74HC640N,652 Equivalent & Substitute Parts

Part Overview

The 74HC640N,652 is a logic transceiver IC with inverting functionality, manufactured by NXP USA Inc. in a 20-DIP through-hole package. This component features 1 element with 8 bits per element and 3-state output capability, operating across a 2V to 6V supply voltage range. The part is classified as obsolete, necessitating identification of equivalent alternatives for ongoing system maintenance and new designs requiring this functional specification.

Substiute Parts

74HC640N,652

NXP USA Inc.In Stock: 115674HC640N,652 Datasheet

Current PartRFQ

CD74HC640E

Harris CorporationIn Stock: 2310CD74HC640E Datasheet

DirectRFQ

CD74HC640M

Harris CorporationIn Stock: 1976CD74HC640M Datasheet

DirectRFQ

SN74HC640N

Texas InstrumentsIn Stock: 1519SN74HC640N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74HC640N,652 is determined by the following critical parameters:

• Logic Type: Transceiver, Inverting
• Number of Elements: 1
• Number of Bits per Element: 8
• Output Type: 3-State
• Current - Output High, Low: 7.8mA, 7.8mA
• Voltage - Supply: 2V ~ 6V
• Mounting Type: Through Hole
• Package / Case: 20-DIP (0.300", 7.62mm)

Substitute parts must maintain identical electrical specifications and compatible package configurations. The 74HC640 base product number identifies the functional family across manufacturers. Substitutes are categorized by package type (DIP vs. SOIC) and manufacturer compliance status.

Parameter Comparison

Engineering Selection Recommendations

For through-hole DIP package applications, SN74HC640N (Texas Instruments) is the primary substitute. This part maintains identical electrical specifications, operates within the required temperature range, and holds active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment.

CD74HC640E (Harris Corporation) provides an alternative through-hole DIP substitute with extended lower operating temperature range (-55°C vs. -40°C). However, this part carries obsolete status and RoHS non-compliance, limiting suitability for new designs or applications with environmental compliance requirements.

CD74HC640M (Harris Corporation) is functionally equivalent but employs surface-mount 20-SOIC packaging. This substitute is applicable only to designs utilizing surface-mount assembly processes and is not interchangeable with through-hole DIP layouts. This part is also obsolete and RoHS non-compliant.

Frequently Asked Questions (FAQ)

Q: Can CD74HC640E replace 74HC640N,652 in existing through-hole designs?

A: Yes, electrically. Both parts use 20-DIP through-hole packaging with identical pin configurations and electrical specifications. However, CD74HC640E is obsolete and RoHS non-compliant, whereas 74HC640N,652 is ROHS3 compliant. For new designs or systems with environmental compliance mandates, SN74HC640N is preferred.

Q: Is CD74HC640M compatible with 74HC640N,652?

A: No, not for direct substitution. CD74HC640M uses 20-SOIC surface-mount packaging, while 74HC640N,652 uses 20-DIP through-hole packaging. These require different PCB layouts and assembly processes. CD74HC640M is suitable only for surface-mount applications.

Q: What is the temperature range difference between SN74HC640N and 74HC640N,652?

A: SN74HC640N operates from -40°C to 85°C, while 74HC640N,652 operates from -40°C to 125°C. The original part supports higher maximum operating temperature. For applications requiring operation above 85°C, SN74HC640N is not suitable.

Q: Are all substitutes electrically identical?

A: Yes, all listed substitutes maintain identical output current (7.8mA), supply voltage range (2V ~ 6V), and functional specifications (1 element, 8 bits per element, 3-state output, inverting transceiver logic). Differences exist only in temperature range, product status, RoHS compliance, and package type.

Q: Which substitute is recommended for new designs?

A: SN74HC640N (Texas Instruments) is the manufacturer-recommended substitute. It maintains active product status, ROHS3 compliance, and identical electrical specifications with through-hole DIP packaging compatible with the original design.