74ACQ574PC Equivalent & Substitute Parts

Part Overview

The 74ACQ574PC is a D-Type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit positive edge triggering in a 20-DIP package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity. The part operates across a supply voltage range of 2V to 6V with a maximum propagation delay of 8.5ns at 5V with 50pF load.

Substiute Parts

74ACQ574PC

onsemiIn Stock: 91474ACQ574PC Datasheet

Current PartRFQ

CD74AC574E

Texas InstrumentsIn Stock: 1626CD74AC574E Datasheet

SimilarRFQ

SN74AC574N

Texas InstrumentsIn Stock: 2731SN74AC574N Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74ACQ574PC are selected based on strict electrical and mechanical compatibility criteria. The following parameters must align for valid substitution:

• Functional Type: D-Type flip-flop with 1 element, 8-bit configuration
• Output Configuration: Tri-State, Non-Inverted output
• Trigger Mechanism: Positive Edge triggering
• Package Format: 20-DIP (0.300", 7.62mm) through-hole mounting
• Output Drive Capability: 24mA high and low current
• Supply Voltage Compatibility: Overlapping or extended voltage ranges within acceptable operating margins
• Propagation Delay: Performance within acceptable timing specifications for standard logic applications

Both identified substitutes (CD74AC574E and SN74AC574N) meet these core criteria while offering active product status and improved specifications in certain parameters.

Parameter Comparison

Engineering Selection Recommendations

Both CD74AC574E and SN74AC574N are valid substitutes for the obsolete 74ACQ574PC based on functional and mechanical equivalence. Selection between substitutes should consider the following factors:

CD74AC574E (Texas Instruments)

• Active product status with ongoing manufacturer support
• Extended operating temperature range (-55°C to 125°C) suitable for wider environmental applications
• Lower quiescent current (8 µA) reduces power consumption
• Slightly higher propagation delay (10.8ns) remains acceptable for standard logic timing requirements
• ROHS3 compliant for regulatory compliance

SN74AC574N (Texas Instruments)

• Active product status with ongoing manufacturer support
• Matching operating temperature range (-40°C to 85°C) with the original part
• Lowest quiescent current (4 µA) for minimal standby power draw
• Fastest propagation delay (9.5ns) closest to original specification
• Matching input capacitance (4.5 pF) with the original part
• ROHS3 compliant for regulatory compliance

Both substitutes are REACH Unaffected and classified as EAR99 for export control purposes, matching the original part's compliance profile.

Frequently Asked Questions (FAQ)

Q: Can CD74AC574E and SN74AC574N be used interchangeably with 74ACQ574PC?

A: Both parts are functionally equivalent substitutes. They share identical logic configuration (D-Type flip-flop, 1 element, 8-bit, tri-state non-inverted output, positive edge trigger), identical output drive capability (24mA), and identical 20-DIP package format. Pin-for-pin compatibility is maintained.

Q: What are the key differences between the two substitute options?

A: SN74AC574N offers faster propagation delay (9.5ns vs 10.8ns) and lower quiescent current (4 µA vs 8 µA). CD74AC574E provides extended temperature range (-55°C to 125°C vs -40°C to 85°C). Both are active products with ROHS3 compliance.

Q: Is the voltage supply range difference significant?

A: CD74AC574E operates at 1.5V to 5.5V while SN74AC574N operates at 2V to 6V, matching the original 74ACQ574PC. For applications requiring 2V to 5.5V operation, both are suitable. For applications requiring operation below 1.5V or above 5.5V, verify specific requirements against the substitute datasheet.

Q: Are there any package or mounting differences?

A: All three parts use identical 20-DIP (0.300", 7.62mm) through-hole packaging. Direct board-level substitution is possible without layout modifications.

Q: What is the impact of higher input capacitance in CD74AC574E?

A: CD74AC574E has 10 pF input capacitance compared to 4.5 pF in both the original and SN74AC574N. This may affect circuit timing in applications with high-impedance signal sources or long signal traces. Verify compatibility with your specific circuit design.

Q: Are both substitutes suitable for new designs?

A: Both CD74AC574E and SN74AC574N are active products with full manufacturer support, making them suitable for new designs. The original 74ACQ574PC is obsolete and should not be used in new designs.