74ACT244MSAX Equivalent & Substitute Parts

Part Overview

The 74ACT244MSAX is a non-inverting buffer IC manufactured by onsemi, featuring 2 elements with 4 bits per element and 3-state output capability. This logic buffer operates at 4.5V to 5.5V supply voltage with 24mA output current capacity and is housed in a 20-SSOP package. The part is currently listed as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

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	24mA, 24mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution for the 74ACT244MSAX is determined by strict equivalence in the following electrical and mechanical parameters:

Logic Type: Buffer, Non-Inverting
Number of Elements: 2
Number of Bits per Element: 4
Output Type: 3-State
Current - Output High, Low: 24mA, 24mA
Voltage - Supply: 4.5V ~ 5.5V
Operating Temperature: -40°C ~ 85°C (TA)
Mounting Type: Surface Mount
Series: 74ACT

Substitute parts are grouped into two categories based on package compatibility:

Group 1: 20-TSSOP Package Substitutes — Parts with identical electrical specifications but narrower package width (4.40mm vs 5.30mm). These are direct functional replacements suitable for designs where PCB layout permits the smaller footprint.

Group 2: 20-SSOP Package Equivalents — Parts with identical electrical specifications and matching 20-SSOP package (5.30mm width). These provide pin-for-pin and footprint compatibility with the original 74ACT244MSAX.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Supply Voltage	Temp Range	Package	Package Width	Product Status
74ACT244MSAX	onsemi	Buffer, Non-Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SSOP	5.30mm	Obsolete
SN74ACT244IPWRQ1	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-TSSOP	4.40mm	Active
SN74ACT244PW	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-TSSOP	4.40mm	Discontinued at DiGi Electronics
SN74ACT244PWE4	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-TSSOP	4.40mm	Discontinued at DiGi Electronics
SN74ACT244PWR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-TSSOP	4.40mm	Active
CD74ACT244SM96	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SSOP	5.30mm	Discontinued at DiGi Electronics
SN74ACT241DBR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SSOP	5.30mm	Active
SN74ACT244DBR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SSOP	5.30mm	Active

Engineering Selection Recommendations

For designs currently using the obsolete 74ACT244MSAX, the following selection criteria apply:

For PCB Layout Compatibility (Same Footprint Required): Select SN74ACT244DBR or SN74ACT241DBR. Both are active products from Texas Instruments in the 20-SSOP package matching the original 5.30mm width. SN74ACT244DBR maintains identical base product numbering and is the primary recommendation. SN74ACT241DBR is functionally equivalent with active product status and full RoHS3 compliance.

For Active Product Status with Highest Availability: Select SN74ACT244PWR. This part is active with 45,400 units in stock, operates in the 20-TSSOP package (4.40mm width), and requires PCB layout modification to accommodate the narrower footprint. It carries full RoHS3 compliance and REACH unaffected status.

For Automotive-Grade Applications: Select SN74ACT244IPWRQ1. This part carries AEC-Q100 automotive qualification, operates in the 20-TSSOP package, and maintains active product status with 2,671 units available.

For Discontinued Product Replacement (No New Design Constraint): CD74ACT244SM96 provides 20-SSOP package compatibility but is discontinued at DiGi Electronics. This option is suitable only for legacy system support where new inventory procurement is not required.

Frequently Asked Questions (FAQ)

Q: Can I use a 20-TSSOP package substitute in place of the 20-SSOP original?

A: Yes, functionally. The 20-TSSOP package (4.40mm width) is narrower than the 20-SSOP package (5.30mm width). Pin count and electrical specifications are identical. PCB layout modification is required to accommodate the different footprint. Verify that your PCB design allows for the narrower package before substitution.

Q: What is the difference between SN74ACT244DBR and SN74ACT244PWR?

A: Both are Texas Instruments 74ACT244 buffers with identical electrical specifications. SN74ACT244DBR is packaged in 20-SSOP (5.30mm width) with Cut Tape & Digi-Reel packaging. SN74ACT244PWR is packaged in 20-TSSOP (4.40mm width) with Cut Tape & Digi-Reel packaging. SN74ACT244PWR has significantly higher inventory availability (45,400 units vs 4,437 units).

Q: Is SN74ACT244IPWRQ1 suitable for automotive applications?

A: Yes. SN74ACT244IPWRQ1 carries AEC-Q100 automotive qualification and is the designated automotive-grade equivalent. It operates within the same electrical and temperature specifications as the standard 74ACT244 series.

Q: Why is the original 74ACT244MSAX listed as obsolete?

A: The 74ACT244MSAX is an onsemi product that has reached end-of-life status. Texas Instruments continues to manufacture functionally equivalent 74ACT244 and 74ACT241 buffers in active production, making them the recommended substitutes for new designs and ongoing procurement.

Q: Are all substitute parts RoHS3 compliant?

A: All Texas Instruments substitute parts listed carry RoHS3 compliance. The original 74ACT244MSAX does not specify RoHS status. All parts maintain REACH unaffected status and EAR99 export classification.

Q: What is the MSL rating for these parts?

A: All parts carry MSL 1 (Unlimited), indicating no moisture sensitivity constraints during storage or handling.

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