74ACT574PC Equivalent & Substitute Parts

Part Overview

The 74ACT574PC is a D-Type flip-flop logic integrated circuit with 8-bit capacity, designed for digital signal storage and synchronization applications. Manufactured by onsemi in a 20-DIP through-hole package, this component operates at positive edge trigger with tri-state non-inverted outputs. The part is currently obsolete, making equivalent substitutes necessary for ongoing system maintenance and new designs requiring compatible functionality.

Substiute Parts

74ACT574PC

onsemiIn Stock: 595474ACT574PC Datasheet

Current PartRFQ

SN74ACT374N

Texas InstrumentsIn Stock: 1130SN74ACT374N Datasheet

DirectRFQ

SN74ACT574N

Texas InstrumentsIn Stock: 1629SN74ACT574N Datasheet

DirectRFQ

CD74ACT574E

Harris CorporationIn Stock: 2372CD74ACT574E Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74ACT574PC is determined by strict alignment of the following electrical and mechanical parameters:

Critical Matching Parameters:

• Logic family: 74ACT series
• Package type: 20-DIP (0.300", 7.62mm) through-hole
• Output configuration: Tri-state, non-inverted
• Bit capacity: 8-bit per element
• Trigger type: Positive edge
• Supply voltage range: 4.5V ~ 5.5V
• Operating temperature range: -40°C ~ 85°C minimum

Acceptable Variation Parameters:

• Clock frequency: Equal to or greater than 110 MHz
• Propagation delay: Equal to or less than 11ns @ 5V, 50pF
• Quiescent current: Equal to or less than 40 µA
• Output current: Equal to or greater than 24mA

Substitute parts are classified as direct equivalents when all critical parameters match and acceptable variation parameters remain within specified limits. Parts meeting these criteria maintain functional and electrical compatibility with the original 74ACT574PC in standard applications.

Parameter Comparison

Engineering Selection Recommendations

SN74ACT574N (Texas Instruments) is the primary direct equivalent for the 74ACT574PC. This part maintains identical electrical specifications including clock frequency, propagation delay, and output current ratings. The SN74ACT574N carries active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment for new designs and production systems.

SN74ACT374N (Texas Instruments) functions as a compatible substitute with enhanced performance characteristics. The 160 MHz clock frequency and 10ns propagation delay exceed the original specification, providing operational margin. This part is suitable for applications where improved speed performance is beneficial. ROHS3 compliance and active status support modern manufacturing requirements.

CD74ACT574E (Harris Corporation) provides functional equivalence with extended operating temperature range (-55°C ~ 125°C). This part is obsolete and lacks RoHS compliance. Selection of this substitute is appropriate only for legacy system maintenance where temperature performance requirements exceed standard specifications and component availability is confirmed.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT574N directly replace 74ACT574PC without circuit modification?

A: Yes. The SN74ACT574N maintains identical electrical and mechanical specifications for supply voltage, output configuration, propagation delay, and package type. Direct pin-for-pin substitution is supported in standard applications.

Q: What is the functional difference between SN74ACT574N and SN74ACT374N?

A: Both parts are 8-bit D-Type flip-flops with tri-state outputs in 20-DIP packages. The SN74ACT374N operates at 160 MHz clock frequency versus 110 MHz for the SN74ACT574N, and provides 10ns propagation delay versus 11ns. The SN74ACT374N is suitable for applications requiring higher speed performance.

Q: Is CD74ACT574E recommended for new designs?

A: No. The CD74ACT574E is obsolete and RoHS non-compliant. This part is suitable only for legacy system maintenance where component availability is confirmed and regulatory compliance is not required.

Q: What are the key parameters that determine substitution compatibility?

A: Package type (20-DIP through-hole), supply voltage range (4.5V ~ 5.5V), output configuration (tri-state, non-inverted), and operating temperature range (-40°C ~ 85°C) are critical. Clock frequency and propagation delay must meet or exceed original specifications.

Q: Does quiescent current variation affect substitution suitability?

A: The SN74ACT574N and SN74ACT374N exhibit lower quiescent current (4 µA) compared to the original 74ACT574PC (40 µA). This represents improved power efficiency and does not compromise functional compatibility.

Q: Are there RoHS compliance considerations for substitute selection?

A: Yes. The SN74ACT574N and SN74ACT374N are ROHS3 compliant, supporting modern manufacturing and environmental regulations. The CD74ACT574E is RoHS non-compliant and should not be used in applications requiring regulatory compliance.