MM74HC4040N Equivalent & Substitute Parts

Part Overview

The MM74HC4040N is a 12-bit binary counter logic IC manufactured by onsemi, housed in a 16-DIP package. This component functions as a negative-edge-triggered counter with asynchronous reset capability, operating across a 2V to 6V supply range. The part is currently classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

MM74HC4040N

onsemiIn Stock: 3622MM74HC4040N Datasheet

Current PartRFQ

CD74HC4040E

Texas InstrumentsIn Stock: 1624CD74HC4040E Datasheet

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SN74HC4040N

Texas InstrumentsIn Stock: 2441SN74HC4040N Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the MM74HC4040N is determined by strict alignment with the following core parameters: 12-bit binary counter configuration, single element, upward counting direction, negative-edge trigger, asynchronous reset, 16-DIP through-hole package, and 2V to 6V supply voltage compatibility. All identified substitutes maintain these electrical and mechanical specifications, ensuring direct functional equivalence at the circuit level. Variations in count rate, operating temperature range, and product status are noted but do not preclude substitution where the application requirements fall within the substitute's specified limits.

Parameter Comparison

Engineering Selection Recommendations

Both SN74HC4040N and CD74HC4040E from Texas Instruments serve as direct functional substitutes for the obsolete MM74HC4040N. The SN74HC4040N maintains identical operating temperature specifications (-40°C to 85°C) and is classified as active product status, providing long-term availability assurance. The CD74HC4040E extends the operating temperature range to -55°C to 125°C and carries RoHS3 compliance certification, making it suitable for applications requiring enhanced environmental performance or regulatory compliance. Count rate differences (33 MHz for SN74HC4040N and 35 MHz for CD74HC4040E versus 50 MHz for the original MM74HC4040N) must be evaluated against specific application timing requirements. Selection between these substitutes should prioritize active product status and compliance certifications aligned with end-use requirements.

Frequently Asked Questions (FAQ)

Q: Can SN74HC4040N and CD74HC4040E be used interchangeably with MM74HC4040N?

A: Both parts are functionally equivalent at the circuit level, sharing identical counter configuration, trigger characteristics, reset behavior, package form factor, and supply voltage specifications. Substitution is valid provided application timing requirements do not exceed the substitute's maximum count rate specification.

Q: What is the significance of the count rate difference between the original and substitute parts?

A: Count rate represents the maximum frequency at which the counter can reliably operate. The MM74HC4040N specifies 50 MHz, while substitutes specify 33 MHz (SN74HC4040N) and 35 MHz (CD74HC4040E). Applications operating below these substitute thresholds experience no functional impact. Applications requiring operation above 35 MHz may require design review.

Q: Are there compliance or certification differences between the substitutes?

A: The CD74HC4040E carries RoHS3 compliance certification, while the SN74HC4040N does not specify RoHS status in the provided data. Both parts maintain REACH Unaffected status and EAR99 export classification. Applications subject to RoHS regulatory requirements should specify CD74HC4040E.

Q: Does the extended temperature range of CD74HC4040E affect substitution suitability?

A: The CD74HC4040E operating range (-55°C to 125°C) encompasses the MM74HC4040N range (-40°C to 85°C). Extended temperature capability does not compromise substitution validity and may provide additional design margin for temperature-sensitive applications.

Q: Are there packaging or mounting differences between these parts?

A: All three parts utilize identical 16-DIP through-hole packaging with 0.300" (7.62mm) pitch. No PCB layout or assembly process modifications are required for substitution.