MM74C244WM Equivalent & Substitute Parts

Part Overview

The MM74C244WM is a non-inverting buffer IC from onsemi's 74C logic series, designed for 2-element, 4-bit per element configurations with 3-state output capability. This component operates across a wide voltage supply range of 3V to 15V and supports operating temperatures from -55°C to 125°C. The part is classified as obsolete, making equivalent substitutes necessary for new designs and ongoing production requirements.

Substiute Parts

MM74C244WM

onsemiIn Stock: 809MM74C244WM Datasheet

Current PartRFQ

MM74HC244WMX

Fairchild SemiconductorIn Stock: 2295MM74HC244WMX Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the MM74C244WM is determined by the following critical parameters:

• Logic Function: Buffer, Non-Inverting with identical element and bit configuration (2 elements, 4 bits per element)
• Output Configuration: 3-State output capability
• Package Compatibility: 20-SOIC form factor with matching pin count and physical dimensions
• Electrical Interface: Compatible voltage supply and output current ratings within application requirements

The MM74HC244WMX qualifies as a functional substitute based on matching logic type, element configuration, output type, and package specification. However, differences in voltage supply range, output current ratings, and operating temperature must be evaluated against specific application requirements.

Parameter Comparison

Engineering Selection Recommendations

The MM74HC244WMX serves as an active substitute for the obsolete MM74C244WM when application requirements align with the following conditions:

• System voltage supply operates within the 2V to 6V range
• Operating temperature requirements fall within -40°C to 85°C
• Output current requirements do not exceed 7.8mA per output
• Pin-compatible 20-SOIC package is acceptable

Applications requiring the full voltage range (3V to 15V) or extended temperature operation (-55°C to 125°C) of the original MM74C244WM may require alternative solutions outside the provided substitute list. The MM74HC244WMX is classified as active product status, ensuring continued availability and manufacturing support.

Frequently Asked Questions (FAQ)

Q: Can the MM74HC244WMX directly replace the MM74C244WM in all applications?

A: Direct replacement is possible only when application voltage supply and temperature requirements fall within the MM74HC244WMX specifications (2V to 6V supply, -40°C to 85°C operating temperature). Applications requiring the full 3V to 15V supply range or extended temperature operation require evaluation of alternative parts.

Q: What are the key differences between the 74C and 74HC series?

A: The 74C series operates across a wider voltage range (3V to 15V) with higher output current capability (70mA), while the 74HC series operates at lower voltages (2V to 6V) with reduced output current (7.8mA). Both series provide identical logic functionality and 3-state output configuration in the same 20-SOIC package.

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

A: Both the MM74C244WM and MM74HC244WMX use the 20-SOIC package with identical physical dimensions (0.295", 7.50mm width) and pin configuration, enabling direct socket compatibility.

Q: Why is the MM74C244WM classified as obsolete?

A: The MM74C244WM is obsolete due to market transition toward the 74HC series, which provides improved performance characteristics and lower power consumption while maintaining functional equivalence for most applications.

Q: What should be considered when selecting between these parts?

A: Selection should be based on system voltage supply range, operating temperature requirements, and output current demands. Verify that the substitute part's electrical specifications meet or exceed application requirements before implementation.