SN74HC166DRG4 Equivalent & Substitute Parts

Part Overview

The SN74HC166DRG4 is an 8-bit parallel-in/serial-out shift register manufactured by Texas Instruments in a 16-SOIC surface mount package. This component is classified as discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement. The shift register performs parallel or serial to serial conversion functions across a supply voltage range of 2V to 6V with push-pull output configuration.

Key Parameters

Parameter	Value
Manufacturer Part Number	SN74HC166DRG4
Manufacturer	Texas Instruments
Logic Type	Shift Register
Number of Elements	1
Number of Bits per Element	8
Function	Parallel or Serial to Serial
Output Type	Push-Pull
Voltage - Supply	2V ~ 6V
Operating Temperature	-40°C ~ 85°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SN74HC166DRG4 is determined by strict equivalence across the following parameters: logic type (shift register), number of elements (1), number of bits per element (8), function (parallel or serial to serial), output type (push-pull), supply voltage range (2V ~ 6V), package type (16-SOIC), and mounting type (surface mount). All substitute parts listed maintain these core electrical and mechanical specifications. Substitutes are grouped by manufacturer recommendation status and product availability, with consideration for operating temperature range and automotive qualification where applicable.

Parameter Comparison

Parameter	SN74HC166DRG4	SN74HC166DR	SN74HC166AIDRQ1	74HC166D,653	74HC166D-Q100J
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Nexperia USA Inc.	Nexperia USA Inc.
Logic Type	Shift Register	Shift Register	Shift Register	Shift Register	Shift Register
Number of Bits per Element	8	8	8	8	8
Function	Parallel or Serial to Serial	Parallel or Serial to Serial	Parallel or Serial to Serial	Parallel or Serial to Serial	Parallel or Serial to Serial
Output Type	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Discontinued	Active	Active	Active	Active
Grade	Standard	Standard	Automotive	Standard	Automotive
Qualification	None	None	AEC-Q100	None	AEC-Q100
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

For direct replacement of the discontinued SN74HC166DRG4, the SN74HC166DR from Texas Instruments is the primary equivalent, maintaining identical electrical specifications and operating temperature range while offering active product status and continued availability.

The SN74HC166AIDRQ1 provides an automotive-grade alternative with AEC-Q100 qualification, suitable for applications requiring automotive compliance. This part maintains all core electrical parameters and operates within the same temperature range as the original.

The Nexperia USA Inc. alternatives, 74HC166D,653 and 74HC166D-Q100J, extend the operating temperature range to -40°C ~ 125°C, providing enhanced thermal performance. The 74HC166D-Q100J includes automotive qualification (AEC-Q100), making it appropriate for automotive applications requiring extended temperature operation.

Selection between these substitutes depends on application requirements: standard industrial applications use SN74HC166DR; automotive applications without extended temperature requirements use SN74HC166AIDRQ1; automotive applications with extended temperature operation use 74HC166D-Q100J; and non-automotive applications with extended temperature requirements use 74HC166D,653.

Frequently Asked Questions (FAQ)

Q: Can SN74HC166DR be used as a direct replacement for SN74HC166DRG4?

A: Yes. Both parts share identical electrical specifications, including 8-bit shift register function, 2V ~ 6V supply voltage, -40°C ~ 85°C operating temperature, push-pull output, and 16-SOIC package. The primary difference is product status: SN74HC166DRG4 is discontinued while SN74HC166DR is active.

Q: What is the difference between Texas Instruments and Nexperia substitutes?

A: Texas Instruments substitutes (SN74HC166DR and SN74HC166AIDRQ1) maintain the -40°C ~ 85°C operating temperature range. Nexperia substitutes (74HC166D,653 and 74HC166D-Q100J) extend this to -40°C ~ 125°C. Automotive-qualified versions include AEC-Q100 certification.

Q: Are all substitutes compatible with the original 16-SOIC package footprint?

A: Yes. All substitute parts use the 16-SOIC (0.154", 3.90mm Width) package, ensuring PCB footprint compatibility and direct board-level substitution.

Q: Which substitute should be selected for automotive applications?

A: For automotive applications, use SN74HC166AIDRQ1 (standard temperature range) or 74HC166D-Q100J (extended temperature range). Both carry AEC-Q100 qualification.

Q: Do all substitutes maintain ROHS3 compliance?

A: Yes. All listed substitutes are ROHS3 compliant with MSL rating of 1 (Unlimited), matching the original part's environmental compliance profile.

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