MM74HC393N Equivalent & Substitute Parts

Part Overview

The MM74HC393N is a binary counter IC manufactured by onsemi, featuring two independent 4-bit counters with negative edge triggering. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing production and maintenance applications. The 74HC393 series provides reliable counting functionality across industrial and commercial temperature ranges with standard TTL-compatible logic levels.

Substiute Parts

MM74HC393N

onsemiIn Stock: 2243MM74HC393N Datasheet

Current PartRFQ

SN74HC393N

Texas InstrumentsIn Stock: 3422SN74HC393N Datasheet

DirectRFQ

CD74HC393E

Harris CorporationIn Stock: 1613CD74HC393E Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MM74HC393N is determined by strict equivalence across the following critical parameters:

• Logic Type: Binary Counter (2 elements, 4 bits per element)
• Trigger Type: Negative Edge
• Reset: Asynchronous
• Voltage Supply Range: 2 V ~ 6 V
• Package / Case: 14-DIP (0.300", 7.62mm)
• Mounting Type: Through Hole

Parts meeting all these criteria are classified as direct substitutes. Variations in count rate, operating temperature range, or product status do not disqualify substitution eligibility when core functional and physical parameters align.

Parameter Comparison

Engineering Selection Recommendations

SN74HC393N (Texas Instruments) is the primary substitute for MM74HC393N. This part maintains active product status with ROHS3 compliance, ensuring long-term availability and regulatory alignment. The 36 MHz count rate remains suitable for applications within the original design specifications.

CD74HC393E (Harris Corporation) serves as an alternative substitute when SN74HC393N is unavailable. This part provides an extended operating temperature range (-55°C ~ 125°C) compared to the original specification, offering broader environmental compatibility. However, RoHS non-compliance status should be evaluated against project requirements.

Both substitutes maintain identical functional architecture, pin configuration, and electrical interface characteristics with the MM74HC393N, enabling direct replacement in 14-DIP through-hole applications.

Frequently Asked Questions (FAQ)

Q: Can SN74HC393N directly replace MM74HC393N in existing designs? A: Yes. Both parts share identical logic architecture, pin configuration, and electrical specifications across supply voltage and operating temperature ranges specified for the original design. Through-hole mounting compatibility is maintained.

Q: What is the significance of the count rate difference between MM74HC393N (50 MHz) and SN74HC393N (36 MHz)? A: Count rate represents maximum switching frequency. The SN74HC393N operates at 36 MHz, which is lower than the original 50 MHz specification. Designs operating below 36 MHz encounter no functional impact. Applications requiring operation above 36 MHz must be re-evaluated.

Q: Is CD74HC393E suitable for applications requiring RoHS compliance? A: No. CD74HC393E carries RoHS non-compliant status. Applications subject to RoHS requirements must use SN74HC393N, which is ROHS3 compliant.

Q: Does the extended temperature range of CD74HC393E (-55°C ~ 125°C) provide additional design flexibility? A: The extended range accommodates applications requiring operation beyond the original -40°C ~ 85°C specification. However, this advantage applies only to designs with temperature requirements exceeding the original specification.

Q: Are all three parts pin-compatible? A: Yes. MM74HC393N, SN74HC393N, and CD74HC393E share identical 14-DIP package configuration and pin assignments, enabling direct socket replacement without PCB modification.