MM74C244N Equivalent & Substitute Parts

Part Overview

The MM74C244N is a non-inverting buffer IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This device operates across a wide supply voltage range of 3V to 15V and is housed in a 20-PDIP package. The MM74C244N is classified as obsolete, making identification of suitable substitute components essential for ongoing system support and new design implementations.

Substiute Parts

MM74C244N

onsemiIn Stock: 8954MM74C244N Datasheet

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CD74HC244E

Texas InstrumentsIn Stock: 2814CD74HC244E Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the MM74C244N is determined by strict functional and electrical compatibility criteria. The following parameters must remain consistent across substitute components:

• Logic configuration: 2-element, 4-bit non-inverting buffer with 3-state output
• Package form factor: 20-DIP (0.300", 7.62mm) for direct pin-compatible replacement
• Operating temperature range: -55°C to 125°C (TA)
• Mounting technology: Through-hole configuration

The CD74HC244E from Texas Instruments satisfies these core requirements. While the CD74HC244E operates at a reduced supply voltage range (2V ~ 6V) compared to the MM74C244N (3V ~ 15V), it maintains functional equivalence within its specified operating envelope. Output current specifications differ (7.8mA versus 70mA), reflecting the different technology families (HC versus C-series CMOS).

Parameter Comparison

Engineering Selection Recommendations

The CD74HC244E is the designated substitute for the MM74C244N based on functional equivalence and active product status. The CD74HC244E is ROHS3 compliant and maintains REACH unaffected classification, aligning with current regulatory requirements. Both components share identical pin configurations and logic functionality, enabling direct socket replacement in through-hole applications.

Selection of the CD74HC244E is appropriate for applications where the reduced supply voltage range (2V ~ 6V) and lower output current (7.8mA) are compatible with system requirements. Applications requiring the full 3V to 15V supply voltage range or 70mA output current capability of the original MM74C244N must evaluate alternative buffer solutions outside this substitution group.

Frequently Asked Questions (FAQ)

Q: Can the CD74HC244E directly replace the MM74C244N in existing designs?

A: Pin-for-pin replacement is possible due to identical 20-DIP package configuration and matching logic functionality. However, verify that system supply voltage operates within the CD74HC244E range of 2V to 6V and that output current requirements do not exceed 7.8mA per output.

Q: What are the key differences between the MM74C244N and CD74HC244E?

A: The primary differences are supply voltage range (MM74C244N: 3V ~ 15V; CD74HC244E: 2V ~ 6V) and output current capability (MM74C244N: 70mA; CD74HC244E: 7.8mA). Both devices maintain identical logic configuration, pin count, and operating temperature range.

Q: Why is the MM74C244N classified as obsolete?

A: The MM74C244N represents legacy 74C-series CMOS technology. Modern designs utilize 74HC and 74HCT series alternatives, which offer improved performance characteristics and active manufacturing support.

Q: Are there compliance differences between these components?

A: The CD74HC244E is ROHS3 compliant, while the MM74C244N compliance status reflects its obsolete classification. Both maintain REACH unaffected status and EAR99 export classification.

Q: What packaging options are available for the CD74HC244E?

A: The CD74HC244E is supplied in tube packaging. The 20-PDIP package maintains compatibility with through-hole PCB designs requiring the MM74C244N form factor.