74ACT244MSA Equivalent & Substitute Parts

Part Overview

The 74ACT244MSA 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 is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement.

The 74ACT244 series provides buffering functionality suitable for digital logic applications requiring signal isolation and drive capability across 4.5V to 5.5V supply ranges. Substitute parts maintain functional equivalence while offering improved availability and product status.

Substiute Parts

74ACT244MSA

onsemiIn Stock: 148474ACT244MSA Datasheet

Current PartRFQ

SN74ACT244DBR

Texas InstrumentsIn Stock: 4507SN74ACT244DBR Datasheet

DirectRFQ

CD74ACT244SM96

Texas InstrumentsIn Stock: 884CD74ACT244SM96 Datasheet

SimilarRFQ

SN74ACT244IPWRQ1

Texas InstrumentsIn Stock: 2732SN74ACT244IPWRQ1 Datasheet

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SN74ACT244PW

Texas InstrumentsIn Stock: 2307SN74ACT244PW Datasheet

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SN74ACT244PWE4

Texas InstrumentsIn Stock: 878SN74ACT244PWE4 Datasheet

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SN74ACT244PWR

Texas InstrumentsIn Stock: 45441SN74ACT244PWR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution of the 74ACT244MSA is determined by strict equivalence across 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)
• Moisture Sensitivity Level: 1 (Unlimited)

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

Category 1: 20-SSOP Package (0.209", 5.30mm Width)

• Direct functional and package equivalents
• Identical pinout and mechanical dimensions

Category 2: 20-TSSOP Package (0.173", 4.40mm Width)

• Functionally equivalent with different package footprint
• Requires PCB layout modification due to reduced width
• Maintains all electrical specifications

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: SN74ACT244DBR

The SN74ACT244DBR is the optimal substitute for the 74ACT244MSA. This part maintains identical package configuration (20-SSOP, 5.30mm width), eliminating PCB layout modifications. The part is manufactured by Texas Instruments with Active product status, ensuring long-term availability. ROHS3 compliance satisfies modern regulatory requirements. Inventory availability of 4437 units supports immediate procurement.

Alternative for Space-Constrained Designs: SN74ACT244PWR

The SN74ACT244PWR provides functional equivalence with a narrower 20-TSSOP package (4.40mm width), suitable for designs requiring reduced component footprint. This part is Active status with 45400 units in stock, offering superior availability. ROHS3 compliance and AEC-Q100 qualification support automotive and industrial applications. PCB layout modification is required due to package geometry change.

Automotive-Grade Option: SN74ACT244IPWRQ1

For applications requiring automotive qualification, the SN74ACT244IPWRQ1 provides AEC-Q100 certification with Active product status. The 20-TSSOP package requires layout modification. This part is suitable for automotive and mission-critical applications where qualification documentation is mandatory.

Avoid: CD74ACT244SM96, SN74ACT244PW, SN74ACT244PWE4

These parts are discontinued at DiGi Electronics and should not be selected for new designs or long-term production requirements.

Frequently Asked Questions (FAQ)

Q: Can I use SN74ACT244PWR as a direct replacement for 74ACT244MSA without PCB modification?

A: No. The SN74ACT244PWR uses a 20-TSSOP package (4.40mm width) compared to the 74ACT244MSA's 20-SSOP package (5.30mm width). While electrically equivalent, the different package footprint requires PCB layout modification. The SN74ACT244DBR provides identical package geometry and requires no layout changes.

Q: What is the difference between 20-SSOP and 20-TSSOP packages?

A: Both are 20-pin surface mount packages with identical pin count and electrical specifications. The primary difference is package width: 20-SSOP measures 5.30mm width, while 20-TSSOP measures 4.40mm width. The narrower TSSOP package is suitable for space-constrained applications but requires different PCB footprints.

Q: Is the 74ACT244MSA still available for purchase?

A: The 74ACT244MSA is classified as obsolete. Active substitutes such as SN74ACT244DBR and SN74ACT244PWR are recommended for new designs and ongoing production.

Q: Do all substitute parts meet RoHS compliance?

A: All Texas Instruments substitutes listed are ROHS3 compliant. The original 74ACT244MSA RoHS status is not specified in available documentation.

Q: Which substitute part has the highest inventory availability?

A: The SN74ACT244PWR has the highest inventory with 45400 units in stock, followed by SN74ACT244DBR with 4437 units.

Q: Can I use SN74ACT244IPWRQ1 in non-automotive applications?

A: Yes. The SN74ACT244IPWRQ1 is functionally equivalent to all other substitutes and can be used in any application requiring 74ACT244 specifications. The AEC-Q100 qualification is an additional certification that does not restrict use in non-automotive designs.