CD74HC166M Equivalent & Substitute Parts

Part Overview

The CD74HC166M is an 8-bit parallel-in/serial-out shift register manufactured by Texas Instruments, housed in a 16-SOIC surface mount package. This logic component is classified as discontinued at DiGi Electronics, making identification of equivalent and substitute parts essential for ongoing design support and procurement.

The CD74HC166M operates across a supply voltage range of 2V to 6V with an operating temperature range of -55°C to 125°C. Its push-pull output configuration and parallel-or-serial-to-serial function make it suitable for data conversion and signal routing applications in digital systems.

Substiute Parts

CD74HC166M

Texas InstrumentsIn Stock: 1579CD74HC166M Datasheet

Current PartRFQ

CD74HC166M96

Texas InstrumentsIn Stock: 2467CD74HC166M96 Datasheet

DirectRFQ

CD74HC597M

Harris CorporationIn Stock: 2119CD74HC597M Datasheet

Parametric EquivalentRFQ

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 of the CD74HC166M is determined by strict alignment of the following electrical and mechanical parameters:

Critical Substitution Parameters:

• Logic Type: Shift Register
• Number of Bits per Element: 8 Bits
• Function: Parallel or Serial to Serial
• Output Type: Push-Pull
• Voltage - Supply: 2V ~ 6V
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount

Substitute parts are grouped into three categories based on their relationship to the main part:

Direct Packaging Equivalent: Parts with identical electrical specifications but different packaging configurations (Tube vs. Tape & Reel).

Parametric Equivalent: Parts from alternative manufacturers that meet all electrical and mechanical requirements but may differ in base product number or product status.

Manufacturer Recommended Equivalent: Parts explicitly recommended by alternative manufacturers as functional replacements, maintaining full parameter compatibility.

Parameter Comparison

Engineering Selection Recommendations

CD74HC166M96 (Texas Instruments): This part is the direct equivalent of the CD74HC166M with identical electrical specifications and differs only in packaging format (Tape & Reel vs. Tube). Product status is Active, ensuring long-term availability. RoHS3 compliance and MSL rating match the original specification. This is the primary recommended substitute for new procurement.

74HC166D,653 (Nexperia USA Inc.): This manufacturer-recommended equivalent maintains full electrical compatibility with the CD74HC166M across all critical parameters. Product status is Active with ROHS3 compliance and MSL rating of 1. The operating temperature minimum is -40°C compared to -55°C for the original part; this represents a narrower temperature range suitable for applications not requiring extended low-temperature operation. Tape & Reel packaging is standard for high-volume applications.

MC74HC597ADG (onsemi): This parametric equivalent from onsemi meets all electrical and mechanical requirements with Active product status, ROHS3 compliance, and MSL rating of 1. Operating temperature range matches the original specification (-55°C to 125°C). Tube packaging is available for lower-volume requirements.

CD74HC597M (Harris Corporation): This part meets all electrical and mechanical parameters but carries Obsolete product status and RoHS non-compliance. This substitute should be avoided for new designs or applications requiring regulatory compliance.

Frequently Asked Questions (FAQ)

Q: Can CD74HC166M96 be used as a direct replacement for CD74HC166M?

A: Yes. CD74HC166M96 is electrically and mechanically identical to CD74HC166M. The only difference is packaging format: CD74HC166M96 is supplied in Tape & Reel configuration while CD74HC166M is supplied in Tube. Both are manufactured by Texas Instruments with identical electrical specifications, RoHS compliance, and MSL ratings.

Q: What is the difference between the 74HC166 and 74HC597 base product numbers?

A: The 74HC166 and 74HC597 are distinct base product numbers representing different shift register configurations. While both are 8-bit shift registers in 16-SOIC packages with identical electrical parameters (2V-6V supply, push-pull output, parallel-or-serial-to-serial function), they differ in internal logic architecture. Substitution between these families is based on functional equivalence rather than pin-for-pin compatibility.

Q: Why is the operating temperature range different for the 74HC166D,653?

A: The 74HC166D,653 from Nexperia has an operating temperature range of -40°C to 125°C, compared to -55°C to 125°C for the CD74HC166M. This represents a narrower low-temperature specification. For applications operating above -40°C, this part is fully equivalent. Applications requiring operation below -40°C must use parts with the extended -55°C specification.

Q: Is RoHS compliance important for substitute selection?

A: RoHS compliance status is a regulatory and procurement requirement. The CD74HC166M, CD74HC166M96, 74HC166D,653, and MC74HC597ADG are all ROHS3 compliant. The CD74HC597M is RoHS non-compliant and should not be selected for applications subject to RoHS regulations or customer requirements.

Q: What does MSL rating of 1 mean?

A: Moisture Sensitivity Level (MSL) of 1 indicates unlimited shelf life with no moisture sensitivity precautions required. All recommended substitutes carry MSL 1 rating, ensuring identical handling and storage requirements.

Q: Can I use CD74HC597M as a substitute?

A: CD74HC597M meets all electrical and mechanical parameters but carries Obsolete product status and RoHS non-compliance. It is not recommended for new designs or applications requiring regulatory compliance.