SI4021-A1-FTR

RF Transmitter Overview

The SI4021-A1-FTR is a universal ISM band RF transceiver IC from Silicon Labs, operating within the frequency range of 430.24 MHz to 929.27 MHz. It supports FSK and OOK modulation protocols with a maximum data rate of 512 kbps and delivers an output power of 8 dBm. The device functions on a supply voltage range of 2.2 V to 5.4 V, drawing a transmission current of 24 mA. It is housed in a 16-TSSOP package and operates within a temperature range of -40°C to +85°C.

RF Transmitter Feature Summary

• Supports FSK and OOK modulation protocols for versatile wireless communication
• Operates across universal ISM bands including 433, 868, and 915 MHz regions
• Integrated high-output power capability of 8 dBm for extended range
• Low-power design suitable for battery-operated IoT applications

RF Transmitter Applications

• Wireless sensor networks
• Remote control systems
• Alarm systems
• Telemetry devices

RF Transmitter Procurement Notes

Verify component authenticity through official Silicon Labs channels or authorized distributors. Confirm package integrity and pin alignment against the 16-TSSOP specification. Check for End-of-Life status notifications as the Si4021 series has been subject to EOL announcements. Ensure compatibility with required ISM band frequencies for your specific regional deployment.

RF Transmitter Selection Notes

Select this component for applications requiring simple FSK/OOK modulation in the sub-1 GHz range. Consider the 8 dBm output power for moderate range requirements. Evaluate the 2.2 V to 5.4 V supply range for system power architecture compatibility. Verify that the 512 kbps data rate meets application throughput needs before finalizing selection.

RF Transmitter Part Context

The SI4021 belongs to the EZRadio family of low-power RF transceivers designed for simple, cost-effective wireless connectivity. It integrates a programmable radio core and baseband processor. This specific variant is optimized for universal ISM band operation, providing flexibility for global deployments without multiple part numbers.

RF Transmitter Replacement Considerations

Silicon Labs has announced End-of-Life (EOL) for the Si4021 series. Customers should evaluate alternative parts such as the Si442x series or newer EZRadioPRO devices for new designs. Existing production may continue using stock until depletion.