component
VL103-Q4
Public Made by Adomby adom
VIA Tech USB ICs, QFN-48-EP(6x6). Pinout cross-checked by two models against the datasheet, KiCad symbol/footprint/3D.
3D Model
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Symbol & Footprint
Schematic Symbol
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PCB Footprint
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Datasheet
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README
markdownVL103-Q4
VIA Tech · USB ICs · QFN-48-EP(6x6)
VL103-Q4 from VIA Tech, in a QFN-48-EP(6x6). Pinout and pin descriptions extracted from the manufacturer datasheet (extract_pins, cross-checked by a second model); symbol, footprint, and 3D from KiCad-official CAD.
Pinout
| Pin | Name | Type | Function |
|---|---|---|---|
| 1 | VDD5IN | power_in | 5V power input for Vconn power output. |
| 2 | CC1_D | bidirectional | DRP port Configuration Channel 1. |
| 3 | CC2_D | bidirectional | DRP port Configuration Channel 2. |
| 4 | ODV5DP | output | Open-drain I/O for 5V video power control. |
| 5 | AUXP | bidirectional | DP AUX channel positive. |
| 6 | AUXN | bidirectional | DP AUX channel negative. |
| 7 | HPD | input | DP Hot Plug Detect input. |
| 8 | SBU1 | bidirectional | Sideband Use 1. |
| 9 | SBU2 | bidirectional | Sideband Use 2. |
| 10 | CC2_U | bidirectional | Charging UFP Configuration Channel 2. |
| 11 | CC1_U | bidirectional | Charging UFP Configuration Channel 1. |
| 12 | VBUS_DET2 | input | USB-C DRP Vbus voltage detector input. |
| 13 | VBUS_DET1 | input | USB-C charging UFP Vbus voltage detector input. |
| 14 | REXT | passive | Analog bias pin; connect to an external 20.5K ohm, +/-1% accuracy resistor. |
| 15 | VCONNIN33 | power_in | 3.3V Vconn power input (recommended 3.0 to 3.6V). |
| 16 | LDOVDD5 | power_in | 5V input for the 5V-to-3.3V LDO (recommended 4.5 to 5.5V). |
| 17 | LDOVDD33O | power_out | 3.3V output pin of the 5V-to-3.3V LDO. |
| 18 | OSCVDD18O | power_out | Analog 1.8V power output. |
| 19 | GPIO11 | bidirectional | General purpose I/O. |
| 20 | GPIO10 | bidirectional | General purpose I/O. |
| 21 | BOOST_VTRL | input | Boost voltage control input. |
| 22 | CS_N | input | Current sensing negative input. |
| 23 | CS_P | input | Current sensing positive input. |
| 24 | DP_IN | bidirectional | D+ data line connected to the downstream facing port. |
| 25 | DM_IN | bidirectional | D- data line connected to the downstream facing port. |
| 26 | DM_OUT | bidirectional | D- data line connected to the upstream facing port. |
| 27 | DP_OUT | bidirectional | D+ data line connected to the upstream facing port. |
| 28 | DM_U | bidirectional | D- data line to the USB Billboard device. |
| 29 | DP_U | bidirectional | D+ data line to the USB Billboard device. |
| 30 | VCC33 | power_in | Digital 3.3V IO power input (recommended 3.0 to 3.6V). |
| 31 | GPIO9 | bidirectional | General purpose I/O. |
| 32 | GPIO8 | bidirectional | General purpose I/O. |
| 33 | GPIO7 | bidirectional | General purpose I/O. |
| 34 | GPIO6 | bidirectional | General purpose I/O. |
| 35 | GPIO5 | bidirectional | General purpose I/O. |
| 36 | GPIO3 | bidirectional | General purpose I/O. |
| 37 | VDD5V | power_in | E-fuse power input, connected to 3.3V in normal use. |
| 38 | VCC33 | power_in | Digital 3.3V IO power input (recommended 3.0 to 3.6V). |
| 39 | GPIO4 | bidirectional | General purpose I/O. |
| 40 | DVCC18 | power_in | Digital 1.8V core power input (recommended 1.62 to 1.98V). |
| 41 | GPIO1 | bidirectional | General purpose I/O. |
| 42 | GPIO2 | bidirectional | General purpose I/O. |
| 43 | RESET_ | input | External chip reset input. |
| 44 | TESTEN | input | Test mode enable with internal pull-down; do not connect for normal operation. |
| 45 | SPI_CS_ | output | Serial flash chip enable. |
| 46 | SPI_Q | input | Serial flash data output (input to the VL103). |
| 47 | SPI_CLK | output | Serial flash clock. |
| 48 | SPI_D | output | Serial flash data input (output from the VL103). |
| 49 | EP | passive | Exposed pad (from the footprint; not named in the datasheet pin table). |
Key specifications
| Parameter | Value |
|---|---|
| Manufacturer | VIA Tech |
| Package | QFN-48-EP(6x6) |
| Category | Interface ICs |
| Pins | 49 |
Electrical characteristics
Limits as printed in the datasheet (page.json metadata.characteristics carries them as data).
| Parameter | Symbol | Min | Typ | Max | Unit | Conditions | Page |
|---|---|---|---|---|---|---|---|
| Storage Temperature | TSTG | -55 | 125 | °C | 13 | ||
| 3.3V Power Input Voltage | VDD33 | -0.5 | 3.69 | V | 13 | ||
| 5V Power Input Voltage | VDD50 | -0.5 | 5.5 | V | 13 | ||
| Output Voltage at any output | VO | -0.5 | V | max = VCC+0.5 V | 13 | ||
| Electrostatic Discharge | VESD | -2 | 2 | kV | Human Body Model | 13 | |
| 5V to 3.3V LDO 5V Power Input | LDOVDD5 | 4.5 | 5 | 5.5 | V | 13 | |
| 3.3V Vconn power input | VCONNIN33 | 3 | 3.3 | 3.6 | V | 13 | |
| Digital IO power 3.3V | VCC33 | 3 | 3.3 | 3.6 | V | 13 | |
| Digital Core power 1.8V | DVCC18 | 1.62 | 1.8 | 1.98 | V | 13 | |
| Ground | DGND | 0 | V | 13 | |||
| Ambient Temperature | TA | 0 | 70 | °C | 13 | ||
| Input Low Voltage | VIL | -0.3 | 0.8 | V | 13 | ||
| Input High Voltage | VIH | 2 | 3.6 | V | 13 | ||
| Output Low Voltage | VOL | 0.4 | V | IOL=15.8mA | 13 | ||
| Output High Voltage | VOH | 2.4 | V | IOH=26.5mA | 13 | ||
| Input Leakage Current | IIL | -10 | 10 | µA | 0<VIN<VCC | 13 | |
| Tristate Leakage Current | IOZ | -10 | 10 | µA | 0<VOUT<VCC | 13 | |
| 3.3V to 1.8V LDO Input Voltage | 3 | 3.3 | 3.6 | V | Internal 3.3V to 1.8V LDO | 13 | |
| 3.3V to 1.8V LDO Output Voltage | 1.71 | 1.8 | 1.89 | V | Internal 3.3V to 1.8V LDO | 13 | |
| 3.3V to 1.8V LDO Max. Output Current | 100 | mA | Internal 3.3V to 1.8V LDO | 13 | |||
| 3.3V to 1.8V LDO Output Voltage Tolerance | -5 | 5 | % | Internal 3.3V to 1.8V LDO | 13 | ||
| 5V to 3.3V LDO Input Voltage | 4.5 | 5 | 5.5 | V | Internal 5V to 3.3V LDO | 14 | |
| 5V to 3.3V LDO Output Voltage | 3.135 | 3.3 | 3.465 | V | Internal 5V to 3.3V LDO | 14 | |
| 5V to 3.3V LDO Max. Output Current | 100 | mA | Internal 5V to 3.3V LDO | 14 | |||
| 5V to 3.3V LDO Output Voltage Tolerance | -5 | 5 | % | Internal 5V to 3.3V LDO | 14 | ||
| PD BMC Voltage Swing | VBMCSWING | 1.05 | 1.2 | V | 14 | ||
| PD BMC Drive Output Resistance | ZBMCDRV | 33 | 75 | Ω | 14 | ||
| PD BMC Rise Time | TBMCR | 300 | ns | 14 | |||
| PD BMC Fall Time | TBMCF | 300 | ns | 14 | |||
| USB FS High state input level | VIH | 2 | V | USB Full Speed | 14 | ||
| USB FS High-z state input level | VIHZ | 2.7 | 3.6 | V | USB Full Speed | 14 | |
| USB FS Low state input level | VIL | 0.8 | V | USB Full Speed | 14 | ||
| USB FS Differential input sensitivity | VDI | 0.2 | V | USB Full Speed | 14 | ||
| USB FS Differential common mode | VCM | 0.8 | 2.5 | V | USB Full Speed | 14 | |
| USB FS Low state output level | VOL | 0 | 0.3 | V | USB Full Speed | 14 | |
| USB FS High state output level | VOH | 2.8 | 3.6 | V | USB Full Speed | 14 | |
| USB FS Output signal crossover voltage | VCRS | 1.3 | 2 | V | USB Full Speed | 14 | |
| USB FS Bus pull-up resistor | RPU | 1.425 | 1.575 | KΩ | USB Full Speed | 14 | |
| USB FS Driver output resistance | ZDRV | 28 | 44 | Ω | USB Full Speed | 14 | |
| USB FS Rise Time | TFR | 4 | 20 | ns | USB Full Speed | 14 | |
| USB FS Fall Time | TFF | 4 | 20 | ns | USB Full Speed | 14 | |
| QFN-48 IR Reflow Maximum Temperature | Tp | 250 | °C | Pb-free IR reflow | 15 | ||
| QFN-48 Max Time within 5°C of Tp | 30 | seconds | Pb-free IR reflow | 15 | |||
| REXT external resistor | REXT | -1 | 1 | % | External resistor 20.5K ohm, +/- 1% accuracy | 12 |
CAD (KiCad official)
- Symbol:
VL103-Q4 - Footprint:
Package_DFN_QFN:QFN-48-1EP_6x6mm_P0.4mm_EP4.2x4.2mm - 3D model: QFN-48-EP(6x6), generated from the KiCad footprint (body from the F.Fab outline, terminals on the pads, 0.9 mm nominal QFN height). Neither the vendor nor KiCad ships a 3D model for this package, so the dimensions are nominal, not the manufacturer's CAD (STEP)
- 3D model files:
vl103-q4-etched.step/vl103-q4-etched.glbcarry the MPN laser-etched on the die in a toggleableAdom.LaserEtchgroup (Fusion-ready);vl103-q4.step/vl103-q4.glbare the bare package body.
Provenance
Data extracted from the manufacturer datasheet, not a distributor listing:
- Datasheet: VIA Tech datasheet (18 pp, sha256
18e788fff3b26a0e, retrieved 2026-10-27, tier: lcsc) - Extractor: parts-factory
2.0.0/extract_pins 0.3, primaryclaude-sonnet-5-5(text), consensusclaude-sonnet-5-5(agreed), guards: pin_guards 0.1: passed. Pins are checked against the footprint pad set and their cited datasheet pages before publish. - CAD: KiCad official libraries (CC-BY-SA 4.0).