SN74HC166PW Equivalent & Substitute Parts

Part Overview

The SN74HC166PW is an 8-bit parallel-in/serial-out shift register manufactured by Texas Instruments in a 16-TSSOP surface mount package. This component is classified as discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and production requirements. The part operates across a 2V to 6V supply voltage range with push-pull output configuration, suitable for digital logic applications requiring serial data conversion.

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-TSSOP (0.173", 4.40mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SN74HC166PW 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 minimum), package type (16-TSSOP), and compliance certifications (ROHS3, REACH Unaffected). Parts meeting these criteria are classified into three categories based on product status and availability: direct manufacturer equivalents, upgrade alternatives with extended temperature ratings, and manufacturer-recommended automotive-grade options.

Parameter Comparison

Parameter	SN74HC166PW	SN74HC166PWR	74HC166PW,118	74HC166PW-Q100J
Manufacturer	Texas Instruments	Texas Instruments	Nexperia USA Inc.	Nexperia USA Inc.
Logic Type	Shift Register	Shift Register	Shift Register	Shift Register
Number of Bits per Element	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
Output Type	Push-Pull	Push-Pull	Push-Pull	Push-Pull
Voltage - Supply	2V ~ 6V	2V ~ 6V	2V ~ 6V	2V ~ 6V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	16-TSSOP	16-TSSOP	16-TSSOP	16-TSSOP
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Product Status	Discontinued at DiGi Electronics	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Grade	Standard	Standard	Standard	Automotive
Qualification	None	None	None	AEC-Q100

Engineering Selection Recommendations

For direct replacement with identical specifications, SN74HC166PWR (Texas Instruments) maintains the original operating temperature range of -40°C to 85°C and is currently in active production status with high inventory availability.

For applications requiring extended temperature performance, 74HC166PW,118 (Nexperia USA Inc.) provides an operating range of -40°C to 125°C while maintaining all other electrical and mechanical parameters. This part is suitable for industrial and wide-temperature applications.

For automotive applications or systems requiring AEC-Q100 qualification, 74HC166PW-Q100J (Nexperia USA Inc.) is the manufacturer-recommended option. This part meets automotive-grade standards with extended temperature range (-40°C to 125°C) and is actively produced.

All substitute parts maintain ROHS3 compliance and identical 16-TSSOP packaging, ensuring PCB layout compatibility without redesign.

Frequently Asked Questions (FAQ)

Q: Can SN74HC166PWR be used as a direct replacement for SN74HC166PW? A: Yes. SN74HC166PWR is a direct equivalent manufactured by Texas Instruments with identical electrical specifications, operating temperature range (-40°C to 85°C), supply voltage (2V ~ 6V), and 16-TSSOP package. The primary difference is packaging format (Cut Tape & Digi-Reel versus standard packaging) and active product status.

Q: What is the difference between the Nexperia and Texas Instruments versions? A: Both manufacturers produce functionally equivalent 8-bit shift registers in 16-TSSOP packages with identical logic specifications. Nexperia versions (74HC166PW,118 and 74HC166PW-Q100J) offer extended operating temperature to 125°C compared to the Texas Instruments 85°C maximum. The 74HC166PW-Q100J includes AEC-Q100 automotive qualification.

Q: Is the 74HC166PW-Q100J suitable for non-automotive applications? A: Yes. The 74HC166PW-Q100J meets all standard logic specifications and can be used in any application requiring the 74HC166 shift register function. The automotive qualification and extended temperature range represent additional capabilities that do not restrict use in general industrial or consumer applications.

Q: Will changing from SN74HC166PW to a substitute part require PCB modifications? A: No. All substitute parts use the identical 16-TSSOP package with the same pinout and mechanical dimensions (0.173" width, 4.40mm). No PCB layout changes are required.

Q: Are all substitute parts RoHS compliant? A: Yes. SN74HC166PWR, 74HC166PW,118, and 74HC166PW-Q100J are all ROHS3 compliant and REACH unaffected, meeting environmental regulatory requirements.

Q: Which substitute part should be selected for new designs? A: For standard applications, SN74HC166PWR provides active production status and direct equivalence. For designs requiring extended temperature performance, 74HC166PW,118 is recommended. For automotive applications, 74HC166PW-Q100J with AEC-Q100 qualification is the appropriate selection.

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