74ACTQ245QSC Equivalent & Substitute Parts

Part Overview

The 74ACTQ245QSC is a non-inverting transceiver logic IC manufactured by onsemi, featuring 1 element with 8 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-QSOP surface mount package. The part is currently classified as obsolete, making equivalent and substitute parts necessary for ongoing system support and new design implementations.

Substiute Parts

74ACTQ245QSC

onsemiIn Stock: 121174ACTQ245QSC Datasheet

Current PartRFQ

CD74ACT245SM96

Texas InstrumentsIn Stock: 778CD74ACT245SM96 Datasheet

SimilarRFQ

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 for the 74ACTQ245QSC is determined by strict equivalence across 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 (MSL): 1 (Unlimited)

All identified substitute parts maintain these core electrical and functional specifications. Package variations (QSOP, SSOP, TSSOP) represent different physical form factors of the same logic function and are interchangeable when PCB layout accommodates the dimensional differences. All substitute parts are manufactured by Texas Instruments and carry active product status, providing long-term availability and supply chain stability compared to the obsolete onsemi original.

Parameter Comparison

Engineering Selection Recommendations

All three Texas Instruments substitute parts (CD74ACT245SM96, SN74ACT245DBR, SN74ACT245PWR) meet the electrical and functional requirements of the obsolete 74ACTQ245QSC. Selection among these active alternatives should be based on:

Product Status & Availability: All substitute parts carry active product status, ensuring long-term supply chain availability and manufacturing support. This contrasts with the obsolete onsemi original.

Compliance & Certifications: All substitute parts are ROHS3 compliant, meeting current environmental and regulatory standards. All parts maintain REACH unaffected status and EAR99 export classification.

Package Considerations: The three substitutes differ in package form factor. The SN74ACT245PWR (20-TSSOP, 0.173" width) offers the most compact footprint. The CD74ACT245SM96 and SN74ACT245DBR (both 20-SSOP, 0.209" width) provide intermediate spacing. PCB layout and thermal management requirements should guide package selection.

Temperature Range: The CD74ACT245SM96 extends the operating temperature range to -55°C ~ 125°C, providing enhanced performance margin for applications requiring extended temperature operation. The SN74ACT245DBR and SN74ACT245PWR maintain the -40°C ~ 85°C range matching the original specification.

Frequently Asked Questions (FAQ)

Q: Can I directly replace the 74ACTQ245QSC with any of these substitute parts?

A: Direct replacement depends on package compatibility. The original 74ACTQ245QSC uses a 20-QSOP package (0.154" width). The substitute parts use different packages (SSOP or TSSOP). Electrical function is identical, but PCB layout modifications may be required to accommodate different package dimensions and pin spacing.

Q: What is the difference between the three Texas Instruments substitutes?

A: All three parts are electrically equivalent with identical logic function, output current, and supply voltage specifications. The primary differences are package form factor (SSOP vs. TSSOP) and operating temperature range. The CD74ACT245SM96 offers extended temperature operation (-55°C ~ 125°C) compared to the other two (-40°C ~ 85°C).

Q: Are all substitute parts RoHS compliant?

A: Yes. All three Texas Instruments substitute parts are ROHS3 compliant, meeting current environmental regulations. The original onsemi part does not specify RoHS status.

Q: Which substitute should I choose for a new design?

A: For new designs, any of the three active Texas Instruments parts is suitable. Selection should prioritize package compatibility with your PCB layout and thermal requirements. The SN74ACT245PWR offers the smallest footprint. The CD74ACT245SM96 provides the widest operating temperature range if extended temperature performance is required.

Q: Is the 3-state output function preserved in all substitutes?

A: Yes. All substitute parts maintain the 3-state output configuration with 24mA output current capability (both high and low), identical to the original 74ACTQ245QSC specification.