74FST3861DWR2 Equivalent & Substitute Parts

Part Overview

The 74FST3861DWR2 is a bus switch logic IC manufactured by onsemi, configured as a 10 x 1:1 multiplexer in a 24-SOIC surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and production continuity. The part operates across a 4V to 5.5V supply range with an operating temperature range of -40°C to 85°C, serving applications requiring high-speed bus switching functionality.

Substiute Parts

74FST3861DWR2

onsemiIn Stock: 335874FST3861DWR2 Datasheet

Current PartRFQ

SN74CBT3861DW

Texas InstrumentsIn Stock: 2218SN74CBT3861DW Datasheet

DirectRFQ

SN74CBT3861DWR

Texas InstrumentsIn Stock: 3394SN74CBT3861DWR Datasheet

DirectRFQ

SN74CBT6800CDWR

Texas InstrumentsIn Stock: 749SN74CBT6800CDWR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the 74FST3861DWR2 is determined by the following critical parameters:

• Circuit configuration: 10 x 1:1 bus switch topology
• Package type: 24-SOIC form factor with identical 0.295" (7.50mm) width
• Voltage supply range: Minimum 4V to 5.5V maximum compatibility
• Operating temperature range: -40°C to 85°C
• Mounting type: Surface mount technology
• Independent circuits: Single circuit configuration

The substitute parts identified below maintain functional equivalence through matching these core electrical and mechanical specifications. Differences in manufacturer, product status, and compliance certifications are noted but do not affect electrical interchangeability within the specified parameter envelope.

Parameter Comparison

Engineering Selection Recommendations

SN74CBT3861DWR (Texas Instruments) is the primary direct substitute. This part maintains identical electrical specifications within the 4.5V to 5.5V supply range, matching the original 74FST3861DWR2 circuit configuration and package footprint. The part carries Last Time Buy status with ROHS3 compliance, providing regulatory alignment for new designs while maintaining functional equivalence.

SN74CBT3861DW (Texas Instruments) offers equivalent functionality in tube packaging format. This variant is suitable for applications where tape and reel packaging is not required. Last Time Buy status indicates limited future availability.

SN74CBT6800CDWR (Texas Instruments) is a parametric equivalent with active product status, representing the longest-term availability option. This part extends the lower voltage supply limit to 4V, matching the original 74FST3861DWR2 specification. Active status ensures continued manufacturing and supply chain support. ROHS3 compliance is maintained.

For new designs requiring long-term component availability and regulatory compliance, SN74CBT6800CDWR is the recommended selection. For direct replacement in existing designs, SN74CBT3861DWR provides the closest functional match with Last Time Buy status.

Frequently Asked Questions (FAQ)

Q: Can SN74CBT3861DWR directly replace 74FST3861DWR2 on existing PCBs?

A: Yes. Both parts use identical 24-SOIC packaging with matching pin assignments, circuit configuration (10 x 1:1), and operating temperature range (-40°C to 85°C). The footprint and pinout are electrically compatible.

Q: What is the voltage supply difference between SN74CBT3861DWR and 74FST3861DWR2?

A: The original 74FST3861DWR2 operates at 4V to 5.5V. SN74CBT3861DWR operates at 4.5V to 5.5V. Applications operating at 4V to 4.5V require SN74CBT6800CDWR, which maintains the full 4V to 5.5V range.

Q: Why is SN74CBT6800CDWR recommended for new designs?

A: SN74CBT6800CDWR carries Active product status, ensuring continued manufacturing and supply availability. It maintains the full 4V to 5.5V voltage range and includes ROHS3 compliance, supporting long-term production requirements.

Q: Are there packaging format differences between the substitute parts?

A: SN74CBT3861DW is supplied in tube packaging, while SN74CBT3861DWR and SN74CBT6800CDWR are supplied in tape and reel format. The electrical specifications and 24-SOIC package dimensions remain identical across all variants.

Q: What is the significance of Last Time Buy status?

A: Last Time Buy indicates the manufacturer has announced end-of-life for the product line. Existing inventory remains available, but no new production is planned. For applications requiring extended component availability, transition to Active status parts such as SN74CBT6800CDWR.

Q: Are all substitute parts RoHS compliant?

A: The original 74FST3861DWR2 is RoHS non-compliant. All Texas Instruments substitutes (SN74CBT3861DW, SN74CBT3861DWR, SN74CBT6800CDWR) are ROHS3 compliant, supporting modern regulatory requirements.