SN74HC166DRE4 Equivalent & Substitute Parts

Part Overview

The SN74HC166DRE4 is an 8-bit parallel or serial-to-serial shift register manufactured by Texas Instruments in a 16-SOIC surface mount package. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement. The device operates across a 2V to 6V supply voltage range with a standard operating temperature of -40°C to 85°C, serving applications requiring data shifting and serial-to-parallel conversion in logic circuits.

Key Parameters

Parameter	Value
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 SN74HC166DRE4 is determined by strict equivalence across the following parameters: logic type (shift register), bit configuration (8-bit single element), function (parallel or serial to serial), output type (push-pull), supply voltage range (2V ~ 6V), package type (16-SOIC), and mounting method (surface mount). All substitute parts maintain these core electrical and mechanical specifications. Differences in product status, manufacturer, operating temperature range, and automotive qualification do not affect functional interchangeability within the specified electrical parameters.

Parameter Comparison

Parameter	SN74HC166DRE4	SN74HC166DR	SN74HC166AIDRQ1	SN74HC166DRG4	74HC166D,653	74HC166D-Q100J
Manufacturer	Texas Instruments	Texas Instruments	Texas Instruments	Texas Instruments	Nexperia USA Inc.	Nexperia USA Inc.
Logic Type	Shift Register	Shift Register	Shift Register	Shift Register	Shift Register	Shift Register
Number of Bits per Element	8	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	Parallel or Serial to Serial
Output Type	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull	Push-Pull
Voltage - Supply	2V ~ 6V	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 ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC	16-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Product Status	Discontinued at DiGi Electronics	Active	Active	Discontinued at DiGi Electronics	Active	Active
Grade	Standard	Standard	Automotive	Standard	Standard	Automotive

Engineering Selection Recommendations

For direct replacement of the SN74HC166DRE4, the SN74HC166DR is the primary choice, offering identical electrical specifications and active product status from Texas Instruments. The SN74HC166AIDRQ1 provides an automotive-grade alternative with AEC-Q100 qualification, suitable for applications requiring automotive compliance. The Nexperia parts 74HC166D,653 and 74HC166D-Q100J extend the operating temperature range to -40°C to 125°C, providing enhanced thermal performance for high-temperature environments. The 74HC166D-Q100J includes automotive qualification for temperature-extended automotive applications. All substitute parts maintain full functional compatibility within the specified 2V to 6V supply voltage range and 16-SOIC package footprint.

Frequently Asked Questions (FAQ)

Q: Can SN74HC166DR be used as a direct replacement for SN74HC166DRE4?

A: Yes. Both parts share identical electrical specifications: 8-bit shift register function, 2V to 6V supply voltage, -40°C to 85°C operating temperature, push-pull output, and 16-SOIC package. The SN74HC166DR is active and available, making it the recommended substitute.

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

A: Both manufacturers produce functionally equivalent 74HC166 shift registers meeting the same electrical parameters. Nexperia parts (74HC166D,653 and 74HC166D-Q100J) offer extended operating temperature to 125°C. Selection depends on manufacturer preference, availability, and thermal requirements.

Q: Are automotive-grade versions compatible with standard applications?

A: Yes. The SN74HC166AIDRQ1 and 74HC166D-Q100J are automotive-qualified versions that meet all standard electrical specifications. They can be used in non-automotive applications without functional impact, though they may carry higher cost.

Q: Does operating temperature range affect substitution compatibility?

A: Operating temperature range does not affect functional substitution within the specified electrical parameters. Parts rated to -40°C to 125°C (Nexperia versions) are compatible with applications requiring -40°C to 85°C operation. However, applications requiring temperatures above 85°C must use the extended-range versions.

Q: Are all substitute parts in the same package?

A: Yes. All substitute parts use the 16-SOIC (0.154", 3.90mm Width) surface mount package, ensuring identical PCB footprint and mounting compatibility.

Q: What does MSL 1 (Unlimited) mean for moisture sensitivity?

A: MSL 1 indicates the lowest moisture sensitivity level, meaning the component has unlimited shelf life under standard storage conditions without requiring special moisture control or baking procedures prior to soldering.

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