74HC393N,652 Binary Counter IC Equivalent & Substitute Parts

Part Overview

The 74HC393N,652 is a dual 4-bit binary counter IC manufactured by NXP USA Inc., designed for digital logic applications requiring asynchronous reset and negative edge triggering. This component features two independent 4-bit counters in a 14-DIP package with a maximum count rate of 107 MHz and operates across a supply voltage range of 2 V to 6 V.

The 74HC393N,652 is classified as obsolete. Locating equivalent substitute parts is necessary to maintain design continuity, ensure component availability, and support ongoing production or repair requirements for legacy systems utilizing this counter IC.

Substiute Parts

74HC393N,652

NXP USA Inc.In Stock: 107974HC393N,652 Datasheet

Current PartRFQ

CD74HC393E

Harris CorporationIn Stock: 1613CD74HC393E Datasheet

MFR RecommendedRFQ

SN74HC393N

Texas InstrumentsIn Stock: 3422SN74HC393N Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the 74HC393N,652 are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Core Functional Parameters:

• Logic Type: Binary Counter
• Number of Elements: 2
• Number of Bits per Element: 4
• Direction: Up
• Reset: Asynchronous
• Trigger Type: Negative Edge
• Package / Case: 14-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole

Electrical Compatibility Parameters:

• Voltage - Supply: 2 V ~ 6 V (minimum requirement)
• Operating Temperature Range: Must encompass or overlap with -40°C ~ 125°C

Substitute parts must maintain identical functional architecture (dual 4-bit up counters with asynchronous reset and negative edge triggering) and physical form factor (14-DIP through-hole package). Variations in count rate, temperature range, and compliance certifications are permissible provided the substitute meets or exceeds the electrical operating envelope of the original part.

Parameter Comparison

Engineering Selection Recommendations

SN74HC393N (Texas Instruments) is the primary substitute for the 74HC393N,652. This part maintains full functional equivalence with identical counter architecture, supply voltage range, and package form factor. The SN74HC393N carries Active product status, ensuring ongoing availability and supply chain support. It is ROHS3 compliant, meeting current environmental and regulatory requirements. The operating temperature range of -40°C to 85°C covers the lower portion of the original specification; applications requiring operation above 85°C should be evaluated against actual system thermal requirements.

CD74HC393E (Harris Corporation) provides functional equivalence but carries two significant constraints. First, it is classified as RoHS non-compliant, which may conflict with procurement policies or regulatory requirements in certain markets. Second, its product status is Obsolete, presenting potential long-term availability concerns. The operating temperature range extends to -55°C, providing enhanced low-temperature performance. This substitute is suitable only when RoHS compliance is not mandated and when long-term supply availability is not critical.

For new designs or applications requiring regulatory compliance and supply continuity, SN74HC393N is the recommended substitute. For legacy system maintenance where RoHS compliance is not required, either substitute provides functional compatibility.

Frequently Asked Questions (FAQ)

Q: Can the SN74HC393N directly replace the 74HC393N,652 in existing circuit boards?

A: Yes. Both parts share identical pin configurations, functional behavior (dual 4-bit asynchronous up counters with negative edge triggering), and 14-DIP through-hole package dimensions. No circuit modifications are required for direct substitution.

Q: What is the significance of the count rate difference between the 74HC393N,652 (107 MHz) and the substitute parts (35-36 MHz)?

A: The count rate specifies the maximum frequency at which the counter can reliably toggle its output. The 74HC393N,652 supports higher frequency operation. However, in most digital logic applications, the actual clock frequencies applied to the counter are significantly lower than the maximum rated count rate. Substitutes are compatible provided the application clock frequency does not exceed 35-36 MHz. Applications operating at frequencies above 36 MHz require evaluation against actual system requirements.

Q: Why is the SN74HC393N recommended over the CD74HC393E?

A: The SN74HC393N carries Active product status, ensuring continued manufacturing and availability. It is ROHS3 compliant, meeting modern environmental standards. The CD74HC393E is Obsolete and RoHS non-compliant, presenting supply chain and regulatory risks. The SN74HC393N is the preferred choice for applications where compliance and long-term availability are priorities.

Q: Does the operating temperature range difference affect substitution suitability?

A: The SN74HC393N operates from -40°C to 85°C, while the original part operates to 125°C. For applications requiring operation above 85°C, the SN74HC393N may not be suitable. Verify actual system operating temperatures against the substitute's temperature specification. The CD74HC393E extends to 125°C but carries obsolescence and compliance concerns.

Q: Are there any package or pinout differences between these parts?

A: No. All three parts use the 14-DIP (0.300", 7.62mm) through-hole package with identical pinouts. Physical board layout and socket compatibility are maintained across all substitutes.

Q: What does ROHS3 compliance mean for component selection?

A: ROHS3 compliance indicates the part meets the Restriction of Hazardous Substances Directive, restricting lead, cadmium, mercury, and other hazardous materials. This certification is required for many commercial and industrial applications, particularly in regulated markets. The SN74HC393N meets this requirement; the CD74HC393E does not.