component
USB3503T-I
Public Made by Adomby adom
Microchip Tech USB ICs, QFN-32-EP(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": "usb3503t-i",
"title": "USB3503T-I",
"brief": "Microchip Tech USB ICs, QFN-32-EP(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",
"communication interface chip-uart-485-232",
"usb3503t-i",
"factory-2.0.0",
"extractor-text"
],
"component": {
"mpn": "USB3503T-I",
"manufacturer": "Microchip Tech",
"package": "QFN-32-EP(5x5)",
"pin_count": 33,
"category": "Communication Interface Chip/UART/485/232",
"subcategory": "USB ICs",
"datasheet": "https://datasheet.lcsc.com/datasheet/pdf/022a28dc22f08ca8bc35648566668bb7.pdf",
"parts": {
"symbol": "usb3503t-i.kicad_sym",
"footprint": "usb3503t-i.kicad_mod",
"model_3d": "usb3503t-i-hero.glb",
"model_3d_plain": "usb3503t-i-etched.glb",
"model_3d_step": "usb3503t-i-etched.step",
"model_3d_step_plain": "usb3503t-i.step",
"lbr": "usb3503t-i.lbr"
},
"distributor_links": {
"lcsc": "C622624"
},
"distributor_check": {
"checked_at": "2026-10-30T20:38:50Z",
"source": "Component Ocean /api/assign-pns",
"digikey": {
"pn": null,
"status": "no match"
},
"mouser": {
"pn": null,
"status": "no match"
}
},
"pins": [
{
"number": "1",
"name": "OCS_N",
"type": "input",
"description": "Over Current Sense input from an external current monitor for port 3 or a ganged supply; negated high = no fault, asserted low = over-current fault reported."
},
{
"number": "2",
"name": "HUB_CONNECT",
"type": "input",
"description": "Hub moves to the Hub Communication Stage when this pin is asserted high; tie to ground to wait for the connect_n bit, tie to VDD33_BYP for automatic transition, or drive low-to-high, and never drive high in Standby Mode."
},
{
"number": "3",
"name": "NC",
"type": "unconnected",
"description": "No connect."
},
{
"number": "4",
"name": "PRTPWR",
"type": "output",
"description": "Open-drain port power control output for port 3 or a ganged supply; asserted high = external device should provide power, negated low = external device should disable power."
},
{
"number": "5",
"name": "INT_N",
"type": "output",
"description": "Open-drain active-low interrupt whose function is set by CFGP.INTSUSP (general interrupt or USB suspend indication); also sampled during Hub.Init to select primary (high) or secondary (low) REFCLK frequencies, and tied to VDD33_BYP if unused."
},
{
"number": "6",
"name": "VDD12_BYP",
"type": "power_out",
"description": "1.2 V regulator output requiring a 1.0 uF (<1 ohm ESR) capacitor to ground placed as close as possible to the device."
},
{
"number": "7",
"name": "SDA",
"type": "bidirectional",
"description": "I2C serial data, open-drain I/O."
},
{
"number": "8",
"name": "SCL",
"type": "input",
"description": "I2C serial clock input."
},
{
"number": "9",
"name": "REF_SEL1",
"type": "input",
"description": "Reference clock select 1, tied to ground or VDD33_BYP to match the REFCLK frequency per Table 3-3/3-4 and latched during Hub.Init."
},
{
"number": "10",
"name": "REF_SEL0",
"type": "input",
"description": "Reference clock select 0, tied to ground or VDD33_BYP to match the REFCLK frequency per Table 3-3/3-4 and latched during Hub.Init."
},
{
"number": "11",
"name": "VDD12_BYP",
"type": "power_out",
"description": "1.2 V regulator output requiring a 1.0 uF (<1 ohm ESR) capacitor to ground placed as close as possible to the device."
},
{
"number": "12",
"name": "RESET_N",
"type": "input",
"description": "Active-low reset that resets the chip and holds it in low power STANDBY MODE."
},
{
"number": "13",
"name": "VDD12_BYP",
"type": "power_out",
"description": "1.2 V regulator output requiring a 1.0 uF (<1 ohm ESR) capacitor to ground placed as close as possible to the device."
},
{
"number": "14",
"name": "NC",
"type": "unconnected",
"description": "No connect."
},
{
"number": "15",
"name": "DATA",
"type": "bidirectional",
"description": "Upstream HSIC DATA pin of the hub."
},
{
"number": "16",
"name": "STROBE",
"type": "bidirectional",
"description": "Upstream HSIC STROBE pin of the hub."
},
{
"number": "17",
"name": "NC",
"type": "unconnected",
"description": "No connect."
},
{
"number": "18",
"name": "NC",
"type": "unconnected",
"description": "No connect."
},
{
"number": "19",
"name": "USBDN3_DM",
"type": "bidirectional",
"description": "USB downstream port 3 D- data pin; there is no port disable strap option on this port."
},
{
"number": "20",
"name": "USBDN3_DP",
"type": "bidirectional",
"description": "USB downstream port 3 D+ data pin; there is no port disable strap option on this port."
},
{
"number": "21",
"name": "USBDN2_DM",
"type": "bidirectional",
"description": "USB downstream port 2 D- data pin; sampled at RESET_N negation and tied with D+ to VDD33_BYP to disable the port."
},
{
"number": "22",
"name": "USBDN2_DP",
"type": "bidirectional",
"description": "USB downstream port 2 D+ data pin; sampled at RESET_N negation and tied with D- to VDD33_BYP to disable the port."
},
{
"number": "23",
"name": "USBDN1_DM",
"type": "bidirectional",
"description": "USB downstream port 1 D- data pin; sampled at RESET_N negation and tied with D+ to VDD33_BYP to disable the port."
},
{
"number": "24",
"name": "USBDN1_DP",
"type": "bidirectional",
"description": "USB downstream port 1 D+ data pin; sampled at RESET_N negation and tied with D- to VDD33_BYP to disable the port."
},
{
"number": "25",
"name": "VBAT",
"type": "power_in",
"description": "Battery power supply input; see Section 9.0 for power supply configuration options."
},
{
"number": "26",
"name": "VDD33_BYP",
"type": "power_out",
"description": "3.3 V regulator output requiring a 4.7 uF (<1 ohm ESR) capacitor to ground placed as close as possible to the device."
},
{
"number": "27",
"name": "NC",
"type": "unconnected",
"description": "No connect."
},
{
"number": "28",
"name": "VDD_CORE_REG",
"type": "power_in",
"description": "Power supply input to the 1.2 V regulator for the digital core; connect to VDD33_BYP for single supply applications."
},
{
"number": "29",
"name": "REFCLK",
"type": "input",
"description": "Reference clock input driven with a square wave from 0 V to VDD33_BYP, using only the positive edge, with peak-to-peak jitter under 1 ns over 10 s."
},
{
"number": "30",
"name": "RBIAS",
"type": "passive",
"description": "Analog pin for a 12.0 kohm (+/-1%) resistor to ground that sets the USB transceiver internal bias."
},
{
"number": "31",
"name": "NC",
"type": "unconnected",
"description": "No connect."
},
{
"number": "32",
"name": "VDD33_BYP",
"type": "power_out",
"description": "3.3 V regulator output requiring a 4.7 uF (<1 ohm ESR) capacitor to ground placed as close as possible to the device."
},
{
"number": "33",
"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-sonnet-5-5",
"primary_mode": "text",
"consensus_model": "claude-sonnet-5-5",
"consensus": "agreed",
"guards": "pin_guards 0.1: passed",
"guard_notes": [
"extractor flagged: Exposed pad has no printed pin number (table says 'e-pad'); 'EP' used as the number. Confirm against; Open-drain pins (PRTPWR, INT_N, SDA) have no open-drain ERC class in the allowed set; PRTPWR and INT; Regulator output pins are typed power_out based on the bypass-capacitor description. The datasheet o",
"4/33 pins cited to the wrong page (name found elsewhere): ['6:VDD12_BYP@p12', '28:VDD_CORE_REG@p12', '29:REFCLK@p12', '32:VDD33_BYP@p12']"
],
"pages_sent": 24,
"cost_usd": 0.1877,
"at": "2026-10-30T20:38:42"
},
"datasheet": {
"url": "https://datasheet.lcsc.com/datasheet/pdf/022a28dc22f08ca8bc35648566668bb7.pdf",
"pages": 74,
"sha256": "262b302459ecd7f2",
"source_tier": "mfr"
},
"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": "usb3503t-i.step",
"role": "plain",
"up": "Z",
"units": "mm",
"origin": "footprint origin = pad-pattern centre",
"seat": "z = 0",
"extents_mm": [
5,
5,
0.875
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"zmin_mm": 0,
"centre_offset_mm": 0,
"footprint_binding": "identity",
"sha256": "5fa713ea46b36980895812ed853577889b7cb06d275041a39b99bc0be305dc79",
"checked": "2026-10-30",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
},
{
"file": "usb3503t-i-etched.step",
"role": "eda",
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"units": "mm",
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"seat": "z = 0",
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"footprint_binding": "identity",
"sha256": "2ce9920b1482d1c982fb662edb42d6921ceb90992c2a03de30d1387fe122e9bc",
"checked": "2026-10-30",
"checked_by": "factory/step_pose.py (Z-up, origin, seat, binding)"
}
]
},
"metadata": {
"specs": {
"Manufacturer": "Microchip Tech",
"Package": "QFN-32-EP(5x5)",
"Category": "Communication Interface Chip/UART/485/232",
"Pins": "33"
},
"characteristics": {
"version": 1,
"source": "datasheet",
"datasheet_sha256": "262b302459ecd7f2a2d358eb92ffa74cc378173fa8eedf4c545502257d6367af",
"rows": [
{
"name": "VBAT absolute max",
"symbol": "VBAT",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.5,
"typ": null,
"max": 5.5,
"conditions": "",
"source_page": 51,
"source": "datasheet"
},
{
"name": "VDD_CORE_REG absolute max",
"symbol": "VDD_CORE_REG",
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"unit": "V",
"min": -0.5,
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"max": 4.6,
"conditions": "",
"source_page": 51,
"source": "datasheet"
},
{
"name": "VDD33 absolute max",
"symbol": "VDD33_BYP",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.5,
"typ": null,
"max": 4.6,
"conditions": "",
"source_page": 51,
"source": "datasheet"
},
{
"name": "Maximum IO Voltage to Ground",
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"unit": "V",
"min": -0.5,
"typ": null,
"max": 4.6,
"conditions": "",
"source_page": 51,
"source": "datasheet"
},
{
"name": "REFCLK Voltage",
"symbol": "VMAX_REFCLK",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.5,
"typ": null,
"max": 3.6,
"conditions": "",
"source_page": 51,
"source": "datasheet"
},
{
"name": "Voltage on USB+ and USB- pins",
"symbol": "VMAX_USB",
"kind": "absolute_maximum",
"unit": "V",
"min": -0.5,
"typ": null,
"max": 5.5,
"conditions": "",
"source_page": 51,
"source": "datasheet"
},
{
"name": "Operating Temperature (Industrial)",
"symbol": "TMAX_OP",
"kind": "absolute_maximum",
"unit": "°C",
"min": -40,
"typ": null,
"max": 85,
"conditions": "Industrial",
"source_page": 51,
"source": "datasheet"
},
{
"name": "Storage Temperature",
"symbol": "TMAX_STG",
"kind": "absolute_maximum",
"unit": "°C",
"min": -55,
"typ": null,
"max": 150,
"conditions": "",
"source_page": 51,
"source": "datasheet"
},
{
"name": "Junction Temperature",
"symbol": "TJMAX",
"kind": "absolute_maximum",
"unit": "°C",
"min": null,
"typ": null,
"max": 125,
"conditions": "",
"source_page": 51,
"source": "datasheet"
},
{
"name": "VBAT supply",
"symbol": "VBAT",
"kind": "recommended_operating",
"unit": "V",
"min": 2.9,
"typ": null,
"max": 5.5,
"conditions": "",
"source_page": 51,
"source": "datasheet"
},
{
"name": "VDD_CORE_REG (external supply)",
"symbol": "VDD_CORE_REG",
"kind": "recommended_operating",
"unit": "V",
"min": 1.6,
"typ": 1.8,
"max": 2,
"conditions": "Note 10-1",
"source_page": 51,
"source": "datasheet"
},
{
"name": "VDD_CORE_REG (tied to VDD33_BYP)",
"symbol": "VDD_CORE_REG",
"kind": "recommended_operating",
"unit": "V",
"min": 3,
"typ": 3.3,
"max": 3.6,
"conditions": "Note 10-2",
"source_page": 51,
"source": "datasheet"
},
{
"name": "Input Voltage (DP, DM)",
"symbol": "VIUSB",
"kind": "recommended_operating",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 5.5,
"conditions": "",
"source_page": 51,
"source": "datasheet"
},
{
"name": "Input Voltage (STROBE, DATA)",
"symbol": "VIHSIC",
"kind": "recommended_operating",
"unit": "V",
"min": -0.3,
"typ": 1.2,
"max": 1.32,
"conditions": "",
"source_page": 51,
"source": "datasheet"
},
{
"name": "Input Voltage on I/O Pins",
"symbol": "VI",
"kind": "recommended_operating",
"unit": "V",
"min": -0.3,
"typ": 1.8,
"max": 3.6,
"conditions": "",
"source_page": 51,
"source": "datasheet"
},
{
"name": "Voltage on REFCLK",
"symbol": "VREFCLK",
"kind": "recommended_operating",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 3.6,
"conditions": "",
"source_page": 51,
"source": "datasheet"
},
{
"name": "Ambient Temperature (Industrial)",
"symbol": "TA",
"kind": "recommended_operating",
"unit": "°C",
"min": -40,
"typ": null,
"max": 85,
"conditions": "Industrial",
"source_page": 51,
"source": "datasheet"
},
{
"name": "Thermal resistance junction to ambient, 32-pin SQFN",
"symbol": "",
"kind": "thermal",
"unit": "°C/W",
"min": null,
"typ": 44,
"max": null,
"conditions": "Measured in still air",
"source_page": 52,
"source": "datasheet"
},
{
"name": "Thermal resistance junction to bottom of case, 32-pin SQFN",
"symbol": "",
"kind": "thermal",
"unit": "°C/W",
"min": null,
"typ": 0.6,
"max": null,
"conditions": "Measured in still air",
"source_page": 52,
"source": "datasheet"
},
{
"name": "Thermal resistance junction to top of case, 32-pin SQFN",
"symbol": "",
"kind": "thermal",
"unit": "°C/W",
"min": null,
"typ": 6.3,
"max": null,
"conditions": "",
"source_page": 52,
"source": "datasheet"
},
{
"name": "Operating current VBAT, HS, 3 ports active (dual supply)",
"symbol": "IVBAT(HS)",
"kind": "electrical",
"unit": "mA",
"min": 55,
"typ": 65,
"max": 68,
"conditions": "Active USB Transfer, RESET_N = 1, 3 Downstream Ports Active",
"source_page": 52,
"source": "datasheet"
},
{
"name": "Standby current VBAT, industrial (dual supply)",
"symbol": "IVBAT(STDBY)",
"kind": "electrical",
"unit": "µA",
"min": 0,
"typ": 0.6,
"max": 3.9,
"conditions": "RESET_N = 0, Industrial Temp",
"source_page": 53,
"source": "datasheet"
},
{
"name": "Standby current core, industrial (dual supply)",
"symbol": "ICORE(STDBY)",
"kind": "electrical",
"unit": "µA",
"min": 0,
"typ": 0,
"max": 0.9,
"conditions": "RESET_N = 0, Industrial Temp",
"source_page": 53,
"source": "datasheet"
},
{
"name": "Suspend current VBAT, industrial (dual supply)",
"symbol": "IVBAT(SPND)",
"kind": "electrical",
"unit": "µA",
"min": 65,
"typ": 73,
"max": 125,
"conditions": "USB Suspend, Industrial Temp",
"source_page": 53,
"source": "datasheet"
},
{
"name": "Suspend current core, industrial (dual supply)",
"symbol": "ICORE(SPND)",
"kind": "electrical",
"unit": "µA",
"min": 125,
"typ": 165,
"max": 1050,
"conditions": "USB Suspend, Industrial Temp",
"source_page": 53,
"source": "datasheet"
},
{
"name": "Operating current VBAT, HS, 3 ports active (single supply)",
"symbol": "IVBAT(HS)",
"kind": "electrical",
"unit": "mA",
"min": 88,
"typ": 98,
"max": 110,
"conditions": "Active USB Transfer, RESET_N = 1, 3 Downstream Ports Active",
"source_page": 53,
"source": "datasheet"
},
{
"name": "Standby current VBAT, industrial (single supply)",
"symbol": "IVBAT(STDBY)",
"kind": "electrical",
"unit": "µA",
"min": 0,
"typ": 0.6,
"max": 3.1,
"conditions": "RESET_N = 0, Industrial Temp",
"source_page": 53,
"source": "datasheet"
},
{
"name": "Low-Level Input Voltage (I2C pullups < 2.1V)",
"symbol": "VIL",
"kind": "electrical",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 0.42,
"conditions": "Note 10-1",
"source_page": 54,
"source": "datasheet"
},
{
"name": "Low-Level Input Voltage (I2C pullups > 2.1V)",
"symbol": "VIL",
"kind": "electrical",
"unit": "V",
"min": -0.3,
"typ": null,
"max": 0.34,
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