74HC174N,652 Equivalent & Substitute Parts

Part Overview

The 74HC174N,652 is a D-type flip-flop logic integrated circuit manufactured by NXP USA Inc., designed for digital signal processing and sequential logic applications. This component features 6-bit positive edge-triggered flip-flops in a 16-DIP package configuration. The part is currently classified as obsolete, making equivalent substitute parts necessary for ongoing design support, maintenance, and production continuity.

Substiute Parts

74HC174N,652

NXP USA Inc.In Stock: 112774HC174N,652 Datasheet

Current PartRFQ

CD74HC174E

Harris CorporationIn Stock: 1744CD74HC174E Datasheet

MFR RecommendedRFQ

SN74HC174AN

Texas InstrumentsIn Stock: 884SN74HC174AN Datasheet

MFR RecommendedRFQ

SN74HC174N

Texas InstrumentsIn Stock: 2756SN74HC174N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74HC174N,652 are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Core Compatibility Criteria:

• Base product number: 74HC174 (ensures identical logic function and pinout)
• Package type: 16-DIP (0.300", 7.62mm) (ensures mechanical fit and pin compatibility)
• Type: D-Type flip-flop with 6-bit configuration (ensures functional equivalence)
• Trigger type: Positive edge (ensures timing behavior compatibility)
• Output type: Non-Inverted (ensures signal polarity compatibility)
• Voltage supply range: 2V ~ 6V (ensures operational voltage compatibility)
• Mounting type: Through Hole (ensures assembly compatibility)

All qualified substitutes maintain these core parameters. Variations in clock frequency, propagation delay, input capacitance, and operating temperature ranges are acceptable within the scope of substitute qualification, as these represent performance characteristics rather than functional incompatibilities.

Parameter Comparison

Engineering Selection Recommendations

SN74HC174N (Texas Instruments) - Primary Substitute

The SN74HC174N is the recommended primary substitute for the 74HC174N,652. This part maintains full functional and mechanical compatibility while offering the advantage of active product status. The SN74HC174N is ROHS3 compliant and REACH unaffected, meeting modern regulatory requirements. The operating temperature range of -40°C to 85°C covers standard industrial applications, and the propagation delay of 27ns at 6V with 50pF load is within acceptable performance parameters. This part is currently in active production with substantial inventory availability.

CD74HC174E (Harris Corporation) - Secondary Substitute

The CD74HC174E provides functional equivalence with identical electrical characteristics and package configuration. However, this part carries obsolete product status and RoHS non-compliance, limiting its suitability for new designs or applications requiring regulatory compliance. The extended operating temperature range of -55°C to 125°C may be beneficial for extreme temperature environments. This option is suitable only when specific temperature performance requirements or legacy system compatibility necessitate its use.

SN74HC174AN (Texas Instruments) - Limited Applicability

The SN74HC174AN is listed as active with ROHS3 compliance and REACH unaffected status. However, insufficient technical specification data is provided for this variant. This part should be evaluated only when complete specification documentation confirms full compatibility with the 74HC174N,652 requirements.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC174N directly replace the 74HC174N,652 without circuit modifications?

A: Yes. The SN74HC174N maintains identical pinout, package configuration, and core electrical characteristics. Direct substitution is possible without circuit board modifications or design changes.

Q: What is the significance of the different clock frequency ratings (107 MHz vs. 50 MHz vs. 35 MHz)?

A: Clock frequency represents the maximum operating speed specification. All three parts exceed typical application requirements for 74HC174 logic circuits. The lower clock frequency ratings of substitute parts do not prevent substitution in standard applications operating below these maximum ratings.

Q: Does the CD74HC174E's RoHS non-compliance disqualify it as a substitute?

A: RoHS compliance is a regulatory and procurement requirement rather than a functional compatibility criterion. The CD74HC174E remains functionally equivalent but may not be acceptable for applications or markets requiring RoHS compliance. For new designs and regulated industries, the ROHS3-compliant SN74HC174N is the appropriate choice.

Q: Are there differences in propagation delay that affect circuit timing?

A: Propagation delays are 28ns (74HC174N,652 and CD74HC174E) and 27ns (SN74HC174N) at 6V with 50pF load. These differences are negligible for standard logic applications and do not require timing circuit adjustments.

Q: What is the impact of different input capacitance values?

A: Input capacitance values (3.5 pF, 10 pF, and 3 pF) represent minor variations in device loading characteristics. These differences do not affect functional compatibility in typical applications and do not require circuit redesign.

Q: Can the CD74HC174E be used in new production designs?

A: The CD74HC174E's obsolete status and RoHS non-compliance make it unsuitable for new production designs. The SN74HC174N, with active status and full regulatory compliance, is the appropriate choice for new designs.

Q: What is the difference between the 16-DIP and 16-PDIP package designations?

A: Both designations refer to the same 16-pin dual in-line package with 0.300" (7.62mm) spacing. The terminology variation reflects different manufacturer documentation standards. Physical compatibility is identical.

Q: Is the extended operating temperature range of the CD74HC174E (-55°C to 125°C) an advantage over the SN74HC174N (-40°C to 85°C)?

A: The extended range is beneficial only for applications requiring operation below -40°C or above 85°C. For standard industrial and commercial applications operating within -40°C to 85°C, both parts are equivalent. Application requirements determine whether the extended range justifies the regulatory compliance trade-offs of the CD74HC174E.