FST16861MTDX Equivalent & Substitute Parts

Part Overview

The FST16861MTDX is a bus switch IC manufactured by onsemi, configured as a 10 x 1:1 logic switch in a 48-TSSOP package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The FST16861MTDX operates with a single supply voltage between 4V and 5.5V, supporting operating temperatures from -40°C to 85°C. Substitute parts must maintain functional equivalence in circuit topology, electrical specifications, and physical compatibility.

Substiute Parts

FST16861MTDX

onsemiIn Stock: 1153FST16861MTDX Datasheet

Current PartRFQ

SN74CBT16861DGGR

Texas InstrumentsIn Stock: 1980SN74CBT16861DGGR Datasheet

DirectRFQ

SN74CBT16861DGVR

Texas InstrumentsIn Stock: 2281SN74CBT16861DGVR Datasheet

SimilarRFQ

SN74CBT16861DLR

Texas InstrumentsIn Stock: 4491SN74CBT16861DLR Datasheet

SimilarRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the FST16861MTDX are qualified based on the following criteria:

Functional Equivalence: All substitute parts maintain the 10 x 1:1 bus switch circuit topology with 2 independent circuits, ensuring identical functional behavior in switching applications.

Electrical Compatibility: Substitute parts operate within the single supply voltage range of 4.5V ~ 5.5V (note: substitute parts specify 4.5V minimum versus the original 4V minimum) and maintain the same operating temperature range of -40°C to 85°C.

Package Compatibility: Substitute parts are available in three package variants—48-TSSOP, 48-TVSOP, and 48-SSOP—all surface mount configurations with compatible pinouts for the 10 x 1:1 switching function.

Compliance & Certification: All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, REACH unaffected status, and identical ECCN and HTSUS classifications.

Manufacturer Status: Substitute parts are sourced from Texas Instruments (74CBT series), classified as Last Time Buy, providing a clear upgrade path from the obsolete onsemi FST16861MTDX.

Parameter Comparison

Engineering Selection Recommendations

Primary Substitute: SN74CBT16861DGGR

The SN74CBT16861DGGR is the direct functional equivalent with matching 48-TSSOP package geometry (0.240", 6.10mm width). This part maintains identical pinout compatibility and is available in Cut Tape packaging. Selection of this part eliminates any PCB layout modifications and provides the most straightforward replacement path from the obsolete FST16861MTDX.

Alternative Substitute: SN74CBT16861DGVR

The SN74CBT16861DGVR provides functional equivalence with a narrower 48-TVSOP package (0.173", 4.40mm width). This variant is suitable for space-constrained designs where reduced package width is beneficial. PCB layout adjustment is required due to the different package footprint.

Alternative Substitute: SN74CBT16861DLR

The SN74CBT16861DLR offers functional equivalence in a wider 48-BSSOP package (0.295", 7.50mm width) supplied in Tape & Reel format. This variant is appropriate for high-volume production environments and applications where the larger package footprint is acceptable.

Voltage Supply Consideration: All Texas Instruments substitutes specify a minimum supply voltage of 4.5V, compared to the original FST16861MTDX minimum of 4V. Design circuits operating below 4.5V require retention of the original onsemi part or alternative sourcing strategies.

Product Status: The Last Time Buy status of all Texas Instruments substitutes indicates limited future availability. Long-term designs should evaluate alternative bus switch architectures or secure adequate inventory during the Last Time Buy window.

Frequently Asked Questions (FAQ)

Q: Can SN74CBT16861DGGR be used as a direct replacement for FST16861MTDX without PCB modifications?

A: Yes. The SN74CBT16861DGGR maintains identical 48-TSSOP package dimensions (0.240", 6.10mm width) and pinout compatibility, enabling direct PCB substitution without layout changes.

Q: What is the difference between the three Texas Instruments substitute parts?

A: The three substitutes differ in package format and physical dimensions. SN74CBT16861DGGR uses 48-TSSOP (0.240" width), SN74CBT16861DGVR uses 48-TVSOP (0.173" width), and SN74CBT16861DLR uses 48-BSSOP (0.295" width). All maintain identical electrical specifications and functional behavior.

Q: Are there any electrical differences between the FST16861MTDX and the Texas Instruments substitutes?

A: The primary electrical difference is the minimum supply voltage specification. The FST16861MTDX operates from 4V minimum, while all Texas Instruments substitutes specify 4.5V minimum. Both support the same maximum of 5.5V and identical operating temperature range of -40°C to 85°C.

Q: Do all substitute parts meet the same compliance requirements?

A: Yes. All substitute parts maintain ROHS3 compliance, MSL Level 1 rating, REACH unaffected status, and identical ECCN (EAR99) and HTSUS (8542.39.0001) classifications as the original FST16861MTDX.

Q: Which substitute part should be selected for new designs?

A: For new designs, SN74CBT16861DGGR is recommended as the primary choice due to direct package compatibility and established availability. Alternative packages (DGVR or DLR) should be selected only when specific design constraints (space or volume production) justify the additional layout or sourcing complexity.

Q: What is the significance of the Last Time Buy status on the Texas Instruments parts?

A: Last Time Buy status indicates that Texas Instruments will discontinue production after a specified date. Designs requiring long-term component availability should secure adequate inventory during the Last Time Buy window or evaluate alternative bus switch solutions.