74ACQ374SCX Equivalent & Substitute Parts

Part Overview

The 74ACQ374SCX is a single-element D-type flip-flop logic integrated circuit with 8-bit positive edge triggering, manufactured by onsemi in a 20-SOIC surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The part operates across a 2V to 6V supply range with a maximum propagation delay of 8.5ns at 5V with 50pF load.

Substiute Parts

74ACQ374SCX

onsemiIn Stock: 83874ACQ374SCX Datasheet

Current PartRFQ

MC74AC374DWR2G

onsemiIn Stock: 3778MC74AC374DWR2G Datasheet

DirectRFQ

CD74AC374M

Harris CorporationIn Stock: 2098CD74AC374M Datasheet

SimilarRFQ

CD74AC374M96

Texas InstrumentsIn Stock: 1428CD74AC374M96 Datasheet

SimilarRFQ

MC74AC374DWG

onsemiIn Stock: 984MC74AC374DWG Datasheet

SimilarRFQ

SN74AC374DW

Texas InstrumentsIn Stock: 1972SN74AC374DW Datasheet

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SN74AC374DWR

Texas InstrumentsIn Stock: 2160SN74AC374DWR Datasheet

SimilarRFQ

SN74AC374NSR

Texas InstrumentsIn Stock: 4151SN74AC374NSR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74ACQ374SCX is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Parameters:

• Function: D-Type flip-flop with 1 element, 8-bit configuration
• Output Type: Tri-State, Non-Inverted
• Trigger Type: Positive Edge
• Package: 20-SOIC surface mount
• Voltage Supply Range: Minimum 2V to 6V compatibility
• Current Output Capability: 24mA high and low
• Operating Temperature: -40°C to 85°C minimum

Substitute Classification:

Direct Substitutes maintain all critical electrical parameters within the specified ranges and are pin-compatible in the same package footprint:

• MC74AC374DWR2G (onsemi, Active status)
• MC74AC374DWG (onsemi, Active status)
• SN74AC374DW (Texas Instruments, Discontinued at DiGi Electronics)
• SN74AC374DWR (Texas Instruments, Active status)

Similar Substitutes meet core functional requirements but have variations in secondary parameters such as quiescent current, propagation delay, or operating temperature range:

• CD74AC374M (Harris Corporation, Obsolete status)
• CD74AC374M96 (Texas Instruments, Active status)
• SN74AC374NSR (Texas Instruments, Active status, narrower package width variant)

Parameter Comparison

Engineering Selection Recommendations

Preferred Direct Substitutes (Active Status, Full Compatibility):

SN74AC374DWR and SN74AC374DW from Texas Instruments are the primary substitutes. Both maintain the 2V to 6V supply range, deliver equivalent or superior propagation delay performance (8ns versus 8.5ns), and are ROHS3 compliant. SN74AC374DWR carries Active product status with ongoing manufacturer support. Both parts are pin-compatible in the 20-SOIC (0.295", 7.50mm) package.

MC74AC374DWR2G and MC74AC374DWG from onsemi are secondary direct substitutes with Active status. These parts operate within the same voltage and package specifications. The primary trade-off is slightly higher propagation delay (9.5ns) and higher quiescent current (8µA versus 4µA in the Texas Instruments variants), though both remain within acceptable operating margins for most applications.

Alternative Substitutes (Extended Operating Range):

CD74AC374M96 from Texas Instruments is suitable for applications requiring extended operating temperature range (-55°C to 125°C) and broader voltage tolerance (1.5V to 5.5V). This part carries Active status and ROHS3 compliance. The trade-off is increased propagation delay (15.1ns), which may impact timing-critical designs.

Not Recommended:

CD74AC374M (Harris Corporation) is obsolete and RoHS non-compliant, offering no advantage over active alternatives. SN74AC374NSR features a narrower package variant (0.209" width versus 0.295"), which may require PCB layout modifications and is suitable only for space-constrained applications where the narrower footprint is a specific requirement.

Frequently Asked Questions (FAQ)

Q: Can I use SN74AC374NSR as a direct replacement for 74ACQ374SCX?

A: SN74AC374NSR is functionally equivalent but uses a narrower 20-SOIC package (0.209" width versus 0.295"). While electrically compatible, the different package width requires PCB footprint verification. Use only if your design accommodates the narrower package or if you can modify the PCB layout.

Q: What is the difference between MC74AC374DWR2G and MC74AC374DWG?

A: Both parts are electrically identical with identical electrical specifications. The difference is packaging format: MC74AC374DWR2G is supplied in Tape & Reel (TR), while MC74AC374DWG is supplied in Tube. Select based on your procurement and assembly requirements.

Q: Is the 74ACQ374SCX obsolete, and what are my options?

A: Yes, the 74ACQ374SCX is classified as obsolete. SN74AC374DWR (Texas Instruments, Active) is the recommended substitute, offering superior performance with lower quiescent current and equivalent propagation delay in the same package.

Q: Can I use CD74AC374M96 in a design originally specified for 74ACQ374SCX?

A: CD74AC374M96 is functionally compatible but has a higher propagation delay (15.1ns versus 8.5ns). Use this part only if your circuit timing allows for the increased delay. The extended operating temperature range (-55°C to 125°C) and broader voltage tolerance (1.5V to 5.5V) may be beneficial for harsh environment applications.

Q: What does ROHS3 compliance mean for my procurement?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. All recommended active substitutes are ROHS3 compliant. The obsolete 74ACQ374SCX and CD74AC374M do not carry this certification.

Q: Are all substitute parts pin-compatible with the original 74ACQ374SCX?

A: All listed substitutes maintain identical pin configuration and function. However, SN74AC374NSR uses a narrower package width, which may require PCB layout verification. All other substitutes are direct pin-for-pin replacements in the standard 20-SOIC (0.295", 7.50mm) package.