component
AT32F421K8U7
Public Made by Adomby adom
ARTERY Microcontrollers (MCU/MPU/SOC), QFN-32(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": "at32f421k8u7",
"title": "AT32F421K8U7",
"brief": "ARTERY Microcontrollers (MCU/MPU/SOC), QFN-32(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",
"embedded processors & controllers",
"at32f421k8u7",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "AT32F421K8U7",
"manufacturer": "ARTERY",
"package": "QFN-32(5x5)",
"pin_count": 33,
"category": "Embedded Processors & Controllers",
"subcategory": "Microcontrollers (MCU/MPU/SOC)",
"datasheet": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588954980052553728",
"parts": {
"symbol": "at32f421k8u7.kicad_sym",
"footprint": "at32f421k8u7.kicad_mod",
"model_3d": "at32f421k8u7-hero.glb",
"model_3d_plain": "at32f421k8u7-etched.glb",
"model_3d_step": "at32f421k8u7-etched.step",
"model_3d_step_plain": "at32f421k8u7.step",
"lbr": "at32f421k8u7.lbr"
},
"distributor_links": {
"lcsc": "C2965611"
},
"distributor_check": {
"checked_at": "2026-10-17T06:26:32Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": null,
"status": "no match"
},
"mouser": {
"pn": null,
"status": "no match"
}
},
"pins": [
{
"number": "1",
"name": "VDD",
"type": "power_in",
"description": "Digital power supply."
},
{
"number": "2",
"name": "PF0 / HEXT_IN",
"type": "bidirectional",
"description": "General I/O (TC standard level) with alternate function I2C1_SDA and additional function HEXT_IN, the 4 to 25 MHz external crystal input."
},
{
"number": "3",
"name": "PF1 / HEXT_OUT",
"type": "bidirectional",
"description": "General I/O (TC standard level) with alternate function I2C1_SCL and additional function HEXT_OUT, the external crystal output."
},
{
"number": "4",
"name": "NRST",
"type": "bidirectional",
"description": "Device reset input and internal reset output, active low, with an embedded weak pull-up resistor."
},
{
"number": "5",
"name": "VDDA / VREF+",
"type": "power_in",
"description": "Analog power supply and positive reference voltage for the ADC."
},
{
"number": "6",
"name": "PA0",
"type": "bidirectional",
"description": "5 V-tolerant analog-capable I/O (FTa) with ADC1_IN0, CMP1_INP2, CMP1_INM6, WKUP1, and alternate functions TMR1_EXT, USART2_CTS, I2C2_SCL and CMP1_OUT; it loses 5 V tolerance in analog mode, where the input must stay below VDD + 0.3 V."
},
{
"number": "7",
"name": "PA1",
"type": "bidirectional",
"description": "5 V-tolerant analog-capable I/O (FTa) with ADC1_IN1 and CMP1_INP1, and alternate functions TMR15_CH1C, USART2_RTS, I2C2_SDA and EVENTOUT; the input must stay below VDD + 0.3 V in analog mode."
},
{
"number": "8",
"name": "PA2",
"type": "bidirectional",
"description": "5 V-tolerant analog-capable I/O (FTa) with ADC1_IN2 and CMP1_INM7, and alternate functions TMR15_CH1 and USART2_TX (bootloader USART2 TX); the input must stay below VDD + 0.3 V in analog mode."
},
{
"number": "9",
"name": "PA3",
"type": "bidirectional",
"description": "5 V-tolerant analog-capable I/O (FTa) with ADC1_IN3, and alternate functions TMR15_CH2, USART2_RX and I2S2_MCK (bootloader USART2 RX); the input must stay below VDD + 0.3 V in analog mode."
},
{
"number": "10",
"name": "PA4",
"type": "bidirectional",
"description": "5 V-tolerant analog-capable I/O (FTa) with ADC1_IN4 and CMP1_INM4, and alternate functions TMR14_CH1, USART2_CK, SPI1_CS and I2S1_WS; the input must stay below VDD + 0.3 V in analog mode."
},
{
"number": "11",
"name": "PA5",
"type": "bidirectional",
"description": "5 V-tolerant analog-capable I/O (FTa) with ADC1_IN5, CMP1_INP0 and CMP1_INM5, and alternate functions SPI1_SCK and I2S1_CK; the input must stay below VDD + 0.3 V in analog mode."
},
{
"number": "12",
"name": "PA6",
"type": "bidirectional",
"description": "5 V-tolerant analog-capable I/O (FTa) with ADC1_IN6, and alternate functions TMR1_BRK, TMR3_CH1, TMR16_CH1, SPI1_MISO, I2S1_MCK, I2S2_MCK, CMP1_OUT and EVENTOUT; the input must stay below VDD + 0.3 V in analog mode."
},
{
"number": "13",
"name": "PA7",
"type": "bidirectional",
"description": "5 V-tolerant analog-capable I/O (FTa) with ADC1_IN7, and alternate functions TMR1_CH1C, TMR3_CH2, TMR14_CH1, TMR17_CH1, SPI1_MOSI, I2S1_SD and EVENTOUT; the input must stay below VDD + 0.3 V in analog mode."
},
{
"number": "14",
"name": "PB0",
"type": "bidirectional",
"description": "5 V-tolerant analog-capable I/O (FTa) with ADC1_IN8, and alternate functions TMR1_CH2C, TMR3_CH3, USART2_RX, I2S1_MCK and EVENTOUT; the input must stay below VDD + 0.3 V in analog mode."
},
{
"number": "15",
"name": "PB1",
"type": "bidirectional",
"description": "5 V-tolerant analog-capable I/O (FTa) with ADC1_IN9, and alternate functions TMR1_CH3C, TMR3_CH4, TMR14_CH1, SPI2_SCK and I2S2_CK; the input must stay below VDD + 0.3 V in analog mode."
},
{
"number": "16",
"name": "PB2",
"type": "bidirectional",
"description": "5 V-tolerant analog-capable I/O (FTa) with ADC1_IN10 and alternate function TMR3_EXT; the input must stay below VDD + 0.3 V in analog mode."
},
{
"number": "17",
"name": "VDD",
"type": "power_in",
"description": "Digital power supply."
},
{
"number": "18",
"name": "PA8",
"type": "bidirectional",
"description": "5 V-tolerant general-purpose I/O (FT) with alternate functions TMR1_CH1, USART1_CK, USART2_TX, I2C2_SCL, CLKOUT and EVENTOUT."
},
{
"number": "19",
"name": "PA9",
"type": "bidirectional",
"description": "5 V-tolerant general-purpose I/O (FT) with alternate functions TMR1_CH2, TMR15_BRK, USART1_TX (bootloader USART1 TX), I2C1_SCL, I2C2_SMBA and CLKOUT."
},
{
"number": "20",
"name": "PA10",
"type": "bidirectional",
"description": "5 V-tolerant general-purpose I/O (FT) with alternate functions TMR1_CH3, TMR17_BRK, USART1_RX (bootloader USART1 RX) and I2C1_SDA."
},
{
"number": "21",
"name": "PA11",
"type": "bidirectional",
"description": "5 V-tolerant general-purpose I/O (FT) with alternate functions TMR1_CH4, USART1_CTS, I2C1_SMBA, I2C2_SCL, CMP1_OUT and EVENTOUT."
},
{
"number": "22",
"name": "PA12",
"type": "bidirectional",
"description": "5 V-tolerant general-purpose I/O (FT) with alternate functions TMR1_EXT, USART1_RTS, I2C2_SDA and EVENTOUT."
},
{
"number": "23",
"name": "PA13",
"type": "bidirectional",
"description": "5 V-tolerant general-purpose I/O (FT) that is configured as SWDIO after reset, with an internal pull-up enabled on SWDIO; alternate functions include IR_OUT, SPI2_MISO and I2S2_MCK."
},
{
"number": "24",
"name": "PA14",
"type": "bidirectional",
"description": "5 V-tolerant general-purpose I/O (FT) that is configured as SWCLK after reset, with an internal pull-down enabled on SWCLK; alternate functions include USART2_TX, SPI2_MOSI and I2S2_SD."
},
{
"number": "25",
"name": "PA15",
"type": "bidirectional",
"description": "5 V-tolerant general-purpose I/O (FT) with alternate functions USART2_RX, SPI1_CS, I2S1_WS, SPI2_CS, I2S2_WS and EVENTOUT."
},
{
"number": "26",
"name": "PB3",
"type": "bidirectional",
"description": "5 V-tolerant general-purpose I/O (FT) with alternate functions SPI1_SCK, I2S1_CK, SPI2_SCK, I2S2_CK and EVENTOUT."
},
{
"number": "27",
"name": "PB4",
"type": "bidirectional",
"description": "5 V-tolerant general-purpose I/O (FT) with alternate functions TMR3_CH1, TMR17_BRK, SPI1_MISO, I2S1_MCK, SPI2_MISO, I2S2_MCK, I2C2_SDA and EVENTOUT."
},
{
"number": "28",
"name": "PB5",
"type": "bidirectional",
"description": "5 V-tolerant general-purpose I/O (FT) with alternate functions TMR3_CH2, TMR16_BRK, SPI1_MOSI, I2S1_SD, SPI2_MOSI, I2S2_SD and I2C1_SMBA, and additional function WKUP6."
},
{
"number": "29",
"name": "PB6",
"type": "bidirectional",
"description": "5 V-tolerant general-purpose I/O (FT) with alternate functions TMR16_CH1C, USART1_TX, I2S1_MCK and I2C1_SCL."
},
{
"number": "30",
"name": "PB7",
"type": "bidirectional",
"description": "5 V-tolerant general-purpose I/O (FT) with alternate functions TMR17_CH1C, USART1_RX and I2C1_SDA."
},
{
"number": "31",
"name": "BOOT0",
"type": "input",
"description": "Dedicated boot mode selection pin 0 with an embedded weak pull-down resistor."
},
{
"number": "32",
"name": "PB8",
"type": "bidirectional",
"description": "5 V-tolerant general-purpose I/O (FT) with alternate functions TMR16_CH1 and I2C1_SCL."
},
{
"number": "33",
"name": "EPAD (VSS/VSSA)",
"type": "power_in",
"description": "Exposed pad serving as the digital ground and analog ground for the package."
}
],
"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: Table 5 lists no separate VSS pin for the QFN32 column; the only ground pad for this package is the ; Figure 4 (QFN32 pinout) is partially garbled in the text extraction and labels a VDD near pin 33, wh; The MPN AT32F421K8U7 has no -4 suffix, so it is the QFN32 5x5 mm variant per the part numbering tabl"
],
"pages_sent": 24,
"cost_usd": 0.1236,
"at": "2026-10-17T06:24:44"
},
"datasheet": {
"url": "https://jlcpcb.com/api/file/downloadByFileSystemAccessId/8588954980052553728",
"pages": 73,
"sha256": "549f03d7f8d31eb7",
"source_tier": "lcsc"
},
"cad": "KiCad official (CC-BY-SA 4.0)",
"pins": {
"total": 33,
"described": 33,
"cites_pages": true,
"refuses_to_fabricate": true
}
},
"viewers": {
"symbol": "viewers/symbol.html",
"footprint": "viewers/footprint.html"
},
"models_3d": [
{
"file": "at32f421k8u7.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
5,
5,
0.875
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "5fa713ea46b36980895812ed853577889b7cb06d275041a39b99bc0be305dc79",
"checked": "2026-10-17",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "at32f421k8u7-etched.step",
"role": "eda",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
5,
5,
0.875
],
"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "674d79e21ea6450338c72ae0d897e8afd022574333d2ef62055d3d4b0d5c3a92",
"checked": "2026-10-17",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
]
},
"metadata": {
"specs": {
"Manufacturer": "ARTERY",
"Package": "QFN-32(5x5)",
"Category": "Embedded Processors & Controllers",
"Pins": "33"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "549f03d7f8d31eb7b51fa9ffd782a8e8ac2b2aa9a5c0e130bed852370ee1b3ed",
"rows": [
{
"name": "External main supply voltage (including VDDA and VDD)",
"symbol": "VDD-VSS",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 4,
"conditions": "",
"source_page": 27,
"source": "datasheet"
},
{
"name": "Input voltage on FTa GPIO (set as input floating, input pull-up or input pull-down mode)",
"symbol": "VIN",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 6,
"conditions": "set as input floating, input pull-up or input pull-down mode",
"source_page": 27,
"source": "datasheet"
},
{
"name": "Input voltage on TC GPIO",
"symbol": "VIN",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 4,
"conditions": "",
"source_page": 27,
"source": "datasheet"
},
{
"name": "Input voltage on FTa GPIO (set as analog mode)",
"symbol": "VIN",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 4,
"conditions": "set as analog mode",
"source_page": 27,
"source": "datasheet"
},
{
"name": "Variations between different VDD power pins",
"symbol": "|ΔVDDx|",
"kind": "absolute_maximum",
"unit": "mV",
"min": null,
"typ": null,
"max": 50,
"conditions": "",
"source_page": 27,
"source": "datasheet"
},
{
"name": "Variations between all the different ground pins",
"symbol": "|VSSx-VSS|",
"kind": "absolute_maximum",
"unit": "mV",
"min": null,
"typ": null,
"max": 50,
"conditions": "",
"source_page": 27,
"source": "datasheet"
},
{
"name": "Total current into VDD power lines (source)",
"symbol": "IVDD",
"kind": "absolute_maximum",
"unit": "mA",
"min": null,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 27,
"source": "datasheet"
},
{
"name": "Total current out of VSS ground lines (sink)",
"symbol": "IVSS",
"kind": "absolute_maximum",
"unit": "mA",
"min": null,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 27,
"source": "datasheet"
},
{
"name": "Output current sunk by any GPIO and control pin",
"symbol": "IIO",
"kind": "absolute_maximum",
"unit": "mA",
"min": null,
"typ": null,
"max": 25,
"conditions": "",
"source_page": 27,
"source": "datasheet"
},
{
"name": "Output current source by any GPIO and control pin",
"symbol": "IIO",
"kind": "absolute_maximum",
"unit": "mA",
"min": null,
"typ": null,
"max": -25,
"conditions": "",
"source_page": 27,
"source": "datasheet"
},
{
"name": "Storage temperature range",
"symbol": "TSTG",
"kind": "absolute_maximum",
"unit": "°C",
"min": -60,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 27,
"source": "datasheet"
},
{
"name": "Maximum junction temperature",
"symbol": "TJ",
"kind": "absolute_maximum",
"unit": "°C",
"min": null,
"typ": null,
"max": 125,
"conditions": "",
"source_page": 27,
"source": "datasheet"
},
{
"name": "Electrostatic discharge voltage (human body model)",
"symbol": "VESD(HBM)",
"kind": "absolute_maximum",
"unit": "V",
"min": -6000,
"typ": null,
"max": 6000,
"conditions": "TA = +25 °C, conforms to JS-001-2017",
"source_page": 28,
"source": "datasheet"
},
{
"name": "Electrostatic discharge voltage (charge device model)",
"symbol": "VESD(CDM)",
"kind": "absolute_maximum",
"unit": "V",
"min": -1000,
"typ": null,
"max": 1000,
"conditions": "TA = +25 °C, conforms to JS-002-2018",
"source_page": 28,
"source": "datasheet"
},
{
"name": "Internal AHB clock frequency",
"symbol": "fHCLK",
"kind": "recommended_operating",
"unit": "MHz",
"min": 0,
"typ": null,
"max": 120,
"conditions": "",
"source_page": 29,
"source": "datasheet"
},
{
"name": "Internal APB1/2 clock frequency",
"symbol": "fPCLK1/2",
"kind": "recommended_operating",
"unit": "MHz",
"min": 0,
"typ": null,
"max": null,
"conditions": "",
"source_page": 29,
"source": "datasheet"
},
{
"name": "Digital operating voltage",
"symbol": "VDD",
"kind": "recommended_operating",
"unit": "V",
"min": 2.4,
"typ": null,
"max": 3.6,
"conditions": "",
"source_page": 29,
"source": "datasheet"
},
{
"name": "Power dissipation QFN32 (5 x 5 mm)",
"symbol": "PD",
"kind": "recommended_operating",
"unit": "mW",
"min": null,
"typ": null,
"max": 503,
"conditions": "TA = 105 °C",
"source_page": 29,
"source": "datasheet"
},
{
"name": "Ambient temperature",
"symbol": "TA",
"kind": "recommended_operating",
"unit": "°C",
"min": -40,
"typ": null,
"max": 105,
"conditions": "",
"source_page": 29,
"source": "datasheet"
},
{
"name": "VDD rise time rate",
"symbol": "tVDD",
"kind": "timing",
"unit": "ms/V",
"min": 0,
"typ": null,
"max": null,
"conditions": "",
"source_page": 29,
"source": "datasheet"
},
{
"name": "VDD fall time rate",
"symbol": "",
"kind": "timing",
"unit": "μs/V",
"min": 20,
"typ": null,
"max": null,
"conditions": "",
"source_page": 29,
"source": "datasheet"
},
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