component
SI4431-B1-FM
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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{
"schema_version": 1,
"type": "component",
"slug": "si4431-b1-fm",
"title": "SI4431-B1-FM",
"brief": "SILICON LABS RF Transceiver ICs, QFN-20(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
"version": "0.1.0",
"license": "CC-BY-SA-4.0",
"tags": [
"component",
"radio frequency chip-antenna",
"si4431-b1-fm",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "SI4431-B1-FM",
"manufacturer": "SILICON LABS",
"package": "QFN-20(4x4)",
"pin_count": 21,
"category": "Radio Frequency Chip/Antenna",
"subcategory": "RF Transceiver ICs",
"datasheet": "https://datasheet.lcsc.com/datasheet/pdf/b1880380f93bf93be3f4d9f9a4cdfefa.pdf",
"parts": {
"symbol": "si4431-b1-fm.kicad_sym",
"footprint": "si4431-b1-fm.kicad_mod",
"model_3d": "si4431-b1-fm-hero.glb",
"model_3d_plain": "si4431-b1-fm-etched.glb",
"model_3d_step": "si4431-b1-fm-etched.step",
"model_3d_step_plain": "si4431-b1-fm.step",
"lbr": "si4431-b1-fm.lbr"
},
"distributor_links": {
"lcsc": "C3606893",
"digikey": "336-2521-5-ND",
"mouser": "634-SI4431-B1-FM"
},
"distributor_check": {
"checked_at": "2026-10-31T18:42:35Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "336-2521-5-ND",
"status": "found"
},
"mouser": {
"pn": "634-SI4431-B1-FM",
"status": "found"
}
},
"pins": [
{
"number": "1",
"name": "VDD_RF",
"type": "power_in",
"description": "Supply input to all analog +1.7 V regulators, with a supply range of +1.8 to +3.6 V and a recommended +3.3 V."
},
{
"number": "2",
"name": "TX",
"type": "output",
"description": "Transmit output is an open-drain PA output, so the L-C match must supply VDD (+3.3 VDC nominal) to this pin."
},
{
"number": "3",
"name": "RXp",
"type": "input",
"description": "Differential RF input pin of the LNA, connected through the application matching network."
},
{
"number": "4",
"name": "RXn",
"type": "input",
"description": "Differential RF input pin of the LNA, connected through the application matching network."
},
{
"number": "5",
"name": "NC",
"type": "unconnected",
"description": "No Connect pin, not connected internally to any circuitry."
},
{
"number": "6",
"name": "ANT",
"type": "output",
"description": "Extra antenna or TR switch control output, a hardwired version of GPIO setting 11000 (Antenna 2) that can be controlled by the antdiv[2:0] bits in register 08h."
},
{
"number": "7",
"name": "GPIO_0",
"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": "8",
"name": "GPIO_1",
"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": "9",
"name": "GPIO_2",
"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": "VR_DIG",
"type": "power_out",
"description": "Regulated output of the digital 1.7 V regulator, which requires a 1 µF decoupling capacitor."
},
{
"number": "11",
"name": "NC",
"type": "unconnected",
"description": "Internally tied to the package paddle, so it should be left unconnected or connected to GND only."
},
{
"number": "12",
"name": "VDD_DIG",
"type": "power_in",
"description": "Supply input to the digital +1.7 V regulator, with a supply range of +1.8 to +3.6 V and a recommended +3.3 V."
},
{
"number": "13",
"name": "SDO",
"type": "output",
"description": "Serial readback digital output of the internal control registers, swinging 0 to VDD V."
},
{
"number": "14",
"name": "SDI",
"type": "input",
"description": "Serial data input of the 4-line serial bus, a 0 to VDD V digital input."
},
{
"number": "15",
"name": "SCLK",
"type": "input",
"description": "Serial clock input of the 4-line serial bus, a 0 to VDD V digital input; data is clocked in on positive edge transitions."
},
{
"number": "16",
"name": "nSEL",
"type": "input",
"description": "Serial interface select (enable) input, a 0 to VDD V digital input that also signals burst read/write mode."
},
{
"number": "17",
"name": "nIRQ",
"type": "output",
"description": "Microcontroller interrupt status output that is driven low when an interrupt event occurs, and needs no external pull-up unless multiple interrupt lines are tied together."
},
{
"number": "18",
"name": "XOUT",
"type": "output",
"description": "Crystal oscillator output for an external 30 MHz crystal or source; an external source without crystal needs dc coupling at a nominal 0.8 VDC with at least 700 mVpp amplitude."
},
{
"number": "19",
"name": "XIN",
"type": "input",
"description": "Crystal oscillator input for an external 30 MHz crystal, or left floating when driving an external source on XOUT."
},
{
"number": "20",
"name": "SDN",
"type": "input",
"description": "Shutdown input, a 0 to VDD V digital input that must be 0 in all modes except shutdown; setting it to 1 fully shuts down the chip and loses register contents."
},
{
"number": "21",
"name": "PADDLE_GND",
"type": "passive",
"description": "Exposed pad (from the footprint; not named in the datasheet pin table)."
}
],
"provenance": {
"extractor": "extract_pins 0.3",
"factory_chain": {
"factory": "2.0.0",
"extractor": "extract_pins 0.3",
"primary_model": "claude-haiku-5-5",
"primary_mode": "text",
"consensus_model": "claude-sonnet-5-5",
"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
"extractor flagged: The datasheet covers Si4430/31/32 and the Si4431-B1-FM is listed as QFN-20 Pb-free in the ordering t",
"2/21 pins cited to the wrong page (name found elsewhere): ['18:XOUT@p66', '19:XIN@p66']"
],
"pages_sent": 10,
"cost_usd": 0.025,
"at": "2026-10-31T18:42:22"
},
"datasheet": {
"url": "https://datasheet.lcsc.com/datasheet/pdf/b1880380f93bf93be3f4d9f9a4cdfefa.pdf",
"pages": 74,
"sha256": "a0dc9f652a3ee30e",
"source_tier": "lcsc"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 21,
"described": 21,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
{
"file": "si4431-b1-fm.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
4,
4,
0.77
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "c9476a1612023de37f27b4972110ab6ac6dc0eaf5ac48957a2e1c497650082a5",
"checked": "2026-10-31",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "si4431-b1-fm-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
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"footprint_binding": "identity",
"sha256": "39d6b32f6afa76f7e1e8bb1db4863135cbe836a7c2972503ddfbd7558fa99861",
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]
},
"metadata": {
"specs": {
"Manufacturer": "SILICON LABS",
"Package": "QFN-20(4x4)",
"Category": "Radio Frequency Chip/Antenna",
"Pins": "21"
},
"appearance": {
"housing": {
"quote": "wireless knowledge base at www.silabs.com/support/knowledgebase.",
"page": 63,
"doc": "ds.pdf",
"material": "abs"
},
"version": 1,
"datasheet_sha256": "a0dc9f652a3ee30e94cf3ad452310ec441cc6bae03a07a844cd1cd3c8c49b872"
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"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "a0dc9f652a3ee30e94cf3ad452310ec441cc6bae03a07a844cd1cd3c8c49b872",
"rows": [
{
"name": "Supply Voltage Range",
"symbol": "VDD",
"kind": "electrical",
"unit": "V",
"min": 1.8,
"typ": 3,
"max": 3.6,
"conditions": "",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Shutdown current",
"symbol": "IShutdown",
"kind": "electrical",
"unit": "nA",
"min": null,
"typ": 15,
"max": 50,
"conditions": "RC Oscillator, Main Digital Regulator, and Low Power Digital Regulator OFF",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Standby current",
"symbol": "IStandby",
"kind": "electrical",
"unit": "nA",
"min": null,
"typ": 450,
"max": 800,
"conditions": "Low Power Digital Regulator ON (Register values retained) and Main Digital Regulator, and RC Oscillator OFF",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Sleep current",
"symbol": "ISleep",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 1,
"max": null,
"conditions": "RC Oscillator and Low Power Digital Regulator ON (Register values retained) and Main Digital Regulator OFF",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Ready mode current",
"symbol": "IReady",
"kind": "electrical",
"unit": "µA",
"min": null,
"typ": 800,
"max": null,
"conditions": "Crystal Oscillator and Main Digital Regulator ON, all other blocks OFF. Crystal Oscillator buffer disabled",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Tune mode current",
"symbol": "ITune",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 8.5,
"max": null,
"conditions": "Synthesizer and regulators enabled",
"source_page": 7,
"source": "datasheet"
},
{
"name": "RX mode current",
"symbol": "IRX",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 18.5,
"max": null,
"conditions": "",
"source_page": 7,
"source": "datasheet"
},
{
"name": "TX mode current +13 dBm",
"symbol": "ITX_+13",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 30,
"max": null,
"conditions": "txpow[2:0] = 110 (+13 dBm)",
"source_page": 7,
"source": "datasheet"
},
{
"name": "TX mode current +1 dBm",
"symbol": "ITX_+1",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 17,
"max": null,
"conditions": "txpow[2:0] = 010 (+1 dBm)",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Synthesizer Frequency Range",
"symbol": "FSYN",
"kind": "electrical",
"unit": "MHz",
"min": 240,
"typ": null,
"max": 930,
"conditions": "Si4431/32",
"source_page": 8,
"source": "datasheet"
},
{
"name": "Reference Frequency Input Level",
"symbol": "fREF_LV",
"kind": "electrical",
"unit": "V",
"min": 0.7,
"typ": null,
"max": 1.6,
"conditions": "External reference signal driving XOUT pin, peak-to-peak (VPP)",
"source_page": 8,
"source": "datasheet"
},
{
"name": "Residual FM",
"symbol": "FRMS",
"kind": "electrical",
"unit": "kHzRMS",
"min": null,
"typ": 2,
"max": 4,
"conditions": "Integrated over 250 kHz bandwidth (500 Hz lower bound of integration)",
"source_page": 8,
"source": "datasheet"
},
{
"name": "RX Frequency Range",
"symbol": "FRX",
"kind": "electrical",
"unit": "MHz",
"min": 240,
"typ": null,
"max": 930,
"conditions": "Si4431/32",
"source_page": 9,
"source": "datasheet"
},
{
"name": "RX Channel Bandwidth",
"symbol": "BW",
"kind": "electrical",
"unit": "kHz",
"min": 2.6,
"typ": null,
"max": 620,
"conditions": "",
"source_page": 9,
"source": "datasheet"
},
{
"name": "BER Variation vs Power Level",
"symbol": "PRX_RES",
"kind": "electrical",
"unit": "ppm",
"min": null,
"typ": 0,
"max": 0.1,
"conditions": "Up to +5 dBm Input Level",
"source_page": 9,
"source": "datasheet"
},
{
"name": "Spurious Emissions RX",
"symbol": "POB_RX1",
"kind": "electrical",
"unit": "dBm",
"min": null,
"typ": null,
"max": -54,
"conditions": "Measured at RX pins",
"source_page": 9,
"source": "datasheet"
},
{
"name": "TX Frequency Range",
"symbol": "FTX",
"kind": "electrical",
"unit": "MHz",
"min": 240,
"typ": null,
"max": 930,
"conditions": "Si4431/32",
"source_page": 10,
"source": "datasheet"
},
{
"name": "FSK Data Rate",
"symbol": "DRFSK",
"kind": "electrical",
"unit": "kbps",
"min": 0.123,
"typ": null,
"max": 256,
"conditions": "",
"source_page": 10,
"source": "datasheet"
},
{
"name": "OOK Data Rate",
"symbol": "DROOK",
"kind": "electrical",
"unit": "kbps",
"min": 0.123,
"typ": null,
"max": 40,
"conditions": "",
"source_page": 10,
"source": "datasheet"
},
{
"name": "Modulation Deviation 860–960 MHz",
"symbol": "∆f1",
"kind": "electrical",
"unit": "kHz",
"min": 0.625,
"typ": null,
"max": 320,
"conditions": "860–960 MHz",
"source_page": 10,
"source": "datasheet"
},
{
"name": "Modulation Deviation 240–860 MHz",
"symbol": "∆f2",
"kind": "electrical",
"unit": "kHz",
"min": 0.625,
"typ": null,
"max": 160,
"conditions": "240–860 MHz",
"source_page": 10,
"source": "datasheet"
},
{
"name": "Output Power Range",
"symbol": "PTX",
"kind": "electrical",
"unit": "dBm",
"min": -8,
"typ": null,
"max": 13,
"conditions": "Si4430/31",
"source_page": 10,
"source": "datasheet"
},
{
"name": "Spurious Emissions TX <1 GHz",
"symbol": "POB-TX1",
"kind": "electrical",
"unit": "dBm",
"min": null,
"typ": null,
"max": -54,
"conditions": "POUT = +13 dBm, Frequencies <1 GHz",
"source_page": 10,
"source": "datasheet"
},
{
"name": "Spurious Emissions TX 1–12.75 GHz",
"symbol": "POB-TX2",
"kind": "electrical",
"unit": "dBm",
"min": null,
"typ": null,
"max": -54,
"conditions": "1–12.75 GHz, excluding harmonics",
"source_page": 10,
"source": "datasheet"
},
{
"name": "2nd Harmonic",
"symbol": "P2HARM",
"kind": "electrical",
"unit": "dBm",
"min": null,
"typ": null,
"max": -42,
"conditions": "Using reference design TX matching network and filter with max output power",
"source_page": 10,
"source": "datasheet"
},
{
"name": "3rd Harmonic",
"symbol": "P3HARM",
"kind": "electrical",
"unit": "dBm",
"min": null,
"typ": null,
"max": -42,
"conditions": "Using reference design TX matching network and filter with max output power",
"source_page": 10,
"source": "datasheet"
},
{
"name": "Digital IO Rise Time",
"symbol": "TRISE",
"kind": "timing",
"unit": "ns",
"min": null,
"typ": null,
"max": 8,
"conditions": "0.1 x VDD to 0.9 x VDD, CL= 5 pF",
"source_page": 12,
"source": "datasheet"
},
{
"name": "Digital IO Fall Time",
"symbol": "TFALL",
"kind": "timing",
"unit": "ns",
"min": null,
"typ": null,
"max": 8,
"conditions": "0.9 x VDD to 0.1 x VDD, CL= 5 pF",
"source_page": 12,
"source": "datasheet"
},
{
"name": "Digital IO Input Capacitance",
"symbol": "CIN",
"kind": "electrical",
"unit": "pF",
"min": null,
"typ": null,
"max": 1,
"conditions": "",
"source_page": 12,
"source": "datasheet"
},
{
"name": "Digital IO Logic High Input Voltage",
"symbol": "VIH",
"kind": "electrical",
"unit": "V",
"min": -0.6,
"typ": null,
"max": null,
"conditions": "VDD – 0.6 (min, relative to VDD)",
"source_page": 12,
"source": "datasheet"
},
{
"name": "Digital IO Logic Low Input Voltage",
"symbol": "VIL",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.6,
"conditions": "",
"source_page": 12,
"source": "datasheet"
},
{
"name": "Digital IO Input Current",
"symbol": "IIN",
"kind": "electrical",
"unit": "nA",
"min": -100,
"typ": null,
"max": 100,
"conditions": "0<VIN< VDD",
"source_page": 12,
"source": "datasheet"
},
{
"name": "Digital IO Logic Low Output Voltage",
"symbol": "VOL",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.6,
"conditions": "IOL<1 mA sink, VDD=1.8 V",
"source_page": 12,
"source": "datasheet"
},
{
"name": "GPIO Rise Time",
"symbol": "TRISE",
"kind": "timing",
"unit": "ns",
"min": null,
"typ": null,
"max": 8,
"conditions": "0.1 x VDD to 0.9 x VDD, CL= 10 pF, DRV<1:0>=HH",
"source_page": 12,
"source": "datasheet"
},
{
"name": "GPIO Fall Time",
"symbol": "TFALL",
"kind": "timing",
"unit": "ns",
"min": null,
"typ": null,
"max": 8,
"conditions": "0.9 x VDD to 0.1 x VDD, CL= 10 pF, DRV<1:0>=HH",
"source_page": 12,
"source": "datasheet"
},
{
"name": "GPIO Input Capacitance",
"symbol": "CIN",
"kind": "electrical",
"unit": "pF",
"min": null,
"typ": null,
"max": 1,
"conditions": "",
"source_page": 12,
"source": "datasheet"
},
{
"name": "GPIO Logic Low Input Voltage",
"symbol": "VIL",
"kind": "electrical",
"unit": "V",
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