74AC374SC Equivalent & Substitute Parts

Part Overview

The 74AC374SC 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 logic latch with positive edge triggering and is housed in a 20-SOIC package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing system support and new designs requiring this functional specification.

Substiute Parts

74AC374SC

onsemiIn Stock: 192074AC374SC Datasheet

Current PartRFQ

MC74AC374DWR2G

onsemiIn Stock: 3778MC74AC374DWR2G Datasheet

SimilarRFQ

MC74AC374DWG

onsemiIn Stock: 984MC74AC374DWG Datasheet

DirectRFQ

SN74AC374DW

Texas InstrumentsIn Stock: 1972SN74AC374DW Datasheet

DirectRFQ

SN74AC374DWR

Texas InstrumentsIn Stock: 2160SN74AC374DWR Datasheet

DirectRFQ

CD74AC374M

Harris CorporationIn Stock: 2098CD74AC374M Datasheet

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CD74AC374M96

Texas InstrumentsIn Stock: 1428CD74AC374M96 Datasheet

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SN74AC374NSR

Texas InstrumentsIn Stock: 4151SN74AC374NSR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74AC374SC is determined by the following critical parameters that must remain consistent across equivalent parts:

• Base product number (74AC374 series)
• Functional type (D-Type flip-flop, 1 element, 8-bit)
• Output configuration (Tri-State, Non-Inverted)
• Trigger mechanism (Positive Edge)
• Package type (20-SOIC)
• Electrical specifications (Clock frequency, propagation delay, voltage supply range, output current)

Substitute parts are grouped into two categories: direct equivalents with identical electrical performance and similar parts with acceptable parameter variations within the 74AC374 series specification.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring direct replacement of the 74AC374SC, the following parts are recommended based on product status and compliance certifications:

Primary Substitutes (Active Status, ROHS3 Compliant):

• SN74AC374DWR (Texas Instruments): Active product with ROHS3 compliance. Electrical performance matches the original specification with 8ns propagation delay and 4 µA quiescent current. Available in Cut Tape and Digi-Reel packaging.

• MC74AC374DWR2G (onsemi): Active product with ROHS3 compliance. Maintains 9.5ns propagation delay specification with reduced 8 µA quiescent current. Available in Tape & Reel packaging.

• SN74AC374NSR (Texas Instruments): Active product with ROHS3 compliance. Identical electrical performance to the original with 9.5ns propagation delay. Package variant features 20-SOIC (0.209", 5.30mm Width) for space-constrained applications.

Secondary Substitutes (Active Status, Extended Temperature Range):

• CD74AC374M96 (Texas Instruments): Active product with ROHS3 compliance and extended operating temperature range (-55°C to 125°C). Clock frequency reduced to 110 MHz with 15.1ns propagation delay. Suitable for applications requiring wider temperature operation.

Not Recommended:

• CD74AC374M (Harris Corporation): Obsolete status and RoHS non-compliant. Extended temperature range (-55°C to 125°C) available but reduced clock frequency (125 MHz) and increased propagation delay (10.8ns).

• MC74AC374DWG (onsemi): While active and ROHS3 compliant, this part is available only in Tube packaging, limiting procurement flexibility compared to standard tape and reel options.

Frequently Asked Questions (FAQ)

Q: Can SN74AC374DWR directly replace 74AC374SC in existing designs?

A: Yes. SN74AC374DWR maintains identical functional specifications (D-Type, 8-bit, tri-state output, positive edge trigger) and operates within the same voltage supply range (2V ~ 6V) and temperature range (-40°C ~ 85°C). Propagation delay is 8ns versus the original 9.5ns, representing improved performance. Pin configuration and package dimensions (20-SOIC, 0.295" width) are identical.

Q: What is the difference between MC74AC374DWR2G and MC74AC374DWG?

A: Both parts are manufactured by onsemi with identical electrical specifications. The primary difference is packaging: MC74AC374DWR2G is supplied in Tape & Reel format, while MC74AC374DWG is supplied in Tube format. Tape & Reel packaging is standard for automated assembly processes.

Q: Why does SN74AC374NSR have a different package width (0.209" vs 0.295")?

A: SN74AC374NSR uses a narrower 20-SOIC package (0.209", 5.30mm Width) compared to the standard 20-SOIC (0.295", 7.50mm Width). Both are 20-pin SOIC packages with identical pin counts and electrical specifications. The narrower package reduces PCB footprint. Verify PCB layout compatibility before substitution.

Q: Is CD74AC374M96 suitable for high-temperature applications?

A: CD74AC374M96 operates across -55°C to 125°C, extending the temperature range beyond the original 74AC374SC (-40°C to 85°C). However, clock frequency is reduced to 110 MHz and propagation delay increases to 15.1ns. Use this part only when extended temperature operation is required and reduced speed is acceptable.

Q: What does ROHS3 compliance mean for component selection?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead and other hazardous materials. For new designs and systems subject to environmental regulations, ROHS3 compliant parts are required. The 74AC374SC does not specify RoHS status, making ROHS3 compliant substitutes necessary for regulated applications.

Q: Can I use CD74AC374M as a substitute?

A: CD74AC374M is obsolete and RoHS non-compliant. While functionally equivalent, its obsolete status limits long-term availability and support. Active, ROHS3 compliant alternatives are available and recommended for all new designs and ongoing production.