DM74LS157N Equivalent & Substitute Parts

Part Overview

The DM74LS157N 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 and substitute parts necessary for ongoing design support and procurement. The DM74LS157N operates with single supply voltage between 4.75V and 5.25V and is suitable for applications requiring multiplexing functionality in through-hole mounting configurations.

Substiute Parts

DM74LS157N

onsemiIn Stock: 2119DM74LS157N Datasheet

Current PartRFQ

SN74LS157N

Texas InstrumentsIn Stock: 13698SN74LS157N Datasheet

DirectRFQ

SN74LS158N

Texas InstrumentsIn Stock: 2430SN74LS158N Datasheet

Parametric EquivalentRFQ

SN74LS298N

onsemiIn Stock: 20322SN74LS298N Datasheet

Parametric EquivalentRFQ

SN74LS399N

Texas InstrumentsIn Stock: 2735SN74LS399N Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74LS157N is determined by strict electrical and mechanical parameter matching. All substitute parts must maintain identical specifications across the following critical parameters:

• Circuit configuration: 4 x 2:1 multiplexer topology
• Independent circuits: 1
• Package type: 16-DIP (0.300", 7.62mm)
• Mounting type: Through Hole
• Voltage supply range: 4.75V ~ 5.25V
• Output current specifications: 400µA (high), 8mA (low)
• Operating temperature range: 0°C ~ 70°C
• Series classification: 74LS

The substitute parts identified—SN74LS157N, SN74LS158N, SN74LS298N, and SN74LS399N—meet all these electrical and mechanical requirements, enabling direct functional replacement in circuit applications.

Parameter Comparison

Engineering Selection Recommendations

For new designs and ongoing procurement, SN74LS157N, SN74LS158N, and SN74LS399N are preferred substitutes due to their active product status and ROHS3 compliance. These parts are manufactured by Texas Instruments and onsemi, both established suppliers in the 74LS logic family.

SN74LS157N provides the most direct replacement, maintaining identical part number structure and active availability. SN74LS158N and SN74LS399N offer equivalent electrical and mechanical performance with active product status.

SN74LS298N remains available as a parametric equivalent but carries obsolete product status and RoHS non-compliance, making it suitable only for legacy system maintenance where new stock is unavailable.

Frequently Asked Questions (FAQ)

Q: Can SN74LS157N be used as a direct replacement for DM74LS157N?

A: Yes. SN74LS157N meets all electrical and mechanical parameters specified for DM74LS157N, including circuit configuration, package type, voltage supply range, output current specifications, and operating temperature range. The primary difference is manufacturer (Texas Instruments vs. onsemi) and product status (Active vs. Obsolete).

Q: What is the difference between SN74LS157N, SN74LS158N, and SN74LS399N?

A: All three parts share identical electrical specifications and 16-DIP package configuration. The differences are in base product number designation (157, 158, 399) and inventory availability. All three are active products with ROHS3 compliance.

Q: Is the 16-DIP package compatible across all substitute parts?

A: Yes. All substitute parts use the 16-DIP (0.300", 7.62mm) package with through-hole mounting, ensuring mechanical and electrical compatibility in existing PCB designs.

Q: Can I use SN74LS298N as a substitute?

A: SN74LS298N meets all electrical and mechanical parameters and is available in inventory. However, it carries obsolete product status and RoHS non-compliance. Use only when other active alternatives are unavailable.

Q: Are there compliance differences between substitute parts?

A: SN74LS157N, SN74LS158N, and SN74LS399N are ROHS3 compliant. DM74LS157N and SN74LS298N are RoHS non-compliant. For applications requiring RoHS compliance, select from the three active, compliant alternatives.