74HCT4040D,652 Equivalent & Substitute Parts

Part Overview

The 74HCT4040D,652 is a 12-bit binary counter logic IC manufactured by Nexperia USA Inc. in a 16-SOIC surface mount package. This device functions as a single-element counter with asynchronous reset and negative edge triggering, operating at a maximum count rate of 79 MHz. The part is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Substiute Parts

74HCT4040D,652

Nexperia USA Inc.In Stock: 98074HCT4040D,652 Datasheet

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CD74HCT4040M

Harris CorporationIn Stock: 3502CD74HCT4040M Datasheet

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CD74HCT4040M96

Texas InstrumentsIn Stock: 1789CD74HCT4040M96 Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74HCT4040D,652 is determined by strict equivalence in the following parameters:

• Logic Type: Binary Counter
• Number of Bits per Element: 12
• Number of Elements: 1
• Direction: Up
• Reset Type: Asynchronous
• Trigger Type: Negative Edge
• Voltage Supply Range: 4.5 V ~ 5.5 V
• Package / Case: 16-SOIC (0.154", 3.90mm Width)
• Mounting Type: Surface Mount

The identified substitute parts CD74HCT4040M and CD74HCT4040M96 meet all these core functional and mechanical requirements. Variations in count rate, operating temperature range, product status, and compliance certifications are secondary considerations that do not affect functional substitutability within the specified electrical parameters.

Parameter Comparison

Engineering Selection Recommendations

CD74HCT4040M96 is the preferred substitute for new designs and long-term procurement. This part is manufactured by Texas Instruments with Active product status, ensuring ongoing availability and support. It carries ROHS3 compliance and REACH unaffected certification, meeting current environmental and regulatory requirements. The extended operating temperature range of -55°C ~ 125°C provides additional margin for demanding applications.

CD74HCT4040M, manufactured by Harris Corporation, is functionally equivalent but carries Obsolete product status and RoHS non-compliance. This part is suitable only for legacy system maintenance where regulatory compliance is not a requirement and long-term availability cannot be assured.

Both substitutes operate at 25 MHz count rate, which is lower than the main part's 79 MHz specification. Applications requiring the higher count rate of the original 74HCT4040D,652 must evaluate whether this reduction is acceptable for the intended circuit function.

Frequently Asked Questions (FAQ)

Q: Can CD74HCT4040M and CD74HCT4040M96 be used interchangeably with 74HCT4040D,652?

A: Both substitutes are functionally equivalent within the specified electrical parameters: 12-bit binary counter, asynchronous reset, negative edge triggering, 4.5 V ~ 5.5 V supply, and 16-SOIC package. Pin configuration and logic function are identical. The primary difference is count rate: substitutes operate at 25 MHz versus the original 79 MHz.

Q: What is the impact of the lower count rate in the substitute parts?

A: The CD74HCT4040M and CD74HCT4040M96 operate at 25 MHz maximum count rate compared to 79 MHz for the 74HCT4040D,652. This affects the maximum frequency at which the counter can reliably toggle. Applications operating below 25 MHz are unaffected. Applications requiring operation above 25 MHz must evaluate alternative parts or circuit design modifications.

Q: Are there packaging differences between the main part and substitutes?

A: All three parts use the 16-SOIC (0.154", 3.90mm Width) surface mount package with identical pin configuration. The 74HCT4040D,652 is supplied in Tube packaging, while CD74HCT4040M is also supplied in Tube, and CD74HCT4040M96 is supplied in Tape & Reel (TR). These packaging differences affect procurement and handling but not electrical or mechanical compatibility.

Q: Which substitute should be selected for new designs?

A: CD74HCT4040M96 is recommended for new designs. It is manufactured by Texas Instruments with Active product status, ensuring long-term availability. It meets ROHS3 compliance and REACH requirements, satisfying current environmental regulations. The extended operating temperature range of -55°C ~ 125°C provides additional design margin.

Q: Can CD74HCT4040M be used if CD74HCT4040M96 is unavailable?

A: CD74HCT4040M is functionally equivalent but carries Obsolete product status and RoHS non-compliance. It is suitable only for legacy system maintenance where regulatory compliance is not required and where the risk of future unavailability is acceptable.

Q: Are the operating temperature ranges compatible?

A: The 74HCT4040D,652 operates from -40°C ~ 125°C. Both substitutes operate from -55°C ~ 125°C, providing a wider lower temperature range. Applications operating within -40°C ~ 125°C are fully compatible. Applications requiring operation below -40°C benefit from the extended range of the substitutes.