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FST3384MTCX Equivalent & Substitute Parts
Part Overview
The FST3384MTCX 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 and substitute parts necessary for ongoing design support and procurement. The FST3384MTCX operates with single supply voltage between 4V and 5.5V across an operating temperature range of -40°C to 85°C, serving applications requiring multi-channel bus switching functionality.
Substiute Parts
Key Parameters
| Parameter | FST3384MTCX |
|---|---|
| Manufacturer | onsemi |
| Type | Bus Switch |
| Circuit Configuration | 5 x 1:1 |
| Independent Circuits | 2 |
| Voltage Supply | 4V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C |
| Package Type | 24-TSSOP (0.173", 4.40mm Width) |
| Mounting Type | Surface Mount |
| Product Status | Obsolete |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the FST3384MTCX is determined by the following critical parameters: bus switch circuit configuration (5 x 1:1), independent circuit count (2), voltage supply range compatibility, operating temperature range (-40°C to 85°C), and package type. Parts are grouped into two categories:
Direct Substitutes (Identical Package - 24-TSSOP): Parts maintaining the exact 24-TSSOP package footprint with compatible voltage supply and temperature specifications. These include SN74CBT3384APW, SN74CBT3384APWR, and SN74CBT3384CPW from Texas Instruments, and CBT3384PW,118 from NXP Semiconductors. These parts are pin-compatible and require no PCB layout modifications.
Functional Equivalents (Alternative Packages): Parts with identical circuit configuration and electrical specifications but different package types. These include PI5C3384QE (24-QSOP), SN74CBT3384ADBR (24-SSOP), SN74CBT3384ADGVR (24-TVSOP), SN74CBT3384CDBQR (24-SSOP), and SN74CBT3384CDGVR (24-TVSOP). These require PCB layout redesign due to different footprints but maintain functional compatibility.
Parameter Comparison
| Part Number | Manufacturer | Circuit Config | Voltage Supply | Operating Temp | Package Type | Product Status | RoHS Status | MSL |
|---|---|---|---|---|---|---|---|---|
| FST3384MTCX | onsemi | 5 x 1:1 | 4V ~ 5.5V | -40°C ~ 85°C | 24-TSSOP | Obsolete | — | 1 |
| SN74CBT3384APW | Texas Instruments | 5 x 1:1 | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-TSSOP | Last Time Buy | ROHS3 Compliant | 1 |
| SN74CBT3384APWR | Texas Instruments | 5 x 1:1 | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-TSSOP | Last Time Buy | ROHS3 Compliant | 1 |
| CBT3384PW,118 | NXP Semiconductors | 5 x 1:1 | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-TSSOP | Active | — | 1 |
| PI5C3384QE | Diodes Incorporated | 5 x 1:1 | 4.75V ~ 5.25V | -40°C ~ 85°C | 24-QSOP | Last Time Buy | ROHS3 Compliant | 1 |
| SN74CBT3384ADBR | Texas Instruments | 5 x 1:1 | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-SSOP | Last Time Buy | ROHS3 Compliant | 1 |
| SN74CBT3384ADGVR | Texas Instruments | 5 x 1:1 | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-TVSOP | Last Time Buy | ROHS3 Compliant | 1 |
| SN74CBT3384CDBQR | Texas Instruments | 5 x 1:1 | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-SSOP | Active | ROHS3 Compliant | 2 |
| SN74CBT3384CDGVR | Texas Instruments | 5 x 1:1 | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-TVSOP | Active | ROHS3 Compliant | 1 |
| SN74CBT3384CPW | Texas Instruments | 5 x 1:1 | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-TSSOP | Active | ROHS3 Compliant | 1 |
| SN74CBT3384CPWR | Texas Instruments | 5 x 1:1 | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-TSSOP | Active | ROHS3 Compliant | 1 |
Engineering Selection Recommendations
For direct replacement without PCB redesign, select from Texas Instruments SN74CBT3384 series parts in 24-TSSOP packaging. SN74CBT3384CPWR and SN74CBT3384CPW are preferred due to active product status and ROHS3 compliance. Both maintain the identical 24-TSSOP footprint and support the full voltage supply range of 4.5V to 5.5V.
For new designs or applications permitting PCB layout modifications, SN74CBT3384CDBQR and SN74CBT3384CDGVR offer active product status with ROHS3 compliance in alternative packages. CBT3384PW,118 from NXP Semiconductors provides an active alternative in 24-TSSOP packaging.
Parts with Last Time Buy status (SN74CBT3384APW, SN74CBT3384APWR, SN74CBT3384ADBR, SN74CBT3384ADGVR, PI5C3384QE) remain functionally equivalent but should be evaluated for long-term supply chain considerations.
Note the voltage supply range difference: FST3384MTCX supports 4V minimum, while most Texas Instruments and NXP alternatives specify 4.5V minimum. PI5C3384QE specifies a narrower range of 4.75V to 5.25V. Verify system voltage specifications before selection.
Frequently Asked Questions (FAQ)
Q: Can SN74CBT3384CPWR be used as a direct replacement for FST3384MTCX without PCB changes?
A: Yes. SN74CBT3384CPWR maintains identical 24-TSSOP package dimensions, pin configuration, and functional circuit topology (5 x 1:1 bus switch). No PCB layout modifications are required. Verify that your system voltage operates within the 4.5V to 5.5V range, as this part does not support the 4V minimum specified for FST3384MTCX.
Q: What is the difference between 24-TSSOP, 24-SSOP, and 24-QSOP packages?
A: These are distinct surface-mount package types with different physical dimensions and pin spacing. 24-TSSOP (0.173" width) and 24-SSOP (0.154" or 0.209" width) have different footprints and cannot be interchanged without PCB redesign. 24-QSOP is a variant with different pitch specifications. Package selection depends on available PCB real estate and manufacturing capabilities.
Q: Why do some parts show Last Time Buy status?
A: Last Time Buy status indicates the manufacturer has announced end-of-life for that part number. Existing inventory may be available, but future procurement will not be possible. For long-term applications, prioritize parts with Active status such as SN74CBT3384CPWR, SN74CBT3384CPW, CBT3384PW,118, SN74CBT3384CDBQR, or SN74CBT3384CDGVR.
Q: What does Moisture Sensitivity Level (MSL) mean?
A: MSL indicates the maximum time a component can be exposed to ambient moisture before soldering. MSL 1 (Unlimited) allows indefinite storage without moisture control. MSL 2 (1 Year) requires moisture control measures. Most substitutes carry MSL 1, with SN74CBT3384CDBQR as the exception at MSL 2. This affects storage and handling procedures.
Q: Is PI5C3384QE compatible with my design using FST3384MTCX?
A: PI5C3384QE provides functional equivalence with identical circuit configuration and operating temperature range. However, it uses 24-QSOP packaging instead of 24-TSSOP, requiring PCB redesign. Additionally, its voltage supply range (4.75V to 5.25V) is narrower than FST3384MTCX (4V to 5.5V). Confirm your system voltage falls within 4.75V to 5.25V before selection.
Q: What is the difference between tube and tape & reel packaging?
A: Tube packaging contains loose components in a plastic tube, suitable for manual assembly or small-volume production. Tape & Reel (TR) packaging places components on a continuous tape for automated pick-and-place assembly. Selection depends on manufacturing process and volume requirements. Both formats contain identical components.
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