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See Product Specifications
| Part Number: | SI4031-B1-FM | 
| Category: | RF/IF and RFID | 
| Subcategory: | RF Transmitters | 
| Manufacturer: | Silicon Labs | 
| Packaging: | Tube | 
| Product Status: | Not For New Designs | 
| Frequency: | 240MHz ~ 930MHz | 
| Applications: | General Purpose | 
| Modulation or Protocol: | FSK, GFSK, OOK | 
| Data Rate (Max): | 256kbps | 
| Power - Output: | 13dBm | 
| Current - Transmitting: | 30mA | 
| Data Interface: | PCB, Surface Mount | 
| Antenna Connector: | PCB, Surface Mount | 
| Memory Size: | - | 
| Features: | - | 
| Voltage - Supply: | 1.8V ~ 3.6V | 
| Operating Temperature: | -40°C ~ 85°C | 
| Mounting Type: | Surface Mount | 
| Package / Case: | 20-VFQFN Exposed Pad | 
| Supplier Device Package: | 20-QFN (4x4) |