74HCT20N,652 Equivalent & Substitute Parts

Part Overview

The 74HCT20N,652 is a NAND Gate IC featuring 2 channels with 4 inputs per channel in a 14-DIP package, manufactured by NXP USA Inc. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The 74HCT series logic gate remains functionally relevant despite its obsolete status, with direct equivalents available from alternative manufacturers maintaining identical electrical and mechanical specifications.

Substiute Parts

74HCT20N,652

NXP USA Inc.In Stock: 261174HCT20N,652 Datasheet

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CD74HCT20E

Harris CorporationIn Stock: 6422CD74HCT20E Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HCT20N,652 is determined by strict equivalence across the following critical parameters:

• Logic function: NAND Gate with identical 2-channel, 4-input configuration
• Electrical specifications: Supply voltage range (4.5V ~ 5.5V), quiescent current (2 µA max), output current (4mA), input logic levels, and propagation delay (28ns @ 4.5V, 50pF)
• Package format: 14-DIP through-hole mounting with 0.300" (7.62mm) pitch
• Base product series: 74HCT20

The CD74HCT20E from Harris Corporation meets all functional and electrical requirements for direct substitution, with the exception of RoHS compliance status and operating temperature range extension.

Parameter Comparison

Engineering Selection Recommendations

The CD74HCT20E provides functional equivalence to the 74HCT20N,652 with identical electrical performance and package compatibility. Selection between these parts depends on specific design requirements:

RoHS Compliance Requirement: If ROHS3 compliance is mandatory, the 74HCT20N,652 remains the required choice. The CD74HCT20E does not meet RoHS standards and is unsuitable for applications with regulatory compliance obligations.

Operating Temperature Range: The CD74HCT20E extends the lower operating temperature limit to -55°C, compared to -40°C for the 74HCT20N,652. Applications requiring operation below -40°C benefit from the Harris alternative.

Availability and Procurement: Both parts carry obsolete status. Inventory availability should be verified with component distributors, as stock levels determine practical substitution feasibility.

Frequently Asked Questions (FAQ)

Q: Can the CD74HCT20E directly replace the 74HCT20N,652 in all applications?

A: Direct replacement is possible for applications without RoHS compliance requirements. Electrical specifications, logic function, and package format are identical. RoHS compliance status differs and must be evaluated against design specifications.

Q: What is the significance of the operating temperature range difference?

A: The CD74HCT20E operates from -55°C to 125°C, while the 74HCT20N,652 operates from -40°C to 125°C. This difference is relevant only for applications requiring operation below -40°C. Standard commercial and industrial applications typically operate within the -40°C to 125°C range.

Q: Are there any package or pinout differences between these parts?

A: No. Both parts use identical 14-DIP packaging with 0.300" (7.62mm) pitch. Pinout and mechanical dimensions are equivalent, enabling direct socket substitution.

Q: Why is RoHS compliance status different if the parts are functionally equivalent?

A: RoHS compliance reflects manufacturing process and material composition standards at the time of production. The 74HCT20N,652 was manufactured to ROHS3 standards, while the CD74HCT20E predates or does not conform to these requirements. Compliance status is independent of electrical function.

Q: What should be verified before implementing a substitution?

A: Confirm that RoHS compliance requirements align with the selected part. Verify operating temperature range adequacy for the application. Confirm package compatibility with existing PCB designs. Validate component availability through authorized distributors.