SI4421-A1-FT

RF Transceiver ICS Overview

The SI4421-A1-FT is a low-power, multi-channel FSK transceiver from Silicon Labs designed for ISM band applications. It operates within a frequency range of 430.24 MHz to 929.27 MHz and supports a maximum data rate of 256 kb/s. The device functions on a supply voltage between 2.2 V and 3.8 V, with typical receiving current at 13 mA and transmitting current at 24 mA. It delivers an output power of 7 dBm and achieves a sensitivity of -110 dBm. Communication is managed via an SPI interface, housed in a TSSOP-16 package suitable for surface mount installation. Operating temperatures span from -40°C to +85°C.

RF Transceiver ICS Feature Summary

• Single-chip architecture integrating transmitter and receiver functions for Sub-GHz wireless communication.
• Supports FSK modulation formats compliant with FCC and ETSI regulations for global ISM band usage.
• Low power consumption design optimized for battery-operated devices requiring extended operational life.

RF Transceiver ICS Applications

• Wireless sensor networks
• Remote control systems
• Security alarm systems

RF Transceiver ICS Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific suffix FT indicates tape and reel packaging if required for automated assembly processes. Check for recent discontinuance notifications as this series may be subject to end-of-life status. Ensure compatibility with existing PCB footprints and SPI interface configurations before procurement.

RF Transceiver ICS Selection Notes

Select this component for applications requiring reliable Sub-GHz communication with moderate data rates. Consider the 7 dBm output power and -110 dBm sensitivity for range requirements. Evaluate the 2.2 V to 3.8 V operating range against system power constraints. The TSSOP-16 package size should fit within the designated board area. Verify that the SPI interface aligns with the host microcontroller capabilities.

RF Transceiver ICS Part Context

The SI4421 belongs to Silicon Labs' ezradio family of universal ISM band transceivers. This series provides flexible solutions for various wireless protocols. The A1 variant typically denotes specific silicon revisions or performance characteristics. The FT suffix specifies the reel packaging format. This part integrates RF front-end and baseband processing into a single compact solution.

RF Transceiver ICS Replacement Considerations

Public documentation indicates the SI4421 series is not recommended for new designs. Potential substitutes include newer generations from the same manufacturer or compatible FSK transceivers with similar pinouts and electrical specifications. Verify regulatory compliance and interface compatibility when evaluating alternatives.