CD74HCT4520M Binary Counter IC Equivalent & Substitute Parts

Part Overview

The CD74HCT4520M is a dual 4-bit binary counter IC manufactured by Texas Instruments, housed in a 16-SOIC surface mount package. This logic component functions as a synchronous counter with asynchronous reset capability, supporting both positive and negative trigger types. The device is currently in Last Time Buy status, indicating discontinued production. Identifying equivalent and substitute parts is necessary to ensure design continuity and maintain supply chain reliability for applications requiring this counter functionality.

Key Parameters

Parameter	Value
Logic Type	Binary Counter
Number of Elements	2
Number of Bits per Element	4
Direction	Up
Reset Type	Asynchronous
Timing	Synchronous
Trigger Type	Positive, Negative
Voltage Supply Range	4.5 V ~ 5.5 V
Operating Temperature Range	-55°C ~ 125°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount

Substitute Part Grouping Explanation

Substitution eligibility for the CD74HCT4520M is determined by strict equivalence across the following critical parameters:

Logic Type: Binary Counter (2 elements, 4 bits per element)
Direction: Up counting only
Reset: Asynchronous capability required
Timing: Synchronous operation required
Trigger Type: Positive and Negative edge triggering
Voltage Supply: 4.5 V ~ 5.5 V compatibility
Package: 16-SOIC surface mount form factor
Pin Configuration: Identical 16-pin SOIC layout

The substitute parts listed below meet all functional and electrical requirements for direct replacement. Differences in product status, manufacturing source, and compliance certifications are noted for procurement and design validation purposes.

Parameter Comparison

Parameter	CD74HCT4520M (TI)	CD74HCT4520M96 (Harris)	74HCT4520D,118 (NXP)
Manufacturer	Texas Instruments	Harris Corporation	NXP USA Inc.
Logic Type	Binary Counter	Binary Counter	Binary Counter
Number of Elements	2	2	2
Number of Bits per Element	4	4	4
Direction	Up	Up	Up
Reset Type	Asynchronous	Asynchronous	Asynchronous
Timing	Synchronous	Synchronous	Synchronous
Trigger Type	Positive, Negative	Positive, Negative	Positive, Negative
Voltage Supply	4.5 V ~ 5.5 V	4.5 V ~ 5.5 V	4.5 V ~ 5.5 V
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C
Count Rate	25 MHz	25 MHz	58 MHz
Package / Case	16-SOIC	16-SOIC	16-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Last Time Buy	Obsolete	Active
RoHS Compliance	ROHS3 Compliant	RoHS non-compliant	Not specified

Engineering Selection Recommendations

CD74HCT4520M96 (Harris Corporation): This substitute maintains full functional equivalence with identical electrical specifications and 16-SOIC packaging. However, the part carries Obsolete status and is RoHS non-compliant. Selection of this alternative is appropriate only for legacy system maintenance where RoHS compliance is not a design requirement and supply availability is confirmed.

74HCT4520D,118 (NXP USA Inc.): This substitute provides superior performance characteristics with a 58 MHz count rate compared to the 25 MHz specification of the primary part, while maintaining all functional requirements. The device is currently Active in production status and supports modern compliance standards. The operating temperature minimum is -40°C versus -55°C for the primary part; this represents a narrower range suitable for most commercial and industrial applications. This part is the preferred substitute for new designs and ongoing production requiring current manufacturing support and compliance certifications.

Frequently Asked Questions (FAQ)

Q: Can the 74HCT4520D,118 from NXP be used as a direct replacement for the CD74HCT4520M?

A: Yes. Both devices are functionally equivalent dual 4-bit binary counters in 16-SOIC packages with identical logic operation, trigger types, voltage supply requirements, and pin configurations. The NXP part offers higher count rate performance (58 MHz versus 25 MHz) and maintains Active production status.

Q: What is the significance of the operating temperature range difference between the CD74HCT4520M (-55°C to 125°C) and the 74HCT4520D,118 (-40°C to 125°C)?

A: The CD74HCT4520M supports extended low-temperature operation to -55°C, suitable for military and aerospace applications. The 74HCT4520D,118 operates from -40°C, which covers standard commercial and industrial temperature ranges. Selection depends on the specific application's environmental requirements.

Q: Why is the CD74HCT4520M96 listed as a substitute if it is Obsolete and RoHS non-compliant?

A: The CD74HCT4520M96 maintains complete functional and electrical equivalence with the primary part. It is included for reference in legacy system support scenarios where existing inventory exists and RoHS compliance is not mandated. For new designs, the NXP 74HCT4520D,118 is the recommended alternative.

Q: Are all three parts pin-compatible in 16-SOIC packaging?

A: Yes. All three parts use identical 16-SOIC (0.154", 3.90mm width) surface mount packages with equivalent pin assignments for the dual 4-bit binary counter function.

Q: What compliance certifications should be verified for production use?

A: The CD74HCT4520M is ROHS3 compliant and REACH unaffected. The 74HCT4520D,118 from NXP is the recommended choice for applications requiring current compliance certifications and active manufacturing support. Verify specific compliance requirements with your design and procurement specifications.

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