Part	Data Rate (Max)	Sensitivity	Current - Transmitting (Max)	Current - Transmitting (Min)	Modulation	Frequency	Frequency	Operating Temperature (Min)	Operating Temperature (Max)	Current - Receiving (Min)	Current - Receiving (Max)	Power - Output	Mounting Type	Serial Interfaces	Voltage - Supply (Minimum)	Voltage - Supply (Maximum)	Type	RF Family/Standard	Package Length	Package Name	Package Width
SILICON LABS SI4421-A0-FTR	256 kbps	-110 dBm	24 mA	15 mA	FSK	315MHz 434MHz 868MHz 915MHz	315 MHz 434 MHz 868 MHz 915 MHz	-40 °C	85 °C	11 mA	13 mA	7 dBm	Surface Mount	SPI	2.2 V	3.8 V	TxRx Only	General ISM < 1GHz	0.173 in	16-TSSOP	4.4 mm
SILICON LABS SI4421-A1-FT1R
SILICON LABS SI4421-A0-FT	256 kbps	-110 dBm	24 mA	15 mA	FSK	315MHz 434MHz 868MHz 915MHz	315 MHz 434 MHz 868 MHz 915 MHz	-40 °C	85 °C	11 mA	13 mA	7 dBm	Surface Mount	SPI	2.2 V	3.8 V	TxRx Only	General ISM < 1GHz	0.173 in	16-TSSOP	4.4 mm
SILICON LABS SI4421-A1-FTR	256 kbps	-110 dBm	24 mA	15 mA	FSK	315MHz 434MHz 868MHz 915MHz	315 MHz 434 MHz 868 MHz 915 MHz	-40 °C	85 °C	11 mA	13 mA	7 dBm	Surface Mount	SPI	2.2 V	3.8 V	TxRx Only	General ISM < 1GHz	0.173 in	16-TSSOP	4.4 mm
SILICON LABS SI4421-A1-FT	256 kbps	-110 dBm	24 mA	15 mA	FSK	315MHz 434MHz 868MHz 915MHz	315 MHz 434 MHz 868 MHz 915 MHz	-40 °C	85 °C	11 mA	13 mA	7 dBm	Surface Mount	SPI	2.2 V	3.8 V	TxRx Only	General ISM < 1GHz	0.173 in	16-TSSOP	4.4 mm
SILICON LABS SI4421-A1-FT1

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