SN74HC166D 8-Bit Shift Register Equivalent & Substitute Parts

Part Overview

The SN74HC166D is an 8-bit parallel-in/serial-out shift register manufactured by Texas Instruments in a 16-SOIC surface mount package. This component is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement. The part functions as a parallel or serial to serial converter, suitable for applications requiring data serialization in logic circuits operating at 2V to 6V supply voltages.

Substiute Parts

SN74HC166D

Texas InstrumentsIn Stock: 2809SN74HC166D Datasheet

Current PartRFQ

SN74HC166DR

Texas InstrumentsIn Stock: 2575SN74HC166DR Datasheet

DirectRFQ

74HC166D,653

Nexperia USA Inc.In Stock: 328474HC166D,653 Datasheet

UpgradeRFQ

74HC166D-Q100J

Nexperia USA Inc.In Stock: 291674HC166D-Q100J Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the SN74HC166D is determined by strict equivalence in the following parameters:

• Logic Type: Shift Register (8-bit, single element)
• Function: Parallel or Serial to Serial conversion
• Output Type: Push-Pull
• Supply Voltage Range: 2V ~ 6V minimum compatibility
• Package: 16-SOIC form factor
• Mounting: Surface Mount
• Base Product Number: 74HC166 series

Substitute parts maintain identical electrical functionality and pinout compatibility. Variations in operating temperature range and packaging format (Tube vs. Tape & Reel) do not affect functional substitution. Extended temperature range variants (-40°C ~ 125°C) provide enhanced thermal performance for demanding applications.

Parameter Comparison

Engineering Selection Recommendations

SN74HC166DR (Texas Instruments, Active Status): Direct functional equivalent with identical electrical specifications and operating temperature range. Recommended for standard industrial applications requiring continuity with the original SN74HC166D design. Active product status ensures long-term availability.

74HC166D,653 (Nexperia USA Inc., Active Status): Functionally equivalent with extended operating temperature range (-40°C ~ 125°C), providing thermal margin for high-temperature environments. Suitable for applications where enhanced temperature performance is beneficial without requiring automotive qualification.

74HC166D-Q100J (Nexperia USA Inc., Automotive Grade, AEC-Q100 Qualified): Functionally equivalent with extended operating temperature range and automotive-grade qualification. Required for automotive applications, safety-critical systems, or designs subject to AEC-Q100 compliance requirements. Active product status with established supply chain for automotive markets.

All substitute parts maintain ROHS3 compliance and MSL Level 1 rating, ensuring compatibility with standard manufacturing and storage protocols.

Frequently Asked Questions (FAQ)

Q: Can SN74HC166DR be used as a direct replacement for SN74HC166D?

A: Yes. SN74HC166DR is a direct functional equivalent manufactured by Texas Instruments with identical electrical specifications, pinout, and operating temperature range (-40°C ~ 85°C). The primary difference is packaging format (Tape & Reel vs. Tube).

Q: What is the difference between the standard and extended temperature variants?

A: The 74HC166D,653 and 74HC166D-Q100J variants operate across -40°C ~ 125°C, compared to -40°C ~ 85°C for the standard SN74HC166D and SN74HC166DR. Extended temperature range provides thermal margin for high-temperature applications but does not alter electrical functionality or pinout.

Q: Is the 74HC166D-Q100J suitable for non-automotive applications?

A: Yes. The 74HC166D-Q100J is functionally equivalent and can be used in any application compatible with the SN74HC166D. AEC-Q100 qualification is an additional certification that does not restrict use in standard industrial or consumer applications.

Q: Are all substitute parts available in the same package?

A: Yes. All substitute parts use the 16-SOIC (0.154", 3.90mm Width) surface mount package, ensuring mechanical and electrical compatibility with existing PCB designs.

Q: What is the significance of ROHS3 compliance?

A: ROHS3 compliance indicates the part meets Restriction of Hazardous Substances Directive requirements, restricting lead, cadmium, mercury, and other hazardous materials. All listed parts maintain ROHS3 compliance for regulatory and environmental standards.

Q: Can these parts be used interchangeably in production?

A: Yes, provided the application requirements are met. Standard variants (SN74HC166D, SN74HC166DR) are interchangeable for applications operating within -40°C ~ 85°C. Extended temperature variants (74HC166D,653, 74HC166D-Q100J) are suitable for all applications within their specified range and are backward compatible with standard temperature designs.