74AC374PC Equivalent & Substitute Parts

Part Overview

The 74AC374PC is a D-Type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit capacity and tri-state, non-inverted output configuration. This component operates as a standard positive edge-triggered flip-flop in a 20-DIP through-hole package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Substiute Parts

74AC374PC

onsemiIn Stock: 695474AC374PC Datasheet

Current PartRFQ

SN74AC574N

Texas InstrumentsIn Stock: 2731SN74AC574N Datasheet

DirectRFQ

CD74AC374E

Harris CorporationIn Stock: 6299CD74AC374E Datasheet

SimilarRFQ

SN74AC374N

Texas InstrumentsIn Stock: 1986SN74AC374N Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74AC374PC are classified based on strict electrical and mechanical parameter compatibility within the 74AC logic family. The substitution criteria are:

Primary Compatibility 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: 2V ~ 6V minimum overlap
• Maximum propagation delay: 9.5 ns @ 5V, 50pF or better
• Current output capability: 24 mA minimum (both high and low)
• Operating temperature range: -40°C ~ 85°C minimum coverage

Substitute Categories:

Direct Manufacturer Substitute: SN74AC574N (Texas Instruments) — Functionally equivalent with identical electrical specifications and active product status.

Similar Manufacturer Substitute: CD74AC374E (Harris Corporation) — Maintains core D-Type 8-bit flip-flop function with compatible package, though with relaxed performance parameters and obsolete status.

Parametric Equivalent: SN74AC374N (Texas Instruments) — Exact electrical parameter match with active product status and enhanced compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

SN74AC374N (Texas Instruments) is the primary recommended substitute. This part maintains exact electrical parameter equivalence with the 74AC374PC, including identical clock frequency (155 MHz), propagation delay (9.5 ns @ 5V, 50pF), voltage supply range (2V ~ 6V), and output current specifications (24 mA). The part carries active product status, ensuring long-term availability and supply chain continuity. RoHS3 compliance certification supports modern manufacturing and environmental regulatory requirements.

SN74AC574N (Texas Instruments) serves as a direct functional alternative with marginally lower clock frequency (153 MHz) and identical propagation delay performance. This part is also active and RoHS3 compliant. The primary distinction is the base product number (74AC574 versus 74AC374), which may require design verification depending on application-specific requirements.

CD74AC374E (Harris Corporation) is a compatible substitute with relaxed electrical performance parameters. The maximum propagation delay is 10.8 ns (versus 9.5 ns), clock frequency is 125 MHz (versus 155 MHz), and input capacitance is 10 pF (versus 4.5 pF). This part is obsolete and RoHS non-compliant, making it suitable only for legacy system maintenance where performance relaxation is acceptable and regulatory compliance is not required.

Frequently Asked Questions (FAQ)

Q: Can SN74AC374N directly replace 74AC374PC in existing designs?

A: Yes. SN74AC374N maintains identical electrical specifications across all critical parameters: clock frequency (155 MHz), propagation delay (9.5 ns @ 5V, 50pF), voltage supply range (2V ~ 6V), output current (24 mA), and operating temperature range (-40°C ~ 85°C). The 20-DIP through-hole package is mechanically identical. No design modifications are required.

Q: What is the difference between SN74AC374N and SN74AC574N?

A: Both parts are D-Type 8-bit flip-flops in 20-DIP packages with tri-state, non-inverted outputs. The primary difference is the base product number: 74AC374 versus 74AC574. SN74AC574N has a marginally lower clock frequency (153 MHz versus 155 MHz) but maintains the same 9.5 ns propagation delay. Both are active, Texas Instruments products with RoHS3 compliance. Selection depends on whether the specific base product number is required by design documentation.

Q: Is CD74AC374E suitable for new designs?

A: CD74AC374E is not recommended for new designs. The part is obsolete and RoHS non-compliant. Performance parameters are relaxed compared to the 74AC374PC: propagation delay is 10.8 ns (versus 9.5 ns) and clock frequency is 125 MHz (versus 155 MHz). This part is appropriate only for legacy system repairs where the original part number must be maintained and performance relaxation is acceptable.

Q: Are all substitute parts pin-compatible with 74AC374PC?

A: Yes. All substitute parts use the 20-DIP (0.300", 7.62mm) through-hole package with identical pin configuration. Direct socket substitution is possible without PCB modifications.

Q: What compliance certifications should I verify for new production?

A: For new production designs, specify SN74AC374N or SN74AC574N (both Texas Instruments). Both parts carry RoHS3 compliance certification and active product status, meeting modern manufacturing and environmental regulatory requirements. The 74AC374PC and CD74AC374E are obsolete and do not meet current compliance standards.

Q: How do quiescent current differences affect circuit design?

A: The 74AC374PC has a quiescent current of 40 µA, while SN74AC374N and SN74AC574N have 4 µA. This 10-fold reduction in standby current consumption with the Texas Instruments substitutes results in lower power dissipation during idle states. For battery-powered or low-power applications, this represents a significant advantage. For standard AC-powered designs, this difference is typically negligible.