DM74AS158N Equivalent & Substitute Parts

Part Overview

The DM74AS158N 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 through-hole mounting applications in logic circuit designs.

Substiute Parts

DM74AS158N

onsemiIn Stock: 1190DM74AS158N Datasheet

Current PartRFQ

SN74AS158N

Texas InstrumentsIn Stock: 2065SN74AS158N Datasheet

DirectRFQ

SN74AS298AN

Texas InstrumentsIn Stock: 1160SN74AS298AN Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DM74AS158N is determined by strict equivalence in the following parameters:

• Circuit configuration: 4 x 2:1 multiplexer topology
• Package type: 16-DIP (0.300", 7.62mm)
• Mounting method: Through hole
• Supply voltage range: 4.5V ~ 5.5V
• Operating temperature range: 0°C ~ 70°C
• Series classification: 74AS logic family

Two substitute parts meet these criteria. The SN74AS158N from Texas Instruments is a direct manufacturer equivalent with identical electrical specifications. The SN74AS298AN from Texas Instruments is a parametric equivalent that maintains the same output current ratings (2mA, 20mA) as the original DM74AS158N, ensuring functional compatibility in applications where these current levels are specified.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring direct replacement of the DM74AS158N, the SN74AS158N from Texas Instruments serves as the primary equivalent. Both parts are classified within the 74AS logic family and share identical package, voltage, and temperature specifications. The SN74AS158N carries active product status and ROHS3 compliance, supporting long-term availability and regulatory requirements.

The SN74AS298AN from Texas Instruments is suitable as an alternative where the output current specifications of 2mA (high) and 20mA (low) are critical design parameters. This part maintains parametric equivalence with the original DM74AS158N in these current ratings while offering active product status and ROHS3 compliance.

Both Texas Instruments substitutes are REACH unaffected and carry the same ECCN and HTSUS classifications as the original part, ensuring regulatory consistency.

Frequently Asked Questions (FAQ)

Q: Can the SN74AS158N directly replace the DM74AS158N?

A: Yes. The SN74AS158N is a direct manufacturer equivalent with identical circuit configuration (4 x 2:1 multiplexer), package type (16-DIP), voltage supply range (4.5V ~ 5.5V), and operating temperature range (0°C ~ 70°C). Both parts are pin-compatible and functionally equivalent.

Q: What is the difference between the SN74AS158N and SN74AS298AN?

A: Both are 4 x 2:1 multiplexers in 16-DIP packages with identical voltage and temperature specifications. The primary difference is output current capability. The SN74AS158N provides 400µA (high) and 8mA (low), while the SN74AS298AN provides 2mA (high) and 20mA (low). Select based on your circuit's current requirements.

Q: Are both substitute parts RoHS compliant?

A: Yes. Both the SN74AS158N and SN74AS298AN are ROHS3 compliant, meeting current environmental and regulatory standards.

Q: Can I use these substitutes in existing PCB designs without modification?

A: Yes. Both substitute parts use the same 16-DIP (0.300", 7.62mm) through-hole package as the DM74AS158N, allowing direct board-level replacement without PCB redesign.

Q: Why is the DM74AS158N listed as obsolete?

A: The DM74AS158N has been discontinued by onsemi. The active equivalents from Texas Instruments (SN74AS158N and SN74AS298AN) provide continued access to this multiplexer function with modern compliance certifications and ongoing manufacturing support.