Sub-1 GHz RF front-end for ISM-band links
The Texas Instruments CC1101IRHBRG4Q1 is a sub-1 GHz RF transceiver IC designed for short-range wireless links in the 310 MHz, 420–450 MHz, and 779–928 MHz ISM bands. It operates as a TxRx Only device — the baseband processing and protocol stack run on an external microcontroller via the SPI interface. The part supports multiple modulation formats (2FSK, GFSK, ASK, MSK, OOK) and delivers a receiver sensitivity of -114 dBm, which directly sets the usable range for a given output power and antenna gain. With a maximum data rate of 250 kBaud and a programmable output power up to 11 dBm, this device fits telemetry, remote keyless entry, home automation, and industrial sensor networks where sub-1 GHz propagation (better wall penetration than 2.4 GHz) is an advantage.
Frequency bands and regional deployment
The CC1101IRHBRG4Q1 covers three distinct frequency ranges: 310–348 MHz, 420–450 MHz, and 779–928 MHz. This allows a single BOM line to serve products destined for the 315/433 MHz ISM bands (common in North America and Europe) as well as the 868/915 MHz bands (Europe and Americas). The wide 779–928 MHz window also covers the 920 MHz band used in Japan and Australia. For a procurement team, this means one qualified RF front-end can be used across multiple regional variants, simplifying inventory and qualification effort.
Supply, interface, and package
The serial interface is SPI, so the host microcontroller handles all protocol framing and data buffering.
Current consumption profile
Receive current ranges from 15.5 mA to 19.3 mA depending on the mode and settings. Transmit current varies more widely — from 12.1 mA at lower output levels up to 35.5 mA when driving the full 11 dBm output. These numbers are important for battery-life budgeting in portable or remote sensor nodes. The supply range down to 1.8 V also helps extend run time as the battery discharges.
For a production buyer, this means no last-time-buy risk and no pressure to qualify an alternative for ongoing builds.