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| PartNumber | SI4021-A1-FT1 | SI4021-A1-FT | SI4021-A1-FT1R |
| Description | RF Transmitter TX SubG | RF Transmitter TX SubG | RF Transmitter TX SubG |
| Manufacturer | Silicon Laboratories | Silicon Laboratories | Silicon Laboratories |
| Product Category | RF Transmitter | RF Transmitter | RF Transmitter |
| Type | Universal ISM Band | Universal ISM Band | Universal ISM Band |
| Operating Frequency | 430.24 MHz to 929.27 MHz | 430.24 MHz to 929.27 MHz | 430.24 MHz to 929.27 MHz |
| Operating Supply Voltage | 2.2 V to 5.4 V | 2.2 V to 5.4 V | 2.2 V to 5.4 V |
| Maximum Operating Temperature | + 85 C | + 85 C | + 85 C |
| Package / Case | TSSOP-16 | TSSOP-16 | TSSOP-16 |
| Mounting Style | SMD/SMT | SMD/SMT | SMD/SMT |
| Packaging | Tube | Tube | Reel |
| Supply Voltage Max | 5.4 V | 5.4 V | 5.4 V |
| Supply Voltage Min | 2.2 V | 2.2 V | 2.2 V |
| Output Power | 8 dBm | 8 dBm | 8 dBm |
| Series | Si4021 | Si4021 | Si4021 |
| Brand | Silicon Labs | Silicon Labs | Silicon Labs |
| Minimum Operating Temperature | - 40 C | - 40 C | - 40 C |
| Modulation Format | FSK, OOK | FSK, OOK | FSK, OOK |
| Operating Supply Current | 300 nA | 300 nA | 300 nA |
| Product Type | RF Transmitter | RF Transmitter | RF Transmitter |
| Factory Pack Quantity | 96 | 96 | 2000 |
| Subcategory | Wireless & RF Integrated Circuits | Wireless & RF Integrated Circuits | Wireless & RF Integrated Circuits |
| Supply Current Transmitting | 24 mA | 24 mA | 24 mA |
| RoHS | - | Y | - |
| Moisture Sensitive | - | Yes | - |
| Unit Weight | - | 0.002037 oz | - |