74HCT390N,652 Equivalent & Substitute Parts

Part Overview

The 74HCT390N,652 is a decade counter logic IC manufactured by NXP USA Inc., featuring dual 4-bit negative edge-triggered counters in a 16-DIP package. This component is classified as obsolete, making identification of compatible substitute parts essential for ongoing system maintenance and new design implementations. The part operates within the 4.5V to 5.5V supply range and supports count rates up to 55 MHz with asynchronous reset functionality.

Substiute Parts

74HCT390N,652

NXP USA Inc.In Stock: 108874HCT390N,652 Datasheet

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CD74HCT390E

Texas InstrumentsIn Stock: 6363CD74HCT390E Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HCT390N,652 is determined by strict equivalence across the following critical parameters:

• Logic Type: Counter, Decade (2 Element, 4 Bit configuration)
• Trigger Type: Negative Edge
• Reset Function: Asynchronous
• Voltage Supply Range: 4.5 V ~ 5.5 V
• Package / Case: 16-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole
• Base Product Number: 74HCT390

The CD74HCT390E from Texas Instruments satisfies all mandatory substitution criteria. While the CD74HCT390E exhibits a lower maximum count rate (27 MHz versus 55 MHz) and an extended lower operating temperature limit (-55°C versus -40°C), these represent performance enhancements or equivalent specifications that do not restrict substitution in applications designed for the original part.

Parameter Comparison

Engineering Selection Recommendations

The CD74HCT390E is a direct functional substitute for the 74HCT390N,652. Both parts comply with ROHS3 standards and maintain identical electrical interfaces and pinout configurations. The CD74HCT390E carries an Active product status, ensuring continued availability and supply chain stability compared to the Obsolete status of the original NXP part. The Texas Instruments device provides extended lower temperature operation (-55°C minimum) and maintains full compatibility with the 16-DIP through-hole package specification. Selection of the CD74HCT390E eliminates obsolescence risk while preserving functional equivalence for decade counter applications requiring negative edge triggering and asynchronous reset.

Frequently Asked Questions (FAQ)

Q: Can the CD74HCT390E directly replace the 74HCT390N,652 in existing designs?

A: Yes. Both parts share identical logic type, element configuration, trigger characteristics, supply voltage range, and 16-DIP package footprint. Pin-for-pin compatibility is maintained.

Q: What is the significance of the different count rate specifications (55 MHz vs. 27 MHz)?

A: The 74HCT390N,652 specifies a maximum count rate of 55 MHz, while the CD74HCT390E specifies 27 MHz. Applications operating below 27 MHz encounter no functional limitation. Applications requiring operation between 27 MHz and 55 MHz must verify that the CD74HCT390E meets system timing requirements.

Q: Does the extended operating temperature range of the CD74HCT390E affect compatibility?

A: No. The CD74HCT390E operating range of -55°C to 125°C encompasses the 74HCT390N,652 range of -40°C to 125°C. Extended lower temperature capability does not restrict substitution.

Q: Are both parts RoHS compliant?

A: Yes. Both the 74HCT390N,652 and CD74HCT390E are ROHS3 compliant, meeting environmental and regulatory requirements for electronic component manufacturing.

Q: What packaging considerations apply to this substitution?

A: Both parts use identical 16-DIP (0.300", 7.62mm) through-hole packaging. PCB footprints, mounting procedures, and mechanical integration remain unchanged.