SI4020-I1-FT

RF Transmitter Overview

The SI4020-I1-FT is a single-chip, low-power, multi-channel FSK transmitter from Silicon Labs, designed for unlicensed use in the 315, 433, 868, and 915 MHz bands. It features EZRadio technology, requiring only an external crystal and bypass filtering. Key electrical parameters include a supply voltage of 2.2V to 5.4V, a maximum data rate of 256kbps, and an output power of 3dBm. The device operates within a temperature range of -40°C to 85°C and is housed in a compact 16-pin TSSOP package.

RF Transmitter Feature Summary

• Fully integrated RF solution with no production alignment required
• Fast settling, programmable, high-resolution PLL for stable modulation
• Direct loop antenna drive with automatic tuning circuit
• Low standby current of 0.3 µA with power-saving sleep mode

RF Transmitter Applications

• Remote control systems
• Home security and alarm systems
• Wireless keyboard and mouse peripherals

RF Transmitter Procurement Notes

Verify that the component matches the exact part number SI4020-I1-FT, including the specific suffix indicating tape and reel packaging. Confirm the manufacturer is Silicon Laboratories Inc. Check the datasheet revision date, as this component is not recommended for new designs; ensure compatibility with existing legacy designs before procurement.

RF Transmitter Selection Notes

Select this component for applications requiring FCC or ETSI conformance in unlicensed ISM bands. It is suitable for designs needing low BOM count and easy integration with microcontrollers via SPI. Consider alternatives like Si4022 or Si4031 if starting a new design, as this model is deprecated for future development.

RF Transmitter Part Context

The SI4020 belongs to Silicon Labs' EZRadio family of transmitters. It is designed to work in conjunction with receivers like the IA4320 to form complete wireless communication links. The series emphasizes low cost and high integration, reducing the need for external RF components beyond a crystal and simple filtering.

RF Transmitter Replacement Considerations

Silicon Labs explicitly recommends Si4022 or Si4031 as suggested alternatives for new designs. These parts offer updated features while maintaining similar functionality. Verify pinout and register compatibility when migrating from the SI4020 to these successor models.