Buddy board-MINI
About the Buddy board-MINI
Buddy board-MINI is an open source STM32 PCB design by prusa3d, published on GitHub. It is a 6-layer board measuring 105 × 70 mm, with 350 components from 95 distinct parts.
Its main chip is the MCU-STM32F407VGT6(LQFP100), from the STM32 family. Other key parts include the LAN8742A-CZ-TR, W25Q64JVSSIQ, LM25011MY/NOPB, NCP1117-3.3_SOT223 and AHCT125. By type, the board carries 129 capacitors, 98 resistors, 38 inductors, 34 diodes, 25 connectors and 13 ICs.
Main components on the Buddy board-MINI
Buddy board-MINI bill of materials (BOM)
350 components, 95 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | LAN8742A-CZ-TR | VQFN-24-1EP_4x4mm_P0.5mm_EP2.45x2.45mm_ThermalVias | U1 |
| 1 | W25Q64JVSSIQ | SOIC8-wide | U2 |
| 1 | LM25011MY/NOPB | SOP50P490X110-11N | U3 |
| 1 | NCP1117-3.3_SOT223 | SOT-223-3_TabPin2 | U4 |
| 1 | AHCT125 | Texas_S-PVQFN-N14_ThermalVias | U5 |
| 4 | TMC2209-LA | QFN-28_EP_5x5_Pitch0.5mm | U6, U7, U8, U9 |
| 1 | MCU-STM32F407VGT6(LQFP100) | LQFP-100_14x14mm_P0.5mm | U10 |
| 1 | ST25DV64K | TSSOP-8_4.4x3mm_P0.65mm | U11 |
| 1 | STMPS2141STR | SOT-23-5 | U12 |
| 1 | DT1140-04LP | DT1140-04LP | U13 |
| 2 | MMBF170 | SOT-23 | Q1, Q2 |
| 2 | PSMN2R6-40YS | SOT-669_LFPAK_alternate-numbers_VIA | Q3, Q4 |
| 1 | ASE-xxxMHz* | Oscillator_SMD_EuroQuartz_XO53-4Pin_5.0x3.2mm | X1 |
| 1 | Crystal | Crystal-3.2x2.5mm | Y2 |
| 1 | ECS-250-20-30B-AGL-TR | Crystal_SMD_Abracon_ABM3C-4Pin_5.0x3.2mm | Y4 |
| 1 | Conn_01x03 | PinHeader_1x03_P2.54mm_Vertical | J1 |
| 1 | 2,54 jumper | MEC | J1-jumper1 |
| 1 | 105017-0001 | USB-micro | J2 |
| 1 | HR911105A | HR911105A | J3 |
| 2 | faston | faston-hole-m | J4, J5 |
Show 75 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | Mini-DIN-4-KPJX | KPJX-4S | J6 |
| 5 | 70543-0003 | Pin_1x04-XL | J7, P7, P8, P9, P10 |
| 1 | 302-S141 | IDC-Header_2x07_P2.54mm_Vertical | J8 |
| 3 | 70543-0002 | Pin_1x03-XL | J9, P1, P2 |
| 1 | Conn_02x04_Odd_Even | PinHeader_2x04_P2.54mm_Vertical | J10 |
| 1 | UFL coaxial | UFL-MOLEX-73412-0114 | J11 |
| 1 | 67329-8000 | USB-A-vertical-MX-67329-8000 | J20 |
| 1 | Conn_01x05 | PinHeader_1x05_P2.54mm_Vertical | J21 |
| 1 | Conn_01x10 | MOLEX_559321010 | J23 |
| 2 | 70543-0001 | Pin_1x02-XL | P3, P4 |
| 2 | TBG-5-PW-2P/GN | PhoenixContact_MSTBVA-G_02x5.08mm_Vertical | P5, P6 |
| 2 | KEYSTONE 3568 | Fuse-Keystone-3557-2 | F1, F3 |
| 1 | fuse 7,5A | MEC | F1-fuse1 |
| 1 | fuse 3A | MEC | F3-fuse3 |
| 1 | TACTA-64N-F | TACT-90 | SW1 |
| 1 | NTCG104LH104JTDS | R_0402_1005Metric | TH1 |
| 18 | BAV99W | SOT-323_SC-70 | D1, D2, D7, D8, D20, D21, D25, D26 +10 |
| 6 | GRN | LED_0603 | D3, D4, D9, D13, D15, D17 |
| 3 | BAT54KFILM | D_SOD-523 | D5, D6, D24 |
| 2 | USBLC6-2P6 | SOT143B | D10, D22 |
| 1 | ESDA6V1L | SOT-23 | D11 |
| 2 | SK310A-TP | DO-214AC | D12, D14 |
| 1 | SMAJ28A | D_SMA | D18 |
| 1 | SK310A | DO-214AC | D19 |
| 36 | BLM18KG121TN1D | R_0603_1608Metric | L1, L2, L3, L4, L5, L6, L7, L8 +28 |
| 1 | BLM41PG600SN1L | R_1806_4516Metric | L12 |
| 1 | 15uH | VLS6045EX | L13 |
| 37 | 100n | C_0402_1005Metric | C1, C2, C3, C4, C6, C7, C9, C10 +29 |
| 1 | 10u* | C_0805_2012Metric | C5 |
| 29 | 100n | C_0603_1608Metric | C8, C14, C22, C23, C25, C26, C28, C29 +21 |
| 4 | 4.7uF | C_0603_1608Metric | C15, C24, C34, C36 |
| 2 | 30p | C_0402_1005Metric | C17, C56 |
| 1 | 4u7 | C_1206_3216Metric | C18 |
| 3 | 1u | C_0603_1608Metric | C19, C78, C117 |
| 1 | 4n7 | C_0402_1005Metric | C20 |
| 1 | 4u7 | C_0805_2012Metric | C21 |
| 5 | 10u | C_0805_2012Metric | C31, C33, C35, C37, C48 |
| 4 | 22n | C_0402_1005Metric | C43, C45, C73, C75 |
| 1 | 10p* | C_0402_1005Metric | C49 |
| 1 | 470p | C_0402_1005Metric | C57 |
| 4 | 100u | c_elec_6.3x7.7 | C60, C61, C90, C91 |
| 16 | 1n | C_0603_1608Metric | C64, C65, C66, C67, C68, C69, C70, C71 +8 |
| 2 | 10n | C_0402_1005Metric | C81, C82 |
| 1 | 100u | C_1206_3216Metric | C86 |
| 4 | 10u | C_1206_3216Metric | C92, C93, C121, C122 |
| 6 | 10p | C_0402_1005Metric | C104, C105, C123, C126, C127, C128 |
| 2 | 2,2u | C_0603_1608Metric | C106, C107 |
| 2 | 10u | C_0603_1608Metric | C116, C118 |
| 1 | 330u | CP_Elec_8x10.5 | C124 |
| 1 | 10n* | C_0402_1005Metric | C129 |
| 15 | 100R | R_0402_1005Metric | R1, R2, R18, R22, R23, R41, R42, R44 +7 |
| 5 | 100k | R_0402_1005Metric | R3, R4, R43, R46, R49 |
| 2 | 2k2 | R_0603_1608Metric | R5, R6 |
| 10 | 1k8 | R_0402_1005Metric | R7, R8, R9, R10, R55, R56, R59, R60 +2 |
| 4 | 2k37 | R_0402_1005Metric | R11, R12, R14, R15 |
| 6 | 4k7 | R_0402_1005Metric | R13, R16, R58, R77, R80, R85 |
| 4 | 620R | R_0603_1608Metric | R17, R88, R94, R95 |
| 1 | 1k | R_0603_1608Metric | R19 |
| 1 | 2k | R_0603_1608Metric | R20 |
| 4 | 1k | R_0402_1005Metric | R21, R64, R79, R82 |
| 6 | 33R | R_0402_1005Metric | R24, R25, R27, R32, R98, R99 |
| 12 | 10k | R_0402_1005Metric | R26, R33, R34, R35, R50, R52, R53, R54 +4 |
| 3 | 1k5 | R_0402_1005Metric | R28, R29, R30 |
| 1 | 12k1 | R_0402_1005Metric | R36 |
| 4 | 49.9R | R_0402_1005Metric | R37, R38, R39, R40 |
| 2 | 10k | R_0603_1608Metric | R45, R48 |
| 1 | 60m | R_2512_6332Metric | R51 |
| 8 | R22 | R_1206 | R65, R66, R67, R68, R73, R74, R75, R76 |
| 1 | 100R* | R_0402_1005Metric | R71 |
| 2 | 10k* | R_0402_1005Metric | R72, R97 |
| 1 | 1k* | R_0402_1005Metric | R83 |
| 2 | 0R | R_0402_1005Metric | R86, R92 |
| 1 | 47k | R_0402_1005Metric | R87 |
| 1 | 510R | R_0402_1005Metric | R91 |
| 1 | 330R | R_0402_1005Metric | R93 |
Buddy board-MINI design files
The KiCad project lives in the prusa3d/Buddy-board-MINI-PCB repository on GitHub; these links point at the commit this page was built from.
Buddy board-MINI: common questions
What microcontroller does the Buddy board-MINI use?
The Buddy board-MINI is built around the MCU-STM32F407VGT6(LQFP100), from the STM32 family.
How big is the Buddy board-MINI?
The Buddy board-MINI measures 105 × 70 mm, has 6 copper layers and is 1.6 mm thick.
How many components are on the Buddy board-MINI?
350 components, from 95 distinct parts. The full bill of materials is listed on this page.
Where can I download the Buddy board-MINI design files?
From the prusa3d/Buddy-board-MINI-PCB repository on GitHub, which has the KiCad layout; the links under Design files point to each one.
Can I use the Buddy board-MINI design in my own project?
The repository has no license, so all rights stay with prusa3d. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Buddy board-MINI without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.
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