sensitivity level: 1 (Unlimited)

Substitution Categories:

Direct Manufacturer Equivalent: SN74AS157D (Texas Instruments) — Identical circuit configuration and package specifications with active product status.

Parametric Equivalent: SN74AS298AD (Texas Instruments) — Matches all critical electrical parameters including output current specifications (2mA, 20mA) and package requirements, though based on the 74AS298 base product number rather than 74AS157.

Parameter Comparison

Engineering Selection Recommendations

SN74AS157D (Texas Instruments) is the primary direct equivalent for the obsolete DM74AS157M. Both parts share identical circuit configuration, package specifications, and operating parameters. The SN74AS157D carries active product status and ROHS3 compliance, providing long-term availability and regulatory alignment. The output current specification differs (400µA, 8mA versus 2mA, 20mA), which may require circuit validation depending on load requirements.

SN74AS298AD (Texas Instruments) serves as a parametric equivalent with matching output current specifications (2mA, 20mA) and identical package geometry. This part maintains active product status and ROHS3 compliance. Selection between SN74AS157D and SN74AS298AD depends on whether the 74AS157 or 74AS298 base product line is preferred for the application.

Both substitute parts are REACH Unaffected and carry identical moisture sensitivity ratings, ensuring compatibility with existing supply chain and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can SN74AS157D be used as a direct replacement for DM74AS157M?

A: Yes. Both parts feature identical 4 x 2:1 multiplexer configuration, 16-SOIC package dimensions, voltage supply range (4.5V ~ 5.5V), and operating temperature specifications (0°C ~ 70°C). The SN74AS157D is manufactured by Texas Instruments and maintains active product status.

Q: What is the difference between SN74AS157D and SN74AS298AD?

A: Both are 4 x 2:1 multiplexers in 16-SOIC packages with identical voltage and temperature specifications. The primary difference is the output current rating: SN74AS157D provides 400µA high and 8mA low, while SN74AS298AD provides 2mA high and 20mA low, matching the original DM74AS157M specification. The base product numbers differ (74AS157 versus 74AS298).

Q: Are both substitute parts RoHS compliant?

A: Yes. Both SN74AS157D and SN74AS298AD are ROHS3 compliant and REACH Unaffected, meeting current regulatory requirements for electronic components.

Q: Does package compatibility guarantee functional interchangeability?

A: Package compatibility (16-SOIC with identical dimensions) combined with matching circuit configuration (4 x 2:1), voltage supply range, and operating temperature range establishes functional interchangeability. Output current specifications must be verified against circuit load requirements.

Q: What is the moisture sensitivity level for substitute parts?

A: Both SN74AS157D and SN74AS298AD carry Moisture Sensitivity Level 1 (Unlimited), identical to the original DM74AS157M, requiring no changes to handling or storage protocols.