SN74HC02DT NOR Gate IC Equivalent & Substitute Parts

Part Overview

The SN74HC02DT is a 4-channel 2-input NOR gate logic IC manufactured by Texas Instruments in 14-SOIC surface mount packaging. This part is discontinued at DiGi Electronics, making equivalent and substitute parts necessary for ongoing design support and procurement. The SN74HC02DT operates across a 2V to 6V supply voltage range with low quiescent current and is suitable for general-purpose logic applications requiring NOR gate functionality.

Key Parameters

Parameter	Value
Logic Type	NOR Gate
Number of Circuits	4
Number of Inputs	2
Voltage - Supply	2V ~ 6V
Current - Quiescent (Max)	2 µA
Current - Output High, Low	5.2mA, 5.2mA
Input Logic Level - Low	0.5V ~ 1.8V
Input Logic Level - High	1.5V ~ 4.2V
Max Propagation Delay @ 6V, 50pF	15ns
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 SN74HC02DT is determined by strict equivalence across the following critical parameters:

Logic Type: 4-channel 2-input NOR gate
Supply Voltage Range: 2V ~ 6V minimum
Output Current Capability: 5.2mA minimum for both high and low states
Input Logic Levels: 0.5V ~ 1.8V (low), 1.5V ~ 4.2V (high)
Propagation Delay: 15ns maximum at 6V, 50pF load
Operating Temperature: Minimum -40°C ~ 85°C
Package: 14-SOIC surface mount
Compliance: ROHS3 Compliant

Substitute parts are grouped into three categories:

Parametric Equivalents maintain identical electrical specifications and package format. These parts are direct functional replacements with no design modifications required.

Direct Manufacturer Alternatives are from different manufacturers but meet or exceed all critical electrical parameters and package requirements. These parts may have improved performance characteristics (lower quiescent current, faster propagation delay, or extended temperature range).

Upgrade Parts offer enhanced specifications such as extended operating temperature ranges or automotive-grade qualifications while maintaining backward compatibility with the original design.

Parameter Comparison

Part Number	Manufacturer	Product Status	Quiescent Current (Max)	Propagation Delay @ 6V, 50pF	Operating Temperature	Package	Inventory
SN74HC02DT	Texas Instruments	Discontinued at DiGi Electronics	2 µA	15ns	-40°C ~ 85°C	14-SOIC	888 Pcs
SN74HC02DR	Texas Instruments	Active	2 µA	15ns	-40°C ~ 85°C	14-SOIC	2125 Pcs
SN74HC02DRG4	Texas Instruments	Discontinued at DiGi Electronics	2 µA	15ns	-40°C ~ 85°C	14-SOIC	10790 Pcs
MC74HC02ADR2G	onsemi	Active	1 µA	13ns	-55°C ~ 125°C	14-SOIC	7779 Pcs
MM74HC02M	Fairchild Semiconductor	Active	2 µA	15ns	-40°C ~ 85°C	14-SOIC	3072 Pcs
74HC02D,653	Nexperia USA Inc.	Active	2 µA	15ns	-40°C ~ 125°C	14-SOIC	990300 Pcs
74HC02D-Q100,118	Nexperia USA Inc.	Active	2 µA	15ns	-40°C ~ 125°C	14-SOIC	3241 Pcs
74HC02D/AUJ	Nexperia USA Inc.	Active	2 µA	15ns	-40°C ~ 125°C	14-SOIC	736 Pcs
MC74HC02ADG	onsemi	Active	1 µA	13ns	-55°C ~ 125°C	14-SOIC	2100 Pcs
MM74HC02MX	onsemi	Active	2 µA	15ns	-40°C ~ 85°C	14-SOIC	16095 Pcs

Engineering Selection Recommendations

For Direct Replacement (No Design Changes Required):

SN74HC02DR is the primary recommendation. Manufactured by Texas Instruments with identical electrical specifications to the SN74HC02DT, this part maintains full compatibility while offering active product status and improved availability (2125 units in stock).

For Enhanced Performance:

MC74HC02ADR2G and MC74HC02ADG from onsemi provide superior specifications with reduced quiescent current (1 µA versus 2 µA) and faster propagation delay (13ns versus 15ns). Both parts support extended operating temperature range (-55°C ~ 125°C) and are actively produced. MC74HC02ADR2G is supplied in cut tape packaging, while MC74HC02ADG is supplied in tube packaging.

For Extended Temperature Range Applications:

The Nexperia USA Inc. 74HC02D series (74HC02D,653, 74HC02D-Q100,118, and 74HC02D/AUJ) extends the operating temperature range to -40°C ~ 125°C while maintaining all other electrical parameters. The 74HC02D-Q100,118 variant includes AEC-Q100 automotive qualification for applications requiring automotive-grade components.

For Maximum Availability:

74HC02D,653 from Nexperia USA Inc. offers the highest inventory level (990300 units) with active product status and extended temperature range support.

Frequently Asked Questions (FAQ)

Q: Can I use SN74HC02DR as a direct replacement for SN74HC02DT?

A: Yes. SN74HC02DR is a parametric equivalent with identical electrical specifications, supply voltage range, output current capability, propagation delay, and operating temperature range. Both parts use 14-SOIC packaging and are ROHS3 compliant. The primary difference is product status: SN74HC02DR is actively produced while SN74HC02DT is discontinued at DiGi Electronics.

Q: What are the advantages of using MC74HC02ADR2G instead of SN74HC02DR?

A: MC74HC02ADR2G offers lower quiescent current consumption (1 µA versus 2 µA), faster propagation delay (13ns versus 15ns), and extended operating temperature range (-55°C ~ 125°C versus -40°C ~ 85°C). These improvements are beneficial for battery-powered applications and designs requiring operation in extreme temperature environments.

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

A: All substitute parts listed use 14-SOIC surface mount packaging with identical physical dimensions (0.154" width, 3.90mm). PCB footprints are fully compatible across all listed parts.

Q: Which substitute part should I select for automotive applications?

A: 74HC02D-Q100,118 from Nexperia USA Inc. is qualified to AEC-Q100 automotive standards and extends the operating temperature range to -40°C ~ 125°C. This part is specifically designed for automotive-grade component requirements.

Q: Do all substitute parts meet ROHS3 compliance?

A: All listed substitute parts are ROHS3 compliant. Compliance certifications are consistent across the entire substitute parts list.

Q: What is the difference between cut tape and tube packaging options?

A: Cut tape (CT) and Digi-Reel packaging are suitable for automated pick-and-place assembly equipment. Tube packaging is suitable for manual assembly or lower-volume production. Electrical specifications and performance are identical regardless of packaging format.

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