component
CYW20721B2KUMLGT
Public Made by Adomby adom
Infineon Technologies RF Transceiver ICs, QFN-40(5x5). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
main
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{
"schema_version": 1,
"type": "component",
"slug": "cyw20721b2kumlgt",
"title": "CYW20721B2KUMLGT",
"brief": "Infineon Technologies RF Transceiver ICs, QFN-40(5x5). 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",
"cyw20721b2kumlgt",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "CYW20721B2KUMLGT",
"manufacturer": "Infineon Technologies",
"package": "QFN-40(5x5)",
"pin_count": 41,
"category": "Radio Frequency Chip/Antenna",
"subcategory": "RF Transceiver ICs",
"datasheet": "https://datasheet.lcsc.com/datasheet/pdf/95968376246a64ea802ccc8e34688ba5.pdf",
"parts": {
"symbol": "cyw20721b2kumlgt.kicad_sym",
"footprint": "cyw20721b2kumlgt.kicad_mod",
"model_3d": "cyw20721b2kumlgt-hero.glb",
"model_3d_plain": "cyw20721b2kumlgt-etched.glb",
"model_3d_step": "cyw20721b2kumlgt-etched.step",
"model_3d_step_plain": "cyw20721b2kumlgt.step",
"lbr": "cyw20721b2kumlgt.lbr"
},
"distributor_links": {
"lcsc": "C5690543",
"digikey": "448-CYW20721B2KUMLGTTR-ND",
"mouser": "727-CYW20721B2KUMLGT"
},
"distributor_check": {
"checked_at": "2026-10-29T03:25:44Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": "448-CYW20721B2KUMLGTTR-ND",
"status": "found",
"lifecycle": "Active"
},
"mouser": {
"pn": "727-CYW20721B2KUMLGT",
"status": "found"
}
},
"pins": [
{
"number": "1",
"name": "P28",
"type": "bidirectional",
"description": "GPIO P28 with A/D converter input 11 and 16 mA sink current; supermux-programmable to the alternate functions in Tables 6 and 7."
},
{
"number": "2",
"name": "P29",
"type": "bidirectional",
"description": "GPIO P29 with A/D converter input 10 and 16 mA sink current; supermux-programmable to the alternate functions in Tables 6 and 7."
},
{
"number": "3",
"name": "P0",
"type": "bidirectional",
"description": "GPIO P0 that also serves as keyboard scan input KSI0 and A/D converter input 29; supermux I/O functions as defined in Table 6."
},
{
"number": "4",
"name": "P1",
"type": "bidirectional",
"description": "GPIO P1 that also serves as keyboard scan input KSI1 and A/D converter input 28; supermux I/O functions as defined in Table 6."
},
{
"number": "5",
"name": "P34",
"type": "bidirectional",
"description": "GPIO P34 with A/D converter input 5; supermux I/O functions as defined in Table 6."
},
{
"number": "6",
"name": "P38",
"type": "bidirectional",
"description": "GPIO P38 with A/D converter input 1; supermux I/O functions as defined in Table 6."
},
{
"number": "7",
"name": "P26",
"type": "bidirectional",
"description": "GPIO P26 with 16 mA sink current; supermux I/O functions as defined in Table 6."
},
{
"number": "8",
"name": "P25",
"type": "bidirectional",
"description": "GPIO P25; supermux I/O functions as defined in Table 6."
},
{
"number": "9",
"name": "P33",
"type": "bidirectional",
"description": "GPIO P33 with A/D converter input 6; supermux I/O functions as defined in Table 6."
},
{
"number": "10",
"name": "RST_N",
"type": "input",
"description": "Active-low system reset input with internal pull-up resistor; I/O power domain VDDO."
},
{
"number": "11",
"name": "JTAG_SEL",
"type": "passive",
"description": "Reserved Arm JTAG debug mode control; connect to GND for all applications."
},
{
"number": "12",
"name": "SR_VLX",
"type": "power_out",
"description": "Core buck regulator output."
},
{
"number": "13",
"name": "SR_VDDBAT3V",
"type": "power_in",
"description": "Core buck input supply."
},
{
"number": "14",
"name": "RFLDO_VDDOUT",
"type": "power_out",
"description": "RF LDO output."
},
{
"number": "15",
"name": "RFLDO_VDDIN",
"type": "power_in",
"description": "RF LDO input."
},
{
"number": "16",
"name": "DIGLDO_VDDIN",
"type": "power_in",
"description": "Internal digital LDO input."
},
{
"number": "17",
"name": "BT_PAVDD",
"type": "power_in",
"description": "PA supply."
},
{
"number": "18",
"name": "BT_RF",
"type": "passive",
"description": "RF antenna port."
},
{
"number": "19",
"name": "BT_IFVDD1P2",
"type": "power_in",
"description": "IFPLL power supply (1.2 V domain)."
},
{
"number": "20",
"name": "BT_VCOVDD1P2",
"type": "power_in",
"description": "VCO supply (1.2 V domain)."
},
{
"number": "21",
"name": "BT_PLLVDD1P2",
"type": "power_in",
"description": "RFPLL and crystal oscillator supply (1.2 V domain)."
},
{
"number": "22",
"name": "BT_XTALI",
"type": "input",
"description": "Crystal oscillator input; the XTAL must have an accuracy of ±20 ppm per the Bluetooth specification and two external load capacitors are required, selected per the XTAL (see Figure 2)."
},
{
"number": "23",
"name": "BT_XTALO",
"type": "output",
"description": "Crystal oscillator output."
},
{
"number": "24",
"name": "BT_HOST_WAKE",
"type": "output",
"description": "Signal from the CYW20721 to the host indicating that the Bluetooth device requires attention; I/O power domain VDDO."
},
{
"number": "25",
"name": "BT_VDDO",
"type": "power_in",
"description": "I/O pad power supply; I/O power domain VDDO."
},
{
"number": "26",
"name": "Reserved",
"type": "unconnected",
"description": "Reserved; leave unconnected."
},
{
"number": "27",
"name": "BT_UART_RXD",
"type": "input",
"description": "UART serial input; serial data input for the HCI UART interface, I/O power domain VDDO."
},
{
"number": "28",
"name": "BT_UART_TXD",
"type": "output",
"description": "UART serial output; serial data output for the HCI UART interface, with pull-up (PU) on the I/O power domain VDDO."
},
{
"number": "29",
"name": "BT_UART_RTS_N",
"type": "output",
"description": "Request to send (RTS) for the HCI UART interface, with pull-up (PU); leave unconnected if not used."
},
{
"number": "30",
"name": "BT_UART_CTS_N",
"type": "input",
"description": "Clear to send (CTS) for the HCI UART interface, with pull-up (PU); leave unconnected if not used."
},
{
"number": "31",
"name": "XTALO_32K",
"type": "output",
"description": "Low-power oscillator output; I/O power domain VDDO."
},
{
"number": "32",
"name": "XTALI_32K / P15",
"type": "input",
"description": "Low-power oscillator input (XTALI_32K) that is shared with GPIO P15 (A/D converter input 20); P15 should not be driven high externally while the part is held in reset."
},
{
"number": "33",
"name": "P16",
"type": "bidirectional",
"description": "GPIO P16 with A/D converter input 19; supermux I/O functions as defined in Table 6."
},
{
"number": "34",
"name": "P2",
"type": "bidirectional",
"description": "GPIO P2 with keyboard scan input KSI2; supermux I/O functions as defined in Table 6."
},
{
"number": "35",
"name": "P4",
"type": "bidirectional",
"description": "GPIO P4 with keyboard scan input KSI4; supermux I/O functions as defined in Table 6."
},
{
"number": "36",
"name": "P6",
"type": "bidirectional",
"description": "GPIO P6 with keyboard scan input KSI6; supermux I/O functions as defined in Table 6."
},
{
"number": "37",
"name": "P7",
"type": "bidirectional",
"description": "GPIO P7 with keyboard scan input KSI7; supermux I/O functions as defined in Table 6."
},
{
"number": "38",
"name": "P17",
"type": "bidirectional",
"description": "GPIO P17 with A/D converter input 18; supermux I/O functions as defined in Table 6."
},
{
"number": "39",
"name": "VDDO",
"type": "power_in",
"description": "LHL pad power supply; can be tied to BT_VDDO."
},
{
"number": "40",
"name": "P10",
"type": "bidirectional",
"description": "GPIO P10 with keyboard scan output KSO2 and A/D converter input 25; supermux I/O functions as defined in Table 6."
},
{
"number": "41",
"name": "EP",
"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: MPN suffix mismatch: the requested MPN is CYW20721B2KUMLGT, but the ordering table (Table 30, page 4; Pin 32 is a shared pin: Table 4 lists it as XTALI_32K and Table 5 as P15 (figure 6 labels it xtali_3; The QFN exposed center pad (VSS, 'connect to ground') has no pin number printed on the package, so i",
"exposed pad 41 added from the footprint"
],
"pages_sent": 18,
"cost_usd": 0.1112,
"at": "2026-10-29T03:25:29"
},
"datasheet": {
"url": "https://datasheet.lcsc.com/datasheet/pdf/95968376246a64ea802ccc8e34688ba5.pdf",
"pages": 47,
"sha256": "b8098c691c998147",
"source_tier": "mfr"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 41,
"described": 41,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
{
"file": "cyw20721b2kumlgt.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
5,
5,
0.77
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "8f37bc7a9aab4742c34f137d9822c0352acc227532830034555744338483cdfc",
"checked": "2026-10-29",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "cyw20721b2kumlgt-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
5,
5,
0.77
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "5c6c504427370da784f9d3b98bd3355d9fdcb7da96328324bdb29ff4ffd25bb0",
"checked": "2026-10-29",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
]
},
"metadata": {
"specs": {
"Manufacturer": "Infineon Technologies",
"Package": "QFN-40(5x5)",
"Category": "Radio Frequency Chip/Antenna",
"Pins": "41"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "b8098c691c998147741955906e5540e8585128f5096b331c025e7622ca5e16f3",
"rows": [
{
"name": "Maximum Junction Temperature",
"symbol": "",
"kind": "absolute_maximum",
"unit": "°C",
"min": null,
"typ": null,
"max": 125,
"conditions": "",
"source_page": 29,
"source": "datasheet"
},
{
"name": "VDD IO (BT_VDDO, VDDO_0)",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.5,
"typ": null,
"max": 3.795,
"conditions": "",
"source_page": 29,
"source": "datasheet"
},
{
"name": "VDD RF (BT_IFVDD1p2, BT_PLLVDD1p2, BT_VCOVDD1p2, BT_PAVDD)",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.5,
"typ": null,
"max": 1.38,
"conditions": "",
"source_page": 29,
"source": "datasheet"
},
{
"name": "VDDBAT3V/SR_VDDBAT3V",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.5,
"typ": null,
"max": 3.795,
"conditions": "",
"source_page": 29,
"source": "datasheet"
},
{
"name": "DIGLDO_VDDIN1P5",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.5,
"typ": null,
"max": 1.65,
"conditions": "",
"source_page": 29,
"source": "datasheet"
},
{
"name": "RFLDO_VDDIN1P5",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.5,
"typ": null,
"max": 1.5,
"conditions": "",
"source_page": 29,
"source": "datasheet"
},
{
"name": "MIC_AVDD",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.5,
"typ": null,
"max": 3.795,
"conditions": "",
"source_page": 29,
"source": "datasheet"
},
{
"name": "BT_RF",
"symbol": "",
"kind": "absolute_maximum",
"unit": "dBm",
"min": null,
"typ": null,
"max": 0,
"conditions": "",
"source_page": 29,
"source": "datasheet"
},
{
"name": "ESD Tolerance HBM",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": -2000,
"typ": null,
"max": 2000,
"conditions": "",
"source_page": 29,
"source": "datasheet"
},
{
"name": "ESD Tolerance CDM",
"symbol": "",
"kind": "absolute_maximum",
"unit": "V",
"min": -500,
"typ": null,
"max": 500,
"conditions": "",
"source_page": 29,
"source": "datasheet"
},
{
"name": "Operating Temperature",
"symbol": "",
"kind": "recommended_operating",
"unit": "°C",
"min": -30,
"typ": null,
"max": 85,
"conditions": "",
"source_page": 29,
"source": "datasheet"
},
{
"name": "Storage Temperature",
"symbol": "",
"kind": "absolute_maximum",
"unit": "°C",
"min": -40,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 29,
"source": "datasheet"
},
{
"name": "VDDIO (BT_VDDO, VDDO_0)",
"symbol": "",
"kind": "recommended_operating",
"unit": "V",
"min": 1.76,
"typ": 3,
"max": 3.63,
"conditions": "",
"source_page": 29,
"source": "datasheet"
},
{
"name": "VDDBAT3V/SR_VDDBAT3V",
"symbol": "",
"kind": "recommended_operating",
"unit": "V",
"min": 1.76,
"typ": 3,
"max": 3.63,
"conditions": "",
"source_page": 29,
"source": "datasheet"
},
{
"name": "MIC_AVDD",
"symbol": "",
"kind": "recommended_operating",
"unit": "V",
"min": 1.76,
"typ": 3,
"max": 3.63,
"conditions": "",
"source_page": 29,
"source": "datasheet"
},
{
"name": "Input supply voltage (Core Buck Regulator)",
"symbol": "",
"kind": "electrical",
"unit": "V",
"min": 1.76,
"typ": 3,
"max": 3.63,
"conditions": "DC, VBAT DC voltage range inclusive of disturbances",
"source_page": 30,
"source": "datasheet"
},
{
"name": "CBUCK output current",
"symbol": "",
"kind": "electrical",
"unit": "mA",
"min": null,
"typ": null,
"max": 65,
"conditions": "Low Power Operation Mode (LPOM) only",
"source_page": 30,
"source": "datasheet"
},
{
"name": "Output voltage range (Core Buck)",
"symbol": "",
"kind": "electrical",
"unit": "V",
"min": 1.2,
"typ": 1.26,
"max": 1.5,
"conditions": "Programmable, 30mV/step default = 1.2 V (bits = 0000)",
"source_page": 30,
"source": "datasheet"
},
{
"name": "Output voltage DC accuracy (Core Buck)",
"symbol": "",
"kind": "tolerance",
"unit": "%",
"min": -4,
"typ": null,
"max": 4,
"conditions": "Includes load and line regulation",
"source_page": 30,
"source": "datasheet"
},
{
"name": "Input supply voltage ramp-up time",
"symbol": "",
"kind": "timing",
"unit": "μs",
"min": 40,
"typ": null,
"max": null,
"conditions": "0 to 3.3 V",
"source_page": 30,
"source": "datasheet"
},
{
"name": "Input low voltage",
"symbol": "VIL",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.8,
"conditions": "VDDO = 3 V",
"source_page": 31,
"source": "datasheet"
},
{
"name": "Input high voltage",
"symbol": "VIH",
"kind": "electrical",
"unit": "V",
"min": 2.4,
"typ": null,
"max": null,
"conditions": "VDDO = 3 V",
"source_page": 31,
"source": "datasheet"
},
{
"name": "Input low voltage",
"symbol": "VIL",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.4,
"conditions": "VDDO = 1.8 V",
"source_page": 31,
"source": "datasheet"
},
{
"name": "Input high voltage",
"symbol": "VIH",
"kind": "electrical",
"unit": "V",
"min": 1.4,
"typ": null,
"max": null,
"conditions": "VDDO = 1.8 V",
"source_page": 31,
"source": "datasheet"
},
{
"name": "Output low voltage",
"symbol": "VOL",
"kind": "electrical",
"unit": "V",
"min": null,
"typ": null,
"max": 0.45,
"conditions": "",
"source_page": 31,
"source": "datasheet"
},
{
"name": "Input low current",
"symbol": "IIL",
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