74ABT574CSCX Equivalent & Substitute Parts

Part Overview

The 74ABT574CSCX is a D-type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit capacity and tri-state inverted output configuration. This component operates at 200 MHz clock frequency with 5ns maximum propagation delay in a 20-SOIC surface mount package. The part is currently obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.

Substiute Parts

74ABT574CSCX

onsemiIn Stock: 228474ABT574CSCX Datasheet

Current PartRFQ

SN74ABT574ADWR

Texas InstrumentsIn Stock: 3176SN74ABT574ADWR Datasheet

DirectRFQ

CY74FCT2574ATSOCT

Texas InstrumentsIn Stock: 851CY74FCT2574ATSOCT Datasheet

SimilarRFQ

CY74FCT574TSOC

Texas InstrumentsIn Stock: 2626CY74FCT574TSOC Datasheet

SimilarRFQ

SN74ABT574ADW

Texas InstrumentsIn Stock: 2413SN74ABT574ADW Datasheet

SimilarRFQ

SN74ABT574ANSR

Texas InstrumentsIn Stock: 3182SN74ABT574ANSR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ABT574CSCX is determined by the following critical parameters:

Core Functional Requirements:

• D-Type flip-flop architecture with 1 element and 8-bit capacity
• Positive edge trigger configuration
• Tri-state output capability
• 20-SOIC surface mount package

Electrical Compatibility Parameters:

• Supply voltage range: 4.5V ~ 5.5V (or compatible subset)
• Operating temperature: -40°C ~ 85°C
• Clock frequency: minimum 200 MHz
• Maximum propagation delay: 5ns or better @ 5V, 50pF
• Output current capability: minimum 32mA (high), 64mA (low)

Acceptable Variations:

• Output polarity (inverted vs. non-inverted) requires circuit-level evaluation
• Quiescent current variations within the 74ABT/74FCT logic families
• Input capacitance differences within specified ranges
• Packaging format (Tape & Reel, Tube) does not affect functional compatibility

Substitute parts are classified as direct equivalents when all core functional and electrical parameters align with the main part specifications.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (74ABT Series - Texas Instruments):

SN74ABT574ADWR and SN74ABT574ADW are the preferred direct substitutes for the 74ABT574CSCX. Both parts maintain identical series classification, clock frequency (200 MHz), output current specifications (32mA, 64mA), and supply voltage range (4.5V ~ 5.5V). These parts feature improved propagation delay (4.8ns vs. 5ns) and are currently in active production status with ROHS3 compliance. The primary difference is packaging format: SN74ABT574ADWR is supplied in Tape & Reel format, while SN74ABT574ADW is supplied in Tube format. Both are electrically equivalent.

SN74ABT574ANSR provides functional equivalence with identical electrical performance within the 74ABT series. This part operates at 200 MHz with 6.6ns propagation delay and maintains full compatibility with supply voltage and output current requirements. The package variant (20-SOIC 0.209" width vs. 0.295" width) requires PCB layout verification but does not affect electrical functionality. This part is actively produced and ROHS3 compliant.

Secondary Substitutes (74FCT Series - Texas Instruments):

CY74FCT574TSOC and CY74FCT2574ATSOCT are functionally compatible alternatives from the 74FCT logic family. Both maintain the 8-bit D-type flip-flop architecture with positive edge triggering and tri-state output capability. The 74FCT series operates at higher clock frequencies (250 MHz for CY74FCT2574ATSOCT) and meets the minimum 200 MHz requirement. However, propagation delay specifications (10ns) exceed the main part's 5ns specification. Supply voltage range is narrower (4.75V ~ 5.25V vs. 4.5V ~ 5.5V). CY74FCT574TSOC is currently active; CY74FCT2574ATSOCT is discontinued at DiGi Electronics. Output current for CY74FCT2574ATSOCT (15mA, 12mA) is reduced compared to the main part specification.

Output Polarity Consideration:

All substitute parts feature non-inverted tri-state output, while the main part specifies inverted output. Circuit-level evaluation is required to determine if output inversion is functionally necessary or if the design can accommodate non-inverted logic levels.

Compliance and Production Status:

All active substitute parts (SN74ABT574ADWR, SN74ABT574ADW, SN74ABT574ANSR, CY74FCT574TSOC) are ROHS3 compliant and currently in production. All parts maintain MSL 1 (Unlimited) moisture sensitivity classification. Texas Instruments manufacturing ensures consistent quality and long-term availability compared to the obsolete onsemi part.

Frequently Asked Questions (FAQ)

Q: Can SN74ABT574ADWR directly replace 74ABT574CSCX without circuit modifications?

A: SN74ABT574ADWR is electrically compatible in terms of supply voltage (4.5V ~ 5.5V), operating temperature (-40°C ~ 85°C), clock frequency (200 MHz), and output current (32mA, 64mA). The primary consideration is output polarity: the main part specifies inverted output while SN74ABT574ADWR provides non-inverted output. If the circuit design requires inverted logic levels, additional signal conditioning may be necessary. All other electrical parameters are compatible or superior (4.8ns propagation delay vs. 5ns).

Q: What is the difference between SN74ABT574ADWR and SN74ABT574ADW?

A: Both parts are electrically identical 74ABT series D-type flip-flops with 200 MHz operation and 4.8ns propagation delay. The difference is packaging format: SN74ABT574ADWR is supplied in Tape & Reel (TR) format for automated assembly, while SN74ABT574ADW is supplied in Tube format for manual handling. Select based on assembly process requirements. Electrical performance and pin configuration are identical.

Q: Why do the 74FCT series parts (CY74FCT574TSOC, CY74FCT2574ATSOCT) have longer propagation delays?

A: The 74FCT logic family operates at higher clock frequencies (250 MHz) but exhibits different propagation delay characteristics (10ns) compared to the 74ABT series (5ns). While both families meet the minimum 200 MHz clock frequency requirement, the 74FCT parts are not optimal for timing-critical applications requiring sub-5ns propagation delay. Use 74FCT substitutes only when 74ABT alternatives are unavailable and circuit timing margins accommodate the 10ns delay specification.

Q: Is SN74ABT574ANSR compatible with the standard 20-SOIC package footprint?

A: SN74ABT574ANSR uses a 20-SOIC package with 0.209" width (5.30mm) compared to the main part's 0.295" width (7.50mm). Both are 20-pin SOIC packages with identical pin pitch and electrical connections. PCB footprint verification is required: if the original design uses a standard 20-SOIC footprint, the narrower package variant may not align with the PCB layout. Consult PCB design files and package drawings before substitution.

Q: What is the impact of higher quiescent current in substitute parts?

A: The main part specifies 50 µA quiescent current, while all Texas Instruments substitutes specify 200-250 µA. This 4-5x increase affects power consumption in standby or low-activity states. For battery-powered or power-sensitive applications, calculate total system power budget impact. For standard industrial applications with continuous power supply, this difference is typically negligible. Verify power supply capacity and thermal design if quiescent current is a critical design parameter.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts (SN74ABT574ADWR, SN74ABT574ADW, SN74ABT574ANSR, CY74FCT574TSOC) are ROHS3 compliant. The main part (74ABT574CSCX) does not specify RoHS status. If RoHS compliance is a design requirement, select from the active Texas Instruments parts listed above. CY74FCT2574ATSOCT is also ROHS3 compliant but is discontinued at DiGi Electronics.

Q: Can I use CY74FCT2574ATSOCT if other substitutes are unavailable?

A: CY74FCT2574ATSOCT is functionally compatible but presents several trade-offs: propagation delay is 10ns (vs. 5ns specification), output current is reduced (15mA, 12mA vs. 32mA, 64mA), and supply voltage range is narrower (4.75V ~ 5.25V). The part is discontinued at DiGi Electronics, limiting long-term availability. Use only if circuit timing margins accommodate 10ns delay and output current requirements are reduced. Verify with design team before committing to this substitute.