74AC374SJX Equivalent & Substitute Parts

Part Overview

The 74AC374SJX is a D-type flip-flop logic integrated circuit manufactured by onsemi, featuring 1 element with 8-bit positive edge triggering capability. This component is classified as obsolete, which necessitates identification of equivalent and substitute parts for ongoing design requirements and production continuity. The 74AC374 series provides standard D-type flip-flop functionality with tri-state, non-inverted outputs suitable for digital logic applications requiring edge-triggered data capture and storage.

Substiute Parts

74AC374SJX

onsemiIn Stock: 204074AC374SJX Datasheet

Current PartRFQ

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

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74AC374SJX is determined by the following critical parameters: base product number (74AC374), D-type flip-flop function with 8-bit configuration, positive edge triggering, tri-state non-inverted output, and surface mount packaging in 20-SOIC form factor. Substitute parts are grouped into two categories based on electrical and mechanical compatibility:

Category 1: Direct Parametric Equivalents — Parts maintaining identical or superior electrical specifications within the same package footprint (0.209" width, 20-SOIC). These parts preserve the original performance envelope including clock frequency, propagation delay, voltage supply range, and operating temperature range.

Category 2: Functional Equivalents with Package Variation — Parts maintaining core D-type flip-flop functionality and electrical specifications but with different 20-SOIC package width (0.295", 7.50mm). These parts are electrically compatible but require PCB layout verification due to package dimensional differences.

Substitution eligibility is based on: matching base product number (74AC374), identical logic function and bit configuration, compatible output type and trigger mechanism, and surface mount technology. All substitute parts listed maintain the 20-SOIC package family, ensuring mechanical compatibility with standard surface mount assembly processes.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: SN74AC374NSR (Texas Instruments)

The SN74AC374NSR is the optimal substitute for the 74AC374SJX. This part maintains identical package dimensions (20-SOIC, 0.209" width), matching the original PCB footprint without layout modifications. Electrical specifications are equivalent, including 155 MHz clock frequency, 9.5 ns propagation delay at 5V/50pF, 2V–6V supply voltage range, and -40°C to 85°C operating temperature. The part holds Active product status with ROHS3 compliance and REACH Unaffected certification, ensuring long-term availability and regulatory alignment. Quiescent current is reduced to 4 µA compared to the original 40 µA, providing improved power efficiency.

Secondary Recommendation: SN74AC374DWR (Texas Instruments)

The SN74AC374DWR provides superior electrical performance with 8 ns propagation delay (versus 9.5 ns original) and reduced quiescent current of 4 µA. This part is Active status with ROHS3 compliance. The package footprint differs (0.295" width versus 0.209" original), requiring PCB layout verification. Clock frequency and supply voltage specifications match the original. This option is suitable when performance improvement is prioritized and PCB redesign is feasible.

Tertiary Recommendation: CD74AC374M96 (Texas Instruments)

The CD74AC374M96 is an Active, ROHS3-compliant alternative with extended operating temperature range (-55°C to 125°C). Clock frequency is reduced to 110 MHz with 15.1 ns propagation delay, making this part suitable for applications not requiring maximum speed. The 0.295" package width requires PCB layout verification. Quiescent current is 8 µA. This option is appropriate for temperature-critical or extended-range applications.

Not Recommended: CD74AC374M (Harris Corporation)

The CD74AC374M is obsolete with RoHS non-compliance status, presenting regulatory and availability risks. While electrically functional, this part does not address the obsolescence issue of the original component and introduces compliance concerns for new designs.

Frequently Asked Questions (FAQ)

Q: Can SN74AC374NSR be used as a direct drop-in replacement for 74AC374SJX?

A: Yes. The SN74AC374NSR maintains identical package dimensions (20-SOIC, 0.209" width), electrical specifications, and pin configuration. No PCB layout modifications are required. This part is the direct equivalent substitute.

Q: What is the difference between the 0.209" and 0.295" package widths?

A: Both are 20-SOIC packages but with different body widths. The 0.209" width (narrow body) matches the original 74AC374SJX footprint. The 0.295" width (wide body) requires PCB layout verification to confirm pad spacing compatibility. Consult PCB design files and assembly documentation before selecting wide-body alternatives.

Q: Why does the 74AC374SJX show 40 µA quiescent current while substitutes show 4–8 µA?

A: The original specification reflects onsemi's manufacturing process. Texas Instruments and Harris Corporation parts demonstrate lower quiescent current through improved process technology. This difference does not affect functional compatibility and represents an improvement in power efficiency.

Q: Are all substitute parts RoHS compliant?

A: No. SN74AC374NSR, SN74AC374DWR, SN74AC374DW, and CD74AC374M96 are ROHS3 compliant. CD74AC374M is RoHS non-compliant. For new designs subject to RoHS regulations, select only ROHS3-compliant alternatives.

Q: What is the significance of Active versus Obsolete product status?

A: Active status indicates ongoing manufacturing and long-term availability. Obsolete status indicates discontinued production with limited remaining inventory. For production continuity, prioritize Active-status parts such as SN74AC374NSR, SN74AC374DWR, and CD74AC374M96.

Q: Can I use CD74AC374M96 in applications requiring the full -40°C to 85°C temperature range?

A: Yes. CD74AC374M96 supports -55°C to 125°C, which encompasses the original -40°C to 85°C range. This part is suitable for all temperature profiles within the original specification and for extended-range applications.

Q: How do I verify PCB compatibility with wide-body 20-SOIC packages?

A: Consult your PCB design files and assembly documentation for pad spacing and clearance specifications. Measure the distance between pad centers on your existing layout. Compare against the 0.295" body width specification. If pad spacing accommodates the wider body without trace interference or clearance violations, the part is mechanically compatible.