74AC174SCX Equivalent & Substitute Parts

Part Overview

The 74AC174SCX is a D-Type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 6 bits per element in a 16-SOIC surface mount package. This component functions as a master reset flip-flop with positive edge triggering and non-inverted outputs. The part is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and procurement planning.

Substiute Parts

74AC174SCX

onsemiIn Stock: 160574AC174SCX Datasheet

Current PartRFQ

CD74AC174M96

Texas InstrumentsIn Stock: 1134CD74AC174M96 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74AC174SCX is determined by the following critical parameters that must align across candidate parts:

• Logic Function: D-Type flip-flop with 1 element, 6 bits per element, master reset capability
• Package Compatibility: 16-SOIC (0.154", 3.90mm Width) surface mount package
• Series Classification: 74AC logic family
• Trigger Mechanism: Positive edge triggering
• Output Configuration: Non-inverted outputs
• Current Output Capability: 24mA high and low output current

The CD74AC174M96 manufactured by Texas Instruments meets these core substitution criteria. Both parts share identical functional architecture, package form factor, and output drive specifications. The substitute maintains the same logic family designation and pin-compatible 16-SOIC package, enabling direct replacement in existing PCB layouts.

Parameter Comparison

Engineering Selection Recommendations

The CD74AC174M96 from Texas Instruments is the qualified substitute for the obsolete 74AC174SCX. The Texas Instruments part carries active product status, ensuring continued availability and manufacturing support. Both components are REACH unaffected and classified under ECCN EAR99, maintaining equivalent regulatory compliance.

The CD74AC174M96 demonstrates superior quiescent current performance (8 µA versus 40 µA) and extended operating temperature range (-55°C to 125°C versus -40°C to 85°C). The substitute operates across a slightly lower minimum supply voltage (1.5V versus 2V). Clock frequency and propagation delay specifications differ; the substitute operates at 95 MHz with 14.6ns maximum propagation delay compared to the original part's 125 MHz and 8.5ns specifications. These performance variations must be evaluated against specific application timing requirements.

The CD74AC174M96 is supplied in Tape & Reel packaging format, whereas the original part packaging format is not specified. Both components maintain identical 16-SOIC package geometry and pin configuration, ensuring mechanical and electrical compatibility in existing designs.

Frequently Asked Questions (FAQ)

Q: Can the CD74AC174M96 directly replace the 74AC174SCX in existing designs?

A: Yes. Both parts share identical logic function, pin configuration, and 16-SOIC package form factor. Direct PCB replacement is mechanically and electrically feasible. Application-specific timing requirements must be evaluated due to differences in clock frequency and propagation delay specifications.

Q: What are the key differences between these parts?

A: The primary differences are product status (obsolete versus active), quiescent current consumption (40 µA versus 8 µA), operating temperature range (-40°C to 85°C versus -55°C to 125°C), clock frequency (125 MHz versus 95 MHz), and propagation delay (8.5ns versus 14.6ns). Supply voltage range differs slightly (2V-6V versus 1.5V-5.5V).

Q: Are there packaging considerations for substitution?

A: Both parts use the 16-SOIC (0.154", 3.90mm Width) surface mount package with identical pin assignments. The CD74AC174M96 is supplied in Tape & Reel format. No PCB layout modifications are required for package compatibility.

Q: Does the CD74AC174M96 meet the same regulatory requirements?

A: Yes. Both parts are REACH unaffected, classified under ECCN EAR99, and carry MSL 1 (Unlimited) moisture sensitivity rating. Regulatory compliance is equivalent.

Q: Should propagation delay differences affect my selection?

A: Application timing specifications must be reviewed. The CD74AC174M96 exhibits 14.6ns maximum propagation delay at 5V with 50pF load, compared to 8.5ns for the original part. If system timing margins accommodate this 5ns difference, substitution is valid. If timing is critical, detailed circuit analysis is required.