74HC7266N,652 Equivalent & Substitute Parts

Part Overview

The 74HC7266N,652 is a 4-channel XNOR (Exclusive NOR) logic gate IC manufactured by NXP USA Inc. in a 14-DIP package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations where legacy compatibility is required.

Key Parameters

Parameter	Value
Logic Type	XNOR (Exclusive NOR)
Number of Circuits	4
Number of Inputs	2
Voltage - Supply	2V ~ 6V
Current - Quiescent (Max)	2 µA
Current - Output High, Low	5.2mA, 5.2mA
Input Logic Level - Low	0.5V ~ 1.8V
Input Logic Level - High	1.5V ~ 4.2V
Max Propagation Delay @ 6V, 50pF	20ns
Operating Temperature	-40°C ~ 125°C
Mounting Type	Through Hole
Package / Case	14-DIP (0.300", 7.62mm)
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74HC7266N,652 is determined by strict equivalence across the following critical parameters:

Logic function: XNOR gate with 4 channels and 2 inputs per channel
Supply voltage range: 2V ~ 6V
Output current capability: 5.2mA minimum for both high and low states
Input logic thresholds: Low 0.5V ~ 1.8V, High 1.5V ~ 4.2V
Quiescent current: 2 µA maximum
Package type: 14-DIP through-hole mounting
Physical dimensions: 0.300" (7.62mm) width

The CD74HC7266E qualifies as a substitute based on matching logic function, circuit count, input configuration, supply voltage, output current, input logic levels, quiescent current, and package dimensions. Differences in propagation delay and operating temperature range do not preclude substitution when system timing and thermal requirements are within the substitute's specifications.

Parameter Comparison

Parameter	74HC7266N,652 (NXP)	CD74HC7266E (Harris)	Compatibility
Logic Type	XNOR (Exclusive NOR)	XNOR (Exclusive NOR)	Match
Number of Circuits	4	4	Match
Number of Inputs	2	2	Match
Voltage - Supply	2V ~ 6V	2V ~ 6V	Match
Current - Quiescent (Max)	2 µA	2 µA	Match
Current - Output High, Low	5.2mA, 5.2mA	5.2mA, 5.2mA	Match
Input Logic Level - Low	0.5V ~ 1.8V	0.5V ~ 1.8V	Match
Input Logic Level - High	1.5V ~ 4.2V	1.5V ~ 4.2V	Match
Max Propagation Delay @ 6V, 50pF	20ns	30ns	Substitute slower
Operating Temperature	-40°C ~ 125°C	-55°C ~ 125°C	Substitute wider range
Mounting Type	Through Hole	Through Hole	Match
Package / Case	14-DIP (0.300", 7.62mm)	14-DIP (0.300", 7.62mm)	Match

Engineering Selection Recommendations

The CD74HC7266E is a direct functional substitute for the 74HC7266N,652 based on electrical and mechanical parameter equivalence. Selection between these parts should consider the following factors:

RoHS Compliance: The 74HC7266N,652 is ROHS3 compliant, while the CD74HC7266E is RoHS non-compliant. Applications subject to RoHS regulations must use the NXP part or identify an alternative ROHS3-compliant substitute.

Propagation Delay: The CD74HC7266E exhibits 30ns propagation delay compared to 20ns for the original part. Applications with timing-critical signal paths must confirm that the 10ns difference does not violate system timing requirements.

Operating Temperature Range: The CD74HC7266E supports -55°C to 125°C, extending the lower temperature limit by 15°C. This provides broader thermal operating capability for applications requiring extended low-temperature performance.

Product Status: Both parts are classified as obsolete. Long-term availability cannot be assured for either component. Design teams should evaluate modern logic gate alternatives for new designs.

Frequently Asked Questions (FAQ)

Q: Can the CD74HC7266E directly replace the 74HC7266N,652 in existing designs?

A: Yes, the CD74HC7266E is electrically and mechanically compatible for direct substitution provided that the 10ns increase in propagation delay does not violate system timing specifications and RoHS compliance requirements are not mandated.

Q: What is the primary difference between these two parts?

A: The main differences are propagation delay (20ns vs. 30ns), operating temperature range (-40°C to 125°C vs. -55°C to 125°C), and RoHS compliance status (ROHS3 compliant vs. non-compliant).

Q: Are both parts available in the same package?

A: Yes, both the 74HC7266N,652 and CD74HC7266E use 14-DIP through-hole packaging with identical 0.300" (7.62mm) width, ensuring mechanical compatibility on PCBs designed for either part.

Q: Which part should be selected for new designs?

A: Both parts are obsolete. New designs should evaluate modern CMOS logic gate alternatives that offer current production status, improved performance characteristics, and compliance with current industry standards.

Q: Does the operating temperature range difference affect substitution?

A: The CD74HC7266E's extended lower temperature range (-55°C vs. -40°C) is advantageous for applications requiring broader thermal operation. This difference does not prevent substitution and may provide additional capability.

Q: Is RoHS compliance a factor in selecting between these parts?

A: Yes, if the application or market requires RoHS compliance, the 74HC7266N,652 (ROHS3 compliant) must be used. The CD74HC7266E is RoHS non-compliant and cannot be used in regulated applications.

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