74ACTQ244MSAX Equivalent & Substitute Parts

Part Overview

The 74ACTQ244MSAX 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 within a 4.5V to 5.5V supply voltage range and is housed in a 20-SSOP package. The part is currently classified as obsolete, making identification of functionally equivalent alternatives necessary for ongoing design support and production continuity.

Key Parameters

Parameter	Value
Manufacturer Part Number	74ACTQ244MSAX
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	24mA, 24mA
Voltage - Supply	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C (TA)
Mounting Type	Surface Mount
Package / Case	20-SSOP (0.209", 5.30mm Width)
Moisture Sensitivity Level (MSL)	1 (Unlimited)
Product Status	Obsolete

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACTQ244MSAX 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: 24mA, 24mA
Voltage - Supply: 4.5V ~ 5.5V
Operating Temperature: -40°C ~ 85°C (TA)
Mounting Type: Surface Mount

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

Package-Compatible Substitutes (20-SSOP): Parts maintaining the identical 20-SSOP package footprint as the original component, enabling direct PCB replacement without layout modification.

Functionally Equivalent Substitutes (20-TSSOP): Parts with identical electrical specifications but housed in a 20-TSSOP package (0.173", 4.40mm Width), requiring PCB layout adjustment but offering equivalent circuit functionality.

Parameter Comparison

Part Number	Manufacturer	Logic Type	Elements	Bits/Element	Output Type	Current (mA)	Supply Voltage	Temp Range	Package	Product Status
74ACTQ244MSAX	onsemi	Buffer, Non-Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SSOP	Obsolete
SN74ACT244DBR	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SSOP	Active
CD74ACT244SM96	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-SSOP	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	Active
SN74ACT244PW	Texas Instruments	Buffer, Non-Inverting	2	4	3-State	24, 24	4.5V ~ 5.5V	-40°C ~ 85°C	20-TSSOP	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	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	Active

Engineering Selection Recommendations

Primary Recommendation - Direct Package Replacement: SN74ACT244DBR is the preferred substitute for the 74ACTQ244MSAX. This Texas Instruments component maintains identical electrical specifications and package geometry (20-SSOP), enabling direct PCB substitution without layout modification. The part carries Active product status with ROHS3 compliance and unlimited moisture sensitivity rating, ensuring long-term availability and regulatory alignment.

Alternative - Package-Compatible Equivalent: SN74ACT241DBR provides equivalent functionality within the same 20-SSOP package footprint. This part is currently Active and ROHS3 compliant, offering a viable alternative when SN74ACT244DBR availability is constrained.

Secondary Option - Functionally Equivalent with Package Change: SN74ACT244PWR delivers identical electrical performance but requires PCB layout modification due to its 20-TSSOP package footprint. This part is currently Active with the highest inventory availability (45,400 units), making it suitable for new designs or redesign scenarios where package footprint adjustment is acceptable.

Parts with Discontinued status (CD74ACT244SM96, SN74ACT244PW, SN74ACT244PWE4) should be considered only when existing inventory is available and long-term supply is not a requirement.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT244DBR replace the 74ACTQ244MSAX directly on the PCB? A: Yes. SN74ACT244DBR maintains identical electrical specifications and 20-SSOP package dimensions, enabling direct component substitution without PCB layout modification.

Q: What is the difference between 20-SSOP and 20-TSSOP packages? A: Both are 20-pin surface mount packages with different body widths. The 20-SSOP measures 0.209" (5.30mm) width, while the 20-TSSOP measures 0.173" (4.40mm) width. Pin pitch and electrical connections remain compatible, but PCB footprints differ and require layout adjustment.

Q: Why is the 74ACTQ244MSAX listed as obsolete? A: Obsolete status indicates the manufacturer has discontinued production. Substitute parts from active manufacturers ensure continued design support and production availability.

Q: Are all substitute parts ROHS3 compliant? A: All Texas Instruments substitutes listed carry ROHS3 compliance. The original onsemi part does not specify RoHS status in the provided data.

Q: Which substitute offers the best long-term availability? A: SN74ACT244PWR is currently Active with the highest inventory level (45,400 units). For designs requiring package footprint compatibility, SN74ACT244DBR is Active with 4,437 units in stock.

Q: Can I use SN74ACT241DBR as a substitute? A: Yes. SN74ACT241DBR is functionally equivalent with identical electrical specifications and 20-SSOP package compatibility. It is currently Active and ROHS3 compliant.

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