CD74HCT393ME4 Equivalent & Substitute Parts

Part Overview

The CD74HCT393ME4 is a binary counter IC manufactured by Texas Instruments, featuring two independent 4-bit counters with negative edge triggering. This component is classified as a logic IC and is packaged in a 14-SOIC surface mount configuration. The part is currently discontinued at DiGi Electronics, necessitating identification of functionally equivalent alternatives that maintain electrical and mechanical compatibility for ongoing production and repair applications.

Substiute Parts

CD74HCT393ME4

Texas InstrumentsIn Stock: 869CD74HCT393ME4 Datasheet

Current PartRFQ

CD74HCT393M

Harris CorporationIn Stock: 5917CD74HCT393M Datasheet

MFR RecommendedRFQ

74HCT393D,653

Nexperia USA Inc.In Stock: 259574HCT393D,653 Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the CD74HCT393ME4 is determined by strict equivalence across the following critical parameters:

• Logic Function: Binary counter with 2 elements, 4 bits per element, up-counting direction, negative edge trigger
• Electrical Specifications: Supply voltage range 4.5 V ~ 5.5 V, operating temperature range, count rate capability
• Package Compatibility: 14-SOIC surface mount package with identical pin configuration
• Reset Mechanism: Asynchronous reset functionality
• Compliance Requirements: RoHS3 compliance status for regulatory alignment

The identified substitute parts maintain functional equivalence across these parameters while differing in manufacturer origin, product status, and specific performance characteristics such as maximum count rate.

Parameter Comparison

Engineering Selection Recommendations

CD74HCT393M (Harris Corporation): This substitute maintains full electrical and functional equivalence to the CD74HCT393ME4. However, the part is classified as obsolete and carries RoHS non-compliant status. Selection of this alternative is appropriate only for legacy system maintenance where RoHS compliance is not a regulatory requirement and long-term availability cannot be assured.

74HCT393D,653 (Nexperia USA Inc.): This substitute is the preferred alternative for new designs and ongoing production. The part maintains functional equivalence across all critical parameters, including binary counter logic, element count, bit width, trigger mechanism, and supply voltage specifications. The 74HCT393D,653 is currently active in production, ROHS3 compliant, and offers superior count rate performance at 107 MHz compared to the original 27 MHz specification. The operating temperature range is narrower (-40°C ~ 125°C versus -55°C ~ 125°C), which must be evaluated against specific application requirements. Packaging is supplied in Tape & Reel format, suitable for automated assembly processes.

Frequently Asked Questions (FAQ)

Q: Can the CD74HCT393M be used as a direct replacement for the CD74HCT393ME4?

A: The CD74HCT393M provides functional equivalence in logic operation, electrical specifications, and package configuration. However, the part is obsolete and RoHS non-compliant. Use is limited to legacy applications where these factors do not present constraints.

Q: Is the 74HCT393D,653 a pin-for-pin compatible substitute?

A: Yes. The 74HCT393D,653 maintains identical pin configuration within the 14-SOIC package and is functionally equivalent across all critical counter specifications.

Q: What is the significance of the higher count rate in the 74HCT393D,653?

A: The 74HCT393D,653 specifies a maximum count rate of 107 MHz compared to 27 MHz in the original part. This represents improved performance capability and does not create incompatibility; circuits designed for 27 MHz operation will function correctly with the higher-rated substitute.

Q: Does the narrower operating temperature range of the 74HCT393D,653 affect compatibility?

A: The 74HCT393D,653 operates from -40°C to 125°C, compared to -55°C to 125°C for the CD74HCT393ME4. Applications requiring operation below -40°C must retain the original specification or evaluate alternative solutions.

Q: What packaging formats are available for substitute parts?

A: The CD74HCT393M is supplied in Tube packaging. The 74HCT393D,653 is supplied in Tape & Reel format, optimized for automated assembly. Both maintain the 14-SOIC surface mount package configuration.

Q: Are both substitute parts RoHS compliant?

A: The 74HCT393D,653 is ROHS3 compliant. The CD74HCT393M is RoHS non-compliant. For applications subject to RoHS regulatory requirements, the 74HCT393D,653 is the appropriate selection.