74ACQ374SC Equivalent & Substitute Parts

Part Overview

The 74ACQ374SC 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 is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement continuity. The 20-SOIC package format and core logic specifications remain consistent across available substitute options.

Substiute Parts

74ACQ374SC

onsemiIn Stock: 79774ACQ374SC Datasheet

Current PartRFQ

MC74AC374DWR2G

onsemiIn Stock: 3778MC74AC374DWR2G Datasheet

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MC74AC374DWG

onsemiIn Stock: 984MC74AC374DWG Datasheet

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CD74AC374M

Harris CorporationIn Stock: 2098CD74AC374M Datasheet

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CD74AC374M96

Texas InstrumentsIn Stock: 1428CD74AC374M96 Datasheet

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SN74AC374DW

Texas InstrumentsIn Stock: 1972SN74AC374DW Datasheet

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SN74AC374DWR

Texas InstrumentsIn Stock: 2160SN74AC374DWR Datasheet

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SN74AC374NSR

Texas InstrumentsIn Stock: 4151SN74AC374NSR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACQ374SC is determined by strict alignment with the following critical parameters:

Core Functional Requirements:

• Type: D-Type flip-flop configuration
• Number of Elements: 1
• Number of Bits per Element: 8
• Output Type: Tri-State, Non-Inverted
• Trigger Type: Positive Edge

Electrical Compatibility:

• Voltage - Supply: 2V ~ 6V (minimum requirement)
• Current - Output High, Low: 24mA, 24mA
• Operating Temperature: -40°C ~ 85°C (TA) (minimum requirement)

Physical Compatibility:

• Package / Case: 20-SOIC format
• Mounting Type: Surface Mount

Substitute parts must satisfy all core functional requirements and maintain electrical compatibility within the specified voltage and temperature ranges. Package format must be 20-SOIC to ensure direct board-level compatibility.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitutes (Active Status, ROHS3 Compliant):

MC74AC374DWR2G and MC74AC374DWG are direct functional equivalents manufactured by onsemi with active product status and ROHS3 compliance. Both maintain the 2V ~ 6V supply voltage range and -40°C ~ 85°C operating temperature specification of the original part. MC74AC374DWR2G is supplied in Tape & Reel packaging, while MC74AC374DWG is supplied in Tube packaging.

SN74AC374DWR and SN74AC374DW are Texas Instruments equivalents with active or discontinued status, both offering superior propagation delay performance (8ns versus 8.5ns) and lower quiescent current (4 µA versus 40 µA). Both maintain full electrical and thermal compatibility with the 74ACQ374SC specification.

SN74AC374NSR is a Texas Instruments variant with active status and ROHS3 compliance. This part features a narrower 20-SOIC package (0.209", 5.30mm width) compared to the standard 0.295" width, requiring PCB layout verification before substitution.

Secondary Substitutes (Extended Temperature or Obsolete Status):

CD74AC374M96 is a Texas Instruments part with active status and ROHS3 compliance, offering extended operating temperature range (-55°C ~ 125°C) and lower supply voltage floor (1.5V minimum). Propagation delay is 15.1ns, which exceeds the original specification.

CD74AC374M is a Harris Corporation part with obsolete status and RoHS non-compliance. This part offers extended temperature range (-55°C ~ 125°C) but is not recommended for new designs due to compliance status.

Frequently Asked Questions (FAQ)

Q: Can SN74AC374NSR be used as a direct replacement for 74ACQ374SC?

A: SN74AC374NSR is functionally equivalent but features a narrower 20-SOIC package (0.209" width versus 0.295" width). PCB footprint compatibility must be verified before substitution. All electrical parameters remain compatible.

Q: What is the primary reason for finding substitutes for 74ACQ374SC?

A: The 74ACQ374SC is classified as obsolete. Substitute parts with active product status ensure long-term availability and supply chain continuity.

Q: Are all substitute parts ROHS3 compliant?

A: Most active substitutes are ROHS3 compliant. CD74AC374M is RoHS non-compliant and is not recommended for new designs. Verify compliance requirements for your specific application.

Q: How do propagation delay differences affect circuit performance?

A: The 74ACQ374SC specifies 8.5ns maximum propagation delay at 5V with 50pF load. Substitute parts range from 8ns to 15.1ns. Faster substitutes (SN74AC374DW, SN74AC374DWR at 8ns) improve timing margins. Slower substitutes (CD74AC374M96 at 15.1ns) may require timing analysis verification.

Q: What is the difference between MC74AC374DWR2G and MC74AC374DWG?

A: Both are onsemi 74AC374 variants with identical electrical specifications. MC74AC374DWR2G is supplied in Tape & Reel packaging; MC74AC374DWG is supplied in Tube packaging. Selection depends on procurement and assembly requirements.

Q: Can I use CD74AC374M for new designs?

A: CD74AC374M is obsolete and RoHS non-compliant. It is not recommended for new designs. Use active, ROHS3-compliant alternatives such as MC74AC374DWR2G, SN74AC374DWR, or SN74AC374NSR.

Q: What is the significance of quiescent current differences?

A: The 74ACQ374SC specifies 40 µA quiescent current. Most substitutes operate at 4-8 µA, representing significant power consumption reduction in battery-powered or low-power applications. This is a beneficial characteristic of substitute parts.

Q: Are there package format considerations for substitution?

A: All substitutes use 20-SOIC surface-mount packaging. SN74AC374NSR uses a narrower 0.209" width variant; all others use the standard 0.295" width matching the original part. Verify PCB footprint compatibility before selection.