SN74HC166PWT Equivalent & Substitute Parts

Part Overview

The SN74HC166PWT is an 8-bit parallel-in/serial-out shift register manufactured by Texas Instruments, housed in a 16-TSSOP surface mount package. This logic IC operates across a 2V to 6V supply voltage range and supports temperatures from -40°C to 85°C. The part is currently discontinued at DiGi Electronics, making equivalent and substitute parts essential for ongoing design support and production continuity. Functionally equivalent alternatives maintain the same shift register architecture, bit width, and electrical characteristics while offering different availability, temperature ratings, or automotive qualifications.

Substiute Parts

SN74HC166PWT

Texas InstrumentsIn Stock: 3274SN74HC166PWT Datasheet

Current PartRFQ

SN74HC166AIPWRG4Q1

Texas InstrumentsIn Stock: 24678SN74HC166AIPWRG4Q1 Datasheet

Parametric EquivalentRFQ

SN74HC166PWR

Texas InstrumentsIn Stock: 23519SN74HC166PWR Datasheet

Parametric EquivalentRFQ

74HC166PW,118

Nexperia USA Inc.In Stock: 256074HC166PW,118 Datasheet

UpgradeRFQ

74HC166PW-Q100J

Nexperia USA Inc.In Stock: 610574HC166PW-Q100J Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the SN74HC166PWT is determined by strict parameter matching across the following criteria:

Core Electrical Parameters: All substitute parts must maintain identical logic type (shift register), bit configuration (8-bit, 1 element), function (parallel or serial to serial), output type (push-pull), and supply voltage range (2V ~ 6V).

Package Compatibility: All substitutes use the 16-TSSOP surface mount package with identical physical dimensions (0.173", 4.40mm width), ensuring PCB footprint compatibility without layout modifications.

Compliance & Environmental: All parts maintain ROHS3 compliance, MSL Level 1 (unlimited moisture sensitivity), and REACH unaffected status.

Differentiation Factors: Substitutes vary by manufacturer (Texas Instruments vs. Nexperia USA Inc.), product status (active vs. discontinued), operating temperature range (-40°C to 85°C or -40°C to 125°C), automotive qualification (AEC-Q100), and packaging format (Tape & Reel vs. Cut Tape & Digi-Reel).

Parameter Comparison

Engineering Selection Recommendations

For Standard Industrial Applications: SN74HC166PWR (Texas Instruments, active status) provides direct functional equivalence with identical temperature range and standard grade. Cut Tape & Digi-Reel packaging offers flexibility for lower-volume production runs.

For Extended Temperature Range: 74HC166PW,118 (Nexperia USA Inc.) and 74HC166PW-Q100J (Nexperia USA Inc.) both support -40°C to 125°C operation, providing 40°C additional high-temperature margin compared to the original part.

For Automotive Applications: SN74HC166AIPWRG4Q1 (Texas Instruments, AEC-Q100 qualified) and 74HC166PW-Q100J (Nexperia USA Inc., AEC-Q100 qualified) meet automotive qualification requirements. Both maintain the original -40°C to 85°C temperature range or extend to 125°C respectively.

For Production Continuity: SN74HC166AIPWRG4Q1 offers the highest inventory availability (24,605 pcs) with active product status and Texas Instruments manufacturing continuity.

Frequently Asked Questions (FAQ)

Q: Can I use SN74HC166PWR as a direct replacement for SN74HC166PWT? A: Yes. Both parts share identical electrical parameters, supply voltage range (2V ~ 6V), operating temperature (-40°C ~ 85°C), 8-bit shift register function, and 16-TSSOP package. The primary difference is packaging format (Cut Tape & Digi-Reel vs. Tape & Reel) and current product status (active vs. discontinued).

Q: What is the advantage of using 74HC166PW,118 or 74HC166PW-Q100J? A: Both Nexperia parts extend the operating temperature range to -40°C ~ 125°C, providing additional thermal margin for high-temperature environments. The -Q100J variant adds AEC-Q100 automotive qualification.

Q: Are automotive-qualified parts (AEC-Q100) compatible with non-automotive applications? A: Yes. Automotive-qualified parts meet or exceed standard industrial specifications and are fully compatible with non-automotive designs. They provide additional reliability assurance through enhanced qualification testing.

Q: Does the 16-TSSOP package remain identical across all substitutes? A: Yes. All substitute parts use the 16-TSSOP package with identical physical dimensions (0.173", 4.40mm width), ensuring 100% PCB footprint compatibility without layout changes.

Q: What is the difference between Tape & Reel and Cut Tape & Digi-Reel packaging? A: Tape & Reel (TR) is continuous reel packaging for high-volume automated assembly. Cut Tape (CT) & Digi-Reel is pre-cut tape suitable for lower-volume or mixed-component pick-and-place operations. Both formats contain identical components.

Q: Are all substitutes ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance, MSL Level 1 (unlimited moisture sensitivity), and REACH unaffected status, matching the original SN74HC166PWT environmental certifications.