SI4055-B1A-FMR

RF Transmitter Overview

The SI4055-B1A-FMR is a sub-GHz RF transmitter IC from Silicon Labs' EZRadio series. It supports FSK and OOK modulation formats with a maximum data rate of 500kbps. The device operates within frequency bands of 284MHz to 960MHz and delivers a maximum output power of 13dBm. It functions on a supply voltage range of 1.8V to 3.6V, drawing 18mA during transmission. The component is housed in a 20-QFN (3x3) package and is rated for operation between -40°C and 85°C.

RF Transmitter Feature Summary

• Transmits signals using FSK or OOK modulation schemes
• Operates across multiple sub-GHz ISM frequency bands
• Integrates an SPI interface for digital control

RF Transmitter Applications

• Wireless remote control systems
• Industrial telemetry monitoring
• Low-power sensor network nodes

RF Transmitter Procurement Notes

Verify the specific suffix 'FMR' against the manufacturer's official documentation to confirm tape-and-reel packaging status. Confirm current lifecycle status as End-of-Life notifications have been issued for related variants. Ensure compatibility with existing PCB footprints and SPI pin configurations before procurement.

RF Transmitter Selection Notes

Select this component when only transmission capability is required for sub-GHz applications. Compare against the Si4355 receiver-only variant if bidirectional communication is needed. Evaluate the Si4455 transceiver option for designs requiring both transmit and receive functions within the same package.

RF Transmitter Part Context

This part belongs to the Si4x55 family, which includes dedicated receivers like the Si4355 and combined transceivers like the Si4455. All devices share a common architecture but differ in functional blocks. The Si4055 specifically omits the receiver chain to optimize cost and power for uplink-only scenarios.

RF Transmitter Replacement Considerations

Public confirmed substitute part numbers are not available due to the End-of-Life status of this product line. Designers should consider migrating to newer generation EZRadio/PRO devices that offer updated features and availability.