74VHCT244ASJ Equivalent & Substitute Parts

Part Overview

The 74VHCT244ASJ is a non-inverting buffer logic IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This component 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.

Key Parameters

Parameter	Value
Manufacturer Part Number	74VHCT244ASJ
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)
Mounting Type	Surface Mount
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74VHCT244ASJ is determined by the following critical parameters:

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
Mounting Type: Surface Mount
Package compatibility: 20-SOIC or 20-SOP variants

Substitute parts are grouped into two categories: direct functional equivalents from alternative manufacturers (Texas Instruments) and compatible variants from the same manufacturer (onsemi) with enhanced specifications or different packaging formats. All listed substitutes maintain the core electrical characteristics required for drop-in replacement functionality.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Supply Voltage	Temp Range (°C)	Package	Status
74VHCT244ASJ	onsemi	Buffer, Non-Inverting	2	4	3-State	8, 8	4.5 ~ 5.5V	-40 ~ 85	20-SOIC (0.209")	Obsolete
MC74VHCT244ADWRG	onsemi	Buffer, Non-Inverting	2	4	3-State	8, 8	4.5 ~ 5.5V	-40 ~ 125	20-SOIC (0.295")	Active
SN74AHCT244NSR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	8, 8	4.5 ~ 5.5V	-40 ~ 125	20-SOIC (0.209")	Active
SN74LV244ATNSR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	16, 16	4.5 ~ 5.5V	-40 ~ 85	20-SOIC (0.209")	Active
CAHCT244QDWRG4Q1	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	8, 8	4.5 ~ 5.5V	-40 ~ 125	20-SOIC (0.295")	Obsolete
SN74AHCT244DW	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	8, 8	4.5 ~ 5.5V	-40 ~ 125	20-SOIC (0.295")	Discontinued
SN74AHCT244DWR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	8, 8	4.5 ~ 5.5V	-40 ~ 125	20-SOIC (0.295")	Active
SN74AHCT244MDWREP	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	8, 8	4.5 ~ 5.5V	-55 ~ 125	20-SOIC (0.295")	Active
SN74AHCT244QDWR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	8, 8	4.5 ~ 5.5V	-40 ~ 125	20-SOIC (0.295")	Active
SN74AHCT244QDWRQ1	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	8, 8	4.5 ~ 5.5V	-40 ~ 125	20-SOIC (0.295")	Active

Engineering Selection Recommendations

For applications requiring the 74VHCT244ASJ, the following selection criteria apply based on product status and compliance:

Primary Recommendation - Active Status Parts: SN74AHCT244DWR, SN74AHCT244QDWR, and SN74AHCT244QDWRQ1 from Texas Instruments are actively manufactured and provide full functional equivalence with extended operating temperature range (-40°C to 125°C). These parts maintain the required 8mA output current specification and 4.5V to 5.5V supply voltage compatibility. The QDWRQ1 variant includes AEC-Q100 automotive qualification.

Alternative - onsemi Active Part: MC74VHCT244ADWRG from onsemi is actively produced and maintains electrical equivalence. This part features an extended temperature range to 125°C and is available in Tape & Reel packaging. Package width differs at 0.295" versus the original 0.209", requiring PCB layout verification.

Extended Temperature Range Option: SN74AHCT244MDWREP provides the widest operating temperature range (-55°C to 125°C) for applications requiring enhanced thermal performance, while maintaining all core electrical specifications.

Note on SN74LV244ATNSR: This part features doubled output current (16mA versus 8mA) and should only be selected if the application can accommodate increased current draw without adverse effects on power distribution or thermal management.

Frequently Asked Questions (FAQ)

Q: Can the 74VHCT244ASJ be directly replaced with SN74AHCT244DWR? A: Yes. Both parts maintain identical logic type, element count, bit configuration, output type, and current specifications. The primary difference is package width (0.295" versus 0.209"), which requires PCB footprint compatibility verification before substitution.

Q: What is the difference between the 74VHCT and 74AHCT series? A: Both series are non-inverting buffers with identical functional specifications for this application. The 74AHCT series from Texas Instruments is actively manufactured, while the 74VHCT series from onsemi is obsolete. Electrical performance is equivalent within the specified supply voltage and temperature ranges.

Q: Is the SN74LV244ATNSR a suitable substitute? A: The SN74LV244ATNSR maintains functional equivalence but provides 16mA output current instead of 8mA. This higher current capability may be acceptable depending on application requirements, but should not be assumed as a direct replacement without circuit analysis.

Q: What packaging options are available for substitutes? A: Substitutes are available in 20-SOIC packages with two width variants: 0.209" (matching the original 74VHCT244ASJ) and 0.295" (wider variant). Packaging format options include Tape & Reel, Cut Tape & Digi-Reel, and Tube. Verify PCB footprint compatibility before selection.

Q: Are there automotive-qualified alternatives? A: Yes. The SN74AHCT244QDWRQ1 and CAHCT244QDWRG4Q1 are both AEC-Q100 qualified for automotive applications. The QDWRQ1 is actively manufactured, while the CAHCT244QDWRG4Q1 is obsolete.

Q: What is the moisture sensitivity level (MSL) for substitute parts? A: All listed substitutes maintain MSL 1 (Unlimited) or MSL 3 (168 Hours). The original 74VHCT244ASJ and most active substitutes are MSL 1, indicating no moisture sensitivity restrictions for storage and handling.

Request Quote (Ships tomorrow)

Part Number

Quantity

Company

Contact Name

E-mail

Message