74HCT670N,652 Equivalent & Substitute Parts

Part Overview

The 74HCT670N,652 is a 4x4 Register File logic integrated circuit manufactured by NXP USA Inc., designed for high-speed digital applications requiring parallel data storage and retrieval. This device features three-state outputs and operates from a single 4.5V to 5.5V supply. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for system redesign, legacy product support, and procurement continuity.

Substiute Parts

74HCT670N,652

NXP USA Inc.In Stock: 118474HCT670N,652 Datasheet

Current PartRFQ

CD74HCT670E

Harris CorporationIn Stock: 1832CD74HCT670E Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HCT670N,652 is determined by the following critical parameters:

• Logic Family & Base Product Number: Both the main part and substitute must belong to the 74HCT series and share the base product number 74HCT670 to ensure functional equivalence.
• Register File Architecture: Circuit configuration (1 x 1:1) and independent circuit count (4) must remain identical.
• Electrical Specifications: Supply voltage range (4.5V ~ 5.5V) and output configuration (three-state) must be maintained.
• Package Compatibility: 16-DIP through-hole package with 0.300" (7.62mm) pitch ensures mechanical and electrical interchangeability.
• Operating Temperature: The substitute must support the required temperature range for the application.

The CD74HCT670E qualifies as a direct substitute based on these parameters, despite differences in manufacturer, packaging format, and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The CD74HCT670E manufactured by Harris Corporation is a direct functional equivalent to the 74HCT670N,652. Selection between these parts should be based on the following factors:

RoHS Compliance: The 74HCT670N,652 is ROHS3 compliant, while the CD74HCT670E is RoHS non-compliant. Applications subject to RoHS regulations must use the NXP part or identify alternative modern logic devices.

Operating Temperature Range: The CD74HCT670E supports -55°C to 125°C, providing a wider low-temperature specification than the NXP part (-40°C to 125°C). Selection depends on minimum operating temperature requirements.

Product Status: Both parts are obsolete. For new designs, modern alternatives from current product lines should be evaluated. For legacy system support and repair, either part provides functional equivalence within the specified parameters.

Availability & Packaging: The CD74HCT670E is supplied in tube packaging with 1800 units in stock, while the NXP part is supplied in standard packaging with 1159 units available. Procurement decisions should account for inventory levels and packaging requirements.

Frequently Asked Questions (FAQ)

Q: Can the CD74HCT670E be used as a direct replacement for the 74HCT670N,652 in existing designs?

A: Yes, the CD74HCT670E is functionally equivalent. Both devices share identical logic family (74HCT), base product number (74HCT670), circuit configuration (1 x 1:1 with 4 independent circuits), supply voltage (4.5V ~ 5.5V), and 16-DIP package. Pin-for-pin compatibility is maintained.

Q: What are the key differences between these two parts?

A: The primary differences are manufacturer (NXP vs. Harris), RoHS compliance status (ROHS3 compliant vs. non-compliant), operating temperature range (-40°C to 125°C vs. -55°C to 125°C), and packaging format (standard vs. tube). Electrical and functional specifications are identical.

Q: Are there any temperature-related limitations when substituting?

A: The CD74HCT670E supports a lower minimum temperature (-55°C vs. -40°C). If your application requires operation below -40°C, the CD74HCT670E is suitable. If your application operates only above -40°C, both parts are equivalent.

Q: Does RoHS compliance affect substitution decisions?

A: Yes, if your application or market requires RoHS compliance, the 74HCT670N,652 (ROHS3 compliant) must be used. The CD74HCT670E is RoHS non-compliant and cannot be used in RoHS-regulated applications.

Q: Are both parts still in production?

A: No, both the 74HCT670N,652 and CD74HCT670E are classified as obsolete. For new designs, evaluation of current-generation logic devices is recommended. For legacy system support, both parts remain available through component distributors.

Q: Is the 16-DIP package identical between both parts?

A: Yes, both parts use the 16-DIP (0.300", 7.62mm) through-hole package. Mechanical and electrical pin compatibility is guaranteed, allowing direct socket substitution.