4 layers125 × 100 mm
2 layers50.2 × 19.4 mm
Head3
kntzn/head- Size
- 50.2 × 19.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 77
- Nets
- 71
- Pads
- 217
- Tracks, vias
- 513, 51
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 8 Feb 2026
- Updated
- 28 Apr 2026
Overview
Head3 is an open-source printed circuit board by kntzn, from the kntzn/head repository on GitHub. It is a 2-layer board of 50.2 × 19.4 mm with 77 parts on 71 nets, routed with 513 tracks and 51 vias.
It is built around the DW01A, FS8205A and TP4056-42-ESOP8, with the TPS73101DBV, MMBTA42 and BAS21 among its other parts. Its parts include 33 resistors, 9 capacitors, 9 transistors, 6 diodes and 5 ICs. It belongs with the STM32 boards of this library.
Main components
8
DW01A
SOT-23-6L-40℃~+85℃ 1 2.5V 300mV~10V 3uA 4.3V Protection IC Support SOT-23-6L Battery Management ROHSPUOLOPBattery ManagementFS8205A
SOT-23-6-55℃~+150℃ 1.2V 1.5W 2 N-Channel 20V 31.5mΩ@2.5V 466pF 5.7nC@4.5V 58pF 65pF 6A SOT-23-6 MOSFETs ROHSTECH PUBLICMOSFETs
TP4056-42-ESOP8
ESOP-8-40℃~+85℃ 1 1A 2uA 4.2V 4V~8V Charging IC Lithium Battery Support ESOP-8 Battery Management ROHSTOPPOWERBattery Management
TPS73101DBV
SOT-23-5-40℃~+125℃@(Tj) 1 1.2V~5.5V 100mV@(150mA) 150mA 30uVrms 37dB@(10kHz)、58dB@(100Hz) 400uA 5.5V Adjustable Over Current Protection、Over Temperature Protection、Over Voltage Protection、Enable Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
MMBTA42
SOT-23-55℃~+150℃ 1 NPN 100 100nA 200mV 300V 350mW 500mA 50MHz 5V NPN SOT-23 Bipolar (BJT) ROHShongjiachengBipolar (BJT)BAS21
SOT-231.25V@200mA 100nA@100V 200mA 250V 9A Independent SOT-23 Diodes - General Purpose ROHSNexperiaSwitching DiodesMMBTA92
SOT-23-55℃~+150℃ 1 PNP 100nA 200mV 300V 350mW 500mA 50MHz 5V 60 PNP SOT-23 Bipolar (BJT) ROHShongjiachengBipolar (BJT)BC817
SOT-231 NPN 100nA 150MHz 300mW 40 45V 500mA 5V 700mV NPN SOT-23 Bipolar (BJT) ROHSShikuesBipolar (BJT)
Parts
77| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 47k | Resistor_SMD:R_0603_1608Metric | R2, R3, R4, R21, R25, R29, R30 |
| 6 | MMBTA42 | Package_TO_SOT_SMD:SOT-23 | Q2, Q3, Q8, Q9, Q10, Q12 |
| 5 | 100n | Capacitor_SMD:C_0603_1608Metric | C1, C2, C5, C6, C7 |
| 5 | 1k | Resistor_SMD:R_0603_1608Metric | R10, R12, R15, R17, R22 |
| 5 | 2k2 | Resistor_SMD:R_0603_1608Metric | R9, R19, R20, R23, R32 |
| 4 | 20k | Resistor_SMD:R_0603_1608Metric | R11, R18, R33, R34 |
| 3 | BAS21 | Package_TO_SOT_SMD:SOT-23 | D1, D2, D3 |
| 3 | LED | Diode_SMD:D_0603_1608Metric | D4, D5, D6 |
| 2 | 100 | Resistor_SMD:R_0603_1608Metric | R13, R24 |
| 2 | 10u | Capacitor_SMD:C_0603_1608Metric | C8, C9 |
| 2 | 2.5u | Capacitor_SMD:C_1210_3225Metric | C3, C4 |
| 2 | 220 | Resistor_SMD:R_0603_1608Metric | R27, R28 |
| 2 | 47 | Resistor_SMD:R_0603_1608Metric | R14, R26 |
| 2 | 470k | Resistor_SMD:R_0603_1608Metric | R5, R16 |
| 2 | MMBTA92 | Package_TO_SOT_SMD:SOT-23 | Q6, Q7 |
| 2 | O_1 | TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm | O2, O3 |
| 2 | O_2 | TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm | O1, O4 |
| 1 | 1M | Resistor_SMD:R_0603_1608Metric | R7 |
| 1 | 220k | Resistor_SMD:R_0603_1608Metric | R31 |
| 1 | 22k | Resistor_SMD:R_0603_1608Metric | R8 |
| 1 | 330 | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | BAT+ | TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm | BAT+1 |
| 1 | BAT- | TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm | BAT-1 |
| 1 | BC817 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | BZ+ | TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm | BZ+1 |
| 1 | BZ- | TestPoint:TestPoint_THTPad_D2.0mm_Drill1.0mm | BZ-1 |
| 1 | CLK | TestPoint:TestPoint_Pad_D2.0mm | SWCLK1 |
| 1 | DIO | TestPoint:TestPoint_Pad_D2.0mm | SWDIO1 |
| 1 | DW01A | Package_TO_SOT_SMD:SOT-23-6 | U4 |
| 1 | FS8205A | Package_SO:TSSOP-8_4.4x3mm_P0.65mm | U6 |
| 1 | GND | TestPoint:TestPoint_Pad_D2.0mm | GND1 |
| 1 | L | Inductor_SMD:L_1812_4532Metric | L1 |
| 1 | STM32L010F4Px | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U1 |
| 1 | SW_Push | Button_Switch_THT:SW_PUSH_6mm | SW1 |
| 1 | TP4056-42-ESOP8 | Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.41x3.3mm_ThermalVias | U2 |
| 1 | TPS73101DBV | Package_TO_SOT_SMD:SOT-23-5 | U3 |
| 1 | VIN | TestPoint:TestPoint_Pad_D2.0mm | VAA1 |
| 1 | ~ | Custom:USB3.1 TYPE-C 16PF-020-2 | USB-C-1 |
Questions
How big is the Head3 PCB?
It measures 50.2 × 19.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Head3 use?
77 parts, built around the DW01A, FS8205A, TP4056-42-ESOP8 and TPS73101DBV. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Head3 KiCad files?
From the kntzn/head repository on GitHub, at the commit this page was made from: the board is head3.kicad_pcb and its schematic head3.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Head3 design in my own project?
Its repository states no licence, so its author keeps all rights: ask kntzn before reusing the design.
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