74HC4520N,652 Equivalent & Substitute Parts

Part Overview

The 74HC4520N,652 is a binary counter IC manufactured by NXP USA Inc., featuring two 4-bit counter elements with positive and negative trigger capability. This component is classified as obsolete, which necessitates identification of functionally equivalent alternatives for ongoing design support and procurement continuity. The part operates across a wide supply voltage range of 2V to 6V and supports count rates up to 69 MHz, making it suitable for digital counting and frequency division applications in legacy and new designs requiring compatible logic functionality.

Substiute Parts

74HC4520N,652

NXP USA Inc.In Stock: 86174HC4520N,652 Datasheet

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CD74HC4520E

Harris CorporationIn Stock: 2254CD74HC4520E Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HC4520N,652 is determined by strict equivalence across the following critical parameters:

Core Functional Parameters:

• Logic type: Binary Counter
• Number of elements: 2
• Bits per element: 4
• Direction: Up counter
• Reset type: Asynchronous
• Timing: Synchronous
• Trigger type: Positive, Negative

Electrical Parameters:

• Supply voltage range: 2V ~ 6V (minimum overlap required)
• Operating temperature range: Must encompass or match the primary part's range
• Count rate: Must meet or exceed application requirements

Physical Parameters:

• Package type: 16-DIP form factor
• Mounting type: Through Hole
• Pin configuration: Identical pinout required for direct substitution

The CD74HC4520E qualifies as a substitute part based on matching logic type, element count, bit width, counter direction, reset mechanism, timing architecture, and trigger capability. Both parts share the 16-DIP package format and through-hole mounting type, enabling direct board-level replacement without layout modification.

Parameter Comparison

Engineering Selection Recommendations

74HC4520N,652 (NXP USA Inc.):

• ROHS3 compliant; suitable for applications requiring environmental and regulatory compliance
• Higher count rate specification (69 MHz) supports higher-frequency counting applications
• Operating temperature range: -40°C ~ 125°C
• Recommended for new designs where RoHS compliance is mandatory

CD74HC4520E (Harris Corporation):

• RoHS non-compliant; applicable to legacy systems and retrofit applications where compliance is not required
• Extended lower operating temperature limit (-55°C) provides thermal margin for cold-environment applications
• Lower count rate specification (35 MHz) is suitable for standard-frequency counting operations
• Recommended for replacement in existing systems where the NXP part is unavailable

Both parts share identical functional architecture and package format. Selection between them depends on compliance requirements, frequency specifications, and thermal operating conditions of the target application.

Frequently Asked Questions (FAQ)

Q: Can the CD74HC4520E directly replace the 74HC4520N,652 on a PCB?

A: Yes. Both parts use the 16-DIP package with identical pinout and through-hole mounting. Direct board-level substitution is possible without layout modification.

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

A: The main differences are count rate (69 MHz vs. 35 MHz), RoHS compliance status (ROHS3 compliant vs. non-compliant), and operating temperature range (-40°C to 125°C vs. -55°C to 125°C).

Q: Which part should I use for a new design?

A: The 74HC4520N,652 is recommended for new designs due to ROHS3 compliance and higher count rate capability, provided the application does not require the extended lower temperature range of the CD74HC4520E.

Q: Are there any functional differences in counter operation?

A: No. Both parts implement identical binary counter logic with 2 elements, 4 bits per element, asynchronous reset, synchronous timing, and positive/negative trigger capability.

Q: What is the impact of the different count rate specifications?

A: The 74HC4520N,652 supports counting operations up to 69 MHz, while the CD74HC4520E is rated to 35 MHz. Application frequency requirements must not exceed the selected part's count rate specification.

Q: Can I use the CD74HC4520E in an application designed for the 74HC4520N,652?

A: Substitution is valid if the application's maximum counting frequency does not exceed 35 MHz and RoHS compliance is not required. Verify thermal operating conditions fall within -55°C to 125°C range.