DM74LS257BN Equivalent & Substitute Parts

Part Overview

The DM74LS257BN 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 system maintenance, repairs, and legacy design support. The part operates on single supply voltage and is designed for through-hole mounting applications.

Substiute Parts

DM74LS257BN

onsemiIn Stock: 3698DM74LS257BN Datasheet

Current PartRFQ

SN74LS257BN

onsemiIn Stock: 2292SN74LS257BN Datasheet

DirectRFQ

SN74LS258BN

onsemiIn Stock: 16312SN74LS258BN Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DM74LS257BN is determined by strict equivalence across the following critical parameters:

• Circuit configuration (4 x 2:1 multiplexer)
• Package type (16-DIP with 0.300" pitch, 7.62mm)
• Mounting method (through hole)
• Voltage supply range (4.75V ~ 5.25V)
• Output current specifications (2.6mA high, 24mA low)
• Operating temperature range (0°C ~ 70°C)
• Series classification (74LS logic family)

Two substitute parts meet these criteria: SN74LS257BN (direct manufacturer equivalent) and SN74LS258BN (parametric equivalent with identical electrical and mechanical specifications).

Parameter Comparison

Engineering Selection Recommendations

Both substitute parts are functionally equivalent to the DM74LS257BN based on electrical and mechanical parameters. Selection between SN74LS257BN and SN74LS258BN should be based on availability and compliance requirements:

SN74LS257BN is a direct manufacturer equivalent with identical part number structure, offering the closest match for legacy system replacement.

SN74LS258BN is a parametric equivalent with identical electrical and mechanical specifications, providing an alternative source when the direct equivalent is unavailable. Both parts share obsolete product status and non-compliant RoHS classification.

Frequently Asked Questions (FAQ)

Q: Can SN74LS257BN and SN74LS258BN be used interchangeably with DM74LS257BN?

A: Yes. Both substitute parts meet all critical electrical and mechanical parameters: identical 4 x 2:1 circuit configuration, 16-DIP package dimensions, voltage supply range, output current specifications, and operating temperature range.

Q: Are there package differences between these parts?

A: No. All three parts use the same 16-DIP (0.300", 7.62mm) through-hole package, ensuring direct PCB compatibility without layout modifications.

Q: What is the difference between a direct equivalent and a parametric equivalent?

A: SN74LS257BN is a direct manufacturer equivalent with matching part number structure. SN74LS258BN is a parametric equivalent with a different base product number (74LS258 vs 74LS257) but identical electrical and mechanical specifications for this application.

Q: Are these parts still in production?

A: No. All three parts are classified as obsolete. Inventory availability varies by supplier and distributor.

Q: Do compliance certifications differ between these parts?

A: Both substitute parts share the same compliance status as the original: RoHS non-compliant, REACH unaffected, and EAR99 classification.