74AC280SCX Equivalent & Substitute Parts

Part Overview

The 74AC280SCX is a 9-bit parity generator/checker logic IC manufactured by onsemi in a 14-SOIC surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The 74AC280 series provides parity generation and checking functionality for digital systems requiring error detection in 9-bit data paths.

Substiute Parts

74AC280SCX

onsemiIn Stock: 357374AC280SCX Datasheet

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CD74AC280M

Texas InstrumentsIn Stock: 1578CD74AC280M Datasheet

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CD74AC280M96

Texas InstrumentsIn Stock: 2560CD74AC280M96 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74AC280SCX is determined by the following critical parameters:

• Logic function: Parity Generator/Checker with 9-bit capability
• Package compatibility: 14-SOIC form factor with identical 0.154" (3.90mm) width
• Output current rating: 24mA high and low
• Supply voltage range: Must accommodate the original 2 V ~ 6 V specification
• Mounting type: Surface mount configuration

The CD74AC280M and CD74AC280M96 from Texas Instruments meet these core substitution criteria. Both devices maintain the same logic function, pin count, package geometry, and output drive capability. Differences in supply voltage range, operating temperature, and product status do not prevent functional substitution when application requirements fall within the overlapping specifications.

Parameter Comparison

Engineering Selection Recommendations

For new designs and ongoing procurement, CD74AC280M96 is the preferred substitute. This device carries Active product status from Texas Instruments, ensuring long-term availability and manufacturing support. It is ROHS3 compliant and maintains the same functional and electrical characteristics as the obsolete 74AC280SCX within the overlapping supply voltage range of 1.5 V ~ 5.5 V.

CD74AC280M is available as a secondary option with Last Time Buy status, suitable for applications where extended temperature range (-55°C ~ 125°C) is required beyond the original specification.

Both Texas Instruments alternatives are pin-compatible and functionally equivalent for 9-bit parity generation and checking applications. The 14-SOIC package geometry is identical, permitting direct board-level substitution without layout modification.

Frequently Asked Questions (FAQ)

Q: Can CD74AC280M96 directly replace 74AC280SCX on existing PCBs?

A: Yes. Both devices use the 14-SOIC package with identical pin assignments and mechanical dimensions (0.154" width). No PCB layout changes are required for substitution.

Q: What is the difference between CD74AC280M and CD74AC280M96?

A: The primary difference is packaging format. CD74AC280M is supplied in Tube packaging, while CD74AC280M96 is supplied in Tape & Reel (TR) format. Electrically and functionally, both are identical. CD74AC280M96 has Active product status, while CD74AC280M is Last Time Buy.

Q: Is the supply voltage range difference significant?

A: The 74AC280SCX operates from 2 V ~ 6 V, while both Texas Instruments substitutes operate from 1.5 V ~ 5.5 V. The overlapping range is 2 V ~ 5.5 V. Applications operating within this overlapping range experience no functional difference. Applications requiring operation below 1.5 V or above 5.5 V must remain on the original part.

Q: Are the substitute parts RoHS compliant?

A: Yes. Both CD74AC280M and CD74AC280M96 are ROHS3 compliant. The original 74AC280SCX RoHS status is not specified in the provided data.

Q: Which substitute should be selected for new production?

A: CD74AC280M96 is recommended for new production due to its Active product status, ensuring continued availability and manufacturing support from Texas Instruments.