SN74HC166NS Equivalent & Substitute Parts

Part Overview

The SN74HC166NS is a parallel load shift register manufactured by Texas Instruments, designed for applications requiring conversion between parallel and serial data formats. This 8-bit shift register operates across a wide supply voltage range of 2V to 6V and is housed in a 16-SOIC surface mount package.

The SN74HC166NS is currently discontinued at DiGi Electronics. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production requirements. Substitute parts must maintain identical electrical characteristics, functional specifications, and mechanical compatibility to ensure seamless integration into existing designs.

Substiute Parts

SN74HC166NS

Texas InstrumentsIn Stock: 889SN74HC166NS Datasheet

Current PartRFQ

SN74HC166NSR

Texas InstrumentsIn Stock: 2138SN74HC166NSR Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the SN74HC166NS is determined by strict equivalence across the following critical parameters:

• Logic Type: Shift Register (1 element, 8-bit configuration)
• Function: Parallel or Serial to Serial conversion capability
• Output Type: Push-Pull output stage
• Voltage Supply Range: 2V ~ 6V
• Operating Temperature Range: -40°C ~ 85°C
• Package / Case: 16-SOIC (0.209", 5.30mm Width)
• Mounting Type: Surface Mount
• Base Product Number: 74HC166

The SN74HC166NSR qualifies as a direct substitute because it maintains identical electrical specifications, functional performance, and mechanical compatibility. The primary distinction is packaging format: the SN74HC166NSR is supplied in Tape & Reel (TR) format with active product status, whereas the SN74HC166NS is supplied in standard packaging and is discontinued.

Parameter Comparison

Engineering Selection Recommendations

The SN74HC166NSR is the direct substitute for the SN74HC166NS. Both parts are manufactured by Texas Instruments, share identical electrical and mechanical specifications, and maintain full compliance with ROHS3 and REACH requirements.

The SN74HC166NSR is currently in active production status with confirmed inventory availability, whereas the SN74HC166NS is discontinued. For new designs and ongoing production requirements, the SN74HC166NSR is the appropriate selection. The Tape & Reel packaging format of the SN74HC166NSR is standard for high-volume manufacturing and automated assembly processes.

Both parts carry MSL Level 1 (Unlimited) moisture sensitivity classification, indicating no special moisture control requirements during storage or handling.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC166NSR be used as a direct replacement for the SN74HC166NS?

A: Yes. The SN74HC166NSR is electrically and mechanically identical to the SN74HC166NS. Both parts feature the same 8-bit shift register configuration, push-pull output stage, 2V to 6V supply voltage range, and 16-SOIC package. The primary difference is packaging format and product status.

Q: What is the difference between standard packaging and Tape & Reel (TR) format?

A: Standard packaging typically refers to individual component packaging or small quantity trays. Tape & Reel (TR) format is a continuous carrier tape wound on a reel, designed for automated pick-and-place assembly equipment. Both formats contain identical components; the difference is in presentation and handling method.

Q: Are there any compliance or certification differences between these parts?

A: No. Both the SN74HC166NS and SN74HC166NSR maintain identical ROHS3 compliance, REACH unaffected status, and MSL Level 1 classification. Compliance certifications are equivalent.

Q: What is the operating temperature range for these shift registers?

A: Both parts operate across -40°C to 85°C, suitable for industrial and commercial temperature environments.

Q: Can these parts be used interchangeably in PCB designs?

A: Yes. The SN74HC166NS and SN74HC166NSR share identical pinouts, electrical characteristics, and mechanical dimensions. No design modifications are required for substitution.