74HCT02D,652 NOR Gate IC Equivalent & Substitute Parts

Part Overview

The 74HCT02D,652 is a 4-channel 2-input NOR gate logic IC manufactured by Nexperia USA Inc. in a 14-SOIC surface mount package. This part is classified as obsolete, which necessitates identification of equivalent and substitute components for ongoing design support and procurement continuity. The 74HCT02 logic family provides standard NOR gate functionality suitable for digital logic applications requiring TTL-compatible switching levels and moderate propagation delays.

Key Parameters

Parameter	Value
Logic Type	NOR Gate
Number of Circuits	4
Number of Inputs	2
Voltage Supply Range	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 Range	-40°C to 125°C
Package / Case	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the 74HCT02D,652 is determined by strict equivalence across the following critical parameters:

Logic function: 4-channel 2-input NOR gate
Supply voltage range: 4.5V – 5.5V
Package type: 14-SOIC surface mount
Input/output electrical characteristics: Logic levels, quiescent current, output drive capability
Propagation delay performance at specified conditions

Substitute parts must maintain identical logic functionality, pin configuration, and electrical operating characteristics within the specified voltage and temperature ranges. Packaging format (tube, tape & reel, bulk, cut tape) does not affect functional equivalence but may impact procurement and assembly workflows.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Circuits / Inputs	Supply Voltage	Quiescent Current (Max)	Output Current	Propagation Delay @ 4.5V, 50pF	Operating Temp	Package	Product Status	RoHS Status
74HCT02D,652	Nexperia USA Inc.	NOR Gate	4 / 2	4.5V – 5.5V	2 µA	4mA / 4mA	19ns	-40°C to 125°C	14-SOIC	Obsolete	ROHS3 Compliant
74HCT02D,653	Nexperia USA Inc.	NOR Gate	4 / 2	4.5V – 5.5V	2 µA	4mA / 4mA	19ns	-40°C to 125°C	14-SOIC	Active	ROHS3 Compliant
CD74HCT02M96	Harris Corporation	NOR Gate	4 / 2	4.5V – 5.5V	2 µA	4mA / 4mA	21ns	-55°C to 125°C	14-SOIC	Obsolete	RoHS Non-Compliant
CD74HCT02MT	Texas Instruments	NOR Gate	4 / 2	4.5V – 5.5V	2 µA	4mA / 4mA	21ns	-55°C to 125°C	14-SOIC	Discontinued at DiGi Electronics	ROHS3 Compliant
SN74HCT02D	Texas Instruments	NOR Gate	4 / 2	4.5V – 5.5V	2 µA	4mA / 4mA	18ns @ 5.5V	-40°C to 85°C	14-SOIC	Discontinued at DiGi Electronics	ROHS3 Compliant
SN74HCT02DR	Texas Instruments	NOR Gate	4 / 2	4.5V – 5.5V	2 µA	4mA / 4mA	18ns @ 5.5V	-40°C to 85°C	14-SOIC	Active	ROHS3 Compliant
SN74HCT02DT	Texas Instruments	NOR Gate	4 / 2	4.5V – 5.5V	2 µA	4mA / 4mA	18ns @ 5.5V	-40°C to 85°C	14-SOIC	Discontinued at DiGi Electronics	ROHS3 Compliant

Engineering Selection Recommendations

Primary Substitute (Direct Replacement): 74HCT02D,653 from Nexperia USA Inc. is the direct functional equivalent with identical electrical specifications and propagation delay performance. This part maintains active product status and ROHS3 compliance, providing the most straightforward replacement path for the obsolete 74HCT02D,652.

Secondary Substitutes (Functional Equivalents with Operational Differences): SN74HCT02DR from Texas Instruments is an active product offering improved propagation delay performance (18ns @ 5.5V versus 19ns @ 4.5V) and maintains ROHS3 compliance. The operating temperature range is narrower (-40°C to 85°C versus -40°C to 125°C), which may impact suitability for extended temperature applications.

CD74HCT02MT from Texas Instruments is functionally equivalent but discontinued at DiGi Electronics. This part exhibits slightly higher propagation delay (21ns @ 4.5V) and extended operating temperature range (-55°C to 125°C), suitable for applications requiring broader temperature performance.

Obsolete Alternatives (Not Recommended for New Designs): CD74HCT02M96 from Harris Corporation and SN74HCT02D from Texas Instruments are obsolete or discontinued. CD74HCT02M96 additionally lacks RoHS3 compliance. These parts should be considered only when existing inventory constraints require their use.

Frequently Asked Questions (FAQ)

Q: Can SN74HCT02DR replace 74HCT02D,652 in all applications? A: SN74HCT02DR is functionally equivalent for logic operation and electrical characteristics. However, the operating temperature range is limited to -40°C to 85°C compared to the original -40°C to 125°C. Applications requiring operation above 85°C require alternative selection.

Q: What is the difference between 74HCT02D,652 and 74HCT02D,653? A: Both parts are manufactured by Nexperia USA Inc. and share identical electrical specifications and propagation delay. The primary difference is product status: 74HCT02D,652 is obsolete while 74HCT02D,653 is active. The suffix designates packaging format (652 and 653 indicate different reel configurations).

Q: Are all substitute parts RoHS compliant? A: Most substitutes maintain ROHS3 compliance. CD74HCT02M96 is RoHS non-compliant and should not be used in applications requiring RoHS certification.

Q: Does propagation delay variation affect circuit performance? A: Propagation delay differences (18ns to 21ns) are within typical logic circuit tolerances for standard digital applications. Applications with critical timing requirements should verify compatibility with the specific propagation delay of the selected substitute.

Q: Can these parts be used interchangeably in PCB assembly? A: Yes. All substitute parts use identical 14-SOIC package geometry (0.154", 3.90mm width) and pin configuration, enabling direct PCB footprint compatibility. Packaging format (tube, tape & reel, bulk, cut tape) affects procurement and assembly handling but not electrical or mechanical compatibility.

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