SN74AHCT02DG4 Equivalent & Substitute Parts

Part Overview

The SN74AHCT02DG4 is a 4-channel NOR gate logic IC manufactured by Texas Instruments, housed in a 14-SOIC surface mount package. This component is classified as Last Time Buy, indicating limited future availability. The part operates across a 4.5V to 5.5V supply voltage range with a maximum propagation delay of 7.5ns at 5V with 50pF load. Finding equivalent and substitute parts is essential for design continuity, inventory management, and long-term product support given its Last Time Buy status.

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 ~ 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 SN74AHCT02DG4 is determined by strict equivalence across the following critical parameters:

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

Substitute parts are grouped into two categories: direct equivalents (same series, same operating temperature range) and upgraded alternatives (extended temperature range or automotive qualification). All substitutes maintain identical electrical performance and pinout compatibility.

Parameter Comparison

Part Number	Manufacturer	Series	Logic Type	Circuits / Inputs	Supply Voltage	Quiescent Current	Output Drive	Propagation Delay	Operating Temp	Package	Status
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
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
74AHCT02D,118	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	Active
74VHCT02D,118	NXP USA Inc.	74VHCT	NOR Gate	4 / 2	4.5V ~ 5.5V	2 µA	8mA, 8mA	7.5ns @ 5V, 50pF	-40°C ~ 125°C	14-SOIC	Active
74AHCT02D-Q100J	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	Active
74VHCT02D-Q100J	Nexperia USA Inc.	74VHCT	NOR Gate	4 / 2	4.5V ~ 5.5V	2 µA	8mA, 8mA	7.5ns @ 5V, 50pF	-40°C ~ 125°C	14-SOIC	Active

Engineering Selection Recommendations

Direct Equivalents (Same Operating Temperature Range)

SN74AHCT02DR and SN74AHCT02D are direct functional equivalents from Texas Instruments with identical electrical specifications and -40°C to 85°C operating range. SN74AHCT02DR is available in Tape & Reel packaging with higher inventory (5200 pcs), while SN74AHCT02D is available in Tube packaging (2380 pcs). Both parts maintain Active product status, ensuring long-term availability and support.

Upgraded Alternatives (Extended Temperature Range)

74AHCT02D,118 (Nexperia) and 74AHCT02D-Q100J (Nexperia) extend the operating temperature range to -40°C to 125°C while maintaining identical electrical performance. The -Q100J variant includes AEC-Q100 automotive qualification. These parts are suitable for applications requiring extended thermal performance or automotive compliance.

74VHCT02D,118 (NXP) and 74VHCT02D-Q100J (NXP) provide the same extended temperature range and automotive qualification with the 74VHCT series designation. All upgraded alternatives maintain ROHS3 compliance and MSL Level 1 rating.

Selection Criteria

Choose SN74AHCT02DR for immediate replacement with maximum inventory availability. Select 74AHCT02D,118 or 74AHCT02D-Q100J for applications requiring extended temperature operation or automotive qualification. The 74VHCT series variants are functionally equivalent alternatives from NXP with identical electrical specifications.

Frequently Asked Questions (FAQ)

Q: Can I directly replace SN74AHCT02DG4 with SN74AHCT02DR?

A: Yes. Both parts are Texas Instruments 74AHCT series NOR gates with identical electrical specifications, logic function, and 14-SOIC package. The difference is packaging format: DG4 is Tube, DR is Tape & Reel. Pinout and performance are identical.

Q: What is the difference between 74AHCT02 and 74VHCT02 series?

A: Both series provide identical electrical performance for this NOR gate function with the same supply voltage, propagation delay, and output drive specifications. The 74VHCT series is an alternative product line from NXP. Selection between them is based on manufacturer preference and availability.

Q: Are the Nexperia parts (74AHCT02D,118) compatible with the original Texas Instruments part?

A: Yes. The Nexperia 74AHCT02D,118 maintains identical electrical specifications, logic function, and 14-SOIC package compatibility. It offers an extended operating temperature range (-40°C to 125°C versus -40°C to 85°C) and Active product status, making it suitable for long-term designs.

Q: What does the -Q100J suffix indicate?

A: The -Q100J suffix indicates AEC-Q100 automotive qualification. These parts meet automotive industry reliability and qualification standards. They are suitable for automotive applications requiring extended temperature operation and automotive-grade components.

Q: Why should I consider upgraded alternatives with extended temperature range?

A: Extended temperature range parts (-40°C to 125°C) provide design margin for applications operating in high-temperature environments or with thermal stress. They also ensure continued availability as the original Last Time Buy part reaches end-of-life.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance and MSL Level 1 rating, matching the environmental compliance of the original SN74AHCT02DG4.

Q: What packaging options are available for substitutes?

A: SN74AHCT02DR is available in Tape & Reel (TR) format. SN74AHCT02D is available in Tube format. Nexperia and NXP alternatives are available in Tape & Reel (TR) or Bulk packaging. Verify packaging requirements for your assembly process before selection.

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