CD74HC4520MT Binary Counter IC Equivalent & Substitute Parts

Part Overview

The CD74HC4520MT 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 count rates up to 35 MHz across a 2V to 6V supply range. The part is classified as Last Time Buy, indicating discontinued production status. 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
Count Rate	35 MHz
Trigger Type	Positive, Negative
Voltage - Supply	2 V ~ 6 V
Operating Temperature	-55°C ~ 125°C
Package / Case	16-SOIC (0.154", 3.90mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the CD74HC4520MT is determined by strict alignment with the following critical parameters:

Logic Type: Binary Counter (2 elements, 4 bits per element)
Direction: Up counter
Reset: Asynchronous
Timing: Synchronous
Trigger Type: Positive and Negative edge capability
Voltage Supply Range: 2V to 6V minimum
Package: 16-SOIC surface mount form factor
Base Product Number: 74HC4520 series

Substitute parts must maintain identical functional architecture and pinout compatibility. Count rate performance may vary within acceptable operational margins. Operating temperature range and product status are secondary considerations that do not disqualify functional equivalence.

Parameter Comparison

Parameter	CD74HC4520MT (Main)	CD74HC4520M96 (Substitute)	74HC4520D,118 (Substitute)
Manufacturer	Texas Instruments	Texas Instruments	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
Count Rate	35 MHz	35 MHz	69 MHz
Trigger Type	Positive, Negative	Positive, Negative	Positive, Negative
Voltage - Supply	2 V ~ 6 V	2 V ~ 6 V	2 V ~ 6 V
Operating Temperature	-55°C ~ 125°C	-55°C ~ 125°C	-40°C ~ 125°C
Package / Case	16-SOIC	16-SOIC	16-SOIC
Mounting Type	Surface Mount	Surface Mount	Surface Mount
Product Status	Last Time Buy	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	Not specified

Engineering Selection Recommendations

CD74HC4520M96 qualifies as a parametric equivalent substitute. Manufactured by Texas Instruments under the same base product number (74HC4520), this part maintains identical electrical specifications and package configuration. Active product status ensures ongoing availability and supply chain stability. ROHS3 compliance aligns with environmental regulatory requirements.

74HC4520D,118 from NXP USA Inc. (Nexperia) functions as a manufacturer-recommended alternative. While operating temperature range is narrower (-40°C to 125°C versus -55°C to 125°C), all critical functional parameters remain compatible. The elevated count rate specification (69 MHz) exceeds the original requirement and presents no operational constraint. Active product status and 16-SOIC packaging ensure direct PCB compatibility. RoHS compliance status is not specified in available documentation.

Both substitutes maintain pinout compatibility and functional equivalence within the 74HC4520 logic family. Selection between alternatives depends on supply availability, cost considerations, and specific application temperature requirements.

Frequently Asked Questions (FAQ)

Q: Can CD74HC4520M96 replace CD74HC4520MT in existing designs?

A: Yes. CD74HC4520M96 is a direct parametric equivalent with identical electrical specifications, package configuration, and pinout. Both parts are manufactured by Texas Instruments and comply with ROHS3 standards.

Q: What is the functional difference between the two Texas Instruments variants?

A: No functional difference exists. Both CD74HC4520MT and CD74HC4520M96 implement the same 74HC4520 binary counter architecture. The primary distinction is product status: CD74HC4520MT is Last Time Buy, while CD74HC4520M96 is Active.

Q: Is 74HC4520D,118 from NXP compatible with the original CD74HC4520MT?

A: Yes. The 74HC4520D,118 maintains full functional and pinout compatibility. All critical parameters—logic type, element count, bit width, reset mechanism, timing, trigger capability, and supply voltage—are identical. The narrower operating temperature range (-40°C to 125°C) may require evaluation for applications requiring -55°C operation.

Q: Does the higher count rate of 74HC4520D,118 (69 MHz vs. 35 MHz) affect compatibility?

A: No. Higher count rate capability does not compromise compatibility. The 74HC4520D,118 operates within all specified electrical parameters of the original part and presents no functional risk in existing circuit designs.

Q: Are all three parts available in the same 16-SOIC package?

A: Yes. All three parts use 16-SOIC (0.154", 3.90mm Width) surface mount packaging, ensuring identical PCB footprint and assembly compatibility.

Q: What compliance certifications apply to these substitute parts?

A: CD74HC4520MT and CD74HC4520M96 are ROHS3 compliant. Both parts are REACH Unaffected and classified under ECCN EAR99. RoHS compliance status for 74HC4520D,118 is not specified in available documentation.

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