SN74HCT02D NOR Gate IC Equivalent & Substitute Parts

Part Overview

The SN74HCT02D is a 4-channel 2-input NOR gate logic IC manufactured by Texas Instruments in a 14-SOIC surface mount package. This part is currently discontinued at DiGi Electronics, making substitute parts necessary for ongoing production and maintenance applications. The 74HCT02 logic family provides standard NOR gate functionality suitable for digital logic circuits requiring TTL-compatible switching at 4.5V to 5.5V supply voltages.

Key Parameters

Parameter	Value
Logic Type	NOR Gate
Number of Circuits	4
Number of Inputs	2
Voltage - Supply	4.5V ~ 5.5V
Current - Quiescent (Max)	2 µA
Current - Output High, Low	4mA, 4mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ V, Max CL	18ns @ 5.5V, 50pF
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	14-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the SN74HCT02D is determined by the following critical parameters:

Logic Function: NOR gate with 4 channels and 2 inputs per channel
Electrical Specifications: Supply voltage 4.5V ~ 5.5V, quiescent current 2 µA maximum, output current 4mA
Timing Performance: Propagation delay specifications
Package Compatibility: 14-SOIC surface mount package with 0.154" width
Compliance: ROHS3 compliance and MSL Level 1

Substitute parts must maintain identical logic function, electrical operating range, and package footprint. Variations in propagation delay, operating temperature range, and packaging format (tape & reel vs. cut tape) are permitted when the core electrical and functional parameters remain equivalent.

Parameter Comparison

Parameter	SN74HCT02D (Main)	SN74HCT02DR	74HCT02D,653	74HCT02D-Q100,118
Manufacturer	Texas Instruments	Texas Instruments	Nexperia USA Inc.	Nexperia USA Inc.
Logic Type	NOR Gate	NOR Gate	NOR Gate	NOR Gate
Number of Circuits	4	4	4	4
Number of Inputs	2	2	2	2
Voltage - Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Current - Quiescent (Max)	2 µA	2 µA	2 µA	2 µA
Current - Output High, Low	4mA, 4mA	4mA, 4mA	4mA, 4mA	4mA, 4mA
Input Logic Level - Low	0.8V	0.8V	0.8V	0.8V
Input Logic Level - High	2V	2V	2V	2V
Max Propagation Delay @ V, Max CL	18ns @ 5.5V, 50pF	18ns @ 5.5V, 50pF	19ns @ 4.5V, 50pF	19ns @ 4.5V, 50pF
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 125°C	-40°C ~ 125°C
Product Status	Discontinued	Active	Active	Active
Packaging Format	Tube	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)
Package / Case	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)	14-SOIC (0.154", 3.90mm Width)
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
MSL	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

SN74HCT02DR (Texas Instruments, Active Status): Direct functional equivalent with identical electrical specifications and propagation delay. Available in cut tape and Digi-Reel packaging formats. Maintains the original -40°C to 85°C operating temperature range. Recommended for applications requiring exact performance matching to the discontinued SN74HCT02D.

74HCT02D,653 (Nexperia USA Inc., Active Status): Functionally equivalent NOR gate with extended operating temperature range (-40°C to 125°C). Propagation delay specification of 19ns at 4.5V is marginally higher than the original 18ns at 5.5V. Suitable for applications requiring wider temperature operation. Available in cut tape and Digi-Reel formats.

74HCT02D-Q100,118 (Nexperia USA Inc., Active Status, AEC-Q100 Qualified): Automotive-grade variant with AEC-Q100 qualification and extended temperature range (-40°C to 125°C). Identical electrical specifications to 74HCT02D,653. Specified for automotive and high-reliability applications. Available in tape and reel packaging.

All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and identical 14-SOIC package footprint, ensuring direct PCB compatibility.

Frequently Asked Questions (FAQ)

Q: Can SN74HCT02DR be used as a direct replacement for SN74HCT02D?

A: Yes. The SN74HCT02DR is a direct functional equivalent manufactured by Texas Instruments with identical logic function, electrical specifications, propagation delay, and operating temperature range. The primary difference is packaging format (cut tape/Digi-Reel vs. tube).

Q: What is the difference between the Nexperia variants 74HCT02D,653 and 74HCT02D-Q100,118?

A: Both parts are functionally equivalent with identical electrical specifications. The 74HCT02D-Q100,118 carries AEC-Q100 automotive qualification and is specified for automotive applications. The 74HCT02D,653 is the standard industrial variant. Both support extended operating temperature (-40°C to 125°C) compared to the original part's -40°C to 85°C range.

Q: Are all substitute parts compatible with the same PCB footprint?

A: Yes. All substitute parts use the 14-SOIC package with 0.154" (3.90mm) width, ensuring identical PCB footprint compatibility without layout modifications.

Q: Does the propagation delay difference between 18ns and 19ns affect circuit performance?

A: The 1ns difference falls within typical design margins for standard logic applications. The 74HCT02D,653 and 74HCT02D-Q100,118 specifications of 19ns at 4.5V remain within acceptable timing parameters for most 74HCT logic circuits. Applications with critical timing requirements should verify compatibility with system clock frequencies.

Q: What packaging formats are available for each substitute?

A: SN74HCT02DR is available in cut tape and Digi-Reel formats. 74HCT02D,653 is available in cut tape and Digi-Reel formats. 74HCT02D-Q100,118 is available in tape and reel format. Select based on production volume and assembly equipment requirements.

Q: Are all substitute parts RoHS compliant?

A: Yes. All substitute parts maintain ROHS3 compliance and MSL Level 1 rating, meeting environmental and reliability standards equivalent to the original SN74HCT02D.

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