FSTU3384MTCX Equivalent & Substitute Parts

Part Overview

The FSTU3384MTCX is a bus switch logic IC manufactured by onsemi, featuring a 5 x 1:1 circuit configuration in a 24-TSSOP package. This component is classified as obsolete, making equivalent substitute parts necessary for ongoing design support and procurement. The part operates with single supply voltage between 4V and 5.5V across an operating temperature range of -40°C to 85°C. Substitute parts maintain functional equivalence through identical circuit topology, voltage specifications, and thermal operating ranges while offering active product status and improved availability.

Key Parameters

Parameter	Specification
Manufacturer Part Number	FSTU3384MTCX
Manufacturer	onsemi
Category	Logic
Type	Bus Switch
Circuit Configuration	5 x 1:1
Independent Circuits	2
Voltage Supply Source	Single Supply
Voltage - Supply Range	4V ~ 5.5V
Operating Temperature	-40°C ~ 85°C
Mounting Type	Surface Mount
Package / Case	24-TSSOP (0.173", 4.40mm Width)
Product Status	Obsolete
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitute parts for the FSTU3384MTCX are qualified based on the following critical parameters that determine functional and mechanical compatibility:

Functional Equivalence Criteria:

Circuit configuration: 5 x 1:1 topology
Independent circuits: 2
Voltage supply source: Single supply
Voltage supply range: 4.5V ~ 5.5V (encompasses original 4V ~ 5.5V specification)
Operating temperature range: -40°C ~ 85°C
Mounting type: Surface mount

Package Compatibility Criteria: Substitutes are grouped by package type. The original FSTU3384MTCX uses 24-TSSOP packaging. Substitute parts are available in three package variants: 24-TSSOP, 24-SSOP, and 24-TVSOP. Each package maintains the same pin count and electrical interface, with dimensional variations noted in the comparison table.

Manufacturer Basis: All substitute parts are manufactured by Texas Instruments under the 74CBT and 74CBTD series designations, representing active product lines with full RoHS3 compliance and REACH compliance status.

Parameter Comparison

Parameter	FSTU3384MTCX (onsemi)	SN74CBT3384CPWR (TI)	SN74CBT3384CDBQR (TI)	SN74CBT3384CDGVR (TI)	SN74CBTD3384CPWR (TI)	SN74CBTD3384CDBQR (TI)	SN74CBTD3384CDBR (TI)	SN74CBTD3384CDGVR (TI)	SN74CBTD3384CPW (TI)
Type	Bus Switch	Bus Switch	Bus Switch	Bus Switch	Bus Switch	Bus Switch	Bus Switch	Bus Switch	Bus Switch
Circuit Configuration	5 x 1:1	5 x 1:1	5 x 1:1	5 x 1:1	5 x 1:1	5 x 1:1	5 x 1:1	5 x 1:1	5 x 1:1
Independent Circuits	2	2	2	2	2	2	2	2	2
Voltage Supply Source	Single Supply	Single Supply	Single Supply	Single Supply	Single Supply	Single Supply	Single Supply	Single Supply	Single Supply
Voltage - Supply Range	4V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V	4.5V ~ 5.5V
Operating Temperature	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C	-40°C ~ 85°C
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount	Surface Mount
Package / Case	24-TSSOP (0.173", 4.40mm)	24-TSSOP (0.173", 4.40mm)	24-SSOP (0.154", 3.90mm)	24-TFSOP (0.173", 4.40mm)	24-TSSOP (0.173", 4.40mm)	24-SSOP (0.154", 3.90mm)	24-SSOP (0.209", 5.30mm)	24-TFSOP (0.173", 4.40mm)	24-TSSOP (0.173", 4.40mm)
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	Not specified	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	2 (1 Year)	1 (Unlimited)	1 (Unlimited)	2 (1 Year)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

Direct Package Match (24-TSSOP): For applications requiring identical package footprint to the FSTU3384MTCX, select from the following active alternatives:

SN74CBT3384CPWR (Tape & Reel packaging)
SN74CBTD3384CPWR (Tape & Reel packaging)
SN74CBTD3384CPW (Tube packaging)

These parts maintain the 24-TSSOP (0.173", 4.40mm width) package specification and offer MSL 1 moisture sensitivity rating, matching the original component's handling requirements.

Alternative Package Options: When PCB layout permits package variation, the following substitutes provide active product status with full compliance certifications:

24-SSOP variants (SN74CBT3384CDBQR, SN74CBTD3384CDBQR): Narrower 3.90mm width, MSL 2 rating
24-TVSOP variants (SN74CBT3384CDGVR, SN74CBTD3384CDGVR): 4.40mm width, MSL 1 rating
24-SSOP variant (SN74CBTD3384CDBR): 5.30mm width, MSL 1 rating

Compliance Advantage: All Texas Instruments substitute parts carry ROHS3 compliance and REACH unaffected status, providing regulatory advantage over the obsolete onsemi original part. The 74CBTD series represents the latest generation with enhanced specifications while maintaining full backward compatibility.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a different package type on my existing PCB? A: Package substitution requires PCB layout verification. While all substitute parts maintain identical pin count and electrical interface, physical dimensions vary. The 24-TSSOP variants (SN74CBT3384CPWR, SN74CBTD3384CPWR, SN74CBTD3384CPW) provide direct footprint compatibility with the original FSTU3384MTCX. Alternative packages (24-SSOP, 24-TVSOP) require PCB redesign and re-qualification.

Q: What is the difference between 74CBT and 74CBTD series? A: Both series maintain identical functional specifications for the 3384 bus switch configuration. The 74CBTD series represents the current generation with active product status and full manufacturing support. The 74CBT series remains active but represents an earlier generation. Both are fully compatible for the specified electrical and thermal operating ranges.

Q: Are there voltage supply differences between the original and substitutes? A: The original FSTU3384MTCX specifies 4V ~ 5.5V supply range. All Texas Instruments substitutes specify 4.5V ~ 5.5V. Applications operating below 4.5V require verification against the original part's lower voltage capability. For standard 5V logic applications, all substitutes operate within specification.

Q: What does MSL 1 versus MSL 2 mean for my procurement? A: MSL (Moisture Sensitivity Level) 1 parts have unlimited shelf life under controlled storage. MSL 2 parts require baking if exposed to moisture for more than one year. For long-term inventory, MSL 1 variants (SN74CBT3384CPWR, SN74CBTD3384CPWR, SN74CBTD3384CPW, SN74CBTD3384CDBR, SN74CBTD3384CDGVR) provide lower handling risk.

Q: Which substitute offers the best long-term availability? A: All Texas Instruments substitutes carry active product status. The 74CBTD series (SN74CBTD3384CPWR, SN74CBTD3384CPW, SN74CBTD3384CDBQR, SN74CBTD3384CDBR, SN74CBTD3384CDGVR) represents the current generation with full manufacturing commitment. For new designs, 74CBTD variants are recommended.

Q: Can I mix packaging types in the same production run? A: All substitute parts maintain identical electrical specifications and pin assignments. Packaging differences are physical only. Mixed packaging is permissible if your assembly process accommodates multiple package types. Verify with your manufacturing partner for any process constraints.

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