74ACTQ245MSA Equivalent & Substitute Parts

Part Overview

The 74ACTQ245MSA is a non-inverting transceiver IC manufactured by onsemi, designed for 8-bit bidirectional data transmission with 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 classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement continuity.

Substiute Parts

74ACTQ245MSA

onsemiIn Stock: 86474ACTQ245MSA Datasheet

Current PartRFQ

MC74ACT245DTG

onsemiIn Stock: 1677MC74ACT245DTG Datasheet

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CD74ACT245SM96

Texas InstrumentsIn Stock: 778CD74ACT245SM96 Datasheet

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SN74ACT245DBR

Texas InstrumentsIn Stock: 5490SN74ACT245DBR Datasheet

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SN74ACT245PWR

Texas InstrumentsIn Stock: 3994SN74ACT245PWR Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74ACTQ245MSA is determined by the following critical parameters:

• Logic Type: Transceiver, Non-Inverting
• Number of Elements: 1
• Number of Bits per Element: 8
• Output Type: 3-State
• Current - Output High, Low: 24mA, 24mA
• Voltage - Supply: 4.5V ~ 5.5V
• Mounting Type: Surface Mount
• Moisture Sensitivity Level: 1 (Unlimited)

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

Group 1 - 20-SSOP Package (Direct Pin-Compatible): MC74ACT245DTG, CD74ACT245SM96, SN74ACT245DBR

Group 2 - 20-TSSOP Package (Narrower Width): SN74ACT245PWR

All substitute parts maintain identical electrical specifications and functional characteristics. Package differences reflect dimensional variations only, with 20-TSSOP being narrower (0.173" vs 0.209") while maintaining the same pin count and pitch.

Parameter Comparison

Engineering Selection Recommendations

For Direct Pin-Compatible Replacement (20-SSOP Package):

SN74ACT245DBR is the preferred substitute. This Texas Instruments part maintains identical electrical specifications and package dimensions while offering active product status and ROHS3 compliance. With 5400 units in stock, it provides immediate availability.

CD74ACT245SM96 offers an extended operating temperature range (-55°C to 125°C) compared to the original specification (-40°C to 85°C), providing additional thermal margin for demanding applications. This part is also ROHS3 compliant and maintains active product status.

MC74ACT245DTG is available from onsemi with 1661 units in stock but carries obsolete product status, limiting its long-term viability for new designs.

For Package-Variant Substitution (20-TSSOP Package):

SN74ACT245PWR provides equivalent electrical performance in a narrower 20-TSSOP package (0.173" width vs 0.209" for SSOP). This Texas Instruments part is ROHS3 compliant, maintains active product status, and has 3900 units in stock. PCB layout modifications are required to accommodate the different package footprint.

Compliance Considerations:

All substitute parts carry REACH Unaffected status and EAR99 ECCN classification, matching the original part's regulatory profile. Texas Instruments substitutes provide ROHS3 compliance certification, supporting environmental and regulatory requirements for modern applications.

Frequently Asked Questions (FAQ)

Q: Can SN74ACT245PWR be used as a direct replacement for 74ACTQ245MSA?

A: SN74ACT245PWR is electrically equivalent but uses a different package (20-TSSOP vs 20-SSOP). While pin count and function are identical, the physical footprint is narrower. PCB redesign is required; direct socket substitution is not possible.

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

A: Both packages contain 20 pins with identical pitch and pin assignments. The 20-TSSOP package is narrower (0.173" vs 0.209" width), reducing board space requirements. Electrical performance is identical; only physical dimensions differ.

Q: Why does CD74ACT245SM96 have a wider operating temperature range?

A: CD74ACT245SM96 operates from -55°C to 125°C, compared to -40°C to 85°C for the original part. This extended range reflects Texas Instruments' design specifications for this product line and provides additional thermal margin for applications requiring wider temperature operation.

Q: Are all substitute parts ROHS3 compliant?

A: Texas Instruments substitutes (CD74ACT245SM96, SN74ACT245DBR, SN74ACT245PWR) are ROHS3 compliant. MC74ACT245DTG does not specify RoHS status. For applications requiring ROHS3 certification, select Texas Instruments alternatives.

Q: Which substitute part has the best availability?

A: SN74ACT245DBR offers the highest inventory with 5400 units in stock, followed by SN74ACT245PWR with 3900 units. Both are active products from Texas Instruments with established supply chains.

Q: Can I use CD74ACT245SM96 in applications requiring -40°C to 85°C operation?

A: Yes. CD74ACT245SM96 operates across -55°C to 125°C, which fully encompasses the -40°C to 85°C requirement. The extended range provides additional design margin without compromising performance within the original specification window.