74HCT02N,652 Equivalent & Substitute Parts

Part Overview

The 74HCT02N,652 is a NOR Gate IC with 4 channels and 2 inputs per channel, manufactured by NXP Semiconductors in a 14-DIP through-hole package. This logic gate is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and component sourcing. The 74HCT series represents a standard logic family with widespread industrial application, and multiple manufacturers produce functionally equivalent alternatives.

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
Operating Temperature	-40°C ~ 125°C
Mounting Type	Through Hole
Package / Case	14-DIP (0.300", 7.62mm)

Substitute Part Grouping Explanation

Substitution of the 74HCT02N,652 is determined by the following critical parameters:

Logic Function: All substitutes must implement a 4-channel NOR gate with 2 inputs per channel
Electrical Specifications: Supply voltage (4.5V ~ 5.5V), quiescent current (2 µA max), output current (4mA), and input logic levels must remain within specification
Propagation Delay: Maximum propagation delay at specified voltage and load capacitance determines functional compatibility
Package Compatibility: Through-hole 14-DIP package is required for direct board-level replacement without layout modification
Operating Temperature Range: Minimum -40°C to +125°C required for industrial applications

Substitutes are grouped into two categories: direct pin-compatible replacements in 14-DIP through-hole packaging, and functionally equivalent alternatives in different package types (surface mount) that require board redesign.

Parameter Comparison

Parameter	74HCT02N,652 (NXP)	CD74HCT02E (Harris)	74HCT02D,653 (Nexperia)	SN74HCT02N (TI)
Manufacturer	NXP Semiconductors	Harris Corporation	Nexperia USA Inc.	Texas Instruments
Product Status	Obsolete	Obsolete	Active	Active
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	19ns @ 4.5V, 50pF	21ns @ 4.5V, 50pF	19ns @ 4.5V, 50pF	18ns @ 5.5V, 50pF
Operating Temperature	-40°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 85°C
Mounting Type	Through Hole	Through Hole	Surface Mount	Through Hole
Package / Case	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	14-SOIC (0.154", 3.90mm Width)	14-DIP (0.300", 7.62mm)
RoHS Status	ROHS3 Compliant	RoHS non-compliant	ROHS3 Compliant	ROHS3 Compliant

Engineering Selection Recommendations

Direct Pin-Compatible Replacements (14-DIP Through-Hole)

For applications requiring no board modification, the following parts provide direct substitution:

SN74HCT02N (Texas Instruments): Active product status with ROHS3 compliance. Operating temperature range limited to -40°C ~ 85°C; verify compatibility with applications requiring extended temperature operation to 125°C. Propagation delay of 18ns @ 5.5V meets or exceeds performance requirements.
CD74HCT02E (Harris Corporation): Functionally equivalent with extended operating temperature range (-55°C ~ 125°C). RoHS non-compliant status requires compliance verification for regulated applications. Propagation delay of 21ns @ 4.5V remains within acceptable limits for most logic applications.

Surface-Mount Alternative (14-SOIC)

74HCT02D,653 (Nexperia USA Inc.): Active product with ROHS3 compliance. Surface-mount 14-SOIC package requires PCB redesign. Identical electrical performance to the main part (19ns propagation delay @ 4.5V). Recommended for new designs or board revisions.

Obsolete Part Consideration

The main part 74HCT02N,652 (NXP) is obsolete. For new production or long-term sourcing, transition to active products (SN74HCT02N or 74HCT02D,653) is recommended.

Frequently Asked Questions (FAQ)

Q: Can I directly replace 74HCT02N,652 with SN74HCT02N without board modification?

A: Yes. Both parts use 14-DIP through-hole packaging with identical pinouts and electrical specifications. Pin-for-pin substitution is possible. Verify that the operating temperature range of -40°C ~ 85°C (SN74HCT02N) meets your application requirements, as the original part supports -40°C ~ 125°C.

Q: What is the difference between CD74HCT02E and the original 74HCT02N,652?

A: Both are 4-channel NOR gates in 14-DIP packages with identical logic function and electrical performance. CD74HCT02E offers extended operating temperature (-55°C ~ 125°C) but is RoHS non-compliant. Propagation delay is slightly higher at 21ns versus 19ns. Pin compatibility is maintained.

Q: Can I use 74HCT02D,653 as a substitute?

A: 74HCT02D,653 is functionally equivalent but uses 14-SOIC surface-mount packaging instead of 14-DIP through-hole. Direct board-level replacement is not possible without PCB redesign. This part is recommended for new designs or board revisions requiring surface-mount components.

Q: Are all substitutes RoHS compliant?

A: No. SN74HCT02N and 74HCT02D,653 are ROHS3 compliant. CD74HCT02E is RoHS non-compliant. Verify compliance requirements for your application before selection.

Q: Which substitute has the fastest propagation delay?

A: SN74HCT02N has the fastest propagation delay at 18ns @ 5.5V. The original part and 74HCT02D,653 both specify 19ns @ 4.5V. CD74HCT02E specifies 21ns @ 4.5V. All values remain within acceptable limits for standard logic applications.

Q: What is the temperature range limitation of SN74HCT02N?

A: SN74HCT02N operates from -40°C to 85°C, which is 40°C narrower than the original part (-40°C ~ 125°C). Applications requiring operation above 85°C must use CD74HCT02E (-55°C ~ 125°C) or verify that the reduced range is acceptable.

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