component
SI4461-C2A-GMR
Public Made by Adomby adom
SILICON LABS RF Transceiver ICs, QFN-20-EP(4x4). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
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{
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"type": "component",
"slug": "si4461-c2a-gmr",
"title": "SI4461-C2A-GMR",
"brief": "SILICON LABS RF Transceiver ICs, QFN-20-EP(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": [
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"rf & radio",
"si4461-c2a-gmr",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "SI4461-C2A-GMR",
"manufacturer": "SILICON LABS",
"package": "QFN-20-EP(4x4)",
"pin_count": 21,
"category": "RF & Radio",
"subcategory": "RF Transceiver ICs",
"datasheet": "https://datasheet.lcsc.com/datasheet/pdf/c9b3d6b38b5500d80adf50c8047d5f16.pdf",
"parts": {
"symbol": "si4461-c2a-gmr.kicad_sym",
"footprint": "si4461-c2a-gmr.kicad_mod",
"model_3d": "si4461-c2a-gmr-hero.glb",
"model_3d_plain": "si4461-c2a-gmr-etched.glb",
"model_3d_step": "si4461-c2a-gmr-etched.step",
"model_3d_step_plain": "si4461-c2a-gmr.step",
"lbr": "si4461-c2a-gmr.lbr"
},
"distributor_links": {
"lcsc": "C2151525"
},
"distributor_check": {
"checked_at": "2026-10-22T21:11:21Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": null,
"status": "quota"
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"mouser": {
"pn": null,
"status": "quota"
}
},
"pins": [
{
"number": "1",
"name": "SDN",
"type": "input",
"description": "Shutdown input, 0-VDD V digital; must be 0 in all modes except Shutdown, and when 1 the chip is completely shut down and register contents are lost."
},
{
"number": "2",
"name": "RXp",
"type": "input",
"description": "Differential RF input of the LNA; see application schematic for example matching network."
},
{
"number": "3",
"name": "RXn",
"type": "input",
"description": "Differential RF input of the LNA; see application schematic for example matching network."
},
{
"number": "4",
"name": "TX",
"type": "output",
"description": "Transmit output; PA output is open-drain so the L-C match must supply VDD (+3.3 VDC nominal) to this pin."
},
{
"number": "5",
"name": "NC",
"type": "unconnected",
"description": "Not connected internally to any circuitry; recommended to connect to GND per the reference design schematic."
},
{
"number": "6",
"name": "VDD",
"type": "power_in",
"description": "+1.8 to +3.8 V supply input to internal regulators; recommended +3.3 V."
},
{
"number": "7",
"name": "TXRAMP",
"type": "output",
"description": "Programmable bias output with ramp capability for external FET PA."
},
{
"number": "8",
"name": "VDD",
"type": "power_in",
"description": "+1.8 to +3.8 V supply input to internal regulators; recommended +3.3 V."
},
{
"number": "9",
"name": "GPIO0",
"type": "bidirectional",
"description": "General purpose digital I/O configurable via registers for functions such as microcontroller 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 configurable via registers for functions such as microcontroller clock output, FIFO status, POR, wake-up timer, low battery detect, TRSW and antenna diversity control."
},
{
"number": "11",
"name": "nIRQ",
"type": "output",
"description": "Interrupt status output, set low on any interrupt event; no external pull-up required but may be desirable if multiple interrupt lines are connected."
},
{
"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": "0-VDD V digital output providing serial readback of the internal control registers."
},
{
"number": "14",
"name": "SDI",
"type": "input",
"description": "Serial data input, 0-VDD V digital, for the 4-line serial bus."
},
{
"number": "15",
"name": "nSEL",
"type": "input",
"description": "Serial interface select input, 0-VDD V digital, providing select/enable 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 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": "Leave floating when using an XTAL per the reference design; when using a TCXO connect to TCXO GND, separate from the board reference ground plane."
},
{
"number": "19",
"name": "GPIO2",
"type": "bidirectional",
"description": "General purpose digital I/O configurable via registers for functions such as microcontroller 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 configurable via registers for functions such as microcontroller clock output, FIFO status, POR, wake-up timer, low battery detect, TRSW and antenna diversity control."
},
{
"number": "21",
"name": "PADDLE_GND",
"type": "power_in",
"description": "Exposed paddle supplying RF and circuit ground for the entire chip; requires a good solder connection to the PCB ground plane."
}
],
"provenance": {
"extractor": "extract_pins 0.3",
"factory_chain": {
"factory": "2.0.0",
"extractor": "extract_pins 0.3",
"primary_model": "claude-sonnet-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 gives no number for the exposed paddle. '21' is an assumed designator for the PKG PADD; Pin 18 is labeled GND, but the description says to leave it floating with a crystal. It connects to ; The ordering table lists Si4461-C2A-GM with an (R) suffix for tape and reel. The package is describe",
"2/21 pins cited to the wrong page (name found elsewhere): ['17:XIN@p45', '21:PADDLE_GND@p45']"
],
"pages_sent": 12,
"cost_usd": 0.1346,
"at": "2026-10-22T21:11:11"
},
"datasheet": {
"url": "https://datasheet.lcsc.com/datasheet/pdf/c9b3d6b38b5500d80adf50c8047d5f16.pdf",
"pages": 53,
"sha256": "8882300b5eda9509",
"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": "si4461-c2a-gmr.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": "2026-10-22",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "si4461-c2a-gmr-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
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"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "b2a1d78aab7af56fc268e25f8a740fee637abb9e8cf00deb61bb141e2705c297",
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]
},
"metadata": {
"specs": {
"Manufacturer": "SILICON LABS",
"Package": "QFN-20-EP(4x4)",
"Category": "RF & Radio",
"Pins": "21"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "8882300b5eda9509ea77fbc23f8d0ac0d1f509227b78d9faddcf4bfd5aef2376",
"rows": [
{
"name": "Supply Voltage Range",
"symbol": "VDD",
"kind": "recommended_operating",
"unit": "V",
"min": 1.8,
"typ": 3.3,
"max": 3.8,
"conditions": "",
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{
"name": "Shutdown current",
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"min": null,
"typ": 30,
"max": 1300,
"conditions": "RC Oscillator, Main Digital Regulator, and Low Power Digital Regulator OFF",
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"source": "datasheet"
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{
"name": "Standby current",
"symbol": "IStandby",
"kind": "electrical",
"unit": "nA",
"min": null,
"typ": 40,
"max": 2900,
"conditions": "Register values maintained and RC oscillator/WUT OFF",
"source_page": 4,
"source": "datasheet"
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{
"name": "Sleep current (RC oscillator)",
"symbol": "ISleepRC",
"kind": "electrical",
"unit": "nA",
"min": null,
"typ": 740,
"max": 3800,
"conditions": "RC Oscillator/WUT ON and all register values maintained, and all other blocks OFF",
"source_page": 4,
"source": "datasheet"
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{
"name": "RX mode current, high performance",
"symbol": "IRXH",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 13.7,
"max": 22,
"conditions": "High Performance Mode (measured at 915 MHz and 40 kbps data rate)",
"source_page": 4,
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{
"name": "TX mode current (Si4461) +16 dBm",
"symbol": "ITX_+16",
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"conditions": "+16 dBm output power, class-E match, 868 MHz, 3.3 V",
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{
"name": "TX mode current (Si4461) +13 dBm",
"symbol": "ITX_+13",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": 33.5,
"max": 40,
"conditions": "+13 dBm output power, switched-current match, 868 MHz, 3.3 V",
"source_page": 4,
"source": "datasheet"
},
{
"name": "Synthesizer frequency range 850-1050",
"symbol": "FSYN",
"kind": "electrical",
"unit": "MHz",
"min": 850,
"typ": null,
"max": 1050,
"conditions": "",
"source_page": 5,
"source": "datasheet"
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{
"name": "Synthesizer frequency range 350-525",
"symbol": "FSYN",
"kind": "electrical",
"unit": "MHz",
"min": 350,
"typ": null,
"max": 525,
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"source_page": 5,
"source": "datasheet"
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{
"name": "Synthesizer frequency range 284-350",
"symbol": "FSYN",
"kind": "electrical",
"unit": "MHz",
"min": 284,
"typ": null,
"max": 350,
"conditions": "",
"source_page": 5,
"source": "datasheet"
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{
"name": "Synthesizer frequency range 142-175",
"symbol": "FSYN",
"kind": "electrical",
"unit": "MHz",
"min": 142,
"typ": null,
"max": 175,
"conditions": "",
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{
"name": "Phase noise 10 kHz, 169 MHz",
"symbol": "L(fM)",
"kind": "electrical",
"unit": "dBc/Hz",
"min": null,
"typ": -117,
"max": -108,
"conditions": "F = 10 kHz, 169 MHz, High Perf Mode",
"source_page": 5,
"source": "datasheet"
},
{
"name": "Phase noise 100 kHz, 169 MHz",
"symbol": "L(fM)",
"kind": "electrical",
"unit": "dBc/Hz",
"min": null,
"typ": -120,
"max": -115,
"conditions": "F = 100 kHz, 169 MHz, High Perf Mode",
"source_page": 5,
"source": "datasheet"
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{
"name": "Phase noise 1 MHz, 169 MHz",
"symbol": "L(fM)",
"kind": "electrical",
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"min": null,
"typ": -138,
"max": -135,
"conditions": "F = 1 MHz, 169 MHz, High Perf Mode",
"source_page": 5,
"source": "datasheet"
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{
"name": "Phase noise 10 MHz, 169 MHz",
"symbol": "L(fM)",
"kind": "electrical",
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"min": null,
"typ": -148,
"max": -143,
"conditions": "F = 10 MHz, 169 MHz, High Perf Mode",
"source_page": 5,
"source": "datasheet"
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{
"name": "Phase noise 10 kHz, 915 MHz",
"symbol": "L(fM)",
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"unit": "dBc/Hz",
"min": null,
"typ": -102,
"max": -94,
"conditions": "F = 10 kHz, 915 MHz, High Perf Mode",
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"source": "datasheet"
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{
"name": "Phase noise 100 kHz, 915 MHz",
"symbol": "L(fM)",
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"min": null,
"typ": -105,
"max": -97,
"conditions": "F = 100 kHz, 915 MHz, High Perf Mode",
"source_page": 5,
"source": "datasheet"
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{
"name": "Phase noise 1 MHz, 915 MHz",
"symbol": "L(fM)",
"kind": "electrical",
"unit": "dBc/Hz",
"min": null,
"typ": -125,
"max": -122,
"conditions": "F = 1 MHz, 915 MHz, High Perf Mode",
"source_page": 5,
"source": "datasheet"
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{
"name": "Phase noise 10 MHz, 915 MHz",
"symbol": "L(fM)",
"kind": "electrical",
"unit": "dBc/Hz",
"min": null,
"typ": -138,
"max": -135,
"conditions": "F = 10 MHz, 915 MHz, High Perf Mode",
"source_page": 5,
"source": "datasheet"
},
{
"name": "RX sensitivity 40 kbps, 169 MHz",
"symbol": "PRX_40",
"kind": "electrical",
"unit": "dBm",
"min": null,
"typ": -110,
"max": -108,
"conditions": "BER < 0.1%, 40 kbps, GFSK, BT = 0.5, Δf = 20 kHz",
"source_page": 6,
"source": "datasheet"
},
{
"name": "RX sensitivity 100 kbps, 169 MHz",
"symbol": "PRX_100",
"kind": "electrical",
"unit": "dBm",
"min": null,
"typ": -106,
"max": -104,
"conditions": "BER < 0.1%, 100 kbps, GFSK, BT = 0.5, Δf = 50 kHz",
"source_page": 6,
"source": "datasheet"
},
{
"name": "RX sensitivity 500 kbps, 169 MHz",
"symbol": "PRX_500",
"kind": "electrical",
"unit": "dBm",
"min": null,
"typ": -98,
"max": -96,
"conditions": "BER < 0.1%, 500 kbps, GFSK, BT = 0.5, Δf = 250 kHz",
"source_page": 6,
"source": "datasheet"
},
{
"name": "RX sensitivity 40 kbps, 915/868 MHz",
"symbol": "PRX_40",
"kind": "electrical",
"unit": "dBm",
"min": null,
"typ": -109,
"max": -107,
"conditions": "BER < 0.1%, 40 kbps, GFSK, BT = 0.5, Δf = 20 kHz",
"source_page": 7,
"source": "datasheet"
},
{
"name": "RX sensitivity 100 kbps, 915/868 MHz",
"symbol": "PRX_100",
"kind": "electrical",
"unit": "dBm",
"min": null,
"typ": -104,
"max": -102,
"conditions": "BER < 0.1%, 100 kbps, GFSK, BT = 0.5, Δf = 50 kHz",
"source_page": 7,
"source": "datasheet"
},
{
"name": "RX sensitivity 500 kbps, 915/868 MHz",
"symbol": "PRX_500",
"kind": "electrical",
"unit": "dBm",
"min": null,
"typ": -97,
"max": -92,
"conditions": "BER < 0.1%, 500 kbps, GFSK, BT = 0.5, Δf = 250 kHz",
"source_page": 7,
"source": "datasheet"
},
{
"name": "RX channel bandwidth",
"symbol": "BW",
"kind": "electrical",
"unit": "kHz",
"min": 1.1,
"typ": null,
"max": 850,
"conditions": "",
"source_page": 7,
"source": "datasheet"
},
{
"name": "1-Ch offset selectivity, 169 MHz",
"symbol": "C/I1-CH",
"kind": "electrical",
"unit": "dB",
"min": null,
"typ": -69,
"max": -59,
"conditions": "channel spacing = 12.5 kHz, RX channel BW = 4.8 kHz",
"source_page": 7,
"source": "datasheet"
},
{
"name": "1-Ch offset selectivity, 450 MHz",
"symbol": "C/I1-CH",
"kind": "electrical",
"unit": "dB",
"min": null,
"typ": -60,
"max": -50,
"conditions": "channel spacing = 12.5 kHz, RX channel BW = 4.8 kHz",
"source_page": 7,
"source": "datasheet"
},
{
"name": "1-Ch offset selectivity, 868/915 MHz",
"symbol": "C/I1-CH",
"kind": "electrical",
"unit": "dB",
"min": null,
"typ": -55,
"max": -45,
"conditions": "channel spacing = 12.5 kHz, RX channel BW = 4.8 kHz",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Blocking 1 MHz offset",
"symbol": "1MBLOCK",
"kind": "electrical",
"unit": "dB",
"min": null,
"typ": -79,
"max": -68,
"conditions": "RX channel BW = 4.8 kHz",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Blocking 8 MHz offset",
"symbol": "8MBLOCK",
"kind": "electrical",
"unit": "dB",
"min": null,
"typ": -86,
"max": -75,
"conditions": "RX channel BW = 4.8 kHz",
"source_page": 7,
"source": "datasheet"
},
{
"name": "Image rejection, no calibration, 460 MHz",
"symbol": "ImREJ",
"kind": "electrical",
"unit": "dB",
"min": 30,
"typ": 40,
"max": null,
"conditions": "No image rejection calibration, RF = 460 MHz",
"source_page": 8,
"source": "datasheet"
},
{
"name": "Image rejection, calibrated, 460 MHz",
"symbol": "ImREJ",
"kind": "electrical",
"unit": "dB",
"min": 40,
"typ": 55,
"max": null,
"conditions": "With image rejection calibration, RF = 460 MHz",
"source_page": 8,
"source": "datasheet"
},
{
"name": "Image rejection, no calibration, 915 MHz",
"symbol": "ImREJ",
"kind": "electrical",
"unit": "dB",
"min": 30,
"typ": 45,
"max": null,
"conditions": "No image rejection calibration, RF = 915 MHz",
"source_page": 8,
"source": "datasheet"
},
{
"name": "Image rejection, calibrated, 915 MHz",
"symbol": "ImREJ",
"kind": "electrical",
"unit": "dB",
"min": 40,
"typ": 52,
"max": null,
"conditions": "With image rejection calibration, RF = 915 MHz",
"source_page": 8,
"source": "datasheet"
},
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