74AHCT02D,112 NOR Gate Logic IC Equivalent & Substitute Parts

Part Overview

The 74AHCT02D,112 is a 4-channel 2-input NOR gate logic IC manufactured by Nexperia USA Inc. in a 14-SOIC surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates within the 4.5V to 5.5V supply voltage range and is suitable for standard TTL-compatible logic applications requiring NOR gate functionality.

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	8mA, 8mA
Input Logic Level - Low	0.8V
Input Logic Level - High	2V
Max Propagation Delay @ V, Max CL	7.5ns @ 5V, 50pF
Operating Temperature	-40°C ~ 125°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 of the 74AHCT02D,112 is determined by strict equivalence across the following critical parameters:

Logic configuration: 4-channel NOR gate with 2 inputs per channel
Electrical specifications: 4.5V ~ 5.5V supply voltage, 2 µA quiescent current, 8mA output drive capability
Timing characteristics: 7.5ns maximum propagation delay at 5V with 50pF load
Input/output logic levels: 0.8V low threshold, 2V high threshold
Package compatibility: 14-SOIC surface mount form factor
Environmental compliance: ROHS3 compliance and MSL Level 1

All substitute parts listed maintain identical electrical performance and pinout compatibility within these parameters. Differences in operating temperature range, product status, and packaging format (tube vs. tape & reel) do not affect functional substitution.

Parameter Comparison

Part Number	Manufacturer	Series	Logic Type	Circuits / Inputs	Supply Voltage	Quiescent Current	Output Drive	Propagation Delay	Operating Temp	Package	Product Status
74AHCT02D,112	Nexperia USA Inc.	74AHCT	NOR Gate	4 / 2	4.5V ~ 5.5V	2 µA	8mA, 8mA	7.5ns @ 5V, 50pF	-40°C ~ 125°C	14-SOIC	Obsolete
MC74VHCT02ADR2G	onsemi	74VHCT	NOR Gate	4 / 2	4.5V ~ 5.5V	2 µA	8mA, 8mA	7.5ns @ 5V, 50pF	-40°C ~ 85°C	14-SOIC	Active
SN74AHCT02D	Texas Instruments	74AHCT	NOR Gate	4 / 2	4.5V ~ 5.5V	2 µA	8mA, 8mA	7.5ns @ 5V, 50pF	-40°C ~ 85°C	14-SOIC	Last Time Buy
SN74AHCT02DG4	Texas Instruments	74AHCT	NOR Gate	4 / 2	4.5V ~ 5.5V	2 µA	8mA, 8mA	7.5ns @ 5V, 50pF	-40°C ~ 85°C	14-SOIC	Last Time Buy
SN74AHCT02DR	Texas Instruments	74AHCT	NOR Gate	4 / 2	4.5V ~ 5.5V	2 µA	8mA, 8mA	7.5ns @ 5V, 50pF	-40°C ~ 85°C	14-SOIC	Active
SN74AHCT02NSR	Texas Instruments	74AHCT	NOR Gate	4 / 2	4.5V ~ 5.5V	2 µA	8mA, 8mA	7.5ns @ 5V, 50pF	-40°C ~ 85°C	14-SO	Active

Engineering Selection Recommendations

For applications currently using the obsolete 74AHCT02D,112, the following selection criteria apply:

Active Product Status Priority: SN74AHCT02DR and SN74AHCT02NSR from Texas Instruments are both active products and represent the most secure long-term sourcing options. MC74VHCT02ADR2G from onsemi is also active and provides equivalent functionality.

Last Time Buy Consideration: SN74AHCT02D and SN74AHCT02DG4 are designated Last Time Buy, indicating limited remaining availability. These parts are suitable for near-term production but not recommended for new long-term designs.

Temperature Range: The original 74AHCT02D,112 specifies -40°C ~ 125°C operation. All substitute parts operate to -40°C ~ 85°C. Applications requiring operation above 85°C cannot use these substitutes without design modification.

Compliance: All listed substitutes maintain ROHS3 compliance and MSL Level 1 rating, matching the original part's environmental certifications.

Packaging Format: SN74AHCT02NSR uses 14-SO (0.209", 5.30mm width) packaging, differing from the standard 14-SOIC (0.154", 3.90mm width) used by other substitutes. Verify PCB footprint compatibility before selection.

Frequently Asked Questions (FAQ)

Q: Can SN74AHCT02DR be used as a direct replacement for 74AHCT02D,112?

A: Yes. SN74AHCT02DR is electrically and functionally equivalent across all critical parameters: logic configuration, supply voltage, output drive capability, propagation delay, and input/output thresholds. Both use 14-SOIC packaging. The primary difference is product status (active vs. obsolete) and packaging format (tape & reel vs. tube).

Q: What is the difference between MC74VHCT02ADR2G and the Texas Instruments alternatives?

A: MC74VHCT02ADR2G is manufactured by onsemi and uses the 74VHCT series designation, while Texas Instruments parts use 74AHCT. Both series are electrically equivalent for this NOR gate function. The onsemi part is active and available in tape & reel packaging. Operating temperature range is -40°C ~ 85°C for all three manufacturers' parts.

Q: Why does SN74AHCT02NSR have a different package designation?

A: SN74AHCT02NSR uses 14-SO packaging (0.209", 5.30mm width) instead of the standard 14-SOIC (0.154", 3.90mm width). This represents a wider package footprint. Verify your PCB design accommodates this package before selection. Electrical performance is identical.

Q: Is the operating temperature range difference significant?

A: The original 74AHCT02D,112 operates to 125°C, while all substitutes operate to 85°C maximum. For applications requiring operation above 85°C, these substitutes are not suitable. For standard industrial and commercial temperature ranges (-40°C ~ 85°C), all substitutes are fully compatible.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL Level 1 rating, matching the environmental certifications of the original 74AHCT02D,112.

Q: Which substitute offers the best long-term availability?

A: SN74AHCT02DR and SN74AHCT02NSR from Texas Instruments and MC74VHCT02ADR2G from onsemi are all designated as active products, providing the most secure long-term sourcing options. SN74AHCT02D and SN74AHCT02DG4 are Last Time Buy and should not be selected for new designs requiring extended production support.

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