CD74HCT166M Equivalent & Substitute Parts

Part Overview

The CD74HCT166M is an 8-bit parallel-in/serial-out shift register manufactured by Texas Instruments in a 16-SOIC surface mount package. This component is classified as discontinued at DiGi Electronics, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. The part operates within a 4.5V to 5.5V supply voltage range and supports both parallel and serial data input modes, making it suitable for data conversion and signal routing applications in digital logic circuits.

Substiute Parts

CD74HCT166M

Texas InstrumentsIn Stock: 1506CD74HCT166M Datasheet

Current PartRFQ

CD74HCT166M96

Texas InstrumentsIn Stock: 9435CD74HCT166M96 Datasheet

DirectRFQ

74HC75PW,118

NXP SemiconductorsIn Stock: 732174HC75PW,118 Datasheet

MFR RecommendedRFQ

74HCT166D,653

Nexperia USA Inc.In Stock: 321274HCT166D,653 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the CD74HCT166M is determined by strict alignment with the following critical parameters: logic type (shift register), bit width (8-bit), function (parallel or serial to serial conversion), output configuration (push-pull), supply voltage range (4.5V ~ 5.5V), package form factor (16-SOIC), and mounting technology (surface mount). Parts meeting these specifications are considered direct functional equivalents regardless of manufacturer or packaging format (tube versus tape & reel).

The identified substitute parts maintain compatibility across all electrical and mechanical parameters specified for the CD74HCT166M, ensuring pin-for-pin and functional interchangeability within the defined operating envelope.

Parameter Comparison

Engineering Selection Recommendations

CD74HCT166M96 is the primary direct substitute, manufactured by Texas Instruments under the same base product number (74HCT166) with identical electrical specifications and package configuration. This part maintains active product status and is available in tape & reel packaging format, differing only in supply format from the original tube packaging.

74HCT166D,653 manufactured by Nexperia USA Inc. provides functional equivalence with the same 74HCT166 base product number and identical electrical parameters. The operating temperature range is narrower (-40°C ~ 125°C versus -55°C ~ 125°C), which may be a consideration for applications requiring extended low-temperature operation below -40°C. This part is supplied in tape & reel format and maintains active product status.

Both substitute parts carry ROHS3 compliance and MSL rating 1 (Unlimited), matching the environmental and handling requirements of the original CD74HCT166M.

Frequently Asked Questions (FAQ)

Q: Can CD74HCT166M96 be used as a direct replacement for CD74HCT166M?

A: Yes. Both parts share identical electrical specifications, package configuration (16-SOIC), and base product number (74HCT166). The difference is packaging format: CD74HCT166M is supplied in tube format while CD74HCT166M96 is supplied in tape & reel format. Electrical performance and pinout are identical.

Q: What is the difference between CD74HCT166M and 74HCT166D,653?

A: Both are 8-bit shift registers in 16-SOIC packages with identical supply voltage (4.5V ~ 5.5V) and push-pull output configuration. The primary difference is the operating temperature range: CD74HCT166M operates from -55°C to 125°C, while 74HCT166D,653 operates from -40°C to 125°C. For applications requiring operation below -40°C, CD74HCT166M or CD74HCT166M96 are required.

Q: Are all substitute parts RoHS compliant?

A: Yes. CD74HCT166M, CD74HCT166M96, and 74HCT166D,653 are all ROHS3 compliant with MSL rating 1 (Unlimited moisture sensitivity level).

Q: Can I use 74HC75PW,118 as a substitute?

A: No. While 74HC75PW,118 is listed in the original part's substitute field, it is a D latch (different logic type) rather than a shift register. It does not meet the functional requirements for parallel-to-serial or serial-to-serial conversion and is not electrically equivalent.

Q: What packaging formats are available for the 74HCT166 base product?

A: CD74HCT166M is supplied in tube packaging. CD74HCT166M96 and 74HCT166D,653 are supplied in tape & reel (TR) format. Selection between these formats depends on assembly process requirements and order quantities.