# USB 2.0 Host Switch ## Description Externally powered USB 2.0 high-speed switch that toggles one downstream self-powered hub between two USB-C host computers with stable break-before-make switching for USB audio reliability. ## Project Details - **Owner:** michaelpigg - **Created:** 7/3/2026 - **Last Updated:** 7/3/2026 - **Visibility:** Public ## Key Components ### D1 — [USBLC6-2SC6](https://www.flux.ai/lcsc/usblc6-2sc6~2e9x.md) - Maximum Clamping Voltage: 17V - Symbol Style: parametric-v1 - Manufacturer Name: UMW(友台半导体) - LCSC Part Number: C2687116 - Role Details: Low-capacitance TVS for Host A D+/D- - Operating Temperature: -55°C ~ 125°C (TJ) - Manufacturer Part Number: USBLC6-2SC6 - Peak Pulse Current: 5A - JLCPCB Part Class: Extended Part - Part Type: ESD Protection Devices - Role: Protection - Datasheet URL: https://www.lcsc.com/datasheet/C2687116.pdf?spm=wm.sxq.inf.ggs&lcsc_vid=FlkNBAIDRQULVABfFAVZBgZVFVZYBgZSQ1NeBVIFQlExVlNRTlhdUVdURFlXXzsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D - Power: 150W - Breakdown Voltage: 6V - Package or Case Code: SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BL **Pins:** - GND [pin 2] - I/O1 [pin 1] - I/O1 [pin 6] - I/O2 [pin 3] - I/O2 [pin 4] - VBUS [pin 5] ### D2 — [USBLC6-2SC6](https://www.flux.ai/lcsc/usblc6-2sc6~2e9x.md) - Role: Protection - Operating Temperature: -55°C ~ 125°C (TJ) - LCSC Part Number: C2687116 - Role Details: Low-capacitance TVS for Host B D+/D- - Manufacturer Name: UMW(友台半导体) - Symbol Style: parametric-v1 - Maximum Clamping Voltage: 17V - Package or Case Code: SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BL - Breakdown Voltage: 6V - Power: 150W - Datasheet URL: https://www.lcsc.com/datasheet/C2687116.pdf?spm=wm.sxq.inf.ggs&lcsc_vid=FlkNBAIDRQULVABfFAVZBgZVFVZYBgZSQ1NeBVIFQlExVlNRTlhdUVdURFlXXzsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D - Part Type: ESD Protection Devices - JLCPCB Part Class: Extended Part - Manufacturer Part Number: USBLC6-2SC6 - Peak Pulse Current: 5A **Pins:** - GND [pin 2] - I/O1 [pin 1] - I/O1 [pin 6] - I/O2 [pin 3] - I/O2 [pin 4] - VBUS [pin 5] ### J1 — [USB4105-GF-A](https://www.flux.ai/adrian95/usb4105-gf-a~im9.md) - Manufacturer Name: GCT - Manufacturer Part Number: USB4105-GF-A - Datasheet URL: https://gct.co/files/specs/usb4105-spec.pdf - Part Type: USB C - Manufacturer Name: GCT - Role: USB-C UFP Port - Role Details: Host A connection; presents CC Rd and routes USB2 D+/D- to mux port 1 - License: https://creativecommons.org/licenses/by/4.0/ - Symbol Style: parametric-v1 **Pins:** - CC1 [pin A5] - CC2 [pin B5] - DN1 [pin A7] - DN2 [pin B7] - DP1 [pin A6] - DP2 [pin B6] - GND [pin A1_B12] - GND__1 [pin B1_A12] - SBU1 [pin A8] - SBU2 [pin B8] - SHELL_GND [pin SH1] - SHELL_GND__1 [pin SH2] - SHELL_GND__2 [pin SH3] - SHELL_GND__3 [pin SH4] - VBUS [pin A4_B9] - VBUS__1 [pin B4_A9] ### J2 — [USB4105-GF-A](https://www.flux.ai/adrian95/usb4105-gf-a~im9.md) - Manufacturer Part Number: USB4105-GF-A - Manufacturer Name: GCT - Part Type: USB C - Role Details: Host B connection; presents CC Rd and routes USB2 D+/D- to mux port 2 - Manufacturer Name: GCT - Datasheet URL: https://gct.co/files/specs/usb4105-spec.pdf - Role: USB-C UFP Port - Symbol Style: parametric-v1 - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - CC1 [pin A5] - CC2 [pin B5] - DN1 [pin A7] - DN2 [pin B7] - DP1 [pin A6] - DP2 [pin B6] - GND [pin A1_B12] - GND__1 [pin B1_A12] - SBU1 [pin A8] - SBU2 [pin B8] - SHELL_GND [pin SH1] - SHELL_GND__1 [pin SH2] - SHELL_GND__2 [pin SH3] - SHELL_GND__3 [pin SH4] - VBUS [pin A4_B9] - VBUS__1 [pin B4_A9] ### J3 — [USB4105-GF-A](https://www.flux.ai/adrian95/usb4105-gf-a~im9.md) - Manufacturer Name: GCT - Manufacturer Part Number: USB4105-GF-A - Datasheet URL: https://gct.co/files/specs/usb4105-spec.pdf - Part Type: USB C - Manufacturer Name: GCT - Role Details: Connects to self-powered hub; presents CC Rp and hub-side VBUS from external supply - Role: USB-C DFP Port - License: https://creativecommons.org/licenses/by/4.0/ - Symbol Style: parametric-v1 **Pins:** - CC1 [pin A5] - CC2 [pin B5] - DN1 [pin A7] - DN2 [pin B7] - DP1 [pin A6] - DP2 [pin B6] - GND [pin A1_B12] - GND__1 [pin B1_A12] - SBU1 [pin A8] - SBU2 [pin B8] - SHELL_GND [pin SH1] - SHELL_GND__1 [pin SH2] - SHELL_GND__2 [pin SH3] - SHELL_GND__3 [pin SH4] - VBUS [pin A4_B9] - VBUS__1 [pin B4_A9] ### J4 — [Type-C-2.0-6Pin](https://www.flux.ai/lcsc/type-c-2p0-6pin~3phf.md) - Role Details: USB-C sink input for external 5V power supply - Manufacturer Part Number: USB4515-GF-A - Part Type: USB Connectors - Symbol Style: parametric-v1 - Role: Power Input - Manufacturer Name: Global Connector Technology - Package or Case Code: TYPE-C-SMD_TYPE-C-6P-2 - Datasheet URL: https://www.snapeda.com/parts/USB4515-GF-A/Global%20Connector%20Technology/datasheet/ - JLCPCB Part Class: Extended Part - LCSC Part Number: C7374563 **Pins:** - CC1 [pin A5] - CC2 [pin B5] - EH [pin 7] - GND [pin B12] - GND [pin A12] - VBUS [pin A9] - VBUS [pin B9] ### J5 — [AVR-ISP-6](https://www.flux.ai/vasy_skral/avr-isp-6~ry.md) - Manufacturer Part Number: 61200621621 - Role Details: AVR ISP connection for MISO/MOSI/SCK/RESET/VCC/GND - Exclude from BOM: false - Symbol Style: parametric-v1 - Datasheet URL: https://www.we-online.com/catalog/datasheet/61200621621.pdf - Role: Programming Header - Manufacturer Name: Würth Elektronik - Part Type: Connector **Pins:** - GND [pin 6] - MISO [pin 1] - MOSI [pin 4] - RST [pin 5] - SCK [pin 3] - VCC [pin 2] ### SW1 — [TS-1088-AR02016](https://www.flux.ai/lcsc/ts-1088-ar02016~e3n1.md) - LCSC Part Number: C720477 - Manufacturer Name: XUNPU(讯普) - Product Info Url: https://lcsc.com/product-detail/Tactile-Switches_XUNPU-TS-1088-AR02016_C720477.html - Part Type: Tactile Switches - JLCPCB Part Class: Extended Part - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2409302330_XUNPU-TS-1088-AR02016_C720477.pdf - Role Details: Momentary switch toggles selected host in firmware - Manufacturer Part Number: TS-1088-AR02016 - Role: Switching - Package or Case Code: SW-SMD_L3.9-W3.0-P4.45 **Pins:** - 1 [pin 1] - 2 [pin 2] ### U1 — [TS3USB30EDGSR](https://www.flux.ai/kicad-part-library/ts3usb30edgsr~kgs.md) - Manufacturer Part Number: TS3USB30EDGSR - Role Details: Switches D+/D- between Host A and Host B with OE disconnect for break-before-make - Package or Case Code: VSSOP-10_3x3mm_P0.5mm - Datasheet URL: https://www.ti.com/lit/ds/symlink/ts3usb30e.pdf - Role: Switching - Manufacturer Name: Texas Instruments Inc. **Pins:** - ~{OE} [pin 9] - D- [pin 6] - D+ [pin 4] - D1- [pin 8] - D1+ [pin 2] - D2- [pin 7] - D2+ [pin 3] - GND [pin 5] - S [pin 1] - VCC [pin 10] ### U2 — [ATTINY85V-10SU](https://www.flux.ai/adrian95/attiny85v-10su~fqd.md) - Manufacturer Name: Microchip - Manufacturer Part Number: ATTINY85V-10SU - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Microcontroller - Role: Controller - Datasheet URL: https://ww1.microchip.com/downloads/en/DeviceDoc/Atmel-2586-AVR-8-bit-Microcontroller-ATtiny25-ATtiny45-ATtiny85_Datasheet-Summary.pdf - Role Details: Controls USB mux select and output enable timing **Pins:** - ~RESET~/PB5 [pin 1] - AREF/PB0 [pin 5] - GND [pin 4] - PB1 [pin 6] - PB2 [pin 7] - VCC [pin 8] - XTAL1/PB3 [pin 2] - XTAL2/PB4 [pin 3] ### U3 — [MIC5205-3.3YM5](https://www.flux.ai/jecstronic/mic5205-3p3ym5~qom.md) - Part Type: Integrated Circuit - Manufacturer Name: Micrel - Manufacturer Part Number: MIC5205-3.3YM5 - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://images.100y.com.tw/pdf_file/38-Micrel-MIC5205.pdf - Role Details: Generates stable 3V3 logic rail from external 5V input - Role: Power Conversion **Pins:** - BP [pin 4] - EN [pin 3] - GND [pin 2] - IN [pin 1] - OUT [pin 5] ### U4 — [TPD3S014](https://www.flux.ai/kicad-part-library/tpd3s014~3e2.md) - Manufacturer Part Number: TPD3S014 - Role Details: MCU-enabled 0.5A current-limited hub-side VBUS switch; integrated data ESD protects downstream hub D+/D- - Datasheet URL: http://www.ti.com/lit/ds/symlink/tpd3s014.pdf - Manufacturer Name: Texas Instruments Inc. - Role: Current Limiting - Package or Case Code: SOT-23-6 **Pins:** - D1 [pin 5] - D2 [pin 6] - EN [pin 1] - GND [pin 2] - IN [pin 3] - OUT [pin 4] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/michaelpigg/usb-2p0-host-switch~rq](https://www.flux.ai/michaelpigg/usb-2p0-host-switch~rq).* --- *Generated from [https://www.flux.ai/michaelpigg/usb-2p0-host-switch~rq](https://www.flux.ai/michaelpigg/usb-2p0-host-switch~rq)*