FST3245MTCX Equivalent & Substitute Parts

Part Overview

The FST3245MTCX is an 8 x 1:1 bus switch logic IC manufactured by onsemi in a 20-TSSOP surface mount package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The FST3245MTCX operates with a single supply voltage range of 4V to 5.5V and maintains an operating temperature range of -40°C to 85°C. Functionally equivalent alternatives are available from Texas Instruments and Diodes Incorporated with compatible electrical and mechanical specifications.

Substiute Parts

FST3245MTCX

onsemiIn Stock: 20587FST3245MTCX Datasheet

Current PartRFQ

PI5C3245LE

Diodes IncorporatedIn Stock: 1468PI5C3245LE Datasheet

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PI5C3245LEX

Diodes IncorporatedIn Stock: 1566PI5C3245LEX Datasheet

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SN74CBT3245ADGVR

Texas InstrumentsIn Stock: 2756SN74CBT3245ADGVR Datasheet

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SN74CBT3245APW

Texas InstrumentsIn Stock: 2236SN74CBT3245APW Datasheet

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SN74CBT3245CPW

Texas InstrumentsIn Stock: 2688SN74CBT3245CPW Datasheet

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SN74CBT3245APWR

Texas InstrumentsIn Stock: 6259SN74CBT3245APWR Datasheet

Parametric EquivalentRFQ

SN74CBT3245CPWR

Texas InstrumentsIn Stock: 3070SN74CBT3245CPWR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FST3245MTCX are qualified based on the following criteria:

Electrical Compatibility: All substitute parts maintain the same 8 x 1:1 bus switch circuit configuration with single supply operation. Voltage supply ranges must support the FST3245MTCX operating window or provide compatible overlap. Operating temperature range must match or exceed -40°C to 85°C.

Mechanical Compatibility: All substitutes use surface mount technology with 20-pin TSSOP or TVSOP packages maintaining the 0.173" (4.40mm) width specification, ensuring PCB footprint compatibility.

Regulatory Compliance: All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and REACH unaffected status, matching the original part's environmental and regulatory requirements.

Packaging Formats: Substitutes are available in multiple packaging options (Tube, Cut Tape, Tape & Reel) to accommodate different procurement and assembly workflows.

Parameter Comparison

Engineering Selection Recommendations

Primary Selection: SN74CBT3245CPW and SN74CBT3245CPWR are recommended as primary substitutes. Both are manufactured by Texas Instruments with Active product status, ensuring long-term availability and supply chain stability. These parts maintain identical electrical specifications (4V ~ 5.5V supply, -40°C ~ 85°C operating range) and package compatibility (20-TSSOP, 0.173" width). SN74CBT3245CPWR offers Cut Tape and Digi-Reel packaging options suitable for high-volume production environments.

Secondary Selection: SN74CBT3245APWR provides an alternative from Texas Instruments in Cut Tape format with equivalent electrical and mechanical specifications, though classified as Last Time Buy. This part maintains 6178 units in inventory, supporting medium to high-volume requirements.

Alternative Sourcing: PI5C3245LE and PI5C3245LEX from Diodes Incorporated are functionally equivalent with compatible 8 x 1:1 circuit configuration and package dimensions. The voltage supply range (4.75V ~ 5.25V) represents a narrower window than the original FST3245MTCX but remains compatible within standard 5V logic supply applications. Both are classified as Last Time Buy.

Package Consideration: SN74CBT3245ADGVR uses a 20-TVSOP package variant instead of TSSOP. While maintaining identical 0.173" (4.40mm) width and electrical specifications, PCB footprint verification is required before substitution to confirm compatibility with existing designs.

All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and REACH unaffected status, meeting regulatory requirements equivalent to the original FST3245MTCX.

Frequently Asked Questions (FAQ)

Q: Can I substitute the FST3245MTCX with any of these parts directly?

A: Direct substitution is possible for parts maintaining identical package types (20-TSSOP). SN74CBT3245CPW, SN74CBT3245CPWR, SN74CBT3245APW, and SN74CBT3245APWR are direct pin-compatible replacements. PI5C3245LE and PI5C3245LEX also use 20-TSSOP packages. SN74CBT3245ADGVR uses 20-TVSOP packaging; verify PCB footprint compatibility before use.

Q: What is the difference between the Diodes Incorporated PI5C3245LE and PI5C3245LEX parts?

A: Both parts are electrically identical with 8 x 1:1 bus switch configuration and matching voltage/temperature specifications. The primary difference is packaging format: PI5C3245LE is supplied in Tube format, while PI5C3245LEX is supplied in Tape & Reel format. Selection depends on assembly process requirements and procurement volume.

Q: Why do some substitutes have narrower voltage supply ranges?

A: PI5C3245LE and PI5C3245LEX specify 4.75V ~ 5.25V supply range compared to the FST3245MTCX range of 4V ~ 5.5V. This narrower specification is typical for Diodes Incorporated logic families and remains compatible with standard 5V logic supply applications. Applications requiring operation below 4.75V or above 5.25V should use Texas Instruments alternatives.

Q: Which substitute offers the best long-term availability?

A: SN74CBT3245CPW and SN74CBT3245CPWR from Texas Instruments maintain Active product status, indicating ongoing manufacturing and support. These parts are preferred for new designs requiring extended product lifecycle support.

Q: Are all substitutes RoHS3 compliant?

A: Yes. All listed substitute parts maintain ROHS3 compliance, MSL Level 1 rating, and REACH unaffected status, matching the environmental and regulatory requirements of the original FST3245MTCX.

Q: What packaging options are available for high-volume production?

A: SN74CBT3245CPWR offers Cut Tape and Digi-Reel packaging suitable for automated assembly lines. PI5C3245LEX provides Tape & Reel format. Both options support high-volume manufacturing workflows.