component
SI4468-A2A-IM
Public Made by Adomby adom
SILICON LABS RF Transceiver ICs, QFN-20(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"mpn": "SI4468-A2A-IM",
"manufacturer": "SILICON LABS",
"package": "QFN-20(4x4)",
"pin_count": 21,
"category": "Radio Frequency Chip/Antenna",
"subcategory": "RF Transceiver ICs",
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{
"number": "1",
"name": "SDN",
"type": "input",
"description": "Shutdown input (0-VDD V digital): SDN must be 0 in all modes except Shutdown, and when SDN=1 the chip is fully shut down and register contents are lost."
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{
"number": "2",
"name": "RXp",
"type": "input",
"description": "Differential RF input pin of the LNA; see the application schematic for the example matching network."
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{
"number": "3",
"name": "RXn",
"type": "input",
"description": "Differential RF input pin of the LNA; see the application schematic for the example matching network."
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{
"number": "4",
"name": "TX",
"type": "output",
"description": "Transmit output pin; the PA output is open-drain, so the L-C match must supply VDD (+3.3 VDC nominal) to this pin."
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{
"number": "5",
"name": "NC",
"type": "unconnected",
"description": "Not connected internally to any circuitry; recommended to connect to GND per the reference design schematic."
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{
"number": "6",
"name": "VDD",
"type": "power_in",
"description": "Supply voltage input to internal regulators, +1.8 to +3.8 V, with recommended supply of +3.3 V."
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{
"number": "7",
"name": "TXRAMP",
"type": "output",
"description": "Programmable bias output with ramp capability for an external FET PA."
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{
"number": "8",
"name": "VDD",
"type": "power_in",
"description": "Supply voltage input to internal regulators, +1.8 to +3.8 V, with recommended supply of +3.3 V."
},
{
"number": "9",
"name": "GPIO0",
"type": "bidirectional",
"description": "General purpose digital I/O configurable through registers for functions such as MCU clock output, FIFO status, POR, wake-up timer, low battery detect, TRSW and antenna diversity control."
},
{
"number": "10",
"name": "GPIO1",
"type": "bidirectional",
"description": "General purpose digital I/O; the datasheet gives no separate function list for this pin."
},
{
"number": "11",
"name": "nIRQ",
"type": "output",
"description": "General microcontroller interrupt status output, set low when an interrupt event occurs; no external pull-up is required, though one may be desirable with multiple interrupt lines."
},
{
"number": "12",
"name": "SCLK",
"type": "input",
"description": "Serial clock input (0-VDD V digital) for the 4-line serial bus; data is clocked in on positive edge transitions."
},
{
"number": "13",
"name": "SDO",
"type": "output",
"description": "Serial data readback output (0-VDD V digital) of the internal control registers."
},
{
"number": "14",
"name": "SDI",
"type": "input",
"description": "Serial data input (0-VDD V digital) for the 4-line serial data bus."
},
{
"number": "15",
"name": "nSEL",
"type": "input",
"description": "Serial interface select input (0-VDD V digital) providing the select/enable function for the 4-line serial bus."
},
{
"number": "16",
"name": "XOUT",
"type": "output",
"description": "Crystal oscillator output; connect to an external 25 to 32 MHz crystal, or leave floating when driving with an external source on XIN."
},
{
"number": "17",
"name": "XIN",
"type": "input",
"description": "Crystal oscillator input; connect to an external 25 to 32 MHz crystal or to an external source."
},
{
"number": "18",
"name": "GND",
"type": "power_in",
"description": "Ground: leave floating per the reference design when using an XTAL; when using a TCXO, connect to TCXO GND, which should be separate from the board reference ground plane."
},
{
"number": "19",
"name": "GPIO2",
"type": "bidirectional",
"description": "General purpose digital I/O configurable through registers for functions such as MCU clock output, FIFO status, POR, wake-up timer, low battery detect, TRSW and antenna diversity control."
},
{
"number": "20",
"name": "GPIO3",
"type": "bidirectional",
"description": "General purpose digital I/O; the datasheet gives no separate function list for this pin."
},
{
"number": "21",
"name": "EP",
"type": "passive",
"description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
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"primary_model": "claude-haiku-5-5",
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"1/21 pins cited to the wrong page (name found elsewhere): ['17:XIN@p49']"
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"at": "2026-11-02T18:03:10"
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{
"name": "Instantaneous VRF-peak to GND on TX Output Pin",
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"kind": "thermal",
"unit": "°C/W",
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"conditions": "Based on RF evaluation board measurements",
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"name": "Junction Temperature Maximum",
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"min": null,
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{
"name": "Storage Temperature Range",
"symbol": "TSTG",
"kind": "thermal",
"unit": "°C",
"min": -55,
"typ": null,
"max": 150,
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