74VHCT244ASJX Equivalent & Substitute Parts

Part Overview

The 74VHCT244ASJX is a non-inverting buffer logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This device operates across a 4.5V to 5.5V supply voltage range and is housed in a 20-SOP package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	74VHCT244ASJX
Manufacturer	onsemi
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	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Package / Case	20-SOIC (0.209", 5.30mm Width)
Product Status	Obsolete
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution eligibility for the 74VHCT244ASJX is determined by the following core parameters:

Logic Type: Buffer, Non-Inverting
Number of Elements: 2
Number of Bits per Element: 4
Output Type: 3-State
Voltage - Supply: 4.5V ~ 5.5V
Current - Output High, Low: 8mA, 8mA
Package / Case: 20-SOIC form factor compatibility

Substitute parts are grouped into two categories based on these criteria:

Category 1: Direct Functional Equivalents (Same Series Logic) Parts from the 74AHCT and 74VHCT series that maintain identical electrical specifications and output drive characteristics. These parts are pin-compatible and functionally interchangeable within the specified voltage and current parameters.

Category 2: Enhanced Performance Variants (Higher Output Current) The 74LV244 series provides increased output drive capability (16mA vs. 8mA) while maintaining the same logic function, voltage supply range, and package form factor. This variant is suitable for applications requiring higher current sourcing/sinking capability.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Voltage Supply	Temp Range	Package	Status
74VHCT244ASJX	onsemi	Buffer, Non-Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (0.209")	Obsolete
MC74VHCT244ADWRG	onsemi	Buffer, Non-Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40°C ~ 125°C	20-SOIC (0.295")	Active
SN74AHCT244NS	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40°C ~ 125°C	20-SOIC (0.209")	Discontinued at DiGi Electronics
SN74AHCT244NSR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40°C ~ 125°C	20-SOIC (0.209")	Active
SN74LV244ATNSR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	16, 16	4.5V ~ 5.5V	-40°C ~ 85°C	20-SOIC (0.209")	Active
CAHCT244QDWRG4Q1	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40°C ~ 125°C	20-SOIC (0.295")	Obsolete
SN74AHCT244DW	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40°C ~ 125°C	20-SOIC (0.295")	Discontinued at DiGi Electronics
SN74AHCT244DWR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40°C ~ 125°C	20-SOIC (0.295")	Active
SN74AHCT244QDWR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40°C ~ 125°C	20-SOIC (0.295")	Active
SN74AHCT244QDWRQ1	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	8, 8	4.5V ~ 5.5V	-40°C ~ 125°C	20-SOIC (0.295")	Active

Engineering Selection Recommendations

Primary Recommendation: SN74AHCT244NSR This Texas Instruments part maintains identical electrical specifications to the 74VHCT244ASJX with 8mA output drive capability and 4.5V to 5.5V supply voltage operation. The part is currently active in production and ROHS3 compliant. The 20-SOIC (0.209") package matches the original form factor precisely.

Secondary Recommendation: SN74AHCT244DWR An alternative from Texas Instruments with the same electrical performance. This part is active and ROHS3 compliant. The 20-SOIC (0.295") package is slightly wider but maintains functional compatibility. Suitable for applications where package width tolerance permits.

Automotive-Grade Option: SN74AHCT244QDWRQ1 For applications requiring automotive qualification, this AEC-Q100 qualified part provides the same electrical specifications with extended temperature range (-40°C to 125°C). Active production status and ROHS3 compliance are confirmed.

Higher Current Capability: SN74LV244ATNSR When increased output drive current (16mA vs. 8mA) is required, this Texas Instruments part provides enhanced sourcing and sinking capability while maintaining the same logic function and voltage supply range. Operating temperature range is -40°C to 85°C. Active production status confirmed.

onsemi Alternative: MC74VHCT244ADWRG An active onsemi part maintaining the same 74VHCT series logic with identical electrical specifications. Extended temperature range (-40°C to 125°C) and ROHS3 compliance. The 20-SOIC (0.295") package is wider than the original.

Frequently Asked Questions (FAQ)

Q: Can I use SN74AHCT244NSR as a direct replacement for 74VHCT244ASJX? A: Yes. Both parts maintain identical logic type (Buffer, Non-Inverting), element count (2), bits per element (4), output type (3-State), output current (8mA, 8mA), and supply voltage range (4.5V ~ 5.5V). The 20-SOIC (0.209") package form factor is identical. Functional compatibility is confirmed.

Q: What is the difference between the 20-SOIC (0.209") and 20-SOIC (0.295") packages? A: The primary difference is package width. The 0.209" width is narrower than the 0.295" width. Both are 20-pin SOIC packages with identical pin pitch and electrical characteristics. PCB layout and footprint compatibility must be verified before substitution.

Q: Why does SN74LV244ATNSR have higher output current (16mA vs. 8mA)? A: The 74LV series is designed with enhanced output drive capability. This allows the part to source and sink higher currents while maintaining the same logic function and voltage supply range. Use this variant only if your application requires the additional current capability, as it may introduce different electrical loading characteristics.

Q: Is the 74VHCT244ASJX pin-compatible with all listed substitutes? A: Pin compatibility is confirmed for all listed substitutes. All parts feature 2 elements, 4 bits per element, 3-state output, and 20-pin SOIC packaging. Physical package dimensions vary (0.209" vs. 0.295" width), requiring PCB footprint verification.

Q: What does AEC-Q100 qualification mean for SN74AHCT244QDWRQ1? A: AEC-Q100 is an automotive electronics qualification standard. Parts bearing this qualification have undergone stress testing and reliability validation for automotive applications. Use this part when automotive-grade components are specified or required.

Q: Can I substitute an obsolete part with another obsolete part? A: Substitution between obsolete parts (74VHCT244ASJX, CAHCT244QDWRG4Q1) is not recommended for new designs or long-term production. Active production parts (SN74AHCT244NSR, SN74AHCT244DWR, SN74AHCT244QDWR, SN74AHCT244QDWRQ1, SN74LV244ATNSR, MC74VHCT244ADWRG) provide supply continuity and are preferred for design implementation.

Q: Are all substitute parts ROHS3 compliant? A: Yes. All listed substitute parts are ROHS3 compliant, matching the compliance status of the original 74VHCT244ASJX.

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