4 layers53.3 × 73.7 mm
Tag breakout l432-1v8-v1
tag-designs/hardware
Hardware designs for tags and bases
54 parts2CERN-OHL-P-2.0
4 layers53.3 × 73.7 mm
Tag breakout l432-u375-lipo v1
tag-designs/hardware2Hardware designs for tags and bases
- Size
- 53.3 × 73.7 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 55
- Nets
- 77
- Pads
- 260
- Tracks, vias
- 489, 87
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 27 Apr 2026
- Updated
- 5 Nov 2026
Overview
Tag breakout l432-u375-lipo v1 is an open-source printed circuit board by tag-designs, from the tag-designs/hardware repository on GitHub, published under the CERN-OHL-P-2.0 licence. It is a 4-layer board of 53.3 × 73.7 mm with 55 parts on 77 nets, routed with 489 tracks and 87 vias.
It is built around the STM32U375KGU6, SN74LVC1T45DCKRE4 and AP2112K-1.8TRG1(MS), with the RV-3028-C7-32.768KHZ-1PPM-TA-QC, SIP32432DR3-T1GE3 and TS-1187A-C-E-B among its other parts. Its parts include 24 capacitors, 11 ICs, 8 resistors, 6 connectors and 3 diodes. It belongs with the power and interfaces and adapters boards and the STM32 boards of this library.
Main components
11
STM32U375KGU6
UFQFPN-32(5x5)Undervoltage detection (BOR/LVD/LVR/LVI)、Built-in general-purpose timer、Hardware CRC、Integrated LDO、Calendar function、True random number generator (TRNG)、Hardware ECC check、Hardware parity check、Independent watchdog (IWDG)、Window watchdog (WWDG) UFQFPN-32(5x5) Microcontrollers (MCU/MPU/SOC) ROHSSTMicroelectronicsMicrocontrollers (MCU/MPU/SOC)
SN74LVC1T45DCKRE4
SC-70-6-40℃~+85℃ 1 1 1.65V~5.5V 1.65V~5.5V 24mA 24mA 420Mbps Bidirectional Level translator Power-off protection、Output enable high-impedance Tri-State SC-70-6 Translators, Level Shifters ROHSTexas InstrumentsTranslators / Level Shifters
AP2112K-1.8TRG1(MS)
SOT-23-5-40℃~+85℃@(Ta) 1 1.8V 2uA 40uVrms 570mV@(600mA) 600mA 6V 75dB@(1kHz) Fixed Over Current Protection、Over Temperature Protection、Enable Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSMSKSEMIVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
RV-3028-C7-32.768KHZ-1PPM-TA-QC
SMD3215-8P-40℃~+85℃ 1.1V~5.5V 45nA 45nA Backup power management and battery charging、InsideSRAM/NVRAM、Timestamp function、Programmable clock output、Alarm function、Power-off retention of registers、Locking and tamper-proof Built-in I2C Yes SMD3215-8P Real Time Clocks ROHSMicro CrystalReal Time ClocksSIP32432DR3-T1GE3
SC-70-6-40℃~+85℃ 1 1.4A 1.5V~5.5V 147mΩ Active Low High Side Switch Reverse voltage protection、Reverse current blocking SC-70-6 Power Distribution Switches ROHSVishay IntertechnologyPower Distribution Switches
TS-1187A-C-E-B
SMD-4P,5.1x5.1mm-30℃~+85℃ 100,000 cycles 12V 2.5mm 2.6N 5.1mm 5.1mm 50mA Gold No Round Button SPST Surface Mount,Vertical Without Bracket SMD-4P,5.1x5.1mm Tactile Switches ROHSXKB ConnectionTactile Switches
USBLC6-2P6
SOT-666-6-40℃~+125℃ 150nA 17V 2 3.5pF 5.25V 5A@8/20us 6V ESD IEC 61000-4-2 Unidirectional SOT-666-6 ESD and Surge Protection (TVS/ESD) ROHSSTMicroelectronicsESD And Surge Protection (TVS/ESD)
XC6206P332MR-G
UncategorisedUnknown maker
1N5819WS
SOD-3231 Independent 1A 25A 40V 500uA@40V 600mV@1A SOD-323 Schottky Diodes ROHSGuangdong HottechSchottky Diodes
KT-0805G
0805-40℃~+85℃ 100mW 120° 2.6V~3.1V 430mcd 513nm~528nm 525nm 5mA Discrete Diode Emerald Green Water Clear 0805 LED Indication - Discrete ROHSHubei KENTO ElecLED Indication - Discrete
KT-0603R
0603-40℃~+85℃ 1.6mm x 0.8mm square LED 1.8V~2.4V 120° 20mA 300mcd 40mW 615nm~630nm 645nm Discrete Diode Red Water Clear 0603 LED Indication - Discrete ROHSHubei KENTO ElecLED Indication - Discrete
README
README.mdTag Designs: Hardware
Board and mechanical designs for the ultralight archival data loggers (tags) documented at https://tag-designs.github.io/.
| Path | Holds |
|---|---|
BoardDesigns/ | KiCad schematics and layouts for the tags and base boards, with their KiBot fabrication configurations |
Mechanical/ | OpenSCAD sources for cases, carriers and harness jigs |
docs/ | The hardware documentation site, published at https://tag-designs.github.io/hardware/ |
STM32_open_pin_data | ST's pin-data submodule, used by the design-rule helpers |
Board designs reach the shared symbol and footprint libraries through
${KIPRJMOD}/../../, so a board is tied to its depth in the directory tree.
Moving one between directories is more than a move.
Regenerating the figures
The documentation's board renders and schematic PDFs are generated from the KiCad files and committed, because the workflow that publishes the site has no KiCad in it. After editing a board:
cmake -S BoardDesigns -B build-boards
cmake --build build-boards --target board-docsBoardDesigns/REGENERATING.md covers the
targets, the three checks that guard the figures, what each of their messages
means, and why generation is not done in CI. Read it before chasing a render
that looks wrong — in particular, kicad-cli reports nothing at all when it
cannot find a 3D model.
License
Copyright © 2018–2026 The Trustees of Indiana University.
This source describes Open Hardware and is licensed under the CERN Open
Hardware Licence Version 2 — Permissive (CERN-OHL-P-2.0). You may
redistribute and modify this source and make products using it under the terms
of that licence, whose full text is in LICENSE and at
https://ohwr.org/cern_ohl_p_v2.txt.
This source is distributed WITHOUT ANY EXPRESS OR IMPLIED WARRANTY, INCLUDING OF MERCHANTABILITY, SATISFACTORY QUALITY AND FITNESS FOR A PARTICULAR PURPOSE. Please see the licence for applicable conditions.
The STM32_open_pin_data submodule is ST's and carries its own license. The
software that runs on these boards lives in a separate repository under the MIT
License; see the
project licensing summary.
Parts
55| Qty | Value | Footprint | References |
|---|---|---|---|
| 15 | 0.1uF | Capacitor_SMD:C_0402_1005Metric | C2, C3, C5, C6, C7, C9, C11, C101, C102, C103, C107, C109, C110, C111, C113 |
| 8 | 1uF | Capacitor_SMD:C_0402_1005Metric | C1, C12, C104, C105, C106, C108, C112, C114 |
| 3 | 100 | Resistor_SMD:R_0402_1005Metric | R1, R2, R106 |
| 3 | 10K | Resistor_SMD:R_0402_1005Metric | R3, R7, R105 |
| 2 | Conn_01x17 | library:PinHeader_1x17_P2.54mm_Vertical_Staggered | J3, J4 |
| 2 | SN74LVC1T45DCK | Package_TO_SOT_SMD:SOT-363_SC-70-6 | U7, U8 |
| 2 | TestPoint | TestPoint:TestPoint_Pad_D2.5mm | TP1, TP2 |
| 1 | 2.2K | Resistor_SMD:R_0402_1005Metric | R104 |
| 1 | 200 | Resistor_SMD:R_0402_1005Metric | R107 |
| 1 | 4.7uF | Capacitor_SMD:C_0402_1005Metric | C8 |
| 1 | AP2112K-1.8 | Package_TO_SOT_SMD:SOT-23-5 | U10 |
| 1 | Conn_01x02_Male | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J2 |
| 1 | Conn_01x04_Female | library:JST_XH_B04B-XH-AM_1x04_P2.50mm_Vertical | J1 |
| 1 | Conn_02x05_Odd_Even | library:FTSH-105-01-F-D-K | J102 |
| 1 | D_Schottky | Diode_SMD:D_SOD-323 | D4 |
| 1 | LED-GREEN | LED_SMD:LED_0805_2012Metric | D1 |
| 1 | LED-RED | LED_SMD:LED_0603_1608Metric | D105 |
| 1 | Q_NPN_BEC | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | RV-3028-C7 | library:RV-8803-C7 | U6 |
| 1 | SiP32432DR3 | Package_TO_SOT_SMD:SOT-363_SC-70-6 | U2 |
| 1 | TPS7A0218PDBVR | Package_TO_SOT_SMD:SOT-23-5 | U11 |
| 1 | Tactile Switch | library:SW_SPST_TS_1187 | U105 |
| 1 | USBLC6-2P6 | Package_TO_SOT_SMD:SOT-666 | U4 |
| 1 | USB_B_Mini | Connector_USB:USB_Mini-B_Lumberg_2486_01_Horizontal | J104 |
| 1 | XC6206 | Package_TO_SOT_SMD:SOT-23-3 | U1 |
| 1 | stm32U375 | Package_DFN_QFN:UFQFPN-32-1EP_5x5mm_P0.5mm_EP3.5x3.5mm | U3 |
| 1 | stm32l432 | Package_DFN_QFN:UFQFPN-32-1EP_5x5mm_P0.5mm_EP3.5x3.5mm | U5 |
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Questions
How big is the Tag breakout l432-u375-lipo v1 PCB?
It measures 53.3 × 73.7 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Tag breakout l432-u375-lipo v1 use?
55 parts, built around the STM32U375KGU6, SN74LVC1T45DCKRE4, AP2112K-1.8TRG1(MS) and RV-3028-C7-32.768KHZ-1PPM-TA-QC. 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 Tag breakout l432-u375-lipo v1 KiCad files?
From the tag-designs/hardware repository on GitHub, at the commit this page was made from: the board is BoardDesigns/Bases/tag-breakout-l432-u375-lipo-v1/tag-breakout-l432-u375-lipo-v1.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Tag breakout l432-u375-lipo v1 design in my own project?
Its repository publishes it under the CERN-OHL-P-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).