DM74AS157N Equivalent & Substitute Parts

Part Overview

The DM74AS157N 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 part operates with a single supply voltage between 4.5V and 5.5V and is suitable for applications requiring multiplexing functionality in the 0°C to 70°C operating temperature range.

Substiute Parts

DM74AS157N

onsemiIn Stock: 3264DM74AS157N Datasheet

Current PartRFQ

SN74AS157N

Texas InstrumentsIn Stock: 2119SN74AS157N Datasheet

DirectRFQ

SN74AS298AN

Texas InstrumentsIn Stock: 1160SN74AS298AN Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the DM74AS157N are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Functional Parameters:

• Circuit configuration: 4 x 2:1 multiplexer topology
• Voltage supply range: 4.5V ~ 5.5V
• Operating temperature range: 0°C ~ 70°C
• Independent circuits: 1

Mechanical Parameters:

• Package type: 16-DIP (0.300", 7.62mm)
• Mounting type: Through Hole
• Supplier device package: 16-PDIP

Electrical Parameters:

• Output current specifications (High and Low)
• Single supply voltage source

Two substitute parts meet these criteria: SN74AS157N (direct manufacturer equivalent from Texas Instruments) and SN74AS298AN (parametric equivalent from Texas Instruments with matching output current specifications).

Parameter Comparison

Engineering Selection Recommendations

SN74AS157N (Texas Instruments) is the direct manufacturer equivalent and primary substitute. This part maintains active product status and carries ROHS3 compliance certification. The output current specifications differ from the original (400µA, 8mA versus 2mA, 20mA), requiring circuit-level verification for applications with specific current drive requirements.

SN74AS298AN (Texas Instruments) is the parametric equivalent with matching output current specifications (2mA, 20mA) to the original DM74AS157N. This part also maintains active product status and ROHS3 compliance. The base product number differs (74AS298 versus 74AS157), but functional and mechanical compatibility is maintained within the specified parameters.

Both substitute parts are manufactured by Texas Instruments, carry REACH Unaffected status, and share the same ECCN classification (EAR99) as the original component. Selection between these two substitutes depends on output current requirements for the specific application circuit.

Frequently Asked Questions (FAQ)

Q: Can SN74AS157N directly replace DM74AS157N in existing designs? A: SN74AS157N is mechanically and functionally compatible as a direct substitute. However, the output current specifications differ (400µA, 8mA versus 2mA, 20mA). Circuit verification is required if the application depends on specific output current drive capabilities.

Q: What is the difference between SN74AS157N and SN74AS298AN? A: Both parts are 4 x 2:1 multiplexers in 16-DIP packages with identical voltage supply and operating temperature ranges. The primary difference is output current specifications: SN74AS157N provides 400µA, 8mA while SN74AS298AN provides 2mA, 20mA (matching the original DM74AS157N). The base product numbers also differ (74AS157 versus 74AS298).

Q: Are these substitutes RoHS compliant? A: Both Texas Instruments substitutes (SN74AS157N and SN74AS298AN) are ROHS3 compliant. The original DM74AS157N RoHS status is not specified in the provided data.

Q: Can these parts be used in new production designs? A: Yes. Both substitute parts carry active product status from Texas Instruments, making them suitable for new production designs. The original DM74AS157N is obsolete and should not be used for new designs.

Q: Are there any export restrictions on these parts? A: All three parts share the same ECCN classification (EAR99) and REACH Unaffected status, indicating no additional export restrictions apply to the substitutes.

Q: What package considerations apply to these substitutes? A: All parts use identical 16-DIP (0.300", 7.62mm) packages with through-hole mounting. Direct PCB layout compatibility is maintained across all three parts.