74ACQ574SC Equivalent & Substitute Parts

Part Overview

The 74ACQ574SC is a single-element D-type flip-flop with 8-bit positive edge triggering, manufactured by onsemi in a 20-SOIC surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production requirements. The 74ACQ574SC operates across a 2V to 6V supply range with a maximum propagation delay of 8.5ns at 5V with 50pF load, delivering 24mA output current capability in both high and low states.

Substiute Parts

74ACQ574SC

onsemiIn Stock: 223474ACQ574SC Datasheet

Current PartRFQ

MC74AC574DWG

onsemiIn Stock: 2608MC74AC574DWG Datasheet

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MC74AC574DWR2G

onsemiIn Stock: 2232MC74AC574DWR2G Datasheet

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CD74AC574M96

Texas InstrumentsIn Stock: 2823CD74AC574M96 Datasheet

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SN74AC574DWR

Texas InstrumentsIn Stock: 3871SN74AC574DWR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74ACQ574SC is determined by the following critical parameters:

Functional Equivalence: All substitute parts maintain the same D-type flip-flop architecture with 1 element, 8-bit configuration, positive edge triggering, tri-state non-inverted output, and 20-SOIC package footprint.

Electrical Compatibility: Substitute parts must support the same supply voltage range (2V ~ 6V minimum), maintain compatible output current specifications (24mA), and preserve pin-to-pin compatibility within the 20-SOIC package.

Performance Tolerance: Propagation delay and clock frequency variations are acceptable within the logic family specifications. Quiescent current differences are permissible as long as the part operates within the defined supply voltage and temperature ranges.

Product Status Consideration: Active product status substitutes are preferred over obsolete parts for new designs and long-term availability assurance.

Parameter Comparison

Engineering Selection Recommendations

For Direct Replacement (Preferred): SN74AC574DWR and CD74AC574M96 are recommended as primary substitutes. Both parts are active products with ROHS3 compliance and MSL-1 rating, ensuring long-term availability and environmental compliance. SN74AC574DWR offers superior performance with 6ns propagation delay and 153 MHz clock frequency. CD74AC574M96 provides extended operating temperature range (-55°C ~ 125°C) and lower supply voltage floor (1.5V), suitable for broader application requirements.

For onsemi Ecosystem Continuity: MC74AC574DWR2G and MC74AC574DWG maintain manufacturer continuity within the onsemi product line. Both are active products with ROHS3 compliance. MC74AC574DWR2G is available in Cut Tape and Digi-Reel packaging, while MC74AC574DWG is supplied in Tube packaging. These parts operate within the same voltage and temperature specifications as the original 74ACQ574SC.

Compliance Considerations: All substitute parts carry REACH Unaffected status and EAR99 ECCN classification, matching the regulatory profile of the original component. ROHS3 compliance is standard across all active substitutes, supporting modern manufacturing and environmental requirements.

Frequently Asked Questions (FAQ)

Q: Can I use SN74AC574DWR as a direct replacement for 74ACQ574SC?

A: Yes. Both parts share identical pin configuration in the 20-SOIC package, equivalent output current specifications (24mA), and compatible supply voltage range (2V ~ 6V). SN74AC574DWR offers improved performance with faster propagation delay (6ns vs 8.5ns) and higher clock frequency (153 MHz vs 90 MHz), making it functionally superior for the same application.

Q: What is the difference between MC74AC574DWG and MC74AC574DWR2G?

A: Both parts are electrically identical onsemi 74AC574 variants with the same performance specifications. The primary difference is packaging: MC74AC574DWG is supplied in Tube packaging, while MC74AC574DWR2G is available in Cut Tape and Digi-Reel format. Selection depends on procurement and assembly requirements.

Q: Does CD74AC574M96 work in applications requiring -40°C to 85°C operation?

A: Yes. CD74AC574M96 supports an extended operating temperature range of -55°C to 125°C, which encompasses the -40°C to 85°C requirement of the original 74ACQ574SC. This part is suitable for both standard and extended temperature applications.

Q: Are there supply voltage compatibility concerns with these substitutes?

A: All substitute parts operate within or exceed the 2V ~ 6V supply range of the 74ACQ574SC. CD74AC574M96 has a lower minimum supply voltage (1.5V), which is compatible with 2V ~ 6V applications. No supply voltage incompatibilities exist among the listed substitutes.

Q: What is the significance of MSL rating differences?

A: The 74ACQ574SC carries MSL-1 (Unlimited), while MC74AC574DWG and MC74AC574DWR2G carry MSL-3 (168 Hours). MSL-3 parts require moisture control during storage and have a 168-hour floor life after bag opening. For applications with extended shelf storage or high-humidity environments, MSL-1 parts (SN74AC574DWR, CD74AC574M96) are preferred.

Q: Can I substitute based on clock frequency alone?

A: No. While clock frequency indicates performance capability, substitution must be based on the complete electrical and mechanical parameter set: package compatibility, output current, supply voltage range, operating temperature, and pin configuration. All listed substitutes meet these comprehensive requirements.