DM74S51N Equivalent & Substitute Parts

Part Overview

The DM74S51N is a dual AND/OR/INVERT gate logic IC manufactured by onsemi, housed in a 14-pin DIP package. This component implements two configurable logic circuits with 8 total inputs (2, 2, 2, 2 configuration) and single-ended outputs. The DM74S51N is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing system support and component procurement.

Substiute Parts

DM74S51N

onsemiIn Stock: 3313DM74S51N Datasheet

Current PartRFQ

SN74S51N

Texas InstrumentsIn Stock: 2507SN74S51N Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM74S51N is determined by strict equivalence across the following parameters:

• Logic function: AND/OR/INVERT gate configuration
• Circuit count: 2 circuits
• Input configuration: 8 inputs (2, 2, 2, 2)
• Output characteristics: Single-ended output type
• Electrical performance: Output current (1mA high, 20mA low) and supply voltage (4.75V ~ 5.25V)
• Operating temperature range: 0°C ~ 70°C
• Physical form factor: 14-DIP through-hole package (0.300", 7.62mm)
• Logic series: 74S family

The SN74S51N from Texas Instruments meets all these criteria and is classified as an active product, providing direct functional and pin-compatible substitution.

Parameter Comparison

Engineering Selection Recommendations

The SN74S51N is the direct equivalent for the obsolete DM74S51N. Both components share identical electrical specifications, logic function, and physical packaging. The SN74S51N is currently in active production status, ensuring availability for new procurement and system maintenance.

The SN74S51N carries ROHS3 compliance certification, meeting modern environmental and regulatory requirements. Both parts maintain REACH Unaffected status and EAR99 export classification.

Selection of the SN74S51N eliminates obsolescence risk while maintaining full functional and pin-level compatibility with existing circuit designs using the DM74S51N.

Frequently Asked Questions (FAQ)

Q: Can the SN74S51N directly replace the DM74S51N in existing designs?

A: Yes. The SN74S51N is pin-compatible and electrically equivalent. Both components implement the same AND/OR/INVERT logic function with identical input/output configurations, supply voltage requirements, and operating temperature range. Direct substitution requires no circuit modifications.

Q: Are there package differences between these parts?

A: Both the DM74S51N and SN74S51N use the 14-DIP (0.300", 7.62mm) through-hole package. Physical dimensions and pin assignments are identical, permitting direct board-level substitution.

Q: What is the significance of the DM74S51N being obsolete?

A: Obsolete status indicates the DM74S51N is no longer manufactured by onsemi. The SN74S51N, maintained in active production by Texas Instruments, provides continuity for applications requiring this logic function and ensures long-term component availability.

Q: Do compliance certifications differ between these parts?

A: The SN74S51N carries ROHS3 compliance certification. Both parts maintain REACH Unaffected status and EAR99 export classification. The SN74S51N meets current environmental and regulatory standards for new system designs and procurement.

Q: Are the electrical characteristics identical?

A: Yes. Both parts specify identical output current (1mA high, 20mA low), supply voltage range (4.75V ~ 5.25V), and operating temperature range (0°C ~ 70°C). Logic function, circuit count, and input configuration are also identical.