SN74HC27D NOR Gate IC Equivalent & Substitute Parts

Part Overview

The SN74HC27D is a 3-channel NOR gate logic IC in 14-SOIC surface mount packaging manufactured by Texas Instruments. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement. The 74HC27 series provides standard logic gating functionality suitable for digital circuit applications requiring NOR gate operations across multiple channels.

Key Parameters

Parameter	Value
Logic Type	NOR Gate
Number of Circuits	3
Number of Inputs	3
Voltage Supply Range	2V to 6V
Operating Temperature Range	-40°C to 85°C
Package Type	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
Max Propagation Delay	15ns @ 6V, 50pF
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the SN74HC27D is determined by strict equivalence across the following parameters: logic type (NOR gate), number of circuits (3), number of inputs (3), supply voltage range (2V to 6V), package type (14-SOIC), and surface mount mounting type. All substitute parts listed maintain these core electrical and mechanical specifications.

The substitute parts are grouped into three categories based on manufacturer and packaging configuration:

Direct Equivalent (Same Packaging): SN74HC27DR maintains identical specifications with Cut Tape and Digi-Reel packaging options.

Upgrade Options (Extended Temperature Range): 74HC27D,653 (Nexperia) and 74HC27D-Q100J (Nexperia) extend the operating temperature range to -40°C to 125°C, providing enhanced thermal performance while maintaining all other electrical parameters.

Automotive Grade Option: 74HC27D-Q100J includes AEC-Q100 automotive qualification, suitable for applications requiring automotive-grade components.

Parameter Comparison

Parameter	SN74HC27D	SN74HC27DR	74HC27D,653	74HC27D-Q100J
Manufacturer	Texas Instruments	Texas Instruments	Nexperia USA Inc.	Nexperia USA Inc.
Logic Type	NOR Gate	NOR Gate	NOR Gate	NOR Gate
Number of Circuits	3	3	3	3
Number of Inputs	3	3	3	3
Voltage Supply	2V to 6V	2V to 6V	2V to 6V	2V to 6V
Operating Temperature	-40°C to 85°C	-40°C to 85°C	-40°C to 125°C	-40°C to 125°C
Max Propagation Delay	15ns @ 6V, 50pF	15ns @ 6V, 50pF	15ns @ 6V, 50pF	15ns @ 6V, 50pF
Package Type	14-SOIC	14-SOIC	14-SO	14-SO
Packaging Format	Tube	Cut Tape & Digi-Reel	Cut Tape & Digi-Reel	Tape & Reel
Product Status	Discontinued	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

For Standard Applications: SN74HC27DR is the direct equivalent replacement, maintaining identical electrical specifications and operating temperature range. This part is actively manufactured by Texas Instruments and available in standard packaging formats.

For Extended Temperature Applications: Both 74HC27D,653 and 74HC27D-Q100J provide expanded operating temperature range to 125°C, suitable for applications requiring enhanced thermal performance. Both parts are actively manufactured and ROHS3 compliant.

For Automotive Applications: 74HC27D-Q100J includes AEC-Q100 automotive qualification and is recommended for automotive-grade circuit designs. This part maintains all electrical specifications while providing automotive-level reliability certification.

Packaging Considerations: The original SN74HC27D was supplied in Tube packaging. Active substitutes are available in Cut Tape, Digi-Reel, and Tape & Reel formats. Selection should align with procurement and assembly requirements.

Frequently Asked Questions (FAQ)

Q: Can SN74HC27DR be used as a direct replacement for SN74HC27D? A: Yes. SN74HC27DR is electrically and mechanically equivalent, maintaining identical logic type, circuit count, input count, supply voltage range, propagation delay, and package type. The primary difference is packaging format and active product status.

Q: What is the difference between the Nexperia substitutes and the Texas Instruments original? A: The Nexperia parts (74HC27D,653 and 74HC27D-Q100J) maintain all core electrical specifications but extend the operating temperature range from 85°C to 125°C. Both are ROHS3 compliant and actively manufactured. 74HC27D-Q100J includes AEC-Q100 automotive qualification.

Q: Are the 14-SOIC and 14-SO packages interchangeable? A: Both packages are 14-pin surface mount packages with identical 0.154" (3.90mm) width. They are mechanically compatible for PCB assembly purposes. Verify specific package dimensions with component datasheets if required.

Q: Which substitute should I select for a new design? A: For new designs, SN74HC27DR (Texas Instruments) or 74HC27D,653 (Nexperia) are recommended based on active manufacturing status and availability. For automotive applications, 74HC27D-Q100J is the appropriate selection.

Q: Are all substitutes ROHS3 compliant? A: Yes. All listed substitute parts maintain ROHS3 compliance, matching the original SN74HC27D specification.

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