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74HC166D,653 Equivalent & Substitute Parts
Part Overview
The 74HC166D,653 is an 8-bit parallel-load shift register manufactured by Nexperia USA Inc., designed for serial-to-parallel and parallel-to-serial data conversion in digital logic applications. This component operates across a 2V to 6V supply voltage range with a standard 16-SOIC surface mount package. The part is currently active in production with ROHS3 compliance and unlimited moisture sensitivity rating.
Equivalent and substitute parts are necessary when the primary part number becomes unavailable, when alternative packaging formats are required for specific assembly processes, or when sourcing from multiple manufacturers is needed to ensure supply chain continuity.
Substiute Parts
Key Parameters
| Parameter | Specification |
|---|---|
| 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 Range | -40°C ~ 125°C |
| Package / Case | 16-SOIC (0.154", 3.90mm Width) |
| Mounting Type | Surface Mount |
| RoHS Status | ROHS3 Compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution eligibility for the 74HC166D,653 is determined by the following critical parameters:
Core Functional Parameters: Logic type (Shift Register), number of elements (1), bits per element (8), and function (Parallel or Serial to Serial) must remain identical across all substitutes.
Electrical Parameters: Supply voltage range (2V ~ 6V) and output type (Push-Pull) define electrical compatibility. Parts with identical or extended operating temperature ranges are acceptable substitutes.
Mechanical Parameters: Package type (16-SOIC with 0.154" width, 3.90mm) and mounting type (Surface Mount) must match for direct PCB compatibility.
Compliance Parameters: ROHS3 compliance and MSL rating (1 - Unlimited) are maintained across all listed substitutes.
Parts are grouped into two categories: parametric equivalents (identical specifications from different manufacturers or packaging variants) and similar parts (functionally equivalent with minor specification variations such as extended temperature ranges or automotive qualifications).
Parameter Comparison
| Manufacturer Part Number | Manufacturer | Voltage - Supply | Operating Temperature | Package / Case | Packaging Format | Product Status | Grade / Qualification |
|---|---|---|---|---|---|---|---|
| 74HC166D,653 | Nexperia USA Inc. | 2V ~ 6V | -40°C ~ 125°C | 16-SOIC (0.154", 3.90mm) | Tape & Reel (TR) | Active | Standard |
| 74HC166D-Q100J | Nexperia USA Inc. | 2V ~ 6V | -40°C ~ 125°C | 16-SOIC (0.154", 3.90mm) | Tape & Reel (TR) | Active | Automotive / AEC-Q100 |
| CD74HC166M | Texas Instruments | 2V ~ 6V | -55°C ~ 125°C | 16-SOIC (0.154", 3.90mm) | Tube | Discontinued at DiGi Electronics | Standard |
| CD74HC166M96 | Texas Instruments | 2V ~ 6V | -55°C ~ 125°C | 16-SOIC (0.154", 3.90mm) | Tape & Reel (TR) | Active | Standard |
| SN74HC166AIDRQ1 | Texas Instruments | 2V ~ 6V | -40°C ~ 85°C | 16-SOIC (0.154", 3.90mm) | Tape & Reel (TR) | Active | Automotive / AEC-Q100 |
| SN74HC166D | Texas Instruments | 2V ~ 6V | -40°C ~ 85°C | 16-SOIC (0.154", 3.90mm) | Tube | Discontinued at DiGi Electronics | Standard |
| SN74HC166DR | Texas Instruments | 2V ~ 6V | -40°C ~ 85°C | 16-SOIC (0.154", 3.90mm) | Cut Tape (CT) & Digi-Reel® | Active | Standard |
| SN74HC166DRG4 | Texas Instruments | 2V ~ 6V | -40°C ~ 85°C | 16-SOIC (0.154", 3.90mm) | Cut Tape (CT) & Digi-Reel® | Discontinued at DiGi Electronics | Standard |
| SN74HC166NSR | Texas Instruments | 2V ~ 6V | -40°C ~ 85°C | 16-SOIC (0.209", 5.30mm) | Tape & Reel (TR) | Active | Standard |
| 74HC166D | Toshiba Semiconductor and Storage | 2V ~ 6V | -40°C ~ 125°C | 16-SOIC (0.154", 3.90mm) | Cut Tape (CT) & Digi-Reel® | Active | Standard |
Engineering Selection Recommendations
Primary Substitutes (Parametric Equivalents):
The 74HC166D from Toshiba Semiconductor and Storage and 74HC166D-Q100J from Nexperia USA Inc. are direct parametric equivalents with identical core specifications. The Toshiba variant offers the largest available inventory (63,388 pcs) and maintains the extended operating temperature range (-40°C ~ 125°C). The 74HC166D-Q100J provides automotive-grade qualification (AEC-Q100) for applications requiring automotive compliance.
Active Substitutes with Compatible Specifications:
CD74HC166M96 (Texas Instruments) is actively produced and available in Tape & Reel packaging, with an extended operating temperature range (-55°C ~ 125°C) suitable for industrial applications requiring broader temperature performance.
SN74HC166DR (Texas Instruments) is actively produced in Cut Tape and Digi-Reel formats, with standard operating temperature range (-40°C ~ 85°C), providing alternative packaging flexibility.
SN74HC166AIDRQ1 (Texas Instruments) is actively produced with automotive-grade qualification (AEC-Q100) and restricted operating temperature range (-40°C ~ 85°C), suitable for automotive applications.
Discontinued Parts:
CD74HC166M, SN74HC166D, and SN74HC166DRG4 are discontinued at DiGi Electronics and should not be selected for new designs unless existing inventory is available and supply continuity is confirmed through alternative channels.
Package Consideration:
SN74HC166NSR features a wider 16-SOIC package (0.209", 5.30mm width) compared to the standard 0.154" width. This variant is not recommended as a direct substitute due to PCB layout incompatibility, unless the design specifically accommodates the wider package footprint.
Frequently Asked Questions (FAQ)
Q: Can I substitute the 74HC166D,653 with any of the listed parts without design changes?
A: Yes, all listed parts except SN74HC166NSR are direct pin-compatible substitutes with identical 16-SOIC (0.154", 3.90mm) package dimensions. SN74HC166NSR uses a wider package (0.209", 5.30mm) and requires PCB layout verification before substitution.
Q: What is the difference between parametric equivalents and similar parts?
A: Parametric equivalents maintain identical electrical and thermal specifications across all parameters. Similar parts may have variations in operating temperature range, packaging format, or automotive qualification while maintaining functional compatibility and core electrical characteristics.
Q: Which substitute should I select for a new design?
A: For new designs, select from actively produced parts: 74HC166D (Toshiba), 74HC166D-Q100J (Nexperia, automotive-qualified), CD74HC166M96 (Texas Instruments, extended temperature), or SN74HC166DR (Texas Instruments, alternative packaging). Verify product status and availability with your supplier before finalizing the design.
Q: Are there temperature range limitations I should consider?
A: The main part (74HC166D,653) operates from -40°C to 125°C. Some substitutes (SN74HC166AIDRQ1, SN74HC166D, SN74HC166DR, SN74HC166NSR) have a restricted upper limit of 85°C. Verify your application's temperature requirements before selecting a substitute with a narrower range.
Q: What packaging formats are available?
A: Available formats include Tape & Reel (TR), Tube, Cut Tape (CT) & Digi-Reel®, and Cut Tape (CT) & Digi-Reel® variants. Select based on your assembly process requirements and volume needs.
Q: Are all substitutes ROHS3 compliant?
A: Yes, all listed substitute parts maintain ROHS3 compliance and MSL rating of 1 (Unlimited), matching the original part's environmental and regulatory status.
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