SN74S280N Equivalent & Substitute Parts

Part Overview

The SN74S280N is a 9-bit parity generator/checker logic integrated circuit manufactured by Texas Instruments in the 74S series. This component is classified as obsolete, making equivalent substitute parts necessary for new designs, maintenance applications, and inventory replenishment where the original part is no longer in production.

The SN74S280N performs parity generation and checking functions across 9-bit data paths, commonly used in digital systems requiring error detection capabilities. As an obsolete product, sourcing alternatives from active product lines ensures design continuity and long-term component availability.

Substiute Parts

SN74S280N

Texas InstrumentsIn Stock: 2863SN74S280N Datasheet

Current PartRFQ

SN74AS280N

Texas InstrumentsIn Stock: 3758SN74AS280N Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74S280N is determined by the following critical parameters:

• Functional Equivalence: Both parts must perform 9-bit parity generation and checking operations
• Package Compatibility: Both parts must use 14-DIP (0.300", 7.62mm) through-hole packaging for direct board-level replacement
• Electrical Interface: Supply voltage ranges and output current specifications must support the application circuit requirements
• Operating Temperature Range: Must meet or exceed the 0°C ~ 70°C operating window
• Compliance Standards: RoHS3 compliance and REACH unaffected status ensure regulatory alignment

The SN74AS280N qualifies as a direct substitute based on these parameters. The 74AS series represents an advanced Schottky variant of the 74S logic family, maintaining functional and pin-level compatibility while offering improved electrical characteristics.

Parameter Comparison

Engineering Selection Recommendations

The SN74AS280N is the qualified substitute for the SN74S280N based on the following engineering criteria:

Product Status: The SN74AS280N maintains active production status, ensuring long-term availability and supply chain reliability compared to the obsolete SN74S280N.

Compliance Alignment: Both parts maintain ROHS3 compliance and REACH unaffected status, satisfying regulatory requirements for new designs and replacements.

Electrical Compatibility: The SN74AS280N operates within a wider supply voltage range (4.5 V ~ 5.5 V versus 4.75 V ~ 5.25 V), providing greater tolerance margins in power distribution systems. Output current specifications (2mA high versus 1mA high) remain within typical logic circuit loading requirements.

Package and Pinout: Identical 14-DIP through-hole packaging ensures direct board-level substitution without layout modifications or rework.

Frequently Asked Questions (FAQ)

Q: Can the SN74AS280N directly replace the SN74S280N on existing PCBs?

A: Yes. Both parts share identical 14-DIP packaging, pinout, and functional specifications for 9-bit parity generation/checking. Direct socket substitution is possible without PCB modifications.

Q: What is the difference between the 74S and 74AS logic families?

A: The 74AS series represents an advanced Schottky variant offering improved speed and power characteristics compared to the standard 74S series. Both families maintain functional compatibility for this parity generator application.

Q: Does the wider supply voltage range of the SN74AS280N affect circuit design?

A: The SN74AS280N's 4.5 V ~ 5.5 V range is a superset of the SN74S280N's 4.75 V ~ 5.25 V range. Existing circuits designed for the SN74S280N operate within the SN74AS280N's specifications without modification.

Q: Are there any thermal or operating temperature considerations?

A: Both parts share identical 0°C ~ 70°C operating temperature ranges. No thermal design changes are required when substituting the SN74AS280N for the SN74S280N.

Q: What compliance certifications apply to the SN74AS280N?

A: The SN74AS280N is ROHS3 compliant and REACH unaffected, matching the regulatory status of the SN74S280N and satisfying current environmental standards.