74HC166DB,112 Equivalent & Substitute Parts

Part Overview

The 74HC166DB,112 is an 8-bit parallel-in/serial-out shift register manufactured by Nexperia USA Inc. in a 16-SSOP surface mount package. This logic component operates across a 2V to 6V supply voltage range and supports both parallel and serial data input modes with push-pull output configuration. The part is classified as obsolete, making equivalent substitutes necessary for ongoing design support and procurement continuity.

Substiute Parts

74HC166DB,112

Nexperia USA Inc.In Stock: 79874HC166DB,112 Datasheet

Current PartRFQ

74HC166PW,118

Nexperia USA Inc.In Stock: 256074HC166PW,118 Datasheet

SimilarRFQ

SN74HC166DBR

Texas InstrumentsIn Stock: 3262SN74HC166DBR Datasheet

SimilarRFQ

SN74HC166PWR

Texas InstrumentsIn Stock: 23519SN74HC166PWR Datasheet

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SN74HC166PWT

Texas InstrumentsIn Stock: 3274SN74HC166PWT Datasheet

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74HC166DB,112

NXP SemiconductorsIn Stock: 8134374HC166DB,112 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HC166DB,112 is determined by strict equivalence across the following parameters:

• Base product number (74HC166)
• Logic type (Shift Register)
• Bit configuration (1 element, 8 bits per element)
• Function (Parallel or Serial to Serial)
• Output type (Push-Pull)
• Supply voltage range (2V ~ 6V)
• RoHS3 compliance
• MSL rating (1 - Unlimited)

Substitute parts are grouped into two categories based on package type: 16-SSOP and 16-TSSOP variants. Both package types maintain identical electrical functionality and are mechanically compatible within their respective footprint specifications. Operating temperature ranges may vary between manufacturers, with some substitutes rated to -40°C ~ 85°C versus the original -40°C ~ 125°C specification.

Parameter Comparison

Engineering Selection Recommendations

For direct footprint replacement of the 74HC166DB,112 in 16-SSOP applications, the SN74HC166DBR from Texas Instruments is the primary active substitute. This part maintains identical package geometry and electrical specifications, with the exception of a reduced operating temperature maximum of 85°C versus the original 125°C specification.

For designs utilizing 16-TSSOP packaging, the 74HC166PW,118 from Nexperia USA Inc. is the preferred active substitute, maintaining the full -40°C ~ 125°C operating temperature range. The SN74HC166PWR from Texas Instruments provides an alternative 16-TSSOP option with a -40°C ~ 85°C operating range.

All substitute parts maintain ROHS3 compliance, MSL rating of 1 (Unlimited), and identical electrical functionality. Selection between substitutes should be based on package footprint requirements and operating temperature specifications of the target application.

Frequently Asked Questions (FAQ)

Q: Can the 74HC166PW,118 (16-TSSOP) be used as a direct replacement for the 74HC166DB,112 (16-SSOP)?

A: No. While both parts are electrically equivalent 74HC166 shift registers, they use different surface mount packages. The 16-TSSOP package (0.173" width) has a smaller footprint than the 16-SSOP package (0.209" width). PCB layout and footprint modifications are required for substitution between these package types.

Q: What is the significance of the operating temperature difference between the original part (-40°C ~ 125°C) and Texas Instruments substitutes (-40°C ~ 85°C)?

A: The operating temperature range defines the maximum ambient temperature at which the component maintains specified electrical performance. Applications requiring operation above 85°C must use the Nexperia 74HC166PW,118 or verify that the Texas Instruments variants meet the specific thermal requirements of the design.

Q: Are all listed substitutes RoHS3 compliant?

A: Yes. All substitute parts listed maintain ROHS3 compliance and MSL rating of 1 (Unlimited), meeting current environmental and reliability standards.

Q: What packaging options are available for 74HC166 shift registers?

A: The 74HC166 base product is available in two surface mount packages: 16-SSOP (0.209" width) and 16-TSSOP (0.173" width). Selection depends on PCB layout constraints and available footprint space.

Q: Is the SN74HC166PWT suitable for new designs?

A: The SN74HC166PWT is discontinued at DiGi Electronics. For new designs, use the active alternatives: SN74HC166PWR (Texas Instruments, 16-TSSOP) or 74HC166PW,118 (Nexperia, 16-TSSOP).