DM74LS251N Equivalent & Substitute Parts

Part Overview

The DM74LS251N is a 1 x 8:1 multiplexer logic integrated circuit manufactured by onsemi in a 16-DIP through-hole package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations. The part operates on single supply voltage and is suitable for digital logic applications requiring multiplexing functionality.

Substiute Parts

DM74LS251N

onsemiIn Stock: 2109DM74LS251N Datasheet

Current PartRFQ

SN74LS251N

onsemiIn Stock: 4353SN74LS251N Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the DM74LS251N is determined by strict equivalence across the following critical parameters:

• Circuit Configuration: 1 x 8:1 multiplexer topology
• Package Type: 16-DIP (0.300", 7.62mm) through-hole package
• Voltage Supply Range: 4.75V ~ 5.25V single supply
• Operating Temperature Range: 0°C ~ 70°C
• Series Classification: 74LS logic family

The SN74LS251N qualifies as a direct substitute based on identical circuit configuration, package specification, voltage supply range, and operating temperature range. Both parts share the same base product number (74LS251) and are manufactured by onsemi within the same logic series.

Parameter Comparison

Engineering Selection Recommendations

The SN74LS251N is a direct functional equivalent to the DM74LS251N. Both parts are obsolete products from onsemi within the 74LS logic family. Selection between these parts should be based on:

• Availability: SN74LS251N has higher inventory (4,300 pcs) compared to DM74LS251N (2,090 pcs)
• Output Current Specification: SN74LS251N has reduced output low current (8mA vs. 24mA). Applications requiring the full 24mA output low current should verify compatibility with the reduced specification
• Compliance Status: DM74LS251N lists REACH Unaffected status; SN74LS251N is RoHS non-compliant. Regulatory requirements should determine selection for new designs or regulated applications
• Regulatory Requirements: Both parts carry identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications

Frequently Asked Questions (FAQ)

Q: Can SN74LS251N replace DM74LS251N in existing designs?

A: Yes, for applications where output low current of 8mA is sufficient. If the original design requires 24mA output low current, functional compatibility must be verified before substitution.

Q: Are the package dimensions identical?

A: Yes. Both parts use 16-DIP (0.300", 7.62mm) through-hole packages with identical pin configurations and mechanical specifications.

Q: What is the difference in output current specifications?

A: DM74LS251N specifies 24mA output low current, while SN74LS251N specifies 8mA output low current. Both maintain 2.6mA output high current. Circuit designs dependent on the higher output low current must be evaluated for compatibility.

Q: Are there compliance differences between these parts?

A: DM74LS251N is REACH Unaffected; SN74LS251N is RoHS non-compliant. Applications subject to RoHS or REACH regulations should select accordingly.

Q: Do both parts operate at the same voltage and temperature ranges?

A: Yes. Both parts operate at 4.75V ~ 5.25V supply voltage and 0°C ~ 70°C operating temperature range.

Q: Which part should I select for new designs?

A: Selection should be based on output current requirements, regulatory compliance needs, and availability. Both parts are obsolete; long-term availability should be confirmed with the supplier before committing to production designs.