74HCT42D,652 Equivalent & Substitute Parts

Part Overview

The 74HCT42D,652 is a 1 x 4:10 decoder logic integrated circuit manufactured by NXP Semiconductors in a 16-SOIC surface mount package. This component is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity. The decoder function remains critical in applications requiring address decoding and multiplexing operations, necessitating reliable substitute options that maintain electrical and mechanical compatibility.

Substiute Parts

74HCT42D,652

NXP SemiconductorsIn Stock: 99274HCT42D,652 Datasheet

Current PartRFQ

SN74HC42D

Texas InstrumentsIn Stock: 7009SN74HC42D Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74HCT42D,652 is determined by the following critical parameters:

Functional Equivalence: Decoder type with 1 x 4:10 circuit configuration and identical independent circuit count (1).

Package Compatibility: 16-SOIC surface mount package with matching 0.154" (3.90mm) width specification ensures PCB footprint compatibility without layout modifications.

Electrical Compatibility: Supply voltage range, output current ratings, and operating temperature range must support the application requirements of the original design.

Compliance & Certification: RoHS3 compliance and MSL rating must meet or exceed the original specification to ensure manufacturing and storage compatibility.

The SN74HC42D from Texas Instruments meets these substitution criteria as a functionally equivalent 1 x 4:10 decoder in an identical 16-SOIC package with compatible electrical characteristics and compliance certifications.

Parameter Comparison

Engineering Selection Recommendations

The SN74HC42D qualifies as a direct substitute for the 74HCT42D,652 based on functional equivalence, package compatibility, and compliance certifications. Both components are ROHS3 compliant with MSL rating of 1, meeting environmental and manufacturing standards.

The SN74HC42D operates across a wider supply voltage range (2V ~ 6V) compared to the 74HCT42D,652 (4.5V ~ 5.5V), providing greater design flexibility for applications operating at the specified 4.5V ~ 5.5V range. Output current ratings of the SN74HC42D (5.2mA) exceed those of the original part (4mA), ensuring adequate drive capability for connected logic circuits.

The operating temperature range of the SN74HC42D extends to -40°C ~ 85°C, which covers the lower end of the original specification (-40°C ~ 125°C). Applications requiring operation above 85°C must evaluate thermal requirements against the substitute part's maximum rating.

Both components share identical 16-SOIC packaging, eliminating PCB redesign requirements and enabling direct board-level substitution.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC42D replace the 74HCT42D,652 in existing designs?

A: Yes. Both components feature identical 1 x 4:10 decoder functionality, 16-SOIC package geometry, and compatible electrical characteristics within the specified operating range of 4.5V ~ 5.5V. No PCB modifications are required.

Q: What are the key differences between these parts?

A: The SN74HC42D operates across a wider supply voltage range (2V ~ 6V versus 4.5V ~ 5.5V) and provides higher output current (5.2mA versus 4mA). The operating temperature range of the SN74HC42D is -40°C ~ 85°C, compared to -40°C ~ 125°C for the original part. For applications within the 4.5V ~ 5.5V range and below 85°C, these differences do not impact compatibility.

Q: Are there package considerations for substitution?

A: Both parts use the 16-SOIC package with identical 0.154" (3.90mm) width specification. PCB footprints are directly compatible without layout modifications.

Q: Do both parts meet the same compliance standards?

A: Yes. Both the 74HCT42D,652 and SN74HC42D are ROHS3 compliant with MSL rating of 1 (Unlimited), meeting equivalent environmental and manufacturing standards.

Q: What should be verified before substitution in high-temperature applications?

A: Applications requiring operation above 85°C must confirm that the SN74HC42D's maximum operating temperature rating is acceptable for the intended use case, as it does not extend to the original part's 125°C maximum.