74HCT174D,652 Equivalent & Substitute Parts

Part Overview

The 74HCT174D,652 is a D-Type flip-flop logic integrated circuit manufactured by Nexperia USA Inc., designed for digital signal processing and sequential logic applications. This device features 6-bit positive edge-triggered flip-flop functionality with master reset capability in a 16-SOIC surface mount package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance, legacy design support, and component procurement.

Substiute Parts

74HCT174D,652

Nexperia USA Inc.In Stock: 104274HCT174D,652 Datasheet

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CD74HCT174M

Harris CorporationIn Stock: 5858CD74HCT174M Datasheet

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CD74HCT174M96

Texas InstrumentsIn Stock: 2711CD74HCT174M96 Datasheet

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CD74HCT174MT

Texas InstrumentsIn Stock: 1234CD74HCT174MT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HCT174D,652 is determined by strict equivalence in the following parameters:

• Functional equivalence: D-Type flip-flop with 6-bit configuration and master reset function
• Package compatibility: 16-SOIC (0.154", 3.90mm Width) surface mount package
• Electrical specifications: Supply voltage range 4.5V ~ 5.5V, positive edge trigger
• Series compatibility: 74HCT logic family
• Pin configuration: Identical pinout and signal definitions

The substitute parts listed below maintain these core parameters while differing in manufacturing source, product status, and certain performance characteristics such as clock frequency and propagation delay specifications.

Parameter Comparison

Engineering Selection Recommendations

CD74HCT174M96 (Texas Instruments) is the primary recommended substitute. This part maintains full functional and electrical equivalence with the 74HCT174D,652 while offering active product status, ensuring long-term availability and supply chain stability. It carries ROHS3 compliance certification, meeting modern environmental and regulatory requirements. The part is available in Cut Tape and Digi-Reel packaging formats.

CD74HCT174MT (Texas Instruments) serves as a secondary option with identical electrical specifications and ROHS3 compliance. This part carries Last Time Buy status, indicating limited future availability. It is supplied in Tape & Reel packaging format.

CD74HCT174M (Harris Corporation) is functionally equivalent but carries RoHS non-compliance status and obsolete product classification. This part should be selected only when legacy system requirements or specific procurement constraints mandate Harris Corporation sourcing.

All three substitute parts operate within the same supply voltage range and temperature specifications as the original part. The primary performance difference is clock frequency and propagation delay; substitute parts operate at 25 MHz versus the original 69 MHz specification. This difference is acceptable for applications where the original 69 MHz specification was not a critical design requirement.

Frequently Asked Questions (FAQ)

Q: Can CD74HCT174M96 directly replace 74HCT174D,652 in existing designs?

A: Yes. Both parts are 16-SOIC surface mount packages with identical pinouts, supply voltage requirements (4.5V ~ 5.5V), and D-Type flip-flop functionality with 6-bit configuration. Direct PCB-level substitution is possible without design modification.

Q: What is the significance of the clock frequency difference (69 MHz vs. 25 MHz)?

A: The original 74HCT174D,652 specifies 69 MHz maximum clock frequency, while substitute parts specify 25 MHz. This difference reflects manufacturing process variations between Nexperia and Texas Instruments. For applications operating below 25 MHz, this difference is not functionally significant. Applications requiring operation above 25 MHz must retain the original Nexperia part or conduct timing analysis to confirm substitute part compatibility.

Q: Why is CD74HCT174M96 preferred over CD74HCT174MT?

A: CD74HCT174M96 carries Active product status, ensuring continued manufacturing and availability. CD74HCT174MT is Last Time Buy status, indicating limited production windows and eventual discontinuation. For new designs or long-term system support, CD74HCT174M96 provides superior supply chain assurance.

Q: Are there packaging format differences between substitute parts?

A: Yes. CD74HCT174M is supplied in Tube packaging. CD74HCT174M96 is supplied in Cut Tape and Digi-Reel formats. CD74HCT174MT is supplied in Tape & Reel format. All three maintain the same 16-SOIC physical package. Packaging format selection depends on assembly process requirements and order quantity.

Q: Does RoHS compliance status affect electrical performance?

A: No. RoHS compliance is a regulatory and environmental classification that does not alter electrical performance or functional characteristics. ROHS3 compliance indicates the part meets current environmental standards. RoHS non-compliance in CD74HCT174M may restrict use in applications subject to environmental regulations or customer requirements mandating RoHS compliance.

Q: What is the operating temperature range difference?

A: The original 74HCT174D,652 operates from -40°C to 125°C. All substitute parts operate from -55°C to 125°C. The substitute parts provide extended low-temperature operation capability, which is beneficial for applications in extreme environments but not required for standard industrial temperature ranges.