MC74VHC393DG Equivalent & Substitute Parts

Part Overview

The MC74VHC393DG is a 4-bit binary counter IC manufactured by onsemi, designed for digital logic applications requiring counting functionality. This device integrates two independent 4-bit binary counters with asynchronous reset capability in a 14-SOIC surface mount package. The part is currently active in production with 958 units in stock.

Substitute parts become necessary when the primary part is unavailable, discontinued, or when design requirements allow for alternative manufacturers meeting identical or compatible electrical and mechanical specifications.

Substiute Parts

MC74VHC393DG

onsemiIn Stock: 1027MC74VHC393DG Datasheet

Current PartRFQ

SN74LV393AD

Texas InstrumentsIn Stock: 1395SN74LV393AD Datasheet

DirectRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MC74VHC393DG is determined by the following critical parameters:

• Logic Configuration: Binary counter with 2 elements, 4 bits per element, up-counting direction, negative edge trigger, and asynchronous reset
• Package Compatibility: 14-SOIC surface mount package with identical physical dimensions
• Electrical Specifications: Supply voltage range 2 V ~ 5.5 V, operating temperature range, and count rate performance
• Compliance: ROHS3 compliance and REACH unaffected status

The SN74LV393AD from Texas Instruments meets these substitution criteria, maintaining identical logic configuration, package form factor, and supply voltage specifications.

Parameter Comparison

Engineering Selection Recommendations

The MC74VHC393DG remains the preferred selection for new designs due to its active production status and extended operating temperature range (-55°C ~ 125°C). The device provides higher count rate performance at 115 MHz.

The SN74LV393AD serves as a functional substitute where the MC74VHC393DG is unavailable. Both devices share identical logic configuration, package form factor, and supply voltage specifications. The SN74LV393AD operates within a narrower temperature range (-40°C ~ 85°C) and supports a maximum count rate of 70 MHz. Selection of the substitute should account for application-specific temperature and frequency requirements.

Both parts maintain ROHS3 compliance and REACH unaffected status, ensuring regulatory compatibility.

Frequently Asked Questions (FAQ)

Q: Can the SN74LV393AD directly replace the MC74VHC393DG in existing designs?

A: Direct pin-compatible replacement is possible when application operating temperature remains within -40°C ~ 85°C and count rate requirements do not exceed 70 MHz. The 14-SOIC package dimensions are identical, and all logic functions are equivalent.

Q: What are the key differences between these parts?

A: The primary differences are count rate performance (115 MHz vs. 70 MHz) and operating temperature range (-55°C ~ 125°C vs. -40°C ~ 85°C). Both parts share identical supply voltage specifications, logic configuration, and package form factor.

Q: Are both parts RoHS compliant?

A: Yes, both the MC74VHC393DG and SN74LV393AD are ROHS3 compliant and REACH unaffected.

Q: What is the significance of the 14-SOIC package specification?

A: The 14-SOIC package ensures mechanical and electrical compatibility between the main part and substitute. Both devices use identical surface mount package dimensions (0.154" width, 3.90mm), allowing direct PCB footprint compatibility.

Q: Why is the MC74VHC393DG preferred over the SN74LV393AD?

A: The MC74VHC393DG maintains active production status and offers extended operating temperature range and higher count rate performance, making it suitable for a broader range of applications.