2 layers100 × 100 mm
2 layers95.3 × 95.3 mm
CPU
f4deb/Kicad- Size
- 95.3 × 95.3 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 90
- Nets
- 184
- Pads
- 561
- Tracks, vias
- 2,090, 254
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 12 May 2026
- Updated
- 20 Aug 2026
Overview
CPU is an open-source printed circuit board by f4deb, from the f4deb/Kicad repository on GitHub. It is a 2-layer board of 95.3 × 95.3 mm with 90 parts on 184 nets, routed with 2,090 tracks and 254 vias.
It is built around the 74HC244D, ESP32-WROOM-32 and TJA1051T, with the 74HC02, AT24CS01-SSHM-B and FT4232HL among its other parts. Its parts include 35 resistors, 20 capacitors, 14 ICs, 6 connectors and 5 diodes. It belongs with the ESP32 boards of this library.
Main components
12
74HC244D
SO-20-300mil-40℃~+125℃ 160uA 2 2V~6V 4 6mA 6mA 74HC 9ns@5V,15pF Tri-State Unidirectional SOIC-20-300mil Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffers, Drivers, Receivers, Transceivers
ESP32-WROOM-32
SMD,18x25.5mm-40℃~+85℃ -98dBm 2.4GHz 2.7V~3.6V 20dBm Bluetooth4.2 ESP32-DOWDQ6 UART、SDIO、SPI、I2C、GPIO、PWM、ADC、DAC SMD,25.5x18mm WiFi Modules ROHSEspressif SystemsWiFi Modules
TJA1051T
SOIC-8-40℃~+150℃ 2.5mA 4.5V~5.5V 5Mbps 70mA CAN Transceiver SOIC-8 CAN Transceivers ROHSNXP SemiconductorsCAN Transceivers74HC02
-- Logic Gates ROHSonsemiLogic GatesAT24CS01-SSHM-B
SOIC-8-40℃~+85℃ 1.7V~5.5V 1Kbit 1MHz 5ms I2C SOIC-8 EEPROM ROHSMicrochip TechnologyEEPROM
FT4232HL
QFP64Quad High Speed USB to Multipurpose UART/MPSSE ICFTDIUncategorised
LM1117DT-2.5
TO-252-30℃~+125℃ 1 1.2V@(800mA) 15V 2.5V 5mA 75dB@(120Hz) 800mA Fixed Over Current Protection、Thermal Shutdown、ESD Protection Positive TO-252-3 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
PCA9306D
SO-8-40℃~+105℃ 1 1.8V~5.5V 1V~3.6V 2 2Mbps Automatic direction detection、Output enable high-impedance Bidirectional Level translator Open-drain SMBus、I2C SO-8 Translators, Level Shifters ROHSNXP SemiconductorsTranslators, Level ShiftersPCF8563T/5
SO-8-40℃~+85℃ 0.25uA 1V~5.5V Battery low-voltage detection、Programmable clock output、Alarm function、Countdown timer I2C Yes SO-8 Real Time Clocks ROHSNXP SemiconductorsReal Time Clocks
SAA1064T
SO-24SO-24 New Arrivals ROHSNXP SemiconductorsUncategorised
TCA9544APW
TSSOP-20-40℃~+85℃ 1.65V~5.5V 10uA 1ns@50pF 2uA 7mA Level shifting、Hot-swap protection Single Supply TSSOP-20 Signal Switches, Multiplexers, Decoders ROHSTexas InstrumentsSignal Switches, Multiplexers, Decoders
BC807
SOT-23-65℃~+150℃ 1 PNP 100 100nA 345mW 45V 500mA 5V 700mV 80MHz PNP SOT-23 Bipolar (BJT) ROHSNexperiaBipolar (BJT)
README
README.mdKicad
Parts
90| Qty | Value | Footprint | References |
|---|---|---|---|
| 6 | 0 | Resistor_SMD:R_0603_1608Metric | R207, R210, R212, R214, R216, R218 |
| 6 | 100n | Capacitor_SMD:C_0603_1608Metric | C302, C303, C401, C403, C404, C601 |
| 6 | 10µ/10V | Capacitor_Tantalum_SMD:CP_EIA-3216-12_Kemet-S_HandSolder | C301, C304, C305, C407, C408, C409 |
| 6 | 2k2 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R208, R209, R211, R213, R215, R217 |
| 5 | 330 | Resistor_SMD:R_0603_1608Metric | R204, R411, R412, R413, R414 |
| 4 | 2.2K | Resistor_SMD:R_0603_1608Metric | R202, R203, R205, R206 |
| 3 | 10k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R402, R403, R404 |
| 3 | 10k | Resistor_SMD:R_0603_1608Metric | R401, R415, R416 |
| 2 | 10F/2.7V | Capacitor_THT:CP_Radial_Tantal_D10.5mm_P5.00mm | C201, C202 |
| 2 | 27P | Capacitor_SMD:C_0603_1608Metric | C405, C406 |
| 2 | 2k2 | Resistor_SMD:R_0603_1608Metric | R219, R220 |
| 2 | 39µH | Capacitor_SMD:C_2220_5750Metric | L401, L402 |
| 2 | BSR19 | Package_TO_SOT_SMD:SOT-23 | Q601, Q602 |
| 2 | Conn_02x20_Odd_Even | Connector_PinSocket_2.54mm:PinSocket_2x20_P2.54mm_Vertical | J501, J502 |
| 2 | LED_Dual_KAK | LED_SMD:LED_Kingbright_KPA-3010_3x2x1mm | D403, D404 |
| 2 | ~ | Connector_PinSocket_2.54mm:PinSocket_2x05_P2.54mm_Horizontal | J601, J602 |
| 1 | 100n | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C410 |
| 1 | 10p | Capacitor_SMD:C_0603_1608Metric | C203 |
| 1 | 10µ/10V | Capacitor_Tantalum_SMD:CP_EIA-3216-10_Kemet-I | C402 |
| 1 | 120 | Resistor_SMD:R_1206_3216Metric | R410 |
| 1 | 12Mhz | Crystal:Crystal_SMD_EuroQuartz_MQ-4Pin_7.0x5.0mm_HandSoldering | Y401 |
| 1 | 12k | Resistor_SMD:R_0603_1608Metric | R407 |
| 1 | 150 | Resistor_SMD:R_0603_1608Metric | R201 |
| 1 | 1k | Resistor_SMD:R_0603_1608Metric | R406 |
| 1 | 2.7n | Capacitor_SMD:C_0603_1608Metric | C602 |
| 1 | 2K | Resistor_SMD:R_0603_1608Metric | R301 |
| 1 | 2K2 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R405 |
| 1 | 32.278kHz | Crystal:Crystal_SMD_Abracon_ABS25-4Pin_8.0x3.8mm | Y201 |
| 1 | 74HC02 | Package_SO:SOIC-14_3.9x8.7mm_P1.27mm | U405 |
| 1 | 74HC244 | Package_SO:TSSOP-20_4.4x5mm_P0.5mm | U406 |
| 1 | 93C46 | Package_SO:SOIC-8_5.3x5.3mm_P1.27mm | U404 |
| 1 | AT24CS01-SSHM | Package_SO:SOIC-8_5.3x5.3mm_P1.27mm | U207 |
| 1 | BC807 | Package_TO_SOT_SMD:SOT-23 | Q402 |
| 1 | BC817 | Package_TO_SOT_SMD:SOT-23 | Q401 |
| 1 | Conn_01x04 | Connector_JST:JST_GH_SM04B-GHS-TB_1x04-1MP_P1.25mm_Horizontal | J102 |
| 1 | D_Schottky | Diode_SMD:D_2010_5025Metric_Pad1.52x2.65mm_HandSolder | D201 |
| 1 | ESP32-WROOM-32 | RF_Module:ESP32-WROOM-32 | U401 |
| 1 | FT4232H | Package_QFP:LQFP-64_10x10mm_P0.5mm | U402 |
| 1 | LM1117DT-2.5 | Package_TO_SOT_SMD:TO-252-3_TabPin2 | U301 |
| 1 | LM75A | Package_SO:MSOP-8_3x3mm_P0.65mm | U201 |
| 1 | MCP23017_SS | Package_SO:SSOP-28_5.3x10.2mm_P0.65mm | U205 |
| 1 | PCA9306 | Package_SO:VSSOP-8_2.3x2mm_P0.5mm | U202 |
| 1 | PCF8563T | Package_SO:MSOP-8_3x3mm_P0.65mm | U203 |
| 1 | RED | LED_SMD:LED_0603_1608Metric | D202 |
| 1 | RED LED | LED_SMD:LED_0603_1608Metric | D301 |
| 1 | SAA1064T | Package_SO:SOP-24_7.5x15.4mm_P1.27mm | U601 |
| 1 | SW_Push_45deg | Button_Switch_THT:SW_Tactile_SKHH_Angled | SW102 |
| 1 | SW_Push_45deg | Button_Switch_SMD:SW_SPST_CK_RS282G05A3 | SW101 |
| 1 | TCA9544A | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U204 |
| 1 | TJA1051T | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U403 |
| 1 | USB_B_Micro | Connector_USB:USB_Micro-B_Amphenol_10118194-0001LF_Horizontal | J101 |
Questions
How big is the CPU PCB?
It measures 95.3 × 95.3 mm and has 2 copper layers, 1.6 mm thick.
What parts does the CPU use?
90 parts, built around the 74HC244D, ESP32-WROOM-32, TJA1051T and 74HC02. 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 CPU KiCad files?
From the f4deb/Kicad repository on GitHub, at the commit this page was made from: the board is CPU_ESP/V0.3/CPU/CPU.kicad_pcb and its schematic ARP-RER-NG_Etuve-IN/ARP-RER-NG_Etuve-IN/ARP-RER-NG_Etuve-IN.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the CPU design in my own project?
Its repository states no licence, so its author keeps all rights: ask f4deb before reusing the design.
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