# F405 Flight Controller Prototype

## Description

39x39mm F405 flight\-controller prototype; reference height 4\.9mm and 30\.5x30\.5mm mounting with 4mm side\-open holes, notch geometry pending\. Separate unequal\-size ESC project: https://flux\.ai/setej72878/four\-channel\-55a\-esc\-prototype\~sd \. Schematic source/part checkpoint only; power, firmware compatibility, original pin positions and proprietary app support not verified\.

## Project Details

- **Owner:** repevok665
- **Created:** 10/11/2026
- **Last Updated:** 10/11/2026
- **Visibility:** Public
- **Forks:** 1

## Key Components

### D2 — [USBLC6\-2SC6](https://flux.ai/vasy_skral/usblc6-2sc6~g1b.md)

- Manufacturer Part Number: USBLC6\-2SC6
- Symbol Style: parametric\-v1
- Role: Protection
- Role Details: USB D\+/D\- ESD clamp VBUS referenced
- License: https://creativecommons\.org/licenses/by/4\.0/
- Part Type: Protection
- Manufacturer Name: STMicroelectronics
- Datasheet URL: https://www\.st\.com/content/ccc/resource/technical/document/datasheet/06/1d/48/9c/6c/20/4a/b2/CD00050750\.pdf/files/CD00050750\.pdf/jcr:content/translations/en\.CD00050750\.pdf
- LCSC Part Number: C7519
- Functional Group: INTERFACE J1 USB

**Pins:**
- GND [pin 2]
- I/O1 [pin 6]
- I/O1 [pin 1]
- I/O2 [pin 3]
- I/O2 [pin 4]
- VBUS [pin 5]

### D3 — [PRTR5V0U4D,125](https://flux.ai/silicon-yard/prtr5v0u4dc125.md)

- Manufacturer Name: Nexperia
- Datasheet URL: https://assets\.nexperia\.com/documents/data\-sheet/PRTR5V0U4D\.pdf
- Role: Protection
- Role Details: Rail steering ESD array VCC3V3 GND; schematic topology based on verified diode diagram and6V minimum breakdown\. Does not tolerate5V logic or signals when FC unpowered\.
- Package or Case Code: TO
- Manufacturer Part Number: PRTR5V0U4D,125
- Functional Group: INTERFACE J3 Custom Motor Signals
- Part Type: Circuit Protection Devices

**Pins:**
- GND [pin 2]
- I/O1 [pin 1]
- I/O2 [pin 3]
- I/O3 [pin 4]
- I/O4 [pin 6]
- VCC [pin 5]

### D4 — [PRTR5V0U4D,125](https://flux.ai/silicon-yard/prtr5v0u4dc125.md)

- Manufacturer Name: Nexperia
- Datasheet URL: https://assets\.nexperia\.com/documents/data\-sheet/PRTR5V0U4D\.pdf
- Functional Group: INTERFACE J4 Receiver GPS
- Package or Case Code: TO
- Role: Protection
- Role Details: Rail steering ESD array VCC3V3 GND; schematic topology based on verified diode diagram and6V minimum breakdown\. Does not tolerate5V logic or signals when FC unpowered\.
- Manufacturer Part Number: PRTR5V0U4D,125
- Part Type: Circuit Protection Devices

**Pins:**
- GND [pin 2]
- I/O1 [pin 1]
- I/O2 [pin 3]
- I/O3 [pin 4]
- I/O4 [pin 6]
- VCC [pin 5]

### D5 — [PRTR5V0U4D,125](https://flux.ai/silicon-yard/prtr5v0u4dc125.md)

- Manufacturer Name: Nexperia
- Datasheet URL: https://assets\.nexperia\.com/documents/data\-sheet/PRTR5V0U4D\.pdf
- Role: Protection
- Functional Group: INTERFACE J5 UART Expansion
- Package or Case Code: TO
- Manufacturer Part Number: PRTR5V0U4D,125
- Role Details: Rail steering ESD array VCC3V3 GND; schematic topology based on verified diode diagram and6V minimum breakdown\. Does not tolerate5V logic or signals when FC unpowered\.
- Part Type: Circuit Protection Devices

**Pins:**
- GND [pin 2]
- I/O1 [pin 1]
- I/O2 [pin 3]
- I/O3 [pin 4]
- I/O4 [pin 6]
- VCC [pin 5]

### D6 — [PRTR5V0U4D,125](https://flux.ai/silicon-yard/prtr5v0u4dc125.md)

- Manufacturer Name: Nexperia
- Datasheet URL: https://assets\.nexperia\.com/documents/data\-sheet/PRTR5V0U4D\.pdf
- Package or Case Code: TO
- Role Details: Rail steering ESD array VCC3V3 GND; schematic topology based on verified diode diagram and6V minimum breakdown\. Does not tolerate5V logic or signals when FC unpowered\.
- Functional Group: INTERFACE J6 UART I2C Expansion
- Role: Protection
- Manufacturer Part Number: PRTR5V0U4D,125
- Part Type: Circuit Protection Devices

**Pins:**
- GND [pin 2]
- I/O1 [pin 1]
- I/O2 [pin 3]
- I/O3 [pin 4]
- I/O4 [pin 6]
- VCC [pin 5]

### D7 — [PRTR5V0U4D,125](https://flux.ai/silicon-yard/prtr5v0u4dc125.md)

- Manufacturer Name: Nexperia
- Role Details: Rail steering ESD array VCC3V3 GND; schematic topology based on verified diode diagram and6V minimum breakdown\. Does not tolerate5V logic or signals when FC unpowered\.
- Datasheet URL: https://assets\.nexperia\.com/documents/data\-sheet/PRTR5V0U4D\.pdf
- Functional Group: INTERFACE J7 Custom Power Sense
- Package or Case Code: TO
- Role: Protection
- Manufacturer Part Number: PRTR5V0U4D,125
- Part Type: Circuit Protection Devices

**Pins:**
- GND [pin 2]
- I/O1 [pin 1]
- I/O2 [pin 3]
- I/O3 [pin 4]
- I/O4 [pin 6]
- VCC [pin 5]

### D8 — [SS14](https://flux.ai/jecstronic/ss14~ri4.md)

- Manufacturer Name: Slkor\(SLKORMICRO Elec\.\)
- Datasheet URL: https://datasheet\.lcsc\.com/lcsc/1912111437\_Slkor\-SLKORMICRO\-Elec\-\-SS14\_C444721\.pdf
- Part Type: Diode
- Functional Group: POWER U4 Logic LDO
- Role Details: External5V F2 to CORE\_5V reverse\-polarity series diode,180\.16mA bound;1A40V\. No USB OR path exists\. Source4\.75\-5\.25V currentlimited only\.
- Role: Reverse Polarity Protection
- Manufacturer Part Number: SS14
- License: https://creativecommons\.org/licenses/by/4\.0/

**Pins:**
- Anode [pin A]
- Cathode [pin C]

### F2 — [0603L050YR](https://flux.ai/adrian95/0603l050yr~cqy.md)

- Manufacturer Name: Littelfuse Inc\.
- Role: Protection
- Role Details: 180\.16mA bounded core;0\.50A hold20C0\.34A60C6V max0\.680ohm R1max\. Regulated4\.75\-5\.25V currentlimited BEC only; no battery protection\.
- Manufacturer Part Number: 0603L050YR
- Datasheet URL: https://www\.littelfuse\.com/assetdocs/resettable\-ptcs\-0603l\-datasheet?assetguid=879563f9\-97a7\-4e71\-adba\-37de085b333f
- Part Type: Fuse
- Functional Group: POWER U4 Logic LDO
- License: https://creativecommons\.org/licenses/by/4\.0/

**Pins:**
- P1 [pin 1]
- P2 [pin 2]

### J1 — [USB4105\-GF\-A\-120](https://flux.ai/adrian95/usb4105-gf-a-120~hy.md)

- Symbol Style: parametric\-v1
- Package or Case Code: GCT\_USB4105\-GF\-A\-120
- Role: Signal Mixing / Detection
- Part Type: USB C
- Functional Group: INTERFACE J1 USB
- Datasheet URL: https://gct\.co/files/specs/usb4105\-spec\.pdf
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: GCT
- Manufacturer Part Number: USB4105\-GF\-A\-120
- Role Details: Self\-powered USB2 data\-only; external regulated5V required\. Q1 inverted PC0 VBUS presence detection; CC pulldowns preserved\. No USB\-to\-core power path\.

**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 — [61300611121](https://flux.ai/adrian95/61300611121~sqm.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Role: Signal Mixing / Detection
- Manufacturer Part Number: 61300611121
- Part Type: Connector
- Role Details: Custom debug pinout;3V3 sense only
- Datasheet URL: https://www\.we\-online\.com/components/products/datasheet/61300611121\.pdf
- Manufacturer Name: Wurth Elektronik
- Functional Group: MCU U1 Flight Controller

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]
- 5 [pin 5]
- 6 [pin 6]

### J3 — [61300611121](https://flux.ai/adrian95/61300611121~sqm.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Part Number: 61300611121
- Part Type: Connector
- Functional Group: INTERFACE J3 Custom Motor Signals
- Role: Connector
- Role Details: Custom NOT stock cable compatible\. 1 M1;2 M2;3 M3;4 M4;5 GND;6 GND\. 3\.3V logic only, no power\.
- Datasheet URL: https://www\.we\-online\.com/components/products/datasheet/61300611121\.pdf
- Manufacturer Name: Wurth Elektronik

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]
- 5 [pin 5]
- 6 [pin 6]

### J4 — [61300611121](https://flux.ai/adrian95/61300611121~sqm.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Role Details: 1 TX1;2 RX1;3 GND;4 TX2;5 RX2;6 GND\. 3\.3V logic only; peripherals separately powered; NOT stock cable compatible\.
- Manufacturer Part Number: 61300611121
- Part Type: Connector
- Role: Signal Mixing / Detection
- Datasheet URL: https://www\.we\-online\.com/components/products/datasheet/61300611121\.pdf
- Manufacturer Name: Wurth Elektronik
- Functional Group: INTERFACE J4 Receiver GPS

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]
- 5 [pin 5]
- 6 [pin 6]

### J5 — [61300611121](https://flux.ai/adrian95/61300611121~sqm.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Part Number: 61300611121
- Part Type: Connector
- Functional Group: INTERFACE J5 UART Expansion
- Datasheet URL: https://www\.we\-online\.com/components/products/datasheet/61300611121\.pdf
- Role: Signal Mixing / Detection
- Role Details: 1 TX3;2 RX3;3 GND;4 TX4;5 RX4;6 GND\. 3\.3V logic only, no accessory power\.
- Manufacturer Name: Wurth Elektronik

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]
- 5 [pin 5]
- 6 [pin 6]

### J6 — [61300611121](https://flux.ai/adrian95/61300611121~sqm.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Part Number: 61300611121
- Part Type: Connector
- Role Details: 1 TX6;2 RX6;3 GND;4 SCL1;5 SDA1;6 GND\. 3\.3V only\. I2C100kHz short cable; no accessory power\.
- Datasheet URL: https://www\.we\-online\.com/components/products/datasheet/61300611121\.pdf
- Role: Signal Mixing / Detection
- Functional Group: INTERFACE J6 UART I2C Expansion
- Manufacturer Name: Wurth Elektronik

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]
- 5 [pin 5]
- 6 [pin 6]

### J7 — [61300611121](https://flux.ai/adrian95/61300611121~sqm.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Part Number: 61300611121
- Part Type: Connector
- Functional Group: INTERFACE J7 Custom Power Sense
- Datasheet URL: https://www\.we\-online\.com/components/products/datasheet/61300611121\.pdf
- Role: Signal Mixing / Detection
- Role Details: NOT stock cable compatible\.1 regulated5V IN4\.75\-5\.25V;2 GND;3 VBAT sense ONLY0\-25\.2V nominal30V bounded;4 current sensor0\-5V;5 UART5 RX3\.3V;6 GND\. No LiPo power input\.
- Manufacturer Name: Wurth Elektronik

**Pins:**
- 1 [pin 1]
- 2 [pin 2]
- 3 [pin 3]
- 4 [pin 4]
- 5 [pin 5]
- 6 [pin 6]

### Q1 — [2N7002H6327XTSA2](https://flux.ai/jecstronic/2n7002h6327xtsa2~wyr.md)

- Manufacturer Name: Infineon Technologies
- Part Type: Transistor
- Datasheet URL: https://www\.mouser\.com/datasheet/2/196/Infineon\_2N7002\_DS\_v02\_04\_en\-1225920\.pdf
- Role Details: Gate from USB VBUS; source GND; drain PC0 pulled up3V3\. LOW means VBUS present\. USB data\-only externally powered FC\.
- Role: Signal Mixing / Detection
- Manufacturer Part Number: 2N7002H6327XTSA2
- License: https://creativecommons\.org/licenses/by/4\.0/
- Functional Group: INTERFACE J1 USB

**Pins:**
- D [pin 3]
- G [pin 1]
- S [pin 2]

### U1 — [STM32F405RGT6](https://flux.ai/jharwinbarrozo/stm32f405rgt6~ssm.md)

- Manufacturer Part Number: STM32F405RGT6
- Manufacturer Name: STMicroelectronics
- Part Type: Integrated Circuit
- Functional Group: MCU U1 Flight Controller
- Role Details: Flight controller MCU; prototype target pending
- Role: Controller
- Datasheet URL: http://www\.st\.com/content/ccc/resource/technical/document/datasheet/ef/92/76/6d/bb/c2/4f/f7/DM00037051\.pdf/files/DM00037051\.pdf/jcr:content/translations/en\.DM00037051\.pdf

**Pins:**
- BOOT0 [pin 60]
- NRST [pin 7]
- PA0\_WKUP [pin 14]
- PA1 [pin 15]
- PA10 [pin 43]
- PA11 [pin 44]
- PA12 [pin 45]
- PA13 [pin 46]
- PA14 [pin 49]
- PA15 [pin 50]
- PA2 [pin 16]
- PA3 [pin 17]
- PA4 [pin 20]
- PA5 [pin 21]
- PA6 [pin 22]
- PA7 [pin 23]
- PA8 [pin 41]
- PA9 [pin 42]
- PB0 [pin 26]
- PB1 [pin 27]
- PB10 [pin 29]
- PB11 [pin 30]
- PB12 [pin 33]
- PB13 [pin 34]
- PB14 [pin 35]
- PB15 [pin 36]
- PB2 [pin 28]
- PB3 [pin 55]
- PB4 [pin 56]
- PB5 [pin 57]
- PB6 [pin 58]
- PB7 [pin 59]
- PB8 [pin 61]
- PB9 [pin 62]
- PC0 [pin 8]
- PC1 [pin 9]
- PC10 [pin 51]
- PC11 [pin 52]
- PC12 [pin 53]
- PC13 [pin 2]
- PC14 [pin 3]
- PC15 [pin 4]
- PC2 [pin 10]
- PC3 [pin 11]
- PC4 [pin 24]
- PC5 [pin 25]
- PC6 [pin 37]
- PC7 [pin 38]
- PC8 [pin 39]
- PC9 [pin 40]
- PD2 [pin 54]
- PH0 [pin 5]
- PH1 [pin 6]
- VBAT [pin 1]
- VCAP\_1 [pin 31]
- VCAP\_2 [pin 47]
- VDD1 [pin 19]
- VDD2 [pin 32]
- VDD3 [pin 48]
- VDD4 [pin 64]
- VDDA [pin 13]
- VSS1 [pin 18]
- VSS2 [pin 63]
- VSSA [pin 12]

### U2 — [ICM\-42688\-P](https://flux.ai/jecstronic/icm-42688-p~5tz.md)

- License: https://creativecommons\.org/licenses/by/4\.0/
- Datasheet URL: https://mm\.digikey\.com/Volume0/opasdata/d220001/medias/docus/495/ICM\-42688\-P\_DS\_Rev1\.2\.pdf
- Role Details: ICM42688P SPI IMU
- Role: Sensor
- Part Type: Sensor
- Functional Group: SENSOR U2 IMU
- Manufacturer Part Number: ICM\-42688\-P
- Manufacturer Name: TDK InvenSense

**Pins:**
- AP\_CS [pin 12]
- AP\_SCL/AP\_SCLK [pin 13]
- AP\_SDA/AP\_SDIO/AP\_SDI [pin 14]
- AP\_SDO/AP\_AD0 [pin 1]
- GND [pin 6]
- INT1/INT [pin 4]
- INT2/FSYNC/CLKIN [pin 9]
- RESV\_10 [pin 10]
- RESV\_11 [pin 11]
- RESV\_2 [pin 2]
- RESV\_3 [pin 3]
- RESV\_7 [pin 7]
- VDD [pin 8]
- VDDIO [pin 5]

### U3 — [W25Q128JVSIM TR](https://flux.ai/jecstronic/w25q128jvsim-tr~btu.md)

- Functional Group: MEMORY U3 Blackbox
- Manufacturer Part Number: W25Q128JVSIM TR
- Manufacturer Name: Winbond Electronics
- License: https://creativecommons\.org/licenses/by/4\.0/
- Datasheet URL: https://www\.winbond\.com/resource\-files/w25q128jv\_dtr%20revc%2003272018%20plus\.pdf
- Role Details: 128Mbit blackbox; firmware JEDEC support pending
- Role: Memory
- Part Type: Integrated Circuit

**Pins:**
- /CS [pin 1]
- /HOLD\_OR\_/RESET\_\(IO3\) [pin 7]
- /WP\_\(IO2\) [pin 3]
- CLK [pin 6]
- DI\_\(IO0\) [pin 5]
- DO\_\(IO1\) [pin 2]
- GND [pin 4]
- VCC [pin 8]

### U4 — [AP2112K\-3\.3TRG1](https://flux.ai/adrian95/ap2112k-33trg1~zlq.md)

- Functional Group: POWER U4 Logic LDO
- Symbol Style: parametric\-v1
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: Diodes Incorporated
- Manufacturer Part Number: AP2112K\-3\.3TRG1
- Role Details: 3V3 logic170mA allocation including VBUS detect0\.33mA; CORE\_5V from external regulated4\.75\-5\.25V ONLY via F2/D8; USBdata\-only\. Worst Pd0\.3315W/61C rise screen; ambient\<=40C pending thermal test\.
- Part Type: Integrated Circuit
- Role: Power Conversion
- Datasheet URL: https://www\.diodes\.com/assets/Datasheets/AP2112\.pdf

**Pins:**
- EN [pin 3]
- GND [pin 2]
- NC [pin 4]
- VIN [pin 1]
- VOUT [pin 5]

### U5 — [AP2112K\-3\.3TRG1](https://flux.ai/adrian95/ap2112k-33trg1~zlq.md)

- Symbol Style: parametric\-v1
- License: https://creativecommons\.org/licenses/by/4\.0/
- Manufacturer Name: Diodes Incorporated
- Manufacturer Part Number: AP2112K\-3\.3TRG1
- Part Type: Integrated Circuit
- Functional Group: POWER U5 Quiet IMU LDO
- Role Details: Quiet independent IMU3V3 output
- Datasheet URL: https://www\.diodes\.com/assets/Datasheets/AP2112\.pdf
- Role: Power Conversion

**Pins:**
- EN [pin 3]
- GND [pin 2]
- NC [pin 4]
- VIN [pin 1]
- VOUT [pin 5]

### Y1 — [ASE\-8\.000MHZ\-L\-C\-T](https://flux.ai/adrian95/ase-8p000mhz-l-c-t~yms.md)

- Role: Timing
- Manufacturer Name: Abracon LLC
- Functional Group: MCU U1 Flight Controller
- Datasheet URL: https://abracon\.com/Oscillators/ASEseries\.pdf
- Role Details: 3\.3V8MHz active oscillator instead of unverified crystal load circuit
- Part Type: Oscillator
- Manufacturer Part Number: ASE\-8\.000MHZ\-L\-C\-T
- License: https://creativecommons\.org/licenses/by/4\.0/

**Pins:**
- GND/CASE [pin 2]
- OUTPUT [pin 3]
- TRI\-STATE\_\(STBY\) [pin 1]
- VDD [pin 4]

*The full schematic, PCB layout, bill of materials, and interactive design are available at [https://flux\.ai/repevok665/f405\-flight\-controller\-prototype\~ym](https://flux.ai/repevok665/f405-flight-controller-prototype~ym).*

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*Generated from [https://flux\.ai/repevok665/f405\-flight\-controller\-prototype\~ym](https://flux.ai/repevok665/f405-flight-controller-prototype~ym)*