CD74AC74E-NG Equivalent & Substitute Parts

Part Overview

The CD74AC74E-NG is a dual D-type flip-flop logic integrated circuit manufactured by Texas Instruments in a 14-DIP through-hole package. This device functions as a 2-element, 1-bit positive edge-triggered flip-flop with complementary outputs and integrated set/preset and reset functionality. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support, maintenance, and production continuity. Substitute parts maintain functional equivalence while offering improved availability, updated product status, or alternative packaging options suitable for modern manufacturing processes.

Substiute Parts

CD74AC74E-NG

Texas InstrumentsIn Stock: 899CD74AC74E-NG Datasheet

Current PartRFQ

CD74AC74M96

Texas InstrumentsIn Stock: 6333CD74AC74M96 Datasheet

MFR RecommendedRFQ

CD74AC74E

Harris CorporationIn Stock: 1507CD74AC74E Datasheet

Parametric EquivalentRFQ

CD74AC74EX

Harris CorporationIn Stock: 1617CD74AC74EX Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD74AC74E-NG is determined by strict equivalence across the following parameters: logic function (dual D-type flip-flop), trigger type (positive edge), output type (complementary), control functions (set/preset and reset), number of elements (2) and bits per element (1), clock frequency capability, propagation delay, supply voltage range, output current ratings, quiescent current, input capacitance, and operating temperature range. All substitute parts listed maintain identical or superior electrical performance within these specifications. Packaging and mounting type may differ, and product status or compliance certifications may vary. Substitutes are grouped by their relationship to the main part: manufacturer-recommended substitutes offer active product status with alternative packaging; parametric equivalents maintain identical electrical characteristics with the same or compatible packaging.

Parameter Comparison

Engineering Selection Recommendations

CD74AC74M96 (Manufacturer-Recommended Substitute): This part is the primary substitute for new designs and production transitions. It is manufactured by Texas Instruments with active product status, ensuring long-term availability and supply chain stability. The CD74AC74M96 maintains all electrical parameters identical to the main part and carries ROHS3 compliance certification. The primary difference is packaging: it uses a 14-SOIC surface-mount package instead of the through-hole 14-DIP format. Selection of this part requires PCB redesign to accommodate surface-mount assembly. Tape & Reel packaging supports automated manufacturing processes. Clock frequency is rated at 100 MHz, which is within the operational range of the main part's 110 MHz specification.

CD74AC74EX (Active Parametric Equivalent): This Harris Corporation part maintains identical electrical specifications and through-hole 14-DIP packaging, eliminating the need for PCB redesign. Product status is active, supporting ongoing availability. Clock frequency matches the main part at 110 MHz. RoHS compliance status is non-compliant. Bulk packaging format is suitable for manual assembly or small-volume production. Moisture sensitivity level is rated at 3 (168 hours), requiring controlled storage conditions.

CD74AC74E (Parametric Equivalent): This Harris Corporation part provides identical electrical performance and through-hole 14-DIP packaging. Product status is obsolete, similar to the main part, limiting its suitability for new long-term designs. Clock frequency matches at 110 MHz. RoHS compliance status is non-compliant. Tube packaging supports manual assembly processes.

For new designs requiring long-term supply assurance, CD74AC74M96 is the recommended choice despite packaging differences. For legacy system maintenance or designs constrained to through-hole assembly, CD74AC74EX provides active product status with compatible packaging.

Frequently Asked Questions (FAQ)

Q: Can CD74AC74M96 be used as a direct replacement for CD74AC74E-NG without circuit modification?

A: CD74AC74M96 is electrically equivalent but uses a different package type (14-SOIC surface-mount versus 14-DIP through-hole). Direct PCB substitution is not possible without redesign. However, the electrical function, timing characteristics, and pin configuration (in terms of signal function) are identical, allowing use in redesigned circuits.

Q: What is the primary advantage of CD74AC74M96 over the main part?

A: CD74AC74M96 has active product status from Texas Instruments, ensuring continued availability and manufacturing support. It also carries ROHS3 compliance certification. The surface-mount package supports modern automated assembly processes.

Q: Are all substitute parts pin-compatible with the CD74AC74E-NG?

A: CD74AC74E and CD74AC74EX are pin-compatible with the main part, both using 14-DIP through-hole packages. CD74AC74M96 uses a 14-SOIC surface-mount package with different physical pin layout, requiring PCB redesign.

Q: What is the difference between the parametric equivalents CD74AC74E and CD74AC74EX?

A: Both are Harris Corporation parts with identical electrical specifications and 14-DIP packaging. CD74AC74E is supplied in tube packaging and has obsolete product status. CD74AC74EX is supplied in bulk packaging and has active product status, making it preferable for ongoing production.

Q: Does the 100 MHz clock frequency rating of CD74AC74M96 affect compatibility with designs using the 110 MHz main part?

A: No. The 100 MHz specification represents the maximum guaranteed clock frequency for CD74AC74M96. Designs operating at or below 100 MHz are fully compatible. Designs requiring operation above 100 MHz but below 110 MHz should use CD74AC74EX or CD74AC74E instead.

Q: What are the RoHS compliance implications when selecting a substitute?

A: CD74AC74M96 is ROHS3 compliant, meeting current environmental regulations. CD74AC74E and CD74AC74EX are RoHS non-compliant. Selection depends on end-product regulatory requirements and customer specifications.

Q: How does moisture sensitivity affect part handling for CD74AC74EX?

A: CD74AC74EX has a moisture sensitivity level of 3 (168 hours), meaning the part can be exposed to ambient conditions for up to 168 hours before soldering. Extended storage requires dry-pack conditions with desiccant. CD74AC74M96 has MSL 1 (unlimited), requiring no special moisture control.

Q: Can CD74AC74M96 be used in legacy through-hole PCB designs?

A: No. CD74AC74M96 requires surface-mount assembly. For through-hole designs, use CD74AC74EX or CD74AC74E.