74ACT74PC Equivalent & Substitute Parts

Part Overview

The 74ACT74PC is a dual D-type flip-flop logic integrated circuit manufactured by onsemi, housed in a 14-DIP package. This component functions as a 2-element D-type flip-flop with complementary outputs, set/preset and reset capabilities, and positive edge triggering. The 74ACT74PC is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Substiute Parts

74ACT74PC

onsemiIn Stock: 194074ACT74PC Datasheet

Current PartRFQ

74ACT11074N

Texas InstrumentsIn Stock: 108874ACT11074N Datasheet

DirectRFQ

SN74ACT74N

Texas InstrumentsIn Stock: 2151SN74ACT74N Datasheet

DirectRFQ

CD74ACT74E

Harris CorporationIn Stock: 1950CD74ACT74E Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACT74PC is determined by strict adherence to the following parameters:

Critical Matching Parameters:

• Logic function: Dual D-type flip-flop with set/preset and reset
• Output type: Complementary
• Trigger type: Positive edge
• Package type: 14-DIP (0.300", 7.62mm)
• Mounting type: Through hole
• Voltage supply range: 4.5V ~ 5.5V
• Operating temperature range: -40°C ~ 85°C minimum

Allowable Variation Parameters:

• Clock frequency: May differ from 210 MHz
• Propagation delay: May differ from 11ns @ 5V, 50pF
• Quiescent current: May differ from 20 µA
• Input capacitance: May differ from 4.5 pF
• Output current: Must remain 24mA, 24mA

The substitute parts listed below meet all critical matching parameters and are therefore functionally interchangeable in applications designed for the 74ACT74PC.

Parameter Comparison

Engineering Selection Recommendations

SN74ACT74N (Texas Instruments) - Direct Equivalent

The SN74ACT74N is the primary substitute for the 74ACT74PC. It maintains identical clock frequency (210 MHz) and propagation delay (11ns @ 5V, 50pF) specifications. The part is in active production status, ensuring long-term availability. It carries ROHS3 compliance certification and demonstrates lower quiescent current (2 µA) compared to the original part. This substitute is suitable for direct replacement in all applications originally designed for the 74ACT74PC.

74ACT11074N (Texas Instruments) - Performance-Enhanced Substitute

The 74ACT11074N provides faster propagation delay (8.5ns @ 5V, 50pF) and lower quiescent current (4 µA) than the original part. Clock frequency is reduced to 125 MHz, which remains adequate for most standard logic applications. This part is in active production and ROHS3 compliant. Selection of this substitute is appropriate when improved timing performance is beneficial and the reduced clock frequency specification does not conflict with application requirements.

CD74ACT74E (Harris Corporation) - Legacy Substitute

The CD74ACT74E is classified as obsolete and carries RoHS non-compliance status. While it meets the critical functional and package parameters, its obsolete status and regulatory non-compliance make it unsuitable for new designs or long-term procurement strategies. This part may be considered only for legacy system maintenance where no other alternatives are available.

Frequently Asked Questions (FAQ)

Q: Can the SN74ACT74N replace the 74ACT74PC in existing designs?

A: Yes. The SN74ACT74N is a direct equivalent meeting all critical parameters: dual D-type flip-flop function, complementary outputs, positive edge triggering, 14-DIP package, 4.5V–5.5V supply voltage, and -40°C to 85°C operating temperature range. Pin configuration and electrical characteristics are identical.

Q: What is the difference between the SN74ACT74N and 74ACT11074N?

A: Both are Texas Instruments 74ACT series D-type flip-flops in 14-DIP packages. The 74ACT11074N offers faster propagation delay (8.5ns vs. 11ns) and lower quiescent current (4 µA vs. 2 µA). Clock frequency is lower on the 74ACT11074N (125 MHz vs. 210 MHz). Selection depends on timing requirements of the specific application.

Q: Why is the 74ACT74PC listed as obsolete?

A: The 74ACT74PC is an onsemi product that has been discontinued. Active production alternatives from Texas Instruments (SN74ACT74N and 74ACT11074N) are available to support ongoing design and procurement needs.

Q: Are there RoHS compliance differences between substitutes?

A: Yes. The SN74ACT74N and 74ACT11074N are both ROHS3 compliant. The CD74ACT74E is RoHS non-compliant. For applications requiring RoHS compliance, only the Texas Instruments substitutes are suitable.

Q: Can the CD74ACT74E be used as a substitute?

A: The CD74ACT74E meets functional and package requirements but is obsolete and RoHS non-compliant. It is not recommended for new designs or standard procurement. Use only in legacy system maintenance scenarios where no alternatives are available.

Q: What is the impact of different quiescent current specifications?

A: Quiescent current affects power consumption during idle states. The SN74ACT74N (2 µA) and 74ACT11074N (4 µA) consume less power than the original 74ACT74PC (20 µA). This difference is typically negligible in most applications but may be significant in battery-powered or low-power designs.

Q: Are all substitutes pin-compatible with the 74ACT74PC?

A: Yes. All listed substitutes use the 14-DIP package with identical pin assignments. Direct socket replacement is possible without circuit modification.