74HC93DB,112 Binary Counter IC - Equivalent & Substitute Parts

Part Overview

The 74HC93DB,112 is a 4-bit binary counter IC manufactured by NXP USA Inc., designed for digital logic applications requiring asynchronous reset and negative edge triggering. This component is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and procurement planning. The part operates across a wide supply voltage range of 2V to 6V and supports count rates up to 108 MHz, making it suitable for general-purpose counting and frequency division applications in legacy and new designs.

Substiute Parts

74HC93DB,112

NXP USA Inc.In Stock: 83974HC93DB,112 Datasheet

Current PartRFQ

CD74HC93M

Harris CorporationIn Stock: 1801CD74HC93M Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74HC93DB,112 is determined by the following core electrical and mechanical parameters:

Functional Equivalence Criteria:

• Logic type: Binary counter
• Number of bits per element: 4 bits
• Number of elements: 1
• Direction: Up counter
• Reset mechanism: Asynchronous
• Trigger type: Negative edge
• Supply voltage range: 2V ~ 6V (minimum overlap required)
• Mounting type: Surface mount

Package Compatibility:

• The 74HC93DB,112 uses 14-SSOP packaging. Substitute parts may use alternative 14-pin surface mount packages (such as 14-SOIC) provided pin configuration and electrical characteristics remain compatible with the base product number 74HC93.

The CD74HC93M qualifies as a manufacturer-recommended substitute based on identical functional specifications within the 74HC93 series, despite differences in count rate maximum and operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

RoHS Compliance Consideration: The 74HC93DB,112 carries RoHS3 compliance certification. The CD74HC93M is marked as RoHS non-compliant. Selection between these parts must account for end-product regulatory requirements and supply chain restrictions in regions where RoHS compliance is mandatory.

Count Rate Derating: The CD74HC93M specifies a maximum count rate of 35 MHz compared to 108 MHz for the 74HC93DB,112. Applications requiring operation at frequencies above 35 MHz cannot use the CD74HC93M as a direct substitute without performance degradation.

Temperature Range: The CD74HC93M supports an extended lower operating temperature limit of -55°C versus -40°C for the 74HC93DB,112. This provides additional margin for applications requiring operation in extreme cold environments.

Package Transition: Migration from 14-SSOP to 14-SOIC packaging requires PCB layout modification. Both packages maintain 14-pin surface mount configuration with compatible pin assignments within the 74HC93 series.

Frequently Asked Questions (FAQ)

Q: Can the CD74HC93M replace the 74HC93DB,112 in all applications? A: The CD74HC93M is functionally equivalent for applications operating at count rates up to 35 MHz. Applications requiring count rates between 35 MHz and 108 MHz cannot use this substitute without performance loss. RoHS compliance requirements must also be evaluated.

Q: What is the difference between 14-SSOP and 14-SOIC packaging? A: Both are 14-pin surface mount packages with different physical dimensions. The 14-SSOP (0.209" width) is narrower than the 14-SOIC (0.154" width). PCB footprints are not interchangeable and require separate design layouts.

Q: Are the supply voltage ranges identical? A: Both parts operate across 2V to 6V supply voltage range, ensuring compatibility in this critical parameter.

Q: Why is the CD74HC93M listed as RoHS non-compliant? A: The CD74HC93M was manufactured by Harris Corporation under older production standards. The 74HC93DB,112 from NXP represents a newer RoHS3-compliant version of the same functional device.

Q: What does "asynchronous reset" mean for counter operation? A: Asynchronous reset allows the counter to be cleared independent of the clock signal, enabling immediate reset without waiting for the next clock edge.

Q: Can I use the CD74HC93M in a new design? A: Yes, provided the application meets all specified parameter limits (35 MHz maximum count rate, RoHS non-compliance acceptance, and packaging requirements). The 74HC93 series remains functionally stable despite obsolete status.