component
SI4355-B1A-FMR
Public Made by Adomby adom
SKYWORKS SILICON LABS RF Transceiver ICs, QFN-20-EP(3x3). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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"title": "SI4355-B1A-FMR",
"brief": "SKYWORKS SILICON LABS RF Transceiver ICs, QFN-20-EP(3x3). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.",
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"category": "RF And Wireless",
"subcategory": "RF Transceiver ICs",
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{
"number": "1",
"name": "GND",
"type": "power_in",
"description": "Ground pin."
},
{
"number": "2",
"name": "SDN",
"type": "input",
"description": "Shutdown input (0 to VDD V): SDN = 1 puts the part in shutdown mode and all register contents are lost, while SDN = 0 selects all other modes."
},
{
"number": "3",
"name": "RXp",
"type": "input",
"description": "Differential RF receiver input pin (RXp/RXn pair)."
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{
"number": "4",
"name": "RXn",
"type": "input",
"description": "Differential RF receiver input pin (RXp/RXn pair)."
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{
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{
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{
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"type": "power_in",
"description": "Ground pin."
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{
"number": "10",
"name": "GPIO0",
"type": "bidirectional",
"description": "General purpose digital I/O; I/O drive voltage VGPIO is 1.8 to 3.6 V."
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{
"number": "11",
"name": "GPIO1",
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"description": "General purpose digital I/O; I/O drive voltage VGPIO is 1.8 to 3.6 V."
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{
"number": "12",
"name": "nIRQ",
"type": "output",
"description": "Interrupt status output: nIRQ = 0 indicates an interrupt event has occurred, and the interrupt status register gives the event details."
},
{
"number": "13",
"name": "SCLK",
"type": "input",
"description": "Serial clock input (0 to VDD V) providing the serial data clock for the 4-line serial data bus."
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{
"number": "14",
"name": "SDO",
"type": "output",
"description": "Serial data output (0 to VDD V) providing readback of internal control registers."
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{
"number": "15",
"name": "SDI",
"type": "input",
"description": "Serial data input (0 to VDD V) carrying the serial data stream for the 4-line serial data bus."
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{
"number": "16",
"name": "nSEL",
"type": "input",
"description": "Serial interface select input (0 to VDD V) providing the select/enable function for the 4-line serial data bus."
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{
"number": "17",
"name": "XOUT",
"type": "output",
"description": "Crystal oscillator output."
},
{
"number": "18",
"name": "XIN",
"type": "input",
"description": "Crystal oscillator input; no DC bias is required, but if used it should be set to 7 V as printed in the datasheet."
},
{
"number": "19",
"name": "GPIO2",
"type": "bidirectional",
"description": "General purpose digital I/O; I/O drive voltage VGPIO is 1.8 to 3.6 V."
},
{
"number": "20",
"name": "GPIO3",
"type": "bidirectional",
"description": "General purpose digital I/O; I/O drive voltage VGPIO is 1.8 to 3.6 V."
},
{
"number": "21",
"name": "EP",
"type": "passive",
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],
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"factory_chain": {
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"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 requested package hint is QFN-20-EP(3x3), but the datasheet text lists only pins 1 to 20 and doe; The MPN suffix -FMR is the tape-and-reel form of the Si4355-B1A-FM listed in the ordering section (t; Pin 18 (XIN) description says 'should be set to 7 V'. This value is printed as-is in the source text",
"exposed pad 21 added from the footprint",
"2/21 pins cited to the wrong page (name found elsewhere): ['17:XOUT@p28', '18:XIN@p28']"
],
"pages_sent": 11,
"cost_usd": 0.0493,
"at": "2026-10-20T09:51:04"
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"sha256": "0167ca134eeaee26",
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"described": 21,
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"name": "Synthesizer Frequency Range (283–350 MHz band)",
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"name": "RX Frequency Range (425–525 MHz band)",
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{
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"typ": null,
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"conditions": "Measured at RX pins",
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{
"name": "XTAL Range",
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{
"name": "Power Saving Mode Current (Shutdown)",
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{
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{
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"conditions": "Crystal Oscillator and Main Digital Regulator ON, all other blocks OFF",
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{
"name": "SPI Active Current",
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{
"name": "TUNE Mode Current",
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"conditions": "RX Tune",
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{
"name": "RX Mode Current",
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"name": "Synthesizer Frequency Resolution (850–960 MHz)",
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"name": "Synthesizer Frequency Resolution (425–525 MHz)",
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"name": "Synthesizer Frequency Resolution (283–350 MHz)",
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"typ": 38.1,
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{
"name": "Synthesizer Settling Time",
"symbol": "tLOCK",
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"conditions": "Measured from exiting Ready mode with XOSC running to any frequency, including VCO Calibration",
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{
"name": "RX Sensitivity (2.4 kbps GFSK)",
"symbol": "PRX-_2",
"kind": "electrical",
"unit": "dBm",
"min": null,
"typ": -116,
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"conditions": "BER < 0.1%, 2.4 kbps, GFSK, BT = 0.5, f = 30 kHz, 114 kHz Rx BW",
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{
"name": "RX Sensitivity (40 kbps GFSK)",
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"min": null,
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"conditions": "BER < 0.1%, 40 kbps, GFSK, BT = 0.5, f = 25 kHz, 114 kHz Rx BW",
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{
"name": "RX Sensitivity (128 kbps GFSK)",
"symbol": "PRX-_128",
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"min": null,
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"conditions": "BER < 0.1%, 128 kbps, GFSK, BT = 0.5, f = 70 kHz, 305 kHz Rx BW",
"source_page": 5,
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},
{
"name": "RX Sensitivity (OOK, 1 kbps)",
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"conditions": "BER < 0.1%, 1 kbps, 185 kHz Rx BW, OOK, PN15 data",
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{
"name": "RX Sensitivity (OOK, 40 kbps)",
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"typ": -102,
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"conditions": "BER < 0.1%, 40 kbps, 185 kHz Rx BW, OOK, PN15 data",
"source_page": 5,
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{
"name": "1-Ch Offset Selectivity",
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"min": null,
"typ": -56,
"max": null,
"conditions": "Desired ref signal 3 dB above sensitivity, BER < 0.1%; CW interferer, desired 1.2 kbps F = 5.2 kHz GFSK, BT = 0.5, Rx BW = 58 kHz, channel spacing = 100 kHz",
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{
"name": "2-Ch Offset Selectivity",
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{
"name": "Blocking 200 kHz–1 MHz",
"symbol": "200KBLOCK",
"kind": "electrical",
"unit": "dB",
"min": null,
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