FST3125DTR2G Equivalent & Substitute Parts

Part Overview

The FST3125DTR2G is a bus switch IC manufactured by onsemi, designed for 1 x 1:1 switching applications in logic circuits. This component features a 14-TSSOP surface mount package and operates across a single supply voltage range of 4V to 5.5V. The part is classified as obsolete, making identification of functionally equivalent alternatives essential for ongoing design support and production continuity.

Substiute Parts

FST3125DTR2G

onsemiIn Stock: 895FST3125DTR2G Datasheet

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FST3125MTCX

onsemiIn Stock: 37870FST3125MTCX Datasheet

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Key Parameters

Substitute Part Grouping Explanation

Substitution for the FST3125DTR2G is determined by strict equivalence across the following critical parameters:

• Circuit Configuration: 1 x 1:1 bus switch topology with 4 independent circuits
• Package Type: 14-TSSOP surface mount package with identical 0.173" (4.40mm) width
• Voltage Supply Range: Single supply operation within 4V to 5.5V specification
• Mounting Technology: Surface mount compatibility
• Compliance Standards: ROHS3 compliance and REACH unaffected status

The FST3125MTCX qualifies as a direct substitute based on matching circuit configuration, package type, voltage supply range, and compliance certifications. This part maintains functional and mechanical compatibility while differing in packaging format (Tape & Reel versus individual packaging) and operating temperature range.

Parameter Comparison

Engineering Selection Recommendations

The FST3125MTCX serves as the primary equivalent substitute for the FST3125DTR2G. Both parts share identical electrical specifications, circuit topology, and package geometry. The key distinction is the operating temperature range: the FST3125MTCX operates from -40°C to 85°C, compared to the FST3125DTR2G range of -55°C to 125°C. Applications requiring the full extended temperature range of the original part must account for this limitation.

Both parts maintain ROHS3 compliance and unlimited moisture sensitivity level (MSL 1), ensuring compatibility with modern manufacturing and environmental standards. The packaging format difference (Tape & Reel for the substitute) affects procurement and assembly logistics but does not impact electrical or mechanical performance.

Frequently Asked Questions (FAQ)

Q: Can FST3125MTCX replace FST3125DTR2G in all applications?

A: FST3125MTCX is electrically and mechanically compatible for applications operating within -40°C to 85°C. Applications requiring operation below -40°C or above 85°C require evaluation against the original part's extended temperature range of -55°C to 125°C.

Q: What is the difference between the packaging formats?

A: FST3125DTR2G is supplied in individual packaging, while FST3125MTCX is supplied in Tape & Reel (TR) format. Both contain identical die and package geometry. The format difference affects procurement quantities and assembly automation compatibility, not component performance.

Q: Are both parts RoHS compliant?

A: Yes. Both FST3125DTR2G and FST3125MTCX are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: Why is the original part marked as obsolete?

A: Product obsolescence indicates the manufacturer has discontinued production. FST3125MTCX, also obsolete, represents the available equivalent from the same manufacturer. For long-term supply assurance, alternative manufacturers offering compatible 1 x 1:1 bus switch ICs in 14-TSSOP packages may be evaluated.

Q: Are the pin configurations identical?

A: Both parts use the 14-TSSOP package with identical physical dimensions (0.173" width, 4.40mm). Pin configuration and functionality are equivalent for direct board-level substitution.