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FST3384QSCX Equivalent & Substitute Parts
Part Overview
The FST3384QSCX is a bus switch logic IC manufactured by onsemi, featuring a 5 x 1:1 circuit configuration in a 24-QSOP package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The FST3384QSCX 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 | FST3384QSCX Specification |
|---|---|
| Type | Bus Switch |
| Circuit Configuration | 5 x 1:1 |
| Independent Circuits | 2 |
| Voltage Supply | Single Supply, 4V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Surface Mount |
| Package / Case | 24-SSOP (0.154", 3.90mm Width) |
| Supplier Device Package | 24-QSOP |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| REACH Status | REACH Unaffected |
| ECCN | EAR99 |
Substitute Part Grouping Explanation
Substitution of the FST3384QSCX is determined by strict equivalence in the following parameters: bus switch type with 5 x 1:1 circuit configuration, 2 independent circuits, single supply voltage operation, operating temperature range of -40°C to 85°C, and surface mount technology. Package compatibility is evaluated based on physical dimensions and pin count (24-pin packages). Voltage supply ranges must overlap or be compatible with the original specification (4V ~ 5.5V). Moisture sensitivity level and regulatory compliance (REACH, ECCN) are secondary considerations for long-term reliability and supply chain compliance.
Parameter Comparison
| Part Number | Manufacturer | Circuit Config | Voltage Supply | Operating Temp | Package Type | Package Width | Product Status | RoHS Status | MSL |
|---|---|---|---|---|---|---|---|---|---|
| FST3384QSCX | onsemi | 5 x 1:1 | 4V ~ 5.5V | -40°C ~ 85°C | 24-QSOP | 3.90mm | Obsolete | Not Specified | 1 |
| SN74CBT3384ADBQR | Texas Instruments | 5 x 1:1 | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-SSOP | 3.90mm | Last Time Buy | ROHS3 Compliant | 2 |
| CBT3384PW,118 | NXP Semiconductors | 5 x 1:1 | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-TSSOP | 4.40mm | Active | Not Specified | 1 |
| PI5C3384QE | Diodes Incorporated | 5 x 1:1 | 4.75V ~ 5.25V | -40°C ~ 85°C | 24-QSOP | 3.90mm | Last Time Buy | ROHS3 Compliant | 1 |
| QS3384QG | Renesas Electronics | 5 x 1:1 | 4.75V ~ 5.25V | -40°C ~ 85°C | 24-QSOP | 3.90mm | Active | ROHS3 Compliant | 1 |
| QS3384QG8 | Renesas Electronics | 5 x 1:1 | 4.75V ~ 5.25V | -40°C ~ 85°C | 24-QSOP | 3.90mm | Active | ROHS3 Compliant | 1 |
| SN74CBT3384ADBR | Texas Instruments | 5 x 1:1 | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-SSOP | 5.30mm | Last Time Buy | ROHS3 Compliant | 1 |
| SN74CBT3384ADGVR | Texas Instruments | 5 x 1:1 | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-TVSOP | 4.40mm | Last Time Buy | ROHS3 Compliant | 1 |
| SN74CBT3384CDBQR | Texas Instruments | 5 x 1:1 | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-SSOP | 3.90mm | Active | ROHS3 Compliant | 2 |
| SN74CBT3384CDGVR | Texas Instruments | 5 x 1:1 | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-TVSOP | 4.40mm | Active | ROHS3 Compliant | 1 |
| SN74CBT3384CPW | Texas Instruments | 5 x 1:1 | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-TSSOP | 4.40mm | Active | ROHS3 Compliant | 1 |
Engineering Selection Recommendations
For direct replacement of the FST3384QSCX in existing designs, SN74CBT3384CDBQR (Texas Instruments) and SN74CBT3384CDGVR (Texas Instruments) are preferred due to active product status and ROHS3 compliance. Both maintain the 5 x 1:1 circuit configuration, -40°C to 85°C operating temperature, and compatible voltage supply range (4.5V ~ 5.5V).
For new designs requiring long-term availability, QS3384QG and QS3384QG8 (Renesas Electronics) offer active product status with ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1). These parts maintain identical circuit configuration and operating temperature specifications with a slightly narrower voltage supply window (4.75V ~ 5.25V).
The NXP CBT3384PW,118 provides an active alternative with compatible electrical specifications but features a wider 24-TSSOP package (4.40mm width) compared to the original 3.90mm width, requiring PCB layout verification.
Parts designated as Last Time Buy (SN74CBT3384ADBQR, PI5C3384QE, SN74CBT3384ADBR, SN74CBT3384ADGVR) remain functionally equivalent but face eventual discontinuation and should be considered only for legacy system maintenance.
Frequently Asked Questions (FAQ)
Q: Can SN74CBT3384CDBQR directly replace FST3384QSCX on the PCB?
A: Yes, with package verification. Both use 24-SSOP packages with 3.90mm width and identical pin count. Electrical specifications are compatible: 5 x 1:1 circuit, -40°C to 85°C operation, and overlapping voltage supply ranges (4.5V ~ 5.5V vs. 4V ~ 5.5V).
Q: What is the difference between 24-QSOP, 24-SSOP, and 24-TSSOP packages?
A: These are different package designations for 24-pin surface mount devices. QSOP and SSOP refer to shrink small outline packages with 3.90mm width, while TSSOP indicates a thin shrink small outline package with 4.40mm width. Physical dimensions must match PCB footprints for direct substitution.
Q: Are Renesas QS3384QG and QS3384QG8 interchangeable?
A: Both parts share identical electrical specifications (5 x 1:1 circuit, 4.75V ~ 5.25V supply, -40°C to 85°C operation) and package type (24-QSOP). The QG8 designation indicates a specific tape and reel configuration variant. Electrical performance is equivalent.
Q: Why do some substitutes have narrower voltage supply ranges?
A: Voltage supply specifications reflect manufacturer test and qualification parameters. PI5C3384QE and Renesas parts specify 4.75V ~ 5.25V, which is a subset of the original 4V ~ 5.5V range. This narrower range remains compatible with standard 5V supply systems but may not support extended low-voltage applications below 4.75V.
Q: Which substitute offers the best long-term availability?
A: QS3384QG and QS3384QG8 (Renesas Electronics) carry Active product status, indicating ongoing production and support. Texas Instruments SN74CBT3384CDBQR and SN74CBT3384CDGVR also maintain Active status. Parts marked Last Time Buy will eventually reach end-of-life.
Q: Is MSL (Moisture Sensitivity Level) important for my application?
A: MSL rating affects storage and handling requirements. MSL 1 (unlimited shelf life) is preferable for inventory management. MSL 2 (1-year shelf life) requires controlled storage conditions. For high-volume or long-term inventory, MSL 1 parts are recommended.
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