CD74HC166MT Equivalent & Substitute Parts

Part Overview

The CD74HC166MT is an 8-bit parallel-load shift register manufactured by Texas Instruments, housed in a 16-SOIC surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The CD74HC166MT operates across a 2V to 6V supply voltage range with a -55°C to 125°C operating temperature specification, serving applications requiring parallel-to-serial or serial-to-serial data conversion in logic circuits.

Substiute Parts

CD74HC166MT

Texas InstrumentsIn Stock: 707CD74HC166MT Datasheet

Current PartRFQ

CD74HC166M96

Texas InstrumentsIn Stock: 2467CD74HC166M96 Datasheet

Parametric EquivalentRFQ

CD74HC597M96

Texas InstrumentsIn Stock: 74360CD74HC597M96 Datasheet

Parametric EquivalentRFQ

CD74HC597MT

Texas InstrumentsIn Stock: 7051CD74HC597MT Datasheet

Parametric EquivalentRFQ

74HC166D,653

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

MFR RecommendedRFQ

MC74HC597ADR2G

onsemiIn Stock: 32698MC74HC597ADR2G Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CD74HC166MT is determined by strict parameter matching across the following criteria:

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

Substitute parts are grouped into two categories: parametric equivalents (identical electrical and mechanical specifications) and manufacturer-recommended alternatives (functionally equivalent with minor specification variations).

Parameter Comparison

Engineering Selection Recommendations

For applications currently using the obsolete CD74HC166MT, the following selection criteria apply:

Primary Recommendation: CD74HC166M96 (Texas Instruments) is the direct parametric equivalent with identical electrical specifications and operating range. This part maintains active product status and is available in Tape & Reel packaging, suitable for high-volume production environments.

Alternative from Nexperia: 74HC166D,653 (Nexperia USA Inc.) provides an active, manufacturer-recommended substitute with the same base product number (74HC166) and package footprint. The operating temperature range is -40°C to 125°C, which is acceptable for applications not requiring the full -55°C lower limit.

Cross-Function Alternatives: CD74HC597M96, CD74HC597MT, and MC74HC597ADR2G are parametric equivalents based on the 74HC597 base product number. These parts maintain identical electrical specifications, voltage supply range, and package dimensions. Selection among these depends on packaging requirements (Tape & Reel versus Cut Tape) and product status considerations. CD74HC597MT carries a Last Time Buy status, indicating limited future availability.

All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and push-pull output configuration, ensuring compatibility with existing circuit designs.

Frequently Asked Questions (FAQ)

Q: Can CD74HC166M96 be used as a direct replacement for CD74HC166MT?

A: Yes. CD74HC166M96 is a parametric equivalent with identical electrical specifications, operating temperature range (-55°C to 125°C), supply voltage (2V to 6V), and 16-SOIC package dimensions. The primary difference is packaging format: CD74HC166MT is supplied in tube format, while CD74HC166M96 is supplied in Tape & Reel. Both are suitable for circuit-level substitution.

Q: What is the difference between CD74HC166 and CD74HC597 base product numbers?

A: Both are 8-bit shift registers in 16-SOIC packages with identical electrical specifications and operating ranges. The base product number distinction reflects different internal logic configurations. Substitution between these families is permissible only when the specific shift register function (parallel-load versus serial-load configuration) is compatible with the application circuit.

Q: Why is 74HC166D,653 from Nexperia listed as a substitute if the operating temperature range differs?

A: The 74HC166D,653 operates from -40°C to 125°C, compared to the CD74HC166MT range of -55°C to 125°C. This represents a narrower lower temperature limit. For applications operating above -40°C, this part is fully equivalent. Applications requiring operation below -40°C must use alternatives with the full -55°C specification.

Q: What does "Last Time Buy" status mean for CD74HC597MT?

A: Last Time Buy indicates the manufacturer has announced end-of-life for this part number. Existing inventory may be available, but future production is not planned. For new designs or long-term procurement, active status parts (CD74HC597M96 or MC74HC597ADR2G) are recommended.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL Level 1 (Unlimited) moisture sensitivity rating, matching the original CD74HC166MT specifications.

Q: Does packaging format (Tube, Tape & Reel, Cut Tape) affect electrical performance?

A: No. Packaging format affects only procurement, handling, and assembly processes. Electrical performance and specifications remain identical regardless of packaging type. Selection should be based on production volume and assembly equipment compatibility.