74HC166PW,112 Equivalent & Substitute Parts

Part Overview

The 74HC166PW,112 is an 8-bit parallel-in/serial-out shift register manufactured by Nexperia USA Inc. in a 16-TSSOP surface mount package. This logic component operates across a 2V to 6V supply range and supports both parallel and serial data input modes with push-pull output configuration. The part is currently listed as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement.

Substiute Parts

74HC166PW,112

Nexperia USA Inc.In Stock: 108374HC166PW,112 Datasheet

Current PartRFQ

SN74HC166AIPWRG4Q1

Texas InstrumentsIn Stock: 24678SN74HC166AIPWRG4Q1 Datasheet

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SN74HC166DBR

Texas InstrumentsIn Stock: 3262SN74HC166DBR Datasheet

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SN74HC166PWR

Texas InstrumentsIn Stock: 23519SN74HC166PWR Datasheet

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SN74HC166PWT

Texas InstrumentsIn Stock: 3274SN74HC166PWT Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HC166PW,112 is determined by the following critical parameters:

Core Functional Parameters:

• Logic type: Shift Register
• Configuration: 1 element, 8 bits per element
• Function: Parallel or Serial to Serial
• Output type: Push-Pull
• Supply voltage range: 2V ~ 6V
• Package type: 16-TSSOP or compatible footprint

Compliance Parameters:

• RoHS3 compliance
• MSL rating: 1 (Unlimited)
• REACH unaffected status

Substitute parts must maintain identical functional specifications and electrical characteristics. Package compatibility is determined by pin count and footprint dimensions. Operating temperature range variations are acceptable when the substitute meets or exceeds the minimum requirements of the application.

Parameter Comparison

Engineering Selection Recommendations

Direct Substitutes (16-TSSOP Package):

SN74HC166PWR and SN74HC166AIPWRG4Q1 are functionally equivalent to the 74HC166PW,112 with identical package footprints (16-TSSOP, 0.173" width). Both are manufactured by Texas Instruments and maintain ROHS3 compliance. SN74HC166PWR is currently active in production with high inventory availability. SN74HC166AIPWRG4Q1 includes automotive-grade qualification (AEC-Q100) and is suitable for applications requiring automotive-level reliability.

Alternative Package Option:

SN74HC166DBR provides functional equivalence in a 16-SSOP package (0.209" width). This substitute requires PCB layout modification due to different package dimensions but maintains all electrical and functional specifications.

Limited Availability:

SN74HC166PWT is discontinued at DiGi Electronics and should not be selected for new designs requiring long-term supply assurance.

Frequently Asked Questions (FAQ)

Q: Can SN74HC166DBR replace 74HC166PW,112 directly on the PCB?

A: No. SN74HC166DBR uses a 16-SSOP package (0.209" width) versus the original 16-TSSOP package (0.173" width). PCB footprint modification is required. Pin count and function remain identical.

Q: What is the difference between SN74HC166PWR and SN74HC166AIPWRG4Q1?

A: Both are functionally equivalent with identical 16-TSSOP footprints and electrical specifications. SN74HC166AIPWRG4Q1 includes automotive-grade qualification (AEC-Q100) and is specified for automotive applications. SN74HC166PWR is the standard industrial-grade version.

Q: Does the operating temperature difference affect substitution?

A: The original 74HC166PW,112 operates to 125°C, while Texas Instruments substitutes operate to 85°C. Substitutes are acceptable for applications with maximum operating temperatures at or below 85°C. Applications requiring operation above 85°C require design review.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and REACH unaffected status, matching the original part's environmental certifications.

Q: Which substitute has the best availability?

A: SN74HC166PWR has the highest inventory (23,500 pcs) and active product status, making it the preferred choice for new designs and ongoing procurement.