Phq u
About the Phq u PCB
Phq u is an open source ESP32 PCB design by illdefined, published on GitHub under the CERN-OHL-S-2.0 license. It is a 4-layer board measuring 130.4 × 75.4 mm, with 127 components from 65 distinct parts.
Its main chip is the ESP32-C3, from the ESP32 family. Other key parts include the i7A4W033A033V-0C1, TMCS1108A1U, ADS7142, RPMH3.3-0.5 and ECMF02-2AMX6. By type, the board carries 40 capacitors, 37 resistors, 15 diodes, 8 ICs, 8 fuses and 7 connectors.
It belongs with the power & battery designs in this gallery.
From the project
Step‐down power converter
Main components on the Phq u
Phq u bill of materials (BOM)
127 components, 65 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | i7A4W033A033V-0C1 i7A4W033A033V | i7A4W-0C1 | U1 |
| 2 | TMCS1108A1U | SOIC-8_3.9x4.9mm_P1.27mm | U2, U3 |
| 2 | ADS7142 | Texas_R-PUQFN-N10 | U4, U7 |
| 1 | RPMH3.3-0.5 | Converter_DCDC_RECOM_RPMx.x-x.0 | U5 |
| 1 | ESP32-C3 | ESP32-C3-MINI-1U | U6 |
| 1 | ECMF02-2AMX6 | ST_UQFN-6L_1.5x1.7mm_Pitch0.5mm | U8 |
| 1 | NX138AKR Nexperia | SOT-23 | Q1 |
| 1 | 18…56 V | Phoenix_1987737 | J1 |
| 1 | Output voltage | PinHeader_2x12_P2.00mm_Vertical | J2 |
| 1 | MCU bypass | PinHeader_2x01_P2.00mm_Vertical | J3 |
| 1 | 3.3…24 V | Phoenix_1987737 | J4 |
| 1 | MCU disable | PinHeader_2x01_P2.00mm_Vertical | J5 |
| 1 | LED | PinHeader_1x04_P2.00mm_Vertical | J7 |
| 1 | USB-C | USB4120 | J8 |
| 4 | CB61F30A 30 A Eaton | Fuse_2410_20A | F1, F2, F3, F4 |
| 2 | 0ZCM0001FF2G 10 mA Bel Fuse | Fuse_0603_1608Metric | F5, F6 |
| 2 | MF-FSML050/8-2 500 mA Bourns | Fuse_0603_1608Metric | F7, F8 |
| 2 | 2036-07-SM 75 V Bourns | 2036-NN-SM | GD1, GD2 |
| 1 | B72540E0400K062 56 V TDK | C_2220_5650Metric | RV1 |
| 4 | ZV60K1206121NIR1 85V Bourns | C_1206_3216Metric | RV2, RV3, RV4, RV5 |
Show 45 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | B72530T6170K062 24 V TDK | C_1210_3225Metric | RV6 |
| 1 | TMP61 | R_0402_1005Metric | TH1 |
| 1 | 1.5SMBJ54A-H 54 V Bourns | D_SMB | D1 |
| 11 | DF2S5M4CT 3V3 Toshiba | D_0402_1005Metric | D2, D3, D5, D8, D9, D10, D11, D12 +3 |
| 1 | SMA6F24A 24 V STMicroelectronics | D_SMA | D4 |
| 1 | SS1FN6 Schottky diode Vishay | D_SMF | D6 |
| 1 | UCLAMP2501T.TCT 2V5 Semtech | D_0402_1005Metric | D7 |
| 1 | 320µ | CMX1211Z321B-10 | L1 |
| 1 | 74404042150 15µ Würth | WE-LQS_4018 | L2 |
| 5 | 12101C475K4T2A 4µ7 Kyocera AVX | C_1210_3225Metric | C1, C2, C3, C6, C7 |
| 3 | 100 n | C_0402_1005Metric | C4, C5, C16 |
| 8 | JMK105B7104KV-F 100 n Taiyo Yuden | C_0402_1005Metric | C8, C10, C11, C14, C18, C21, C22, C25 |
| 8 | GRJ31CZ72A475KE01L 4µ7 Murata | C_1206_3216Metric | C9, C12, C13, C28, C29, C30, C31, C32 |
| 2 | HMK107B7104KA 100n Taiyo Yuden | C_0603_1608Metric | C15, C33 |
| 1 | GRM155R71E104KE14J 100n Murata | C_0402_1005Metric | C17 |
| 5 | GRM21BR71A475KE51L 4µ7 Murata | C_0805_2012Metric | C19, C20, C23, C24, C26 |
| 1 | UHW1J391MHD6 390 µ Nichicon | CP_Radial_D12.5mm_P5.00mm | C27 |
| 1 | GRM155R71H104KE14D 100n Murata | C_0402_1005Metric | C34 |
| 5 | 12065C475KAT2A 4µ7 Kyocera AVX | C_1206_3216Metric | C35, C36, C37, C38, C39 |
| 1 | UHV1V561MPD 560 µ Nichicon | CP_Radial_D10.0mm_P5.00mm | C40 |
| 1 | 820k | R_0603_1608Metric | R1 |
| 1 | 8k66 | R_0603_1608Metric | R2 |
| 1 | 5k23 | R_0603_1608Metric | R3 |
| 1 | 2k1 | R_0603_1608Metric | R4 |
| 1 | 1k13 | R_0603_1608Metric | R5 |
| 1 | 806 | R_0603_1608Metric | R6 |
| 1 | 560R | R_0402_1005Metric | R7 |
| 1 | 649 | R_0603_1608Metric | R8 |
| 1 | 536 | R_0603_1608Metric | R9 |
| 1 | 287 | R_0603_1608Metric | R10 |
| 1 | 261 | R_0603_1608Metric | R11 |
| 1 | 232 | R_0603_1608Metric | R12 |
| 1 | 41R2 | R_0603_1608Metric | R13 |
| 1 | 3M9 | R_1206_3216Metric | R15 |
| 1 | 499k | R_0805_2012Metric | R16 |
| 2 | 10 k | R_0402_1005Metric | R17, R31 |
| 2 | 5M | R_1206_3216Metric | R18, R19 |
| 1 | 2M7 | R_1206_3216Metric | R20 |
| 1 | 499 k | R_0805_2012Metric | R21 |
| 4 | 45k3 | R_0402_1005Metric | R22, R28, R30, R32 |
| 4 | 100k | R_0402_1005Metric | R23, R26, R29, R33 |
| 4 | 5k1 | R_0402_1005Metric | R24, R25, R36, R37 |
| 1 | 10 m | R_0805_2012Metric | R27 |
| 2 | 15 R | R_0402_1005Metric | R34, R35 |
| 1 | 68 R | R_0402_1005Metric | R38 |
Phq u design files
The KiCad project lives in the illdefined/phq-u repository on GitHub; these links point at the commit this page was built from.
- Layoutphq-u.kicad_pcb
- Schematicphq-u.kicad_sch
Phq u: common questions
What microcontroller does the Phq u use?
The Phq u is built around the ESP32-C3, from the ESP32 family.
How big is the Phq u PCB?
The Phq u measures 130.4 × 75.4 mm, has 4 copper layers and is 1.55 mm thick.
How many components are on the Phq u?
127 components, from 65 distinct parts. The full bill of materials is listed on this page.
Where can I download the Phq u design files?
From the illdefined/phq-u repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Phq u design in my own project?
Yes, under the terms of its CERN-OHL-S-2.0 license, which illdefined chose for the repository.
Can I test firmware for the Phq u without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.
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