CD74HCT02MT NOR Gate IC Equivalent & Substitute Parts

Part Overview

The CD74HCT02MT 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 identification of functional equivalents essential for ongoing design support and production continuity. The 74HCT02 series provides standard logic gating functionality suitable for digital circuit applications requiring NOR logic operations.

Key Parameters

Parameter	Value
Logic Type	NOR Gate
Number of Circuits	4
Number of Inputs	2
Voltage Supply Range	4.5V ~ 5.5V
Output Current (High/Low)	4mA / 4mA
Input Logic Level Low	0.8V
Input Logic Level High	2V
Max Propagation Delay	21ns @ 4.5V, 50pF
Operating Temperature	-55°C ~ 125°C
Package Type	14-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution of the CD74HCT02MT is determined by strict equivalence across the following parameters: logic type (NOR gate), circuit count (4 channels), input count (2 inputs per gate), supply voltage range (4.5V ~ 5.5V), output current capability (4mA minimum), input logic thresholds (0.8V low, 2V high), propagation delay performance, operating temperature range, and package form factor (14-SOIC).

The substitute parts identified fall into two categories:

Parametric Equivalent: CD74HCT02M96 matches all electrical specifications and package requirements but differs in packaging format (Bulk vs. Tape & Reel) and compliance status.

Manufacturer Recommended Equivalents: 74HCT02D,653 and 74HCT02D-Q100,118 (both from Nexperia USA Inc.) provide full functional equivalence with identical electrical parameters, active product status, and superior compliance certifications. The 74HCT02D-Q100,118 variant includes AEC-Q100 automotive qualification.

Non-Equivalent Part: 74HCT374D,652 is a D-type flip-flop with fundamentally different logic function and cannot substitute for NOR gate applications.

Parameter Comparison

Parameter	CD74HCT02MT (Main)	CD74HCT02M96	74HCT02D,653	74HCT02D-Q100,118
Manufacturer	Texas Instruments	Harris Corporation	Nexperia USA Inc.	Nexperia USA Inc.
Logic Type	NOR Gate	NOR Gate	NOR Gate	NOR Gate
Circuits / Inputs	4 / 2	4 / 2	4 / 2	4 / 2
Voltage Supply	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Output Current	4mA / 4mA	4mA / 4mA	4mA / 4mA	4mA / 4mA
Input Logic Levels	0.8V / 2V	0.8V / 2V	0.8V / 2V	0.8V / 2V
Max Propagation Delay	21ns @ 4.5V, 50pF	21ns @ 4.5V, 50pF	19ns @ 4.5V, 50pF	19ns @ 4.5V, 50pF
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package	14-SOIC	14-SOIC	14-SO	14-SO
Packaging Format	Tape & Reel (TR)	Bulk	Cut Tape (CT) & Digi-Reel®	Tape & Reel (TR)
Product Status	Discontinued	Obsolete	Active	Active
RoHS Status	ROHS3 Compliant	Non-compliant	ROHS3 Compliant	ROHS3 Compliant
MSL Rating	1 (Unlimited)	Not specified	1 (Unlimited)	1 (Unlimited)
Automotive Grade	None	None	None	AEC-Q100

Engineering Selection Recommendations

For applications requiring direct replacement of the CD74HCT02MT, the 74HCT02D,653 and 74HCT02D-Q100,118 from Nexperia USA Inc. are the primary selections. Both parts maintain active product status, full ROHS3 compliance, and identical electrical performance. The 74HCT02D-Q100,118 is specified for automotive applications with AEC-Q100 qualification and should be selected for automotive or high-reliability environments.

The CD74HCT02M96 provides parametric equivalence but carries obsolete status and non-compliant RoHS classification, limiting its suitability for new designs or regulated applications.

The 74HCT374D,652 is functionally incompatible and cannot serve as a substitute due to its D-type flip-flop architecture, which performs a different logic function than the NOR gate.

Frequently Asked Questions (FAQ)

Q: Can the CD74HCT02M96 be used as a direct replacement for the CD74HCT02MT?

A: The CD74HCT02M96 matches all electrical specifications and package dimensions. However, it carries obsolete product status and non-compliant RoHS classification. For new designs or regulated applications, the active Nexperia parts are preferred.

Q: What is the difference between 74HCT02D,653 and 74HCT02D-Q100,118?

A: Both parts are electrically identical NOR gate ICs from Nexperia with active status and ROHS3 compliance. The 74HCT02D-Q100,118 includes AEC-Q100 automotive qualification and should be used for automotive applications. The 74HCT02D,653 is suitable for general industrial and commercial applications.

Q: Why is the operating temperature range different between the main part and some substitutes?

A: The CD74HCT02MT specifies -55°C ~ 125°C, while the Nexperia equivalents specify -40°C ~ 125°C. The narrower range of the Nexperia parts does not affect compatibility in most applications operating within -40°C ~ 125°C. Applications requiring extended low-temperature operation below -40°C must retain the original part or verify alternative sources.

Q: Are the 14-SOIC and 14-SO packages physically compatible?

A: The 14-SOIC and 14-SO packages are mechanically equivalent with identical 0.154" (3.90mm) width and pin spacing. Both are surface mount packages suitable for the same PCB footprints.

Q: Can the 74HCT374D,652 replace the CD74HCT02MT?

A: No. The 74HCT374D,652 is a D-type flip-flop with 8-bit storage capability, not a NOR gate. It performs a fundamentally different logic function and is not compatible with circuits designed for 4-channel 2-input NOR gate operation.

Q: What packaging options are available for the substitute parts?

A: The 74HCT02D,653 is available in Cut Tape (CT) and Digi-Reel® format. The 74HCT02D-Q100,118 is supplied in Tape & Reel (TR) format, matching the original CD74HCT02MT packaging. Select based on your procurement and assembly requirements.

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