SN74HCS166DR Equivalent & Substitute Parts

Part Overview

The SN74HCS166DR is an 8-bit parallel-load shift register manufactured by Texas Instruments, classified as a logic integrated circuit in the 74HCS series. This component functions as a parallel or serial to serial converter, featuring push-pull output configuration and surface mount packaging in a 16-SOIC form factor. The device is currently in active production status with RoHS3 compliance and unlimited moisture sensitivity rating (MSL 1).

Substitute parts are identified when equivalent electrical performance and mechanical compatibility are maintained across critical parameters including logic type, bit configuration, voltage supply range, operating temperature, package form factor, and compliance certifications.

Substiute Parts

SN74HCS166DR

Texas InstrumentsIn Stock: 3128SN74HCS166DR Datasheet

Current PartRFQ

SN74HCS165DR

Texas InstrumentsIn Stock: 12503SN74HCS165DR Datasheet

Parametric EquivalentRFQ

SN74HCS165QDRQ1

Texas InstrumentsIn Stock: 6036SN74HCS165QDRQ1 Datasheet

Parametric EquivalentRFQ

SN74HCS166QDRQ1

Texas InstrumentsIn Stock: 3040SN74HCS166QDRQ1 Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74HCS166DR is determined by strict equivalence across the following parameters:

Critical Substitution Parameters:

• Logic Type: Shift Register
• Number of Bits per Element: 8
• Number of Elements: 1
• Function: Parallel or Serial to Serial
• Output Type: Push-Pull
• Voltage - Supply: 2V ~ 6V
• Operating Temperature: -40°C ~ 125°C (TA)
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount
• RoHS Status: ROHS3 Compliant
• Moisture Sensitivity Level (MSL): 1 (Unlimited)

All identified substitute parts maintain identical values across these parameters. Variations in base product number (74HCS165 versus 74HCS166) and automotive qualification (AEC-Q100) represent functional or application-specific distinctions that do not preclude substitution when electrical and mechanical specifications align.

Parameter Comparison

Engineering Selection Recommendations

SN74HCS165DR is a direct parametric equivalent to the SN74HCS166DR. Both parts share identical electrical specifications, package configuration, and compliance certifications. Selection between these two standard-grade devices depends on application-specific functional requirements related to the base product number designation.

SN74HCS165QDRQ1 and SN74HCS166QDRQ1 are automotive-qualified variants carrying AEC-Q100 certification. These parts maintain all electrical and mechanical equivalence to the standard-grade SN74HCS166DR while meeting automotive industry qualification standards. Selection of automotive-qualified variants is appropriate for applications requiring AEC-Q100 compliance or automotive-grade reliability assurance.

All four parts are active products with current manufacturing status and RoHS3 compliance. Inventory availability varies across part numbers, with SN74HCS165DR showing the highest stock level at 12,491 pieces.

Frequently Asked Questions (FAQ)

Q: Can SN74HCS165DR be used as a direct replacement for SN74HCS166DR?

A: Yes. Both parts maintain identical electrical specifications including 8-bit shift register configuration, 2V to 6V supply voltage range, -40°C to 125°C operating temperature, and 16-SOIC surface mount packaging. Functional differences between 74HCS165 and 74HCS166 base product numbers do not affect parametric substitution eligibility.

Q: What is the difference between standard-grade and automotive-qualified versions?

A: Standard-grade parts (SN74HCS166DR, SN74HCS165DR) are suitable for general industrial and commercial applications. Automotive-qualified versions (SN74HCS165QDRQ1, SN74HCS166QDRQ1) carry AEC-Q100 certification and are specified for automotive applications requiring enhanced reliability qualification. All versions maintain identical electrical and mechanical parameters.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All four parts use the 16-SOIC (0.154", 3.90mm Width) package form factor and surface mount mounting type. PCB footprints and land patterns are identical across all substitute parts.

Q: Does moisture sensitivity affect substitution?

A: No. All parts carry MSL 1 (Unlimited) rating, indicating no moisture sensitivity restrictions. Handling and storage requirements are equivalent across all substitute parts.

Q: Can automotive-qualified parts be used in non-automotive applications?

A: Yes. Automotive-qualified parts (SN74HCS165QDRQ1, SN74HCS166QDRQ1) exceed the electrical and reliability specifications of standard-grade parts and are suitable for any application within their specified operating parameters.

Q: What compliance certifications apply to all substitute parts?

A: All parts are ROHS3 compliant and REACH unaffected. Automotive-qualified variants (QDRQ1 suffix) additionally carry AEC-Q100 certification.