74ACT244SJ Equivalent & Substitute Parts

Part Overview

The 74ACT244SJ 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 substitute parts necessary for ongoing design support and procurement.

The 74ACT244 series provides buffering functionality for digital logic applications requiring high-speed signal distribution with output control. The SJ package variant (20-SOP) is surface-mount compatible and operates across industrial temperature ranges.

Substiute Parts

74ACT244SJ

onsemiIn Stock: 92274ACT244SJ Datasheet

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74ACT244MTC

onsemiIn Stock: 440574ACT244MTC Datasheet

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74ACT244SC

onsemiIn Stock: 172674ACT244SC Datasheet

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CD74ACT244M96

Texas InstrumentsIn Stock: 2027CD74ACT244M96 Datasheet

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SN74ACT244DW

Texas InstrumentsIn Stock: 7278SN74ACT244DW Datasheet

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SN74ACT244DWR

Texas InstrumentsIn Stock: 93153SN74ACT244DWR Datasheet

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SN74ACT244MNSREP

Texas InstrumentsIn Stock: 2291SN74ACT244MNSREP Datasheet

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SN74ACT244NSR

Texas InstrumentsIn Stock: 2425SN74ACT244NSR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the 74ACT244SJ is determined by strict equivalence across 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
• Mounting Type: Surface Mount
• Base Product Number: 74ACT244 series

Substitute parts are grouped by package type. The 74ACT244SJ uses a 20-SOP package (0.209" width). Direct electrical equivalents exist in alternative package configurations (20-TSSOP, 20-SOIC wider variants, 20-SO) from both onsemi and Texas Instruments manufacturers. Package selection depends on PCB layout constraints and board assembly capabilities.

Parameter Comparison

Engineering Selection Recommendations

For replacement of the obsolete 74ACT244SJ, the following selection criteria apply:

Package-Matched Substitutes (20-SOP / 20-SO, 0.209" width):

• SN74ACT244MNSREP (Texas Instruments, Active, ROHS3 Compliant) — Identical package footprint with extended temperature range (-55°C ~ 125°C)
• SN74ACT244NSR (Texas Instruments, Active, ROHS3 Compliant) — Identical package footprint with standard temperature range

Compact Package Alternative (20-TSSOP, 0.173" width):

• 74ACT244MTC (onsemi, Active, ROHS3 Compliant) — Narrower package for space-constrained layouts

Wider Package Alternatives (20-SOIC, 0.295" width):

• 74ACT244SC (onsemi, Active, ROHS3 Compliant)
• CD74ACT244M96 (Texas Instruments, Active, ROHS3 Compliant)
• SN74ACT244DWR (Texas Instruments, Active, ROHS3 Compliant) — Highest inventory availability

All substitute parts maintain identical electrical specifications (24mA output current, 4.5V ~ 5.5V supply, 3-state output). Selection depends on PCB layout compatibility and package availability. Active product status and ROHS3 compliance ensure long-term supply continuity.

Frequently Asked Questions (FAQ)

Q: Can I use a 74ACT244 part with a different package than the original 74ACT244SJ?

A: Yes, provided the electrical specifications remain identical. Package differences (20-SOP, 20-TSSOP, 20-SOIC, 20-SO) do not affect functional compatibility. PCB layout and assembly equipment capabilities determine package suitability. Verify footprint compatibility with your board design before procurement.

Q: What is the difference between 20-SOP and 20-SO packages?

A: Both are 20-pin surface-mount packages with 0.209" width. The designations are manufacturer-specific nomenclature for the same physical form factor. Parts specified as 20-SO or 20-SOP are mechanically and electrically interchangeable.

Q: Why does SN74ACT244MNSREP have a wider operating temperature range (-55°C ~ 125°C) than the original part (-40°C ~ 85°C)?

A: Extended temperature range indicates the component meets more stringent qualification standards. This part is suitable for applications requiring broader temperature operation and does not compromise compatibility with designs specified for the standard range.

Q: Is the 74ACT244SC (onsemi) equivalent to the SN74ACT244DWR (Texas Instruments)?

A: Yes, electrically equivalent. Both are 20-SOIC packages with identical logic specifications, output current, and supply voltage. Manufacturer differences do not affect functional performance. Selection may depend on supplier availability and packaging preferences (Tube vs. Cut Tape & Digi-Reel).

Q: What does "Discontinued at DiGi Electronics" mean for the SN74ACT244DW?

A: This part is no longer stocked by DiGi Electronics but remains available through other distributors. The SN74ACT244DWR (reel packaging variant) is the active equivalent from Texas Instruments and is recommended for new designs.

Q: Are all substitute parts ROHS3 compliant?

A: All active substitute parts listed are ROHS3 compliant. The original 74ACT244SJ (obsolete status) does not have RoHS certification specified. Compliance status is relevant for new procurement and regulatory requirements.