74HCT166N,652 Equivalent & Substitute Parts

Part Overview

The 74HCT166N,652 is an 8-bit parallel-in serial-out shift register manufactured by NXP USA Inc. in a 16-DIP through-hole package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The shift register performs parallel or serial to serial conversion functions with push-pull output configuration, operating across a 4.5V to 5.5V supply voltage range and -40°C to 125°C temperature range.

Substiute Parts

74HCT166N,652

NXP USA Inc.In Stock: 98974HCT166N,652 Datasheet

Current PartRFQ

CD74HCT166E

Harris CorporationIn Stock: 2151CD74HCT166E Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74HCT166N,652 are identified based on strict electrical and mechanical compatibility criteria. The following parameters must match or be compatible for substitution:

• Logic Type: Shift Register (1 Element, 8 Bit)
• Function: Parallel or Serial to Serial conversion
• Output Type: Push-Pull
• Supply Voltage Range: 4.5V ~ 5.5V (compatible range)
• Package / Case: 16-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole
• Series: 74HCT

The CD74HCT166E qualifies as a direct substitute based on these core parameters. Both parts share identical logic configuration, pin count, package dimensions, and electrical operating specifications within the 74HCT logic family.

Parameter Comparison

Engineering Selection Recommendations

The CD74HCT166E serves as a functional equivalent to the 74HCT166N,652 for applications requiring 8-bit parallel-in serial-out shift register functionality within the 74HCT logic family. Both parts are classified as obsolete products.

When selecting between these parts, consider the following compliance factors:

• The 74HCT166N,652 maintains ROHS3 compliance, suitable for applications with RoHS requirements.
• The CD74HCT166E is RoHS non-compliant and should be selected only for applications without RoHS mandates.
• The CD74HCT166E offers an extended lower operating temperature range (-55°C vs. -40°C), providing broader thermal coverage for low-temperature environments.
• Both parts share identical electrical specifications, pin configurations, and package dimensions, ensuring direct functional interchangeability in circuit designs.

Frequently Asked Questions (FAQ)

Q: Can the CD74HCT166E replace the 74HCT166N,652 in existing designs?

A: Yes. Both parts are 8-bit shift registers in the 74HCT series with identical pin configurations, package dimensions (16-DIP), and electrical operating specifications (4.5V ~ 5.5V supply, push-pull output). Direct substitution is electrically compatible. Compliance requirements must be evaluated separately.

Q: What is the difference in operating temperature range?

A: The 74HCT166N,652 operates from -40°C to 125°C. The CD74HCT166E extends the lower temperature limit to -55°C, providing operation in colder environments. Both share the same upper temperature limit of 125°C.

Q: Are there RoHS compliance differences?

A: Yes. The 74HCT166N,652 is ROHS3 compliant. The CD74HCT166E is RoHS non-compliant. Select based on your application's regulatory requirements.

Q: Do both parts use the same package?

A: Yes. Both use 16-DIP (0.300", 7.62mm) through-hole packages with identical pin spacing and dimensions, enabling direct board-level substitution.

Q: Why are both parts classified as obsolete?

A: Both the 74HCT166N,652 and CD74HCT166E are obsolete products. Inventory availability may be limited. Verify supplier stock before design commitment.