FSTU6800MTCX Bus Switch 10 x 1:1 Equivalent & Substitute Parts

Part Overview

The FSTU6800MTCX is a bus switch IC manufactured by onsemi, configured as a 10 x 1:1 multiplexer in a 24-TSSOP package. This component is classified as obsolete, making equivalent substitute parts necessary for new designs and ongoing production support. The functional architecture—a 10-channel, single-pole single-throw bus switch with unified control logic—remains consistent across qualified substitutes, enabling direct replacement based on electrical and mechanical parameter alignment.

Substiute Parts

FSTU6800MTCX

onsemiIn Stock: 795FSTU6800MTCX Datasheet

Current PartRFQ

SN74CBT6800CDGVR

Texas InstrumentsIn Stock: 888SN74CBT6800CDGVR Datasheet

SimilarRFQ

SN74CBT6800APWR

Texas InstrumentsIn Stock: 3150SN74CBT6800APWR Datasheet

Parametric EquivalentRFQ

SN74CBT6800CPWR

Texas InstrumentsIn Stock: 2186SN74CBT6800CPWR Datasheet

Parametric EquivalentRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the FSTU6800MTCX is determined by strict parameter matching across the following criteria:

Electrical Parameters (Must Match):

• Circuit configuration: 10 x 1:1
• Voltage supply range: 4V ~ 5.5V
• Operating temperature range: -40°C ~ 85°C
• Single supply architecture

Mechanical Parameters (Must Match):

• Surface mount technology
• 24-pin package footprint with 0.173" (4.40mm) width specification
• Pin-compatible package designation

Compliance & Regulatory (Must Match):

• REACH Unaffected status
• ECCN classification: EAR99
• Moisture sensitivity level: 1 (Unlimited)

The three qualified substitutes—SN74CBT6800CPWR, SN74CBT6800APWR, and SN74CBT6800CDGVR—satisfy all electrical and mechanical requirements. Differences in packaging format (Tape & Reel vs. Cut Tape) and product status do not affect functional equivalence but may influence procurement and supply chain considerations.

Parameter Comparison

Engineering Selection Recommendations

SN74CBT6800CPWR is the primary recommended substitute. This part carries Active product status, ensuring long-term availability and manufacturing support. It is ROHS3 compliant and supplied in Tape & Reel format, suitable for high-volume production environments. Electrical and mechanical parameters are fully aligned with the FSTU6800MTCX.

SN74CBT6800APWR is a secondary option with identical electrical and mechanical specifications. This part is designated Last Time Buy, indicating a defined end-of-life window. It is supplied in Cut Tape format, appropriate for lower-volume or prototype applications. ROHS3 compliance is confirmed.

SN74CBT6800CDGVR provides an alternative with Active product status and ROHS3 compliance. The package designation differs slightly (24-TFSOP vs. 24-TSSOP), though both maintain the same 0.173" (4.40mm) width and pin-compatible footprint. This part is supplied in Tape & Reel format.

All three substitutes satisfy the electrical operating envelope (4V ~ 5.5V supply, -40°C ~ 85°C temperature range) and maintain the 10 x 1:1 bus switch architecture. Selection should prioritize SN74CBT6800CPWR for new designs requiring extended product lifecycle support.

Frequently Asked Questions (FAQ)

Q: Can SN74CBT6800CPWR be used as a direct replacement for FSTU6800MTCX in existing designs?

A: Yes. Both parts share identical electrical specifications (10 x 1:1 bus switch, 4V ~ 5.5V supply, -40°C ~ 85°C operating range) and pin-compatible 24-TSSOP packaging. No circuit modifications are required.

Q: What is the difference between 24-TSSOP and 24-TFSOP packages?

A: Both designations refer to thin shrink small-outline packages with identical 0.173" (4.40mm) width and pin spacing. The packages are mechanically and electrically compatible for PCB assembly purposes.

Q: Why is SN74CBT6800APWR marked as Last Time Buy?

A: Last Time Buy status indicates that Texas Instruments has announced a defined end-of-life date for this part number. While currently available, procurement should transition to SN74CBT6800CPWR (Active status) for designs requiring extended production support.

Q: Are all three substitutes ROHS3 compliant?

A: Yes. SN74CBT6800CPWR, SN74CBT6800APWR, and SN74CBT6800CDGVR are all ROHS3 compliant, meeting current environmental and hazardous substance restrictions.

Q: Does packaging format (Tape & Reel vs. Cut Tape) affect electrical performance?

A: No. Packaging format is a supply and handling specification only. Electrical and functional performance is identical regardless of whether the part is supplied in Tape & Reel or Cut Tape format.

Q: What is the significance of MSL 1 (Unlimited) rating?

A: MSL 1 indicates unlimited shelf life under standard storage conditions. No moisture baking or special handling procedures are required prior to assembly, simplifying inventory management and reducing component preparation time.