CD74HCT27M NOR Gate IC Equivalent & Substitute Parts

Part Overview

The CD74HCT27M is a 3-channel NOR gate logic IC manufactured by Texas Instruments in a 14-SOIC surface mount package. This component implements three independent 3-input NOR logic functions and operates across the 4.5V to 5.5V supply voltage range. The part is currently discontinued at DiGi Electronics, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

CD74HCT27M

Texas InstrumentsIn Stock: 4524CD74HCT27M Datasheet

Current PartRFQ

CD74HCT27M96

Texas InstrumentsIn Stock: 2185CD74HCT27M96 Datasheet

DirectRFQ

74HCT173D,653

Nexperia USA Inc.In Stock: 412574HCT173D,653 Datasheet

MFR RecommendedRFQ

74HCT27D,653

NXP SemiconductorsIn Stock: 475074HCT27D,653 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution for the CD74HCT27M is determined by strict equivalence across the following critical parameters:

• Logic function (NOR Gate with 3 channels, 3 inputs per channel)
• Electrical specifications (4.5V ~ 5.5V supply, 4mA output current, 23ns propagation delay)
• Package type (14-SOIC surface mount)
• Operating temperature range (-55°C ~ 125°C)
• Compliance certifications (ROHS3, REACH Unaffected)

The CD74HCT27M96 is a direct equivalent, differing only in packaging format (Tape & Reel versus Tube). The 74HCT27D,653 from NXP Semiconductors is functionally equivalent with identical logic specifications and package dimensions. The 74HCT173D,653 is a different logic function (D-Type Flip Flop) and is not a direct substitute for NOR gate applications.

Parameter Comparison

Engineering Selection Recommendations

For applications requiring the CD74HCT27M NOR gate function, the CD74HCT27M96 is the primary substitute. Both parts are manufactured by Texas Instruments, share identical electrical and functional specifications, and differ only in packaging format. The CD74HCT27M96 maintains active product status and full compliance certifications.

The 74HCT27D,653 from NXP Semiconductors provides functional equivalence for the NOR gate logic operation within the 14-SOIC package. This part is actively manufactured and ROHS3 compliant. Selection between Texas Instruments and NXP sources depends on supply chain availability and procurement requirements.

The 74HCT173D,653 is not suitable as a substitute, as it implements D-Type Flip Flop logic rather than NOR gate functionality and serves a different circuit application.

Frequently Asked Questions (FAQ)

Q: Can the CD74HCT27M96 be used as a direct replacement for the CD74HCT27M?

A: Yes. Both parts are identical in electrical performance, logic function, and package dimensions. The only difference is packaging format: CD74HCT27M ships in Tube format while CD74HCT27M96 ships in Tape & Reel. PCB assembly and circuit operation are unaffected by this packaging difference.

Q: Is the 74HCT27D,653 from NXP a compatible substitute?

A: Yes, for NOR gate applications. The 74HCT27D,653 provides the same 3-channel, 3-input NOR gate logic in the 14-SOIC package with matching supply voltage specifications. It is actively manufactured and ROHS3 compliant.

Q: Why is the 74HCT173D,653 listed but not recommended as a substitute?

A: The 74HCT173D,653 implements D-Type Flip Flop logic, not NOR gate logic. It serves a different functional purpose in digital circuits and cannot replace the CD74HCT27M in NOR gate applications.

Q: What are the critical parameters for substitution?

A: Logic function (NOR Gate), number of channels (3), inputs per channel (3), supply voltage range (4.5V ~ 5.5V), package type (14-SOIC), and operating temperature range (-55°C ~ 125°C) must all match for functional equivalence.

Q: Does packaging format affect circuit performance?

A: No. Tube and Tape & Reel packaging formats contain identical components. The packaging format affects only handling, storage, and assembly line compatibility, not electrical or functional performance.