2 layers111.8 × 37.5 mm
4 layers220 × 55 mm
Precision Clock
TJ71PL/Precision-Clock- Size
- 220 × 55 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 153
- Nets
- 167
- Pads
- 605
- Tracks, vias
- 1,051, 373
- Pours
- 11
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 10 Oct 2025
- Updated
- 4 Nov 2026
Overview
Precision Clock is an open-source printed circuit board by TJ71PL, from the TJ71PL/Precision-Clock repository on GitHub. It is a 4-layer board of 220 × 55 mm with 153 parts on 167 nets, routed with 1,051 tracks and 373 vias.
It is built around the STM32G0B0CET6, TLC5926IDW and W25Q32JVZPIQ, with the TEPT5700, SA15-11SURKWA and MAX-M10S among its other parts. Its parts include 42 capacitors, 41 resistors, 18 diodes, 15 ICs and 4 transistors. It belongs with the lEDs and displays boards and the STM32 boards of this library.
Main components
12
STM32G0B0CET6
LQFP-48(7x7)-40℃~+85℃ 12bit 144KB 2V~3.6V 32 Bit 43 512KB 64MHz ARM Cortex-M0+ Built-in+External FLASH LQFP-48(7x7) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)
TLC5926IDW
SOIC-24-300mil-40℃~+125℃ 120mA 16 17V 30MHz 3V~5.5V 6% Built-in DC-DC Over-Temperature Protection (OTP) SOIC-24-300mil LED Drivers ROHSTexas InstrumentsLED Drivers
W25Q32JVZPIQ
WSON-8-EP(5x6)-40℃~+85℃ 100,000 cycles 10uA 133MHz 2.7V~3.6V 20 Years 32Mbit 3ms SPI WSON-8-EP(5x6) NOR FLASH ROHSWinbondNOR FLASH
TEPT5700
插件,P=2.54mm-40℃~+85℃ 3nA Light Intensity 插件,P=2.54mm Ambient Light Sensors ROHSVishay IntertechnologyAmbient Light SensorsSA15-11SURKWA
-- LED Segment Displays ROHSKingbrightLED Segment Displays
MAX-M10S
LCC-18_10.1X9.7LCC-18_10.1X9.7 New Arrivals ROHSu-bloxUncategorised
ESDALC6V1-1U2
0201-40℃~+125℃ 1 100nA 12pF 20W@8/20us 2A@8/20us 3V 6.1V 8V ESD IEC 61000-4-2 Unidirectional 0201 ESD and Surge Protection (TVS/ESD) ROHSSTMicroelectronicsESD And Surge Protection (TVS/ESD)
DMN3008SFG
PowerDI3333-8-55℃~+150℃ 1 N-channel 2.1W 3.69nF 30V 4.4V 459pF 5.5mΩ@4.5V 62A 86nC@10V PowerDI3333-8 MOSFETs ROHSDiodes IncorporatedMOSFETs
B3U-1000P
SMD,3x2.5mm-25℃~+70℃ 1.53N 1.6mm 12V 2.5mm 3mm 50mA Round Button SMD(SMT) Tab SPST Surface Mount,Vertical SMD,3x2.5mm Tactile Switches ROHSOmronTactile Switches
CR2032
-- Unclassified goods ROHSMaxellUncategorised
ESDA6V1SC5
SOT-23-5L-40℃~+125℃ 18A@8/20us 190pF 2uA 400W 5.25V 6.1V 6.1V ESD Four channels IEC 61000-4-2 Unidirectional SOT-23-5L ESD and Surge Protection (TVS/ESD) ROHSSTMicroelectronicsESD And Surge Protection (TVS/ESD)
PS1740P02CE
插件,D=17mm-10℃~+70℃ 17mm 30V 4.9mm 4kHz 60dB Passive (Externally Driven) Piezoelectric 插件,D=17mm Buzzers ROHSTDKBuzzers
README
electronics/README.mdPrecision-Clock
Parts
153| Qty | Value | Footprint | References |
|---|---|---|---|
| 15 | 100n | Capacitor_SMD:C_0402_1005Metric | C2, C3, C5, C6, C7, C8, C12, C17, C18, C20, C21, C22, C23, C24, C33 |
| 15 | 10K | Resistor_SMD:R_0402_1005Metric | R6, R7, R8, R9, R10, R11, R14, R19, R30, R31, R32, R34, R35, R36, R38 |
| 12 | ESDALC6V1-1U2 | precision_clock:ST ESDALC6V1-1U2 | D3, D4, D5, D7, D9, D10, D13, D14, D15, D16, D17, D18 |
| 10 | 10u | Capacitor_SMD:C_0603_1608Metric | C10, C11, C13, C32, C35, C37, C39, C40, C41, C42 |
| 9 | 10n | Capacitor_SMD:C_0402_1005Metric | C1, C25, C26, C27, C28, C29, C30, C31, C34 |
| 8 | 5.1K | Resistor_SMD:R_0402_1005Metric | R2, R3, R4, R5, R12, R16, R21, R41 |
| 6 | SA15-11SURKWA | precision_clock:SA15-11SURKWA | U10, U11, U12, U13, U14, U15 |
| 5 | 150R | Resistor_SMD:R_0402_1005Metric | R15, R17, R18, R22, R29 |
| 5 | 330R | Resistor_SMD:R_0402_1005Metric | R13, R23, R28, R33, R37 |
| 5 | LED | precision_clock:LED_LiteON_LTST-C281KGKT | D2, D6, D8, D11, D12 |
| 5 | M3 | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4, H5 |
| 4 | 1u | Capacitor_SMD:C_0402_1005Metric | C9, C16, C36, C38 |
| 3 | 750R | Resistor_SMD:R_0402_1005Metric | R25, R26, R27 |
| 3 | DMN3008SFG | Package_SON:Diodes_PowerDI3333-8 | Q1, Q2, Q3 |
| 3 | LOGO | LOGO | G***, G***, G*** |
| 3 | TLC5926 | Package_SO:HTSSOP-24-1EP_4.4x7.8mm_P0.65mm_EP3.2x5mm | U6, U7, U8 |
| 2 | 12.5p | Capacitor_SMD:C_0402_1005Metric | C14, C19 |
| 2 | B3U-1000P | Button_Switch_SMD:SW_SPST_B3U-1000P | SW2, SW3 |
| 2 | PEC09-2320F-T0015 | precision_clock:RotaryEncoder_Bourns_Horizontal_PEC09-2xxxF-Txxxx | SW1, SW4 |
| 1 | 100K | Resistor_SMD:R_0402_1005Metric | R40 |
| 1 | 10R | Resistor_SMD:R_0603_1608Metric | R1 |
| 1 | 120R@100MHz | Resistor_SMD:R_0402_1005Metric | FB1 |
| 1 | 22R | Resistor_SMD:R_0402_1005Metric | R24 |
| 1 | 27nH 5% | Inductor_SMD:L_0402_1005Metric | L1 |
| 1 | 39K | Resistor_SMD:R_0402_1005Metric | R39 |
| 1 | 4.7u | Capacitor_SMD:C_0603_1608Metric | C15 |
| 1 | 47pF | Capacitor_SMD:C_0402_1005Metric | C4 |
| 1 | 50R SMA_Conn | Connector_Coaxial:SMA_Molex_73251-1153_EdgeMount_Horizontal | J1 |
| 1 | 5mR | Resistor_SMD:R_0805_2012Metric | R20 |
| 1 | ALS | TestPoint:TestPoint_Pad_D1.0mm | TP3 |
| 1 | AP2127K-3.3 | Package_TO_SOT_SMD:SOT-23-5 | U5 |
| 1 | AP33771C | precision_clock:W-DFN3030-14 (Type A1) Diodes | U9 |
| 1 | BZ | TestPoint:TestPoint_Pad_D1.0mm | TP4 |
| 1 | CR2032 | precision_clock:Battery_holder_CR2032_SMD | BT1 |
| 1 | Conn_ST_STDC14 | precision_clock:ST STDC14 | J3 |
| 1 | ECS-TXO-2520MV | precision_clock:ECS_TXO-2520MV | Y1 |
| 1 | ESDA6V1SC5 | Package_TO_SOT_SMD:SOT-23-5 | D1 |
| 1 | GPS_BCKP | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP2 |
| 1 | HDC1080 | Package_SON:Texas_PWSON-N6 | U2 |
| 1 | MAX-M10S | RF_GPS:ublox_MAX | U1 |
| 1 | MCU_RTC | Jumper:SolderJumper-2_P1.3mm_Open_TrianglePad1.0x1.5mm | JP1 |
| 1 | PS1740P02CE | precision_clock:TDK PS1740P02CE | LS1 |
| 1 | Q13MC14620002 | Crystal:Crystal_SMD_SeikoEpson_MC146-4Pin_6.7x1.5mm | Y2 |
| 1 | STM32G0B0CET6 | Package_QFP:LQFP-48_7x7mm_P0.5mm | U4 |
| 1 | TEPT5700 | LED_THT:LED_D5.0mm_Clear | Q4 |
| 1 | TH_SCL | TestPoint:TestPoint_Pad_D1.0mm | TP1 |
| 1 | TH_SDA | TestPoint:TestPoint_Pad_D1.0mm | TP2 |
| 1 | USB_C_Receptacle | precision_clock:USB_C_Receptacle_Molex_105450-0101 | J2 |
| 1 | W25Q32JVZP | Package_SON:WSON-8-1EP_6x5mm_P1.27mm_EP3.4x4.3mm | U3 |
The 147 most common of 153 parts.
Questions
How big is the Precision Clock PCB?
It measures 220 × 55 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Precision Clock use?
153 parts, built around the STM32G0B0CET6, TLC5926IDW, W25Q32JVZPIQ and TEPT5700. 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 Precision Clock KiCad files?
From the TJ71PL/Precision-Clock repository on GitHub, at the commit this page was made from: the board is electronics/Precision Clock.kicad_pcb and its schematic electronics/Precision Clock-backups/Precision Clock-2026-03-12_203712/Ambient Light Sensor.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Precision Clock design in my own project?
Its repository states no licence, so its author keeps all rights: ask TJ71PL before reusing the design.
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