MM74HC244N Equivalent & Substitute Parts

Part Overview

The MM74HC244N is a non-inverting buffer logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability in a 20-DIP package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity. The 74HC series buffer architecture remains widely available from multiple manufacturers, enabling direct functional replacement in applications requiring non-inverting buffering with 3-state output control.

Key Parameters

Parameter	Value
Logic Type	Buffer, Non-Inverting
Number of Elements	2
Number of Bits per Element	4
Output Type	3-State
Current - Output High, Low	7.8mA, 7.8mA
Voltage - Supply	2V ~ 6V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-DIP (0.300", 7.62mm)
Mounting Type	Through Hole

Substitute Part Grouping Explanation

Substitution for the MM74HC244N is determined by matching the following critical parameters: logic type (non-inverting buffer), element configuration (2 elements, 4 bits per element), output type (3-state), electrical characteristics (7.8mA output current, 2V-6V supply voltage), package format (20-DIP), and mounting method (through hole). All substitute parts listed maintain these core specifications, ensuring functional and mechanical compatibility. Differences in operating temperature range, product status, and manufacturer do not affect substitutability within the defined electrical and mechanical constraints.

Parameter Comparison

Part Number	Manufacturer	Product Status	Logic Type	Elements / Bits	Output Type	Current (mA)	Supply Voltage	Temp Range (°C)	Package
MM74HC244N	onsemi	Obsolete	Buffer, Non-Inverting	2 / 4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-DIP
SN74HC244N	Texas Instruments	Active	Buffer, Non-Inverting	2 / 4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-DIP
CD74HC244E	Texas Instruments	Active	Buffer, Non-Inverting	2 / 4	3-State	7.8 / 7.8	2V ~ 6V	-55 ~ 125	20-DIP
SN74HC241N	Texas Instruments	Active	Buffer, Non-Inverting	2 / 4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-DIP
SN74HC244AN	Texas Instruments	Active	Buffer, Non-Inverting	2 / 4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-DIP
SN74HC244NE4	Texas Instruments	Active	Buffer, Non-Inverting	2 / 4	3-State	7.8 / 7.8	2V ~ 6V	-40 ~ 85	20-DIP

Engineering Selection Recommendations

SN74HC244N from Texas Instruments serves as the primary direct substitute, offering identical electrical and thermal specifications with active product status and ROHS3 compliance. CD74HC244E provides an extended operating temperature range (-55°C to 125°C) suitable for applications requiring broader thermal performance, while maintaining all other core parameters. SN74HC244AN, SN74HC244NE4, and SN74HC241N are parametric equivalents with active status and full compliance certifications. All substitute parts are available in standard tube packaging and meet REACH and EAR99 export requirements consistent with the original MM74HC244N specification.

Frequently Asked Questions (FAQ)

Q: Can SN74HC244N directly replace MM74HC244N in existing designs? A: Yes. SN74HC244N matches all critical electrical parameters, output characteristics, supply voltage range, and 20-DIP package format. The primary difference is manufacturer (Texas Instruments vs. onsemi) and active product status versus obsolete status.

Q: What is the difference between SN74HC244N and CD74HC244E? A: Both are non-inverting buffers with identical logic configuration and output current ratings. CD74HC244E extends the operating temperature range to -55°C to 125°C, compared to -40°C to 85°C for SN74HC244N. Select CD74HC244E for applications requiring wider temperature performance.

Q: Are SN74HC241N and SN74HC244N interchangeable? A: Both parts share identical electrical specifications, output characteristics, and package format. The base product numbers differ (74HC241 vs. 74HC244), but both function as 2-element, 4-bit non-inverting buffers with 3-state output in 20-DIP packages.

Q: Does packaging affect substitutability? A: All listed substitutes use 20-DIP through-hole packaging with 0.300" (7.62mm) spacing, ensuring mechanical compatibility with existing PCB layouts and socket configurations.

Q: Are all substitutes RoHS and REACH compliant? A: All Texas Instruments substitutes (SN74HC244N, CD74HC244E, SN74HC241N, SN74HC244AN, SN74HC244NE4) are ROHS3 compliant and REACH unaffected. Compliance certifications match the original MM74HC244N specification.

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