SN74HC166AIDREP Equivalent & Substitute Parts

Part Overview

The SN74HC166AIDREP is an 8-bit parallel-load shift register manufactured by Texas Instruments, housed in a 16-SOIC surface mount package. This logic IC functions as a parallel or serial to serial converter, operating across a 2V to 6V supply voltage range with an operating temperature span of -40°C to 85°C. The device is RoHS3 compliant and carries an MSL rating of 1 (Unlimited), indicating no moisture sensitivity constraints. The part is currently active in production with 930 units in stock. Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required, or when upgraded temperature specifications are needed for specific applications.

Substiute Parts

SN74HC166AIDREP

Texas InstrumentsIn Stock: 1032SN74HC166AIDREP Datasheet

Current PartRFQ

SN74HC166AIDRQ1

Texas InstrumentsIn Stock: 806SN74HC166AIDRQ1 Datasheet

Parametric EquivalentRFQ

SN74HC166DR

Texas InstrumentsIn Stock: 2575SN74HC166DR Datasheet

Parametric EquivalentRFQ

SN74HC166DRG4

Texas InstrumentsIn Stock: 2894SN74HC166DRG4 Datasheet

Parametric EquivalentRFQ

74HC166D,653

Nexperia USA Inc.In Stock: 328474HC166D,653 Datasheet

UpgradeRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74HC166AIDREP is determined by strict adherence to 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), Voltage Supply Range (2V ~ 6V), Package Type (16-SOIC), and Mounting Type (Surface Mount). All substitute parts listed maintain these core electrical and mechanical specifications. Variations in operating temperature range, manufacturer, packaging format (Tape & Reel versus Cut Tape), product status, and automotive qualification do not disqualify a part from substitution provided the primary parameters remain unchanged. The substitute parts are categorized as parametric equivalents (identical specifications with possible packaging or qualification differences) or upgrades (enhanced temperature range or alternative manufacturer).

Parameter Comparison

Engineering Selection Recommendations

SN74HC166AIDRQ1 is a direct parametric equivalent with identical electrical specifications and packaging format. This part carries AEC-Q100 automotive qualification, making it suitable for applications requiring automotive-grade components while maintaining full compatibility with the original design.

SN74HC166DR and SN74HC166DRG4 are parametric equivalents available in Cut Tape and Digi-Reel® packaging formats. These parts are suitable for applications where alternative packaging is acceptable. SN74HC166DRG4 is discontinued at DiGi Electronics and should be avoided for new procurement unless existing inventory is available.

74HC166D,653 manufactured by Nexperia USA Inc. is an upgrade option offering an extended operating temperature range of -40°C to 125°C compared to the original -40°C to 85°C specification. This part is suitable for applications requiring enhanced thermal performance and is currently active in production with 3183 units in stock.

For new designs, prioritize parts with Active product status. For automotive applications, SN74HC166AIDRQ1 is the recommended choice. For applications requiring extended temperature operation, 74HC166D,653 provides the necessary thermal margin.

Frequently Asked Questions (FAQ)

Q: Can SN74HC166AIDRQ1 be used as a direct replacement for SN74HC166AIDREP?

A: Yes. Both parts share identical electrical specifications, package type (16-SOIC), and operating parameters (2V ~ 6V supply, -40°C ~ 85°C operating temperature). The primary difference is AEC-Q100 automotive qualification on the AIDRQ1 variant, which does not affect general-purpose applications.

Q: What is the difference between Tape & Reel and Cut Tape packaging?

A: Tape & Reel (TR) packaging supplies components on continuous tape suitable for high-volume automated assembly. Cut Tape (CT) and Digi-Reel® packaging provide smaller quantities on cut tape segments, typically for lower-volume or prototype applications. Both formats contain identical components; the difference is in supply format and quantity per reel.

Q: Is 74HC166D,653 from Nexperia a suitable replacement?

A: Yes, for applications within the original -40°C to 85°C temperature range. The Nexperia part offers an extended temperature specification to 125°C, making it suitable for higher-temperature environments. All core electrical and mechanical parameters remain compatible.

Q: Why is SN74HC166DRG4 listed as discontinued?

A: SN74HC166DRG4 is discontinued at DiGi Electronics but may remain available through other distributors. For new designs, select from parts with Active product status: SN74HC166AIDREP, SN74HC166AIDRQ1, SN74HC166DR, or 74HC166D,653.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All listed substitute parts maintain RoHS3 compliance and MSL rating of 1 (Unlimited), ensuring compatibility with modern manufacturing and environmental standards.