74AC574PC Equivalent & Substitute Parts

Part Overview

The 74AC574PC 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 and substitute parts necessary for ongoing system support and new designs. The 74AC series provides standard logic functionality with tri-state, non-inverted outputs suitable for digital signal storage and bus interface applications.

Substiute Parts

74AC574PC

onsemiIn Stock: 119974AC574PC Datasheet

Current PartRFQ

SN74AC374N

Texas InstrumentsIn Stock: 1986SN74AC374N Datasheet

DirectRFQ

CD74AC574E

Texas InstrumentsIn Stock: 1626CD74AC574E Datasheet

SimilarRFQ

SN74AC574N

Texas InstrumentsIn Stock: 2731SN74AC574N Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74AC574PC is determined by strict alignment of electrical and mechanical parameters within the 74AC logic series. The following criteria establish valid substitution relationships:

Critical Matching Parameters:

• D-Type flip-flop architecture with 1 element, 8-bit configuration
• Tri-state, non-inverted output type
• Positive edge trigger mechanism
• 20-DIP through-hole package (0.300", 7.62mm)
• Voltage supply range compatibility (minimum 2V ~ 6V overlap required)
• Output current capability (24 mA minimum for both high and low states)
• Operating temperature range (minimum -40°C ~ 85°C overlap required)

Substitute Categories:

Parametric Equivalent: SN74AC574N matches all critical electrical parameters including clock frequency (153 MHz), propagation delay (9.5 ns @ 5V, 50pF), voltage supply (2V ~ 6V), and operating temperature range (-40°C ~ 85°C). This part is manufactured by Texas Instruments and maintains active product status.

Direct Manufacturer Equivalent: SN74AC374N is functionally equivalent with identical package, output type, and trigger mechanism. Clock frequency is 155 MHz (within acceptable range), propagation delay is 9.5 ns @ 5V, 50pF, and voltage supply is 2V ~ 6V. Manufactured by Texas Instruments with active status.

Similar Equivalent: CD74AC574E maintains the same base product number (74AC574) and package configuration. Clock frequency is 125 MHz, propagation delay is 10.8 ns @ 5V, 50pF, and voltage supply range is 1.5V ~ 5.5V. Operating temperature extends to -55°C ~ 125°C. Manufactured by Texas Instruments with active status.

Parameter Comparison

Engineering Selection Recommendations

SN74AC574N is the primary substitute for 74AC574PC applications. This Texas Instruments part maintains identical electrical specifications including clock frequency (153 MHz), propagation delay (9.5 ns @ 5V, 50pF), voltage supply range (2V ~ 6V), and operating temperature (-40°C ~ 85°C). Active product status ensures long-term availability and supply chain continuity. ROHS3 compliance and REACH unaffected status meet current regulatory requirements.

SN74AC374N serves as a direct functional equivalent with marginally higher clock frequency (155 MHz) and identical propagation delay. This part is suitable for applications where the base product number difference (74AC374 vs. 74AC574) does not create functional conflicts. Active status and full compliance certifications apply.

CD74AC574E provides extended operating temperature range (-55°C ~ 125°C) and lower supply voltage floor (1.5V), making it suitable for applications requiring wider environmental tolerance. Propagation delay increases to 10.8 ns @ 5V, 50pF, and input capacitance increases to 10 pF. This part is appropriate only when extended temperature or lower voltage operation is required.

All substitute parts maintain through-hole 20-DIP package compatibility, tri-state non-inverted output configuration, and positive edge trigger mechanism. Selection should prioritize SN74AC574N for direct replacement in existing designs.

Frequently Asked Questions (FAQ)

Q: Can SN74AC574N directly replace 74AC574PC in existing PCB designs?

A: Yes. SN74AC574N is a parametric equivalent with identical package footprint (20-DIP, 0.300" spacing), pin configuration, and electrical specifications. No PCB modifications are required. The part is pin-compatible and functionally equivalent for all standard applications.

Q: What is the difference between SN74AC574N and SN74AC374N?

A: Both parts are D-Type flip-flops in 20-DIP packages with identical propagation delay (9.5 ns @ 5V, 50pF) and output current (24 mA). The primary difference is the base product number: 74AC574 versus 74AC374. SN74AC374N has a marginally higher clock frequency (155 MHz vs. 153 MHz). Selection depends on whether the specific base product number is required by system design or documentation.

Q: Is CD74AC574E suitable as a substitute for 74AC574PC?

A: CD74AC574E is functionally compatible but with performance trade-offs. Propagation delay increases to 10.8 ns (vs. 9.5 ns), and input capacitance increases to 10 pF (vs. 4.5 pF). The part is suitable only if extended operating temperature (-55°C ~ 125°C) or lower supply voltage (1.5V minimum) is required. For standard -40°C ~ 85°C, 2V ~ 6V applications, SN74AC574N is preferred.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. SN74AC574N, SN74AC374N, and CD74AC574E are all ROHS3 compliant. The original 74AC574PC does not specify RoHS status. All substitute parts maintain REACH unaffected status.

Q: What is the quiescent current difference between 74AC574PC and the substitutes?

A: The original 74AC574PC has quiescent current of 40 µA. SN74AC574N and SN74AC374N reduce this to 4 µA, and CD74AC574E to 8 µA. Lower quiescent current in substitutes reduces standby power consumption. This is a beneficial characteristic and does not affect functional compatibility.

Q: Can these parts be used interchangeably in high-speed applications?

A: SN74AC574N and SN74AC374N maintain the 9.5 ns propagation delay and are suitable for applications up to 153-155 MHz. CD74AC574E has 10.8 ns propagation delay and is limited to 125 MHz operation. Selection depends on system clock frequency requirements.

Q: What packaging options are available for these substitutes?

A: All substitute parts are supplied in 20-DIP through-hole packages (0.300", 7.62mm). No surface-mount alternatives are provided in this substitution group. Packaging is identical across all parts.