74ACQ373SCX D-Type Transparent Latch Equivalent & Substitute Parts

Part Overview

The 74ACQ373SCX is a D-Type Transparent Latch IC manufactured by onsemi, featuring 1 channel with 8:8 circuit configuration and tri-state output capability in a 20-SOIC package. This part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The 74ACQ373SCX operates across a 2V to 6V supply voltage range with a propagation delay of 5.5ns and supports output currents of 24mA for both high and low states across an operating temperature range of -40°C to 85°C.

Substiute Parts

74ACQ373SCX

onsemiIn Stock: 444474ACQ373SCX Datasheet

Current PartRFQ

MC74AC373DWG

onsemiIn Stock: 2053MC74AC373DWG Datasheet

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CD74AC373M

Harris CorporationIn Stock: 1937CD74AC373M Datasheet

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CD74AC373M96

Texas InstrumentsIn Stock: 1905CD74AC373M96 Datasheet

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SN74AC373DW

Texas InstrumentsIn Stock: 2420SN74AC373DW Datasheet

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SN74AC373DWR

Texas InstrumentsIn Stock: 4416SN74AC373DWR Datasheet

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SN74AC373MDWREP

Texas InstrumentsIn Stock: 746SN74AC373MDWREP Datasheet

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SN74AC373NSR

Texas InstrumentsIn Stock: 2896SN74AC373NSR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACQ373SCX is determined by the following critical parameters:

• Logic Type & Circuit Configuration: All substitute parts must be D-Type Transparent Latch ICs with 8:8 circuit configuration
• Output Type: Tri-state output capability is required
• Package / Case: 20-SOIC form factor is the primary mechanical constraint
• Electrical Compatibility: Supply voltage range, output current ratings, and propagation delay characteristics must support the original application requirements
• Mounting Type: Surface mount technology must be maintained

Substitute parts are grouped into two categories based on electrical performance characteristics:

Group A (Extended Performance): Parts with supply voltage range 1.5V ~ 5.5V and operating temperature -55°C ~ 125°C, offering broader environmental operating conditions and faster propagation delay (3ns).

Group B (Standard Performance): Parts with supply voltage range 2V ~ 6V and operating temperature -40°C ~ 85°C, maintaining electrical specifications aligned with the original 74ACQ373SCX.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation - MC74AC373DWG (onsemi)

MC74AC373DWG is the preferred direct substitute for 74ACQ373SCX. Both parts are manufactured by onsemi, share identical electrical specifications within the 2V ~ 6V supply range and -40°C ~ 85°C operating temperature, and maintain the same 20-SOIC package footprint. MC74AC373DWG holds Active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. The 7.5ns propagation delay represents a minor increase from the original 5.5ns specification but remains within acceptable timing margins for most latch applications.

Secondary Recommendation - SN74AC373DWR (Texas Instruments)

SN74AC373DWR provides an alternative from Texas Instruments with identical electrical parameters to MC74AC373DWG. This part is Active with ROHS3 compliance and is available in Cut Tape and Digi-Reel packaging formats. Selection of SN74AC373DWR is appropriate when Texas Instruments supply chain preference or specific packaging requirements (Cut Tape / Digi-Reel) are factors.

Extended Temperature Option - SN74AC373MDWREP (Texas Instruments)

SN74AC373MDWREP extends the operating temperature range to -55°C ~ 125°C while maintaining 2V ~ 6V supply voltage compatibility. This part is suitable for applications requiring broader environmental operating conditions. Tape & Reel packaging is standard for this variant.

Enhanced Performance Option - CD74AC373M96 (Texas Instruments)

CD74AC373M96 offers superior electrical performance with 3ns propagation delay and extended supply voltage range (1.5V ~ 5.5V) and operating temperature (-55°C ~ 125°C). This part is Active with ROHS3 compliance. Selection is appropriate for designs requiring faster switching characteristics or broader environmental specifications. Note that the 1.5V minimum supply voltage may require circuit design verification if the original application assumes 2V minimum operation.

Package Variant - SN74AC373NSR (Texas Instruments)

SN74AC373NSR maintains electrical compatibility but uses a narrower 20-SO package (5.30mm width) compared to the standard 20-SOIC (7.50mm width). This variant is suitable only if PCB layout accommodates the reduced package width. All other electrical and compliance characteristics align with Group B standard performance specifications.

Frequently Asked Questions (FAQ)

Q: Can I use CD74AC373M96 as a direct replacement for 74ACQ373SCX?

A: CD74AC373M96 is electrically compatible and functionally equivalent. The 1.5V minimum supply voltage is lower than the original 2V specification, which may be advantageous in low-voltage applications. The faster 3ns propagation delay improves timing performance. Verify that your circuit design does not depend on the original 2V minimum threshold. CD74AC373M96 is Active with ROHS3 compliance, ensuring long-term availability.

Q: What is the difference between SN74AC373DWR and SN74AC373MDWREP?

A: Both parts are manufactured by Texas Instruments with identical 2V ~ 6V supply voltage and 7.5ns propagation delay. The primary difference is operating temperature range: SN74AC373DWR operates -40°C ~ 85°C, while SN74AC373MDWREP extends to -55°C ~ 125°C. Select SN74AC373MDWREP if your application requires operation at temperatures below -40°C or above 85°C.

Q: Why is SN74AC373NSR listed as a substitute if the package is different?

A: SN74AC373NSR uses a narrower 20-SO package (5.30mm) versus the standard 20-SOIC (7.50mm). All electrical specifications and tri-state latch functionality remain identical. This variant is a valid substitute only if your PCB layout can accommodate the reduced package width. Verify footprint compatibility before selection.

Q: Is MC74AC373DWG available in different packaging formats?

A: MC74AC373DWG is specified as Tube packaging. If alternative packaging formats (Cut Tape, Tape & Reel) are required, consider SN74AC373DWR (Cut Tape & Digi-Reel) or SN74AC373MDWREP (Tape & Reel) as alternatives with equivalent electrical specifications.

Q: Can I use a substitute part with faster propagation delay (3ns) in place of the original 5.5ns specification?

A: Yes. Faster propagation delay is a performance improvement and does not create compatibility issues. CD74AC373M96 with 3ns delay is a valid substitute. Verify that your circuit design does not depend on the original timing characteristics, though faster switching typically benefits system performance.

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

A: All recommended Active substitute parts (MC74AC373DWG, SN74AC373DWR, CD74AC373M96, SN74AC373MDWREP, SN74AC373NSR) carry ROHS3 compliance and REACH Unaffected status. These certifications ensure regulatory alignment for current manufacturing and distribution requirements.