74VHC244MX Equivalent & Substitute Parts

Part Overview

The 74VHC244MX 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-SOIC package. This component operates across a 2V to 5.5V supply voltage range with 8mA output current capability. The 74VHC244MX is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. Substitute parts maintain functional equivalence while offering improved availability and extended product lifecycle status.

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	8mA, 8mA
Voltage - Supply	2V ~ 5.5V
Package / Case	20-SOIC (0.295", 7.50mm Width)
Mounting Type	Surface Mount
RoHS Status	ROHS3 Compliant

Substitute Part Grouping Explanation

Substitution for the 74VHC244MX is determined by the following critical parameters: logic type (buffer, non-inverting), element and bit configuration (2 elements, 4 bits per element), output type (3-state), output current specifications (8mA, 8mA), supply voltage range (2V ~ 5.5V), and package type (20-SOIC surface mount). All substitute parts listed maintain these core electrical and mechanical specifications, ensuring functional compatibility in existing circuit designs.

Substitute parts are categorized by manufacturer and product status: the MC74VHC244DWR2G represents the manufacturer-recommended active alternative from onsemi; the SN74AHC244DWR and SN74AHC244DW are direct equivalents from Texas Instruments with active or discontinued status; the 74AHC244D,118 from NXP USA Inc. provides an upgrade option; and the SN74AHC244NSR offers a similar alternative with package width variation.

Parameter Comparison

Parameter	74VHC244MX	MC74VHC244DWR2G	SN74AHC244DWR	SN74AHC244DW	74AHC244D,118	SN74AHC244NSR
Manufacturer	onsemi	onsemi	Texas Instruments	Texas Instruments	NXP USA Inc.	Texas Instruments
Product Status	Obsolete	Active	Active	Discontinued at DiGi Electronics	Active	Active
Logic Type	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting	Buffer, Non-Inverting
Number of Elements	2	2	2	2	2	2
Number of Bits per Element	4	4	4	4	4	4
Output Type	3-State	3-State	3-State	3-State	3-State	3-State
Current - Output High, Low	8mA, 8mA	8mA, 8mA	8mA, 8mA	8mA, 8mA	8mA, 8mA	8mA, 8mA
Voltage - Supply	2V ~ 5.5V	2V ~ 5.5V	2V ~ 5.5V	2V ~ 5.5V	2V ~ 5.5V	2V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-55°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C	-40°C ~ 125°C
Package / Case	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.295", 7.50mm Width)	20-SOIC (0.209", 5.30mm Width)
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	Not specified	ROHS3 Compliant
Packaging	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®	Cut Tape (CT) & Digi-Reel®	Tube	Bulk	Tape & Reel (TR)

Engineering Selection Recommendations

For new designs and production continuity, the MC74VHC244DWR2G is the primary recommended substitute, offering active product status from the original manufacturer onsemi with extended operating temperature range (-55°C ~ 125°C) and ROHS3 compliance. This part maintains identical electrical specifications and package dimensions while providing superior lifecycle support.

The SN74AHC244DWR from Texas Instruments serves as an active alternative with equivalent electrical performance and ROHS3 compliance. This part is suitable for applications requiring active product status and extended temperature operation (-40°C ~ 125°C).

The 74AHC244D,118 from NXP USA Inc. provides an upgrade option with active status and identical electrical specifications. This part is available in bulk packaging and maintains full functional compatibility.

The SN74AHC244NSR offers similar functionality with active product status but features a narrower package width (0.209" versus 0.295"), requiring PCB layout verification before implementation.

The SN74AHC244DW from Texas Instruments is discontinued at DiGi Electronics and should be considered only when existing inventory is available and lifecycle support is not a requirement.

Frequently Asked Questions (FAQ)

Q: Can the 74VHC244MX be directly replaced with the MC74VHC244DWR2G?

A: Yes. Both parts maintain identical logic type, element configuration, output type, current specifications, supply voltage range, and package dimensions (20-SOIC, 0.295" width). The MC74VHC244DWR2G offers extended operating temperature range and active product status.

Q: What is the difference between the SN74AHC244DWR and SN74AHC244DW?

A: Both parts are functionally equivalent with identical electrical specifications. The primary difference is packaging: SN74AHC244DWR is supplied in Cut Tape & Digi-Reel format, while SN74AHC244DW is supplied in Tube format. The SN74AHC244DWR is currently active, while the SN74AHC244DW is discontinued at DiGi Electronics.

Q: Is the SN74AHC244NSR compatible with existing PCB designs for the 74VHC244MX?

A: The SN74AHC244NSR maintains all electrical specifications and mounting type but features a different package width (0.209" versus 0.295"). PCB layout verification is required to confirm footprint compatibility before implementation.

Q: Are all substitute parts ROHS3 compliant?

A: All substitute parts except 74AHC244D,118 are specified as ROHS3 compliant. The 74AHC244D,118 RoHS status is not specified in available documentation.

Q: What is the operating temperature range difference between the 74VHC244MX and its substitutes?

A: The 74VHC244MX operates from -40°C to 85°C. Most substitutes extend the upper limit to 125°C, with the MC74VHC244DWR2G extending the lower limit to -55°C. Application requirements determine whether extended temperature range is necessary.

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