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74FST3384DTR2 Bus Switch 5 x 1:1 Equivalent & Substitute Parts
Part Overview
The 74FST3384DTR2 is a bus switch 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 part operates with single supply voltage between 4V and 5.5V across an operating temperature range of -40°C to 85°C. Substitute parts must maintain functional equivalence through matching circuit topology, package compatibility, and electrical specifications.
Substiute Parts
Key Parameters
| Parameter | Specification |
|---|---|
| Type | Bus Switch |
| Circuit Configuration | 5 x 1:1 |
| Independent Circuits | 2 |
| Voltage Supply | Single Supply |
| Voltage Range | 4V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Surface Mount |
| Package / Case | 24-TSSOP (0.173", 4.40mm Width) |
| RoHS Status | RoHS non-compliant |
| Moisture Sensitivity Level | 1 (Unlimited) |
Substitute Part Grouping Explanation
Substitution for the 74FST3384DTR2 is determined by the following criteria:
Primary Substitution Parameters:
- Circuit configuration: 5 x 1:1 topology with 2 independent circuits
- Voltage supply range compatibility: Minimum 4.5V to 5.5V acceptable
- Operating temperature range: -40°C to 85°C
- Mounting type: Surface mount only
- Package type: 24-TSSOP, 24-SSOP, or 24-QSOP packages
Substitution Categories:
Direct Substitutes (24-TSSOP Package): Parts maintaining identical package footprint and pinout. SN74CBT3384APW, SN74CBT3384APWR, and SN74CBT3384CPW from Texas Instruments provide direct replacement capability with improved RoHS3 compliance.
Compatible Substitutes (24-SSOP Package): Parts with equivalent circuit function in 24-SSOP package format. SN74CBT3384ADBQR, SN74CBT3384ADBR, and SN74CBT3384CDBQR maintain functional equivalence with different package dimensions (0.154" width).
Compatible Substitutes (24-TVSOP Package): SN74CBT3384ADGVR and SN74CBT3384CDGVR provide functional equivalence in 24-TVSOP package format (0.173" width).
Cross-Manufacturer Substitutes: CBT3384PW,118 from NXP Semiconductors and PI5C3384QE from Diodes Incorporated offer functional equivalence with different package specifications and active product status.
Parameter Comparison
| Part Number | Manufacturer | Circuit | Voltage Range | Temp Range | Package | Package Width | Product Status | RoHS Status | MSL |
|---|---|---|---|---|---|---|---|---|---|
| 74FST3384DTR2 | onsemi | 5 x 1:1 | 4V ~ 5.5V | -40°C ~ 85°C | 24-TSSOP | 0.173" | Obsolete | RoHS non-compliant | 1 |
| SN74CBT3384APW | Texas Instruments | 5 x 1:1 | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-TSSOP | 0.173" | Last Time Buy | ROHS3 Compliant | 1 |
| SN74CBT3384APWR | Texas Instruments | 5 x 1:1 | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-TSSOP | 0.173" | Last Time Buy | ROHS3 Compliant | 1 |
| SN74CBT3384CPW | Texas Instruments | 5 x 1:1 | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-TSSOP | 0.173" | Active | ROHS3 Compliant | 1 |
| CBT3384PW,118 | NXP Semiconductors | 5 x 1:1 | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-TSSOP | 0.173" | Active | Not specified | 1 |
| PI5C3384QE | Diodes Incorporated | 5 x 1:1 | 4.75V ~ 5.25V | -40°C ~ 85°C | 24-QSOP | 0.154" | Last Time Buy | ROHS3 Compliant | 1 |
| SN74CBT3384ADBQR | Texas Instruments | 5 x 1:1 | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-SSOP | 0.154" | Last Time Buy | ROHS3 Compliant | 2 |
| SN74CBT3384ADBR | Texas Instruments | 5 x 1:1 | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-SSOP | 0.209" | Last Time Buy | ROHS3 Compliant | 1 |
| SN74CBT3384ADGVR | Texas Instruments | 5 x 1:1 | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-TVSOP | 0.173" | Last Time Buy | ROHS3 Compliant | 1 |
| SN74CBT3384CDBQR | Texas Instruments | 5 x 1:1 | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-SSOP | 0.154" | Active | ROHS3 Compliant | 2 |
| SN74CBT3384CDGVR | Texas Instruments | 5 x 1:1 | 4.5V ~ 5.5V | -40°C ~ 85°C | 24-TVSOP | 0.173" | Active | ROHS3 Compliant | 1 |
Engineering Selection Recommendations
For Direct Replacement (Identical Footprint): SN74CBT3384CPW is the preferred choice, offering active product status with ROHS3 compliance and identical 24-TSSOP package dimensions. This part eliminates obsolescence risk while maintaining PCB layout compatibility.
For RoHS3 Compliance Requirement: All Texas Instruments SN74CBT3384 variants and NXP CBT3384PW,118 meet ROHS3 compliance standards. The onsemi 74FST3384DTR2 does not comply with current RoHS regulations.
For Active Product Status: SN74CBT3384CPW, CBT3384PW,118, SN74CBT3384CDBQR, and SN74CBT3384CDGVR maintain active product status, ensuring long-term availability and supply chain stability.
For Package Flexibility: When PCB layout permits, 24-SSOP variants (SN74CBT3384CDBQR) or 24-TVSOP variants (SN74CBT3384CDGVR) provide alternative footprints with active status and full compliance.
For Moisture Sensitivity Consideration: Parts with MSL 1 (Unlimited) provide superior handling flexibility compared to MSL 2 (1 Year) variants. SN74CBT3384CPW, SN74CBT3384ADBR, and SN74CBT3384CDGVR offer MSL 1 rating.
Frequently Asked Questions (FAQ)
Q: Can SN74CBT3384APW directly replace 74FST3384DTR2 on existing PCBs? A: Yes. Both parts use identical 24-TSSOP package with 0.173" width and matching pinout. Electrical specifications are compatible within the overlapping voltage range of 4.5V to 5.5V.
Q: What is the voltage compatibility difference between 74FST3384DTR2 and SN74CBT3384 variants? A: The 74FST3384DTR2 operates at 4V minimum, while Texas Instruments SN74CBT3384 parts specify 4.5V minimum. Both support 5.5V maximum. Designs operating below 4.5V require the original part or equivalent onsemi solution.
Q: Are 24-SSOP package variants (SN74CBT3384ADBQR, SN74CBT3384CDBQR) compatible with 24-TSSOP designs? A: No. While both are surface mount packages, 24-SSOP has different pin spacing and dimensions (0.154" or 0.209" width versus 0.173" for TSSOP). PCB layout redesign is required for package conversion.
Q: Which substitute offers the best long-term availability? A: SN74CBT3384CPW from Texas Instruments provides active product status with ROHS3 compliance and identical package, ensuring sustained availability and regulatory compliance.
Q: What is the significance of MSL rating differences? A: MSL 1 (Unlimited) parts have no moisture absorption restrictions and indefinite shelf life. MSL 2 (1 Year) parts require controlled storage and have one-year shelf life limits. MSL 1 parts offer superior handling flexibility.
Q: Can PI5C3384QE from Diodes Incorporated substitute for the 74FST3384DTR2? A: Functionally yes, but with package differences. PI5C3384QE uses 24-QSOP package (0.154" width) versus 24-TSSOP (0.173" width). Voltage range is narrower (4.75V to 5.25V). PCB redesign is required.
Q: What compliance certifications should be verified for new designs? A: ROHS3 compliance is mandatory for current designs. All Texas Instruments variants and NXP CBT3384PW,118 meet this requirement. The original 74FST3384DTR2 does not comply and should not be used in new designs.
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