74HCT166DB,118 Equivalent & Substitute Parts

Part Overview

The 74HCT166DB,118 is an 8-bit parallel-in/serial-out shift register manufactured by Nexperia USA Inc., housed in a 16-SSOP surface mount package. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. The shift register performs parallel or serial to serial conversion with push-pull output configuration, operating across a 4.5V to 5.5V supply voltage range and -40°C to 125°C temperature range.

Substiute Parts

74HCT166DB,118

Nexperia USA Inc.In Stock: 92074HCT166DB,118 Datasheet

Current PartRFQ

74HCT166D,653

Nexperia USA Inc.In Stock: 321274HCT166D,653 Datasheet

SimilarRFQ

SN74HC166DBR

Texas InstrumentsIn Stock: 3262SN74HC166DBR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74HCT166DB,118 is determined by the following critical parameters:

• Logic Type: Shift Register (8-bit configuration)
• Function: Parallel or Serial to Serial conversion capability
• Output Type: Push-Pull
• Number of Elements and Bits: 1 element, 8 bits per element
• Voltage Supply Range: Must support 4.5V ~ 5.5V minimum
• Operating Temperature Range: Must support -40°C ~ 125°C minimum
• RoHS3 Compliance: Required for regulatory alignment
• Moisture Sensitivity Level: MSL 1 classification

Substitute parts are grouped based on matching these core electrical and functional parameters. Package variations (16-SSOP versus 16-SOIC) are permitted substitutions when PCB layout accommodates the alternative form factor, as the electrical performance remains equivalent.

Parameter Comparison

Engineering Selection Recommendations

74HCT166D,653 (Nexperia USA Inc.): This substitute maintains identical electrical specifications and temperature range as the main part while offering active product status. The package differs (16-SOIC versus 16-SSOP), requiring PCB layout verification. This option provides direct functional equivalence with improved supply availability.

SN74HC166DBR (Texas Instruments): This substitute maintains the same 16-SSOP package footprint as the main part, eliminating layout redesign requirements. However, the operating temperature range is limited to -40°C to 85°C, which does not fully cover the original specification of -40°C to 125°C. The supply voltage range is broader (2V ~ 6V), providing additional operational flexibility. This option is suitable for applications not requiring the full 125°C upper temperature limit. Active product status ensures long-term availability.

Both substitutes carry ROHS3 compliance and MSL 1 classification, maintaining regulatory and handling requirements consistent with the original part.

Frequently Asked Questions (FAQ)

Q: Can 74HCT166D,653 directly replace 74HCT166DB,118 on the existing PCB?

A: Electrical substitution is direct. However, 74HCT166D,653 uses a 16-SOIC package (0.154" width) versus the original 16-SSOP package (0.209" width). PCB footprint modification is required. Verify pad spacing and layout compatibility before implementation.

Q: What is the key difference between 74HCT166D,653 and SN74HC166DBR?

A: Both are functionally equivalent 8-bit shift registers. 74HCT166D,653 maintains the full -40°C to 125°C temperature range of the original part. SN74HC166DBR operates to 85°C maximum, limiting its use in high-temperature applications. SN74HC166DBR retains the original 16-SSOP package, eliminating layout changes.

Q: Is the SN74HC166DBR suitable for applications requiring 125°C operation?

A: No. SN74HC166DBR is rated to 85°C maximum. For applications requiring -40°C to 125°C operation, use 74HCT166D,653 with appropriate PCB layout modifications for the 16-SOIC package.

Q: Are all three parts RoHS3 compliant?

A: Yes. 74HCT166DB,118, 74HCT166D,653, and SN74HC166DBR are all ROHS3 compliant with MSL 1 classification.

Q: Which substitute offers the best supply availability?

A: Both 74HCT166D,653 and SN74HC166DBR carry active product status with documented inventory levels exceeding 3000 units, providing superior availability compared to the obsolete main part.