74ACT574SC Equivalent & Substitute Parts

Part Overview

The 74ACT574SC is a D-type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit capacity and tri-state, non-inverted output configuration. This component operates at a clock frequency of 110 MHz with a maximum propagation delay of 11ns at 5V with 50pF load. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

Substiute Parts

74ACT574SC

onsemiIn Stock: 178274ACT574SC Datasheet

Current PartRFQ

MC74ACT574DWR2G

onsemiIn Stock: 2111MC74ACT574DWR2G Datasheet

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MC74ACT574DWG

onsemiIn Stock: 2128MC74ACT574DWG Datasheet

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SN74ACT374DW

Texas InstrumentsIn Stock: 3404SN74ACT374DW Datasheet

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SN74ACT574DW

Texas InstrumentsIn Stock: 2264SN74ACT574DW Datasheet

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SN74ACT574DWR

Texas InstrumentsIn Stock: 18738SN74ACT574DWR Datasheet

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CD74ACT574M

Texas InstrumentsIn Stock: 3513CD74ACT574M Datasheet

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CD74ACT574M96

Texas InstrumentsIn Stock: 50372CD74ACT574M96 Datasheet

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SN74ACT574NSR

Texas InstrumentsIn Stock: 4218SN74ACT574NSR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ACT574SC are selected based on strict electrical and mechanical compatibility criteria. The primary substitution parameters are:

Critical Matching Parameters:

• D-Type flip-flop configuration with 1 element and 8-bit capacity
• Tri-state, non-inverted output type
• Positive edge trigger mechanism
• 20-SOIC package form factor (0.295", 7.50mm Width)
• Voltage supply range of 4.5V ~ 5.5V
• Operating temperature range of -40°C ~ 85°C
• Surface mount mounting type

Performance Parameters (Allowable Variation):

• Clock frequency: 100 MHz minimum (74ACT574SC operates at 110 MHz)
• Maximum propagation delay: 11ns or better at 5V, 50pF load
• Output current capability: 24mA minimum for both high and low states
• Quiescent current: Varies across substitutes (4 µA to 40 µA)
• Input capacitance: 4.5 pF to 10 pF

Substitute parts maintain functional equivalence through identical logic architecture, package compatibility, and electrical performance within specified tolerances. Parts with improved performance characteristics (lower propagation delay, reduced quiescent current) are direct substitutes without design modification requirements.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Recommended for New Designs):

SN74ACT574DWR (Texas Instruments) is the preferred substitute. This part maintains identical electrical specifications to the 74ACT574SC with matching clock frequency (110 MHz) and propagation delay (11ns). The part carries Active product status with ROHS3 compliance and demonstrates superior availability (18,709 units in stock). The quiescent current is reduced to 4 µA compared to the original 40 µA, providing improved power efficiency without functional impact.

MC74ACT574DWR2G and MC74ACT574DWG (onsemi) provide direct functional equivalence with Active product status and ROHS3 compliance. Both parts operate at 100 MHz with identical 11ns propagation delay. The reduced quiescent current (8 µA) and improved availability make these suitable alternatives. Packaging differs only in delivery format (Tape & Reel versus Tube).

Extended Temperature Range Alternative:

CD74ACT574M96 (Texas Instruments) offers extended operating temperature range (-55°C ~ 125°C) compared to the standard -40°C ~ 85°C specification. This part maintains 110 MHz clock frequency and 11.2ns propagation delay with Active product status and ROHS3 compliance. The higher input capacitance (10 pF versus 4.5 pF) remains within acceptable design margins for most applications.

Package Variant:

SN74ACT574NSR (Texas Instruments) provides identical electrical performance with a narrower 20-SOIC package (0.209", 5.30mm Width versus 0.295", 7.50mm Width). This variant is suitable only for designs with compatible PCB layouts and is not interchangeable with standard-width packages without physical modification.

Parts to Avoid:

SN74ACT374DW (Texas Instruments) is classified as Last Time Buy and represents a different base product number (74ACT374 versus 74ACT574), indicating functional differences despite similar packaging. CD74ACT574M (Texas Instruments) is obsolete and should not be selected for new procurement.

Frequently Asked Questions (FAQ)

Q: Can I use SN74ACT574DWR as a direct replacement for 74ACT574SC without design changes?

A: Yes. SN74ACT574DWR maintains identical electrical specifications including clock frequency (110 MHz), propagation delay (11ns at 5V, 50pF), output current (24mA), voltage supply range (4.5V ~ 5.5V), and operating temperature (-40°C ~ 85°C). The 20-SOIC package dimensions are identical. The reduced quiescent current (4 µA versus 40 µA) provides improved power efficiency without requiring circuit modifications.

Q: What is the difference between MC74ACT574DWR2G and MC74ACT574DWG?

A: Both parts are manufactured by onsemi with identical electrical specifications. The difference is packaging format: MC74ACT574DWR2G is supplied in Tape & Reel format, while MC74ACT574DWG is supplied in Tube format. Electrical performance and component functionality are equivalent. Selection depends on assembly process requirements and procurement preferences.

Q: Why does CD74ACT574M96 have a higher input capacitance (10 pF) than other substitutes?

A: CD74ACT574M96 is specified with 10 pF input capacitance compared to 4.5 pF for most other substitutes. This parameter is provided in the component specifications and does not prevent functional substitution. The higher capacitance may affect circuit timing in applications with very tight timing margins, but remains compatible with standard 74ACT logic designs.

Q: Is SN74ACT574NSR compatible with designs using standard 20-SOIC packages?

A: SN74ACT574NSR uses a narrower 20-SOIC package (0.209", 5.30mm Width) compared to the standard 20-SOIC (0.295", 7.50mm Width) used by 74ACT574SC and most substitutes. Physical PCB footprints are not compatible. This variant is suitable only for designs with compatible layouts and cannot be used as a direct drop-in replacement without PCB modification.

Q: What is the significance of ROHS3 compliance on substitute parts?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements. All active substitute parts listed carry ROHS3 compliance, confirming environmental and regulatory conformance for modern manufacturing and end-of-life disposal. The original 74ACT574SC does not specify RoHS status, while all recommended substitutes provide this certification.

Q: Can I use SN74ACT374DW as a substitute for 74ACT574SC?

A: No. Although SN74ACT374DW shares the same 20-SOIC package and 74ACT series designation, it is based on the 74ACT374 product line, not 74ACT574. These represent different functional architectures and are not interchangeable. The part number difference (374 versus 574) indicates distinct logic configurations.

Q: Which substitute offers the best performance improvement?

A: SN74ACT374DW provides the highest clock frequency (160 MHz) and fastest propagation delay (8.5ns), representing significant performance improvement over the 74ACT574SC (110 MHz, 11ns). However, this part carries Last Time Buy status and is based on a different product line (74ACT374). For active, long-term availability with performance improvement, SN74ACT574DWR offers reduced quiescent current (4 µA versus 40 µA) with identical timing specifications.