DM7442AN Equivalent & Substitute Parts

Part Overview

The DM7442AN is a 4 x 1:2 decoder logic integrated circuit manufactured by onsemi in the 7400 series. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing system maintenance and new design implementations. The decoder function processes four independent 1:2 decoding circuits with single supply voltage operation, suitable for applications requiring logic-level signal routing and selection.

Substiute Parts

DM7442AN

onsemiIn Stock: 2255DM7442AN Datasheet

Current PartRFQ

CD74HCT42E

Texas InstrumentsIn Stock: 1489CD74HCT42E Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the DM7442AN is determined by the following critical parameters:

• Package Compatibility: Both parts must use 16-DIP (0.300", 7.62mm) through-hole packaging to ensure direct board-level replacement without layout modifications.
• Functional Category: Both must be logic decoder devices capable of signal routing and selection operations.
• Supply Voltage Range: The substitute must operate within or encompass the 4.75V ~ 5.25V supply range of the original part.
• Mounting Type: Through-hole mounting is required for compatibility with existing PCB designs.

The CD74HCT42E qualifies as a substitute based on matching package type, through-hole mounting, decoder functionality, and compatible supply voltage operation within the specified range.

Parameter Comparison

Engineering Selection Recommendations

The CD74HCT42E is available as an active product from Texas Instruments, providing supply chain continuity for applications currently using the obsolete DM7442AN. Both components share identical package geometry and through-hole mounting specifications, enabling direct PCB-level substitution.

The CD74HCT42E operates within an expanded supply voltage range (4.5V ~ 5.5V) that encompasses the DM7442AN specification (4.75V ~ 5.25V), ensuring compatibility across the original operating envelope. The extended operating temperature range (-55°C ~ 125°C) of the CD74HCT42E provides broader environmental capability compared to the DM7442AN (0°C ~ 70°C).

Both components maintain identical REACH and ECCN compliance status, supporting regulatory requirements for component selection. The active product status of the CD74HCT42E ensures long-term availability and technical support for new designs and legacy system maintenance.

Frequently Asked Questions (FAQ)

Q: Can the CD74HCT42E directly replace the DM7442AN on existing PCBs?

A: Yes. Both components use identical 16-DIP (0.300", 7.62mm) through-hole packaging, enabling direct pin-for-pin substitution without PCB layout modifications.

Q: Are there voltage supply compatibility concerns?

A: No. The CD74HCT42E supply voltage range (4.5V ~ 5.5V) fully encompasses the DM7442AN specification (4.75V ~ 5.25V). Operation within the original supply range is supported.

Q: What are the differences in output current specifications?

A: The DM7442AN specifies 800µA output high and 16mA output low current. The CD74HCT42E specifies 4mA for both output high and low conditions. System designs must verify that load requirements are compatible with the CD74HCT42E output current capability.

Q: Does the CD74HCT42E support the full operating temperature range of the DM7442AN?

A: Yes. The CD74HCT42E operating range (-55°C ~ 125°C) exceeds the DM7442AN range (0°C ~ 70°C), providing full coverage of the original specification.

Q: Are regulatory compliance requirements met?

A: Both components maintain identical REACH Unaffected and EAR99 ECCN status, satisfying regulatory requirements for component substitution.