74F280SCX Parity Generator/Checker - Equivalent & Substitute Parts

Part Overview

The 74F280SCX is a 9-bit parity generator/checker logic integrated circuit manufactured by onsemi in a 14-SOIC surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and production continuity. The 74F280 series performs parallel parity generation and checking functions across 9-bit data paths, commonly used in data integrity applications requiring real-time parity computation.

Substiute Parts

74F280SCX

onsemiIn Stock: 3379974F280SCX Datasheet

Current PartRFQ

SN74F280BD

Texas InstrumentsIn Stock: 2131SN74F280BD Datasheet

SimilarRFQ

SN74F280BDR

Texas InstrumentsIn Stock: 3683SN74F280BDR Datasheet

SimilarRFQ

SN74F280BNSR

Texas InstrumentsIn Stock: 2976SN74F280BNSR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74F280SCX are qualified based on the following critical parameters that determine functional and mechanical compatibility:

• Logic Function: All substitutes must perform identical 9-bit parity generation/checker operations
• Electrical Specifications: Supply voltage range (4.5 V ~ 5.5 V), output current ratings (1 mA / 20 mA), and operating temperature (0°C ~ 70°C) must match exactly
• Package Compatibility: Primary substitutes maintain the 14-SOIC (0.154", 3.90mm width) form factor for direct board-level replacement
• Series Designation: All qualified substitutes belong to the 74F logic family
• Environmental Compliance: REACH unaffected status and EAR99 classification maintained across all substitutes

Three substitute parts meet these criteria with variations in manufacturer, product status, and packaging format.

Parameter Comparison

Engineering Selection Recommendations

SN74F280BDR (Texas Instruments) is the primary recommended substitute for new designs and production applications. This part maintains active product status, ensuring long-term availability and supply chain stability. It provides ROHS3 compliance and is supplied in Tape & Reel format, which is standard for automated assembly processes. The 14-SOIC (0.154", 3.90mm) package enables direct board-level replacement without layout modifications.

SN74F280BD (Texas Instruments) serves as an alternative for applications where tube packaging is preferred or required. This part carries Last Time Buy status, indicating limited future availability. It maintains identical electrical and mechanical specifications to the primary recommendation but should be considered only when supply constraints or specific procurement requirements necessitate its selection.

SN74F280BNSR (Texas Instruments) is functionally equivalent but features a wider 14-SOIC package (0.209", 5.30mm width). This variant is suitable only for designs where the larger package footprint is accommodated in the PCB layout. Selection of this part requires verification that the increased package width does not conflict with existing board routing or component placement constraints.

Frequently Asked Questions (FAQ)

Q: Can SN74F280BDR directly replace 74F280SCX on existing PCBs?

A: Yes. The SN74F280BDR maintains identical electrical specifications (4.5 V ~ 5.5 V supply, 1 mA / 20 mA output current, 0°C ~ 70°C operating range) and the same 14-SOIC (0.154", 3.90mm) package footprint. No board modifications are required for direct substitution.

Q: What is the difference between SN74F280BD and SN74F280BDR?

A: Both parts are manufactured by Texas Instruments with identical electrical and mechanical specifications. The primary difference is packaging format: SN74F280BD is supplied in tubes, while SN74F280BDR is supplied in Tape & Reel format. Tape & Reel is standard for high-volume automated assembly.

Q: Why is SN74F280BNSR listed as a substitute if the package is larger?

A: SN74F280BNSR maintains all critical electrical parameters and logic function but uses a wider 14-SOIC package (0.209", 5.30mm versus 0.154", 3.90mm). It qualifies as a functional substitute only for designs where the larger footprint can be accommodated. PCB layout verification is required before selection.

Q: What does "Last Time Buy" status mean for SN74F280BD?

A: Last Time Buy indicates that Texas Instruments has announced the end of production for this part. Existing inventory may be available, but future procurement cannot be guaranteed. For new designs, SN74F280BDR (Active status) is the preferred choice.

Q: Are all substitutes ROHS3 compliant?

A: Yes. SN74F280BD, SN74F280BDR, and SN74F280BNSR are all ROHS3 compliant. The original 74F280SCX RoHS status was not specified in available documentation.

Q: Can these parts be used interchangeably in the same design?

A: SN74F280BD and SN74F280BDR are fully interchangeable electrically and mechanically. SN74F280BNSR is electrically equivalent but requires PCB layout verification due to its larger package width. All three maintain the required 9-bit parity generation/checker function and electrical operating parameters.