CD74HC166MG4 Equivalent & Substitute Parts

Part Overview

The CD74HC166MG4 is an 8-bit parallel-load shift register manufactured by Texas Instruments, housed in a 16-SOIC surface mount package. This component functions as a parallel or serial to serial converter, commonly used in digital logic applications requiring data shifting and serialization. The part is discontinued at DiGi Electronics, making equivalent substitutes necessary for ongoing production and maintenance applications.

Substiute Parts

CD74HC166MG4

Texas InstrumentsIn Stock: 925CD74HC166MG4 Datasheet

Current PartRFQ

CD74HC597M

Harris CorporationIn Stock: 2119CD74HC597M Datasheet

Parametric EquivalentRFQ

CD74HC166M

Texas InstrumentsIn Stock: 1579CD74HC166M Datasheet

MFR RecommendedRFQ

74HC166D,653

Nexperia USA Inc.In Stock: 328474HC166D,653 Datasheet

MFR RecommendedRFQ

MC74HC597ADG

onsemiIn Stock: 1800MC74HC597ADG Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CD74HC166MG4 is determined by strict equivalence across the following parameters: 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 Range (2V ~ 6V), Package Type (16-SOIC), and Mounting Type (Surface Mount). Parts meeting all these criteria are classified as direct substitutes. Operating temperature range and RoHS compliance status are secondary considerations for application-specific requirements.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring ROHS3 compliance and active product status, the 74HC166D,653 (Nexperia USA Inc.) and MC74HC597ADG (onsemi) are the preferred substitutes. Both parts are currently active in production and meet all electrical and mechanical equivalence criteria. The 74HC166D,653 operates across a narrower temperature range (-40°C ~ 125°C) compared to the original part; applications requiring the full -55°C ~ 125°C range should select MC74HC597ADG or CD74HC166M. The CD74HC166M (Texas Instruments) provides direct manufacturer continuity but is discontinued at DiGi Electronics. The CD74HC597M (Harris Corporation) is obsolete and non-compliant with ROHS3 standards; selection of this part is not recommended for new designs.

Frequently Asked Questions (FAQ)

Q: Can CD74HC597M be used as a direct substitute for CD74HC166MG4? A: CD74HC597M meets all electrical and mechanical parameters for substitution. However, it is classified as obsolete and does not comply with ROHS3 standards. Use only in applications where RoHS compliance is not required.

Q: What is the difference between CD74HC166M and 74HC166D,653? A: Both parts are electrically equivalent 8-bit shift registers in 16-SOIC packages. CD74HC166M is manufactured by Texas Instruments and is discontinued at DiGi Electronics. 74HC166D,653 is manufactured by Nexperia USA Inc. and maintains active product status. The 74HC166D,653 operates at -40°C minimum temperature versus -55°C for CD74HC166M.

Q: Is MC74HC597ADG compatible with CD74HC166MG4 in all applications? A: MC74HC597ADG is electrically and mechanically equivalent across all specified parameters, including the full -55°C ~ 125°C operating temperature range and ROHS3 compliance. It is suitable for direct substitution in all applications where the original part was used.

Q: What packaging options are available for these substitutes? A: All substitute parts are available in 16-SOIC surface mount packages with 0.154" (3.90mm) width. Packaging formats vary by manufacturer: CD74HC597M and MC74HC597ADG are supplied in Tube; CD74HC166M is supplied in Tube; 74HC166D,653 is supplied in Tape & Reel (TR).

Q: Are there temperature range limitations when substituting parts? A: The 74HC166D,653 operates at -40°C minimum temperature, which is 15°C higher than the original CD74HC166MG4 (-55°C minimum). Applications requiring operation below -40°C must use CD74HC166M or MC74HC597ADG.