74VHC393M Binary Counter IC Equivalent & Substitute Parts

Part Overview

The 74VHC393M is a dual 4-bit binary counter IC manufactured by onsemi, designed for negative edge-triggered counting applications. This component features asynchronous reset capability and operates across a wide supply voltage range of 2V to 5.5V. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

74VHC393M

onsemiIn Stock: 103474VHC393M Datasheet

Current PartRFQ

MC74VHC393DG

onsemiIn Stock: 1027MC74VHC393DG Datasheet

UpgradeRFQ

SN74LV393AD

Texas InstrumentsIn Stock: 1395SN74LV393AD Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74VHC393M is determined by the following critical parameters:

• Logic Function: Binary counter with 2 elements, 4 bits per element, up-counting direction
• Trigger Mechanism: Negative edge-triggered operation
• Reset Configuration: Asynchronous reset capability
• Supply Voltage Compatibility: 2V to 5.5V operating range
• Package Compatibility: 14-SOIC surface mount package with identical physical dimensions
• Pin Configuration: Identical pinout required for direct substitution

The identified substitute parts maintain these core functional and physical parameters, enabling direct replacement in existing circuit designs.

Parameter Comparison

Engineering Selection Recommendations

MC74VHC393DG (onsemi) is the primary upgrade path for the obsolete 74VHC393M. Both parts are manufactured by onsemi within the 74VHC series and maintain identical functional specifications and package geometry. The MC74VHC393DG offers extended operating temperature range (-55°C to 125°C versus -40°C to 85°C) and active product status, ensuring long-term availability and supply chain continuity. RoHS3 compliance is confirmed for the MC74VHC393DG.

SN74LV393AD (Texas Instruments) provides an alternative substitute with identical functional parameters and package compatibility. This part operates at a reduced count rate of 70 MHz compared to 115 MHz for the VHC series variants. The SN74LV393AD is discontinued at DiGi Electronics but maintains RoHS3 compliance. Selection of this alternative is appropriate only when the 70 MHz count rate specification is sufficient for the application requirements.

Both substitute parts maintain the critical parameters of dual 4-bit binary counter functionality, negative edge triggering, asynchronous reset, 2V to 5.5V supply voltage compatibility, and 14-SOIC package configuration required for direct substitution.

Frequently Asked Questions (FAQ)

Q: Can MC74VHC393DG directly replace 74VHC393M in existing designs?

A: Yes. Both parts share identical functional specifications, pinout, and 14-SOIC package dimensions. The MC74VHC393DG is the direct upgrade with active product status.

Q: What is the primary difference between MC74VHC393DG and SN74LV393AD?

A: The MC74VHC393DG operates at 115 MHz count rate, while the SN74LV393AD operates at 70 MHz. Both maintain identical counter functionality, trigger type, and package configuration. Selection depends on application frequency requirements.

Q: Are there temperature range considerations when substituting?

A: The MC74VHC393DG supports -55°C to 125°C operating temperature, exceeding the original 74VHC393M specification of -40°C to 85°C. The SN74LV393AD matches the original temperature range. Verify application requirements before selection.

Q: Is the 14-SOIC package identical across all three parts?

A: Yes. All three parts use 14-SOIC (0.154", 3.90mm Width) surface mount packaging with identical physical dimensions and pinout, enabling direct PCB replacement.

Q: What compliance certifications apply to substitute parts?

A: MC74VHC393DG is RoHS3 compliant. SN74LV393AD is RoHS3 compliant. Both parts maintain REACH Unaffected status and identical HTSUS classification (8542.39.0001).