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| PartNumber | FT121T | FT121T-U | FT121T-R |
| Description | USB Interface IC USB CONTROLLER W/SPI SLAVE IC | USB Interface IC USB CONTROLLER W/SPI SLAVE IC | |
| Manufacturer | - | FTDI, Future Technology Devices International Ltd | FTDI |
| Product Category | - | Interface - Controllers | Interface - Controllers |
| Series | - | FT121 | FT121 |
| Product | - | USB Peripheral Controllers | USB Peripheral Controllers |
| Type | - | Peripheral Controller | Peripheral Controller |
| Packaging | - | Tube Alternate Packaging | Digi-ReelR Alternate Packaging |
| Unit Weight | - | 0.006102 oz | 0.006102 oz |
| Mounting Style | - | SMD/SMT | SMD/SMT |
| Package Case | - | TSSOP-16 | TSSOP-16 |
| Operating Temperature | - | -40°C ~ 85°C | -40°C ~ 85°C |
| Function | - | Controller | Controller |
| Interface | - | SPI | SPI |
| Voltage Supply | - | 3.3V, 5V | 3.3V, 5V |
| Supplier Device Package | - | 16-TSSOP | 16-TSSOP |
| Speed | - | Full-Speed | High-Speed |
| Current Supply | - | 3.9mA | 3.9mA |
| Protocol | - | USB | USB |
| Standards | - | USB 2.0 | USB 2.0 |
| Data Rate | - | 2 Mb/s | 480 Mb/s |
| Standard | - | USB 2.0 | USB 2.0 |
| Maximum Operating Temperature | - | - | + 85 C |
| Minimum Operating Temperature | - | - | - 40 C |
| Operating Supply Voltage | - | - | 4 V to 5.5 V |
| Operating Supply Current | - | - | 3.9 mA |
| Interface Type | - | - | SPI USB |