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FST3245QSC Equivalent & Substitute Parts
Part Overview
The FST3245QSC is an 8 x 1:1 bus switch logic IC manufactured by onsemi in a 20-QSOP surface mount package. This component is classified as obsolete, making equivalent and substitute parts necessary for ongoing design support and procurement. The FST3245QSC operates with a 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 in bus switching topology while accommodating available packaging and product status variations.
Substiute Parts
Key Parameters
| Parameter | FST3245QSC |
|---|---|
| Type | Bus Switch |
| Circuit Configuration | 8 x 1:1 |
| Independent Circuits | 1 |
| Voltage Supply Source | Single Supply |
| Voltage - Supply Range | 4V ~ 5.5V |
| Operating Temperature | -40°C ~ 85°C |
| Mounting Type | Surface Mount |
| Package / Case | 20-LSSOP (0.154", 3.90mm Width) |
| Moisture Sensitivity Level (MSL) | 1 (Unlimited) |
| Product Status | Obsolete |
Substitute Part Grouping Explanation
Substitution for the FST3245QSC is determined by the following critical parameters:
- Bus switch topology: 8 x 1:1 configuration
- Single supply voltage operation: 4V ~ 5.5V range (or compatible subset)
- Operating temperature range: -40°C ~ 85°C
- Surface mount technology
- Package compatibility: 20-pin variants (QSOP, SSOP, TSSOP, TVSOP)
Substitute parts are grouped by package type and manufacturer. All listed substitutes maintain the 8 x 1:1 bus switch function and operate within compatible voltage and temperature specifications. Package variations (QSOP, SSOP, TSSOP, TVSOP) are mechanically distinct but functionally equivalent for circuit design purposes. Voltage supply ranges may vary slightly between manufacturers; parts with 4.75V ~ 5.25V ratings are compatible with the 4V ~ 5.5V specification through overlap in the 4.75V ~ 5.5V window.
Parameter Comparison
| Part Number | Manufacturer | Circuit | Voltage Supply | Operating Temp | Package / Case | Product Status | MSL |
|---|---|---|---|---|---|---|---|
| FST3245QSC | onsemi | 8 x 1:1 | 4V ~ 5.5V | -40°C ~ 85°C | 20-LSSOP (0.154", 3.90mm) | Obsolete | 1 |
| PI5C3245LE | Diodes Incorporated | 8 x 1:1 | 4.75V ~ 5.25V | -40°C ~ 85°C | 20-TSSOP (0.173", 4.40mm) | Last Time Buy | 1 |
| PI5C3245LEX | Diodes Incorporated | 8 x 1:1 | 4.75V ~ 5.25V | -40°C ~ 85°C | 20-TSSOP (0.173", 4.40mm) | Last Time Buy | 1 |
| PI5C3245QEX | Diodes Incorporated | 8 x 1:1 | 4.75V ~ 5.25V | -40°C ~ 85°C | 20-SSOP (0.154", 3.90mm) | Last Time Buy | 1 |
| SN74CBT3245ADBQR | Texas Instruments | 8 x 1:1 | 4V ~ 5.5V | -40°C ~ 85°C | 20-SSOP (0.154", 3.90mm) | Last Time Buy | 2 |
| SN74CBT3245ADBR | Texas Instruments | 8 x 1:1 | 4V ~ 5.5V | -40°C ~ 85°C | 20-SSOP (0.209", 5.30mm) | Last Time Buy | 1 |
| SN74CBT3245ADGVR | Texas Instruments | 8 x 1:1 | 4V ~ 5.5V | -40°C ~ 85°C | 20-TFSOP (0.173", 4.40mm) | Last Time Buy | 1 |
| SN74CBT3245CDBQR | Texas Instruments | 8 x 1:1 | 4V ~ 5.5V | -40°C ~ 85°C | 20-SSOP (0.154", 3.90mm) | Active | 2 |
| SN74CBT3245CDBR | Texas Instruments | 8 x 1:1 | 4V ~ 5.5V | -40°C ~ 85°C | 20-SSOP (0.209", 5.30mm) | Active | 1 |
| SN74CBT3245CDGVR | Texas Instruments | 8 x 1:1 | 4V ~ 5.5V | -40°C ~ 85°C | 20-TFSOP (0.173", 4.40mm) | Active | 1 |
| SN74CBT3245CPW | Texas Instruments | 8 x 1:1 | 4V ~ 5.5V | -40°C ~ 85°C | 20-TSSOP (0.173", 4.40mm) | Active | 1 |
Engineering Selection Recommendations
For new designs and ongoing procurement, Texas Instruments SN74CBT3245 series parts with Active product status are preferred. The SN74CBT3245CDBQR and SN74CBT3245CDGVR offer the best long-term availability and support. These parts maintain full voltage and temperature specification compatibility with the FST3245QSC while providing active product lifecycle status.
For applications requiring exact package matching to the original 20-LSSOP (0.154", 3.90mm width) footprint, the PI5C3245QEX provides functional equivalence with ROHS3 compliance, though it carries Last Time Buy status. The SN74CBT3245ADBQR also matches the 0.154" width specification with Active status alternatives available in the SN74CBT3245CDBQR.
Diodes Incorporated PI5C3245 series parts (PI5C3245LE, PI5C3245LEX, PI5C3245QEX) are suitable substitutes with ROHS3 compliance. These parts operate within a narrower voltage range (4.75V ~ 5.25V) that overlaps with the FST3245QSC specification in the 4.75V ~ 5.5V window, making them compatible for most applications operating at nominal 5V supply levels.
All substitute parts maintain MSL ratings of 1 or 2, indicating standard moisture sensitivity handling requirements. Parts with MSL 1 (Unlimited) offer superior shelf-life characteristics compared to MSL 2 (1 Year) variants.
Frequently Asked Questions (FAQ)
Q: Can I directly replace FST3245QSC with any of these substitute parts?
A: Direct replacement depends on package footprint compatibility. The FST3245QSC uses a 20-LSSOP package (0.154", 3.90mm width). Pin-compatible substitutes with matching footprints include PI5C3245QEX (20-SSOP, 0.154" width) and SN74CBT3245ADBQR (20-SSOP, 0.154" width). Other packages require PCB layout modification.
Q: What is the difference between the Diodes Incorporated and Texas Instruments options?
A: Both manufacturers provide 8 x 1:1 bus switch functionality with compatible electrical specifications. Texas Instruments SN74CBT3245 series offers Active product status for long-term availability. Diodes Incorporated PI5C3245 series carries Last Time Buy status. Voltage supply ranges differ slightly: Texas Instruments supports 4V ~ 5.5V; Diodes Incorporated supports 4.75V ~ 5.25V.
Q: Does the package width difference matter?
A: Package width affects PCB footprint and land pattern design. The 0.154" width (SSOP, QSOP) and 0.173" width (TSSOP, TFSOP) packages have different pin pitch and body dimensions. Substitution requires either matching the original footprint or redesigning the PCB layout. Electrical function remains identical across all package variants.
Q: Are all these parts RoHS compliant?
A: Texas Instruments SN74CBT3245 series parts are ROHS3 compliant. Diodes Incorporated PI5C3245 series parts are ROHS3 compliant. The original FST3245QSC does not specify RoHS status in the provided data.
Q: What does "Last Time Buy" and "Active" product status mean?
A: Active status indicates the manufacturer continues production and supports the part for new designs. Last Time Buy indicates the manufacturer has announced end-of-life; existing inventory is available but no new production is planned. Obsolete status means the part is no longer manufactured or supported.
Q: Can I use parts with different voltage supply ranges interchangeably?
A: The FST3245QSC operates at 4V ~ 5.5V. Diodes Incorporated parts operate at 4.75V ~ 5.25V. These ranges overlap from 4.75V to 5.25V. For applications operating at nominal 5V supply, both are compatible. For applications requiring operation below 4.75V or above 5.25V, only Texas Instruments SN74CBT3245 series (4V ~ 5.5V) is suitable.
Q: What is MSL and why does it matter?
A: Moisture Sensitivity Level (MSL) indicates how sensitive the component is to moisture during storage and handling. MSL 1 (Unlimited) parts have no shelf-life restrictions. MSL 2 (1 Year) parts must be used within one year of the manufacturing date if stored in standard conditions. For long-term inventory, MSL 1 parts are preferred.
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