QCB board
About the QCB board
QCB board is an open source PCB design by bartkepl, published on GitHub under the MIT license. It is a 4-layer board measuring 101.6 × 128.7 mm, with 171 components from 41 distinct parts.
Other key parts include the IP175G, FE1.1s, USBLC6-2SC6 and M24C02-WMN. By type, the board carries 73 capacitors, 52 resistors, 13 ICs, 13 diodes, 10 connectors and 6 inductors.
From the project
Quad Card Backplane
Quad Card Backplane for 3U eurocards. Splits USB 2.0 and 10/100M Ethernet (plus RS485 and an ID EEPROM) out to 4 eurocards.
- Schematic and PCB routing are done (rev 0.1), production files generated. - A full design review (schematic + PCB + EMC + SPICE) was completed on 2026-08-03 and re-checked since; see Documentation below. - Fiducials added (2 per side, hand assembly), Y2 load caps C41/C42 now included in the BOM, datasheets for IP175G, FE1.1s and UT8413A in doc/datasheet/.
Main components on the QCB board
QCB board bill of materials (BOM)
171 components, 41 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | IP175G | QFN40P600X600X90-49N-D | IC1 |
| 1 | FE1.1s | SSOP-28_3.9x9.9mm_P0.635mm | U1 |
| 7 | USBLC6-2SC6 | SOT-23-6_Handsoldering | U4, U5, U7, U9, U11, U13, U14 |
| 4 | M24C02-WMN | SOIC-8_3.9x4.9mm_P1.27mm | U6, U8, U10, U12 |
| 1 | ABM8G-12.000MHZ-18 | Crystal_SMD_Abracon_ABM8G-4Pin_3.2x2.5mm | Y1 |
| 1 | 3225-25M-SR | Crystal_SMD_3225-4Pin_3.2x2.5mm | Y2 |
| 1 | Conn_01x03_Socket | JST_PH_B3B-PH-K_1x03_P2.00mm_Vertical | J1 |
| 1 | Conn_01x04_Socket | JST_PH_B4B-PH-K_1x04_P2.00mm_Vertical | J2 |
| 1 | 100616-2 | 1006162 | J3 |
| 1 | Conn_01x04 | PinHeader_1x04_P1.00mm_Vertical | J4 |
| 1 | Conn_01x02 | PinHeader_1x02_P1.00mm_Vertical | J5 |
| 1 | 39-29-3086 | Molex_Mini-Fit_Jr_5566-08A_2x04_P4.20mm_Vertical | J6 |
| 4 | DIN41612_02x32_AC | DIN41612_C_2x32_Female_Vertical_THT | J7, J8, J9, J10 |
| 1 | 0ZCJ0150F2C Polyfuse | Fuse_1206_3216Metric_Pad1.42x1.75mm_HandSolder | F1 |
| 1 | H1102NL | SOIC127P940X597-16N | T1 |
| 8 | N0G69S04 ~ | LED_0603_1608Metric | D1, D2, D3, D4, D5, D6, D7, D8 |
| 1 | ESD5Z3.3T1G | D_SOD-523 | D10 |
| 4 | UT8413A | Diodes_UDFN-10_1x2.5mm_P0.5mm | D12, D13, D14, D15 |
| 5 | WLBD1608HCU101TL 100 @ 100MHz | L_0603_1608Metric_Pad1.05x0.95mm_HandSolder | FB1, FB2, FB3, FB4, FB5 |
| 1 | LQH32PN101MN0L | L_1210_3225Metric | L1 |
Show 21 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 3 | 1206B102K202 1nF/2kV | C_1206_3216Metric | C1, C15, C43 |
| 30 | GRM188R71H104KA93D 100n | C_0603_1608Metric | C2, C9, C11, C12, C13, C14, C18, C19 +22 |
| 13 | CL31B106KBHNNNE 10u | C_1206_3216Metric | C3, C4, C5, C8, C17, C21, C29, C46 +5 |
| 4 | CL10B105KA8NNNC 1u | C_0603_1608Metric | C7, C16, C20, C28 |
| 1 | 1n | C_0603_1608Metric | C34 |
| 2 | 6.8n | C_0603_1608Metric | C37, C38 |
| 2 | GRM1885C1H103JA01J 10n | C_0603_1608Metric | C39, C40 |
| 2 | 18p | C_0402_1005Metric | C41, C42 |
| 16 | CGA4J3X7T2E104KAA 100n | C_0805_2012Metric | C57, C58, C61, C62, C64, C65, C68, C69 +8 |
| 1 | 0R | R_0603_1608Metric | R1 |
| 2 | 100k | R_0603_1608Metric | R3, R6 |
| 9 | 330 | R_0603_1608Metric | R4, R5, R10, R21, R24, R25, R26, R27 +1 |
| 1 | 2.7k | R_0603_1608Metric | R9 |
| 8 | CRCW060349R9FKTABC 49.9 | R_0603_1608Metric | R11, R12, R13, R14, R15, R16, R41, R42 |
| 20 | 2.2 | R_0603_1608Metric | R17, R18, R19, R20, R28, R29, R31, R32 +12 |
| 1 | 6.19k | R_0603_1608Metric | R33 |
| 3 | 10k | R_0603_1608Metric | R34, R35, R36 |
| 1 | 10 | R_0603_1608Metric | R43 |
| 2 | RC0603JR-0782RL 82 | R_0603_1608Metric | R45, R46 |
| 2 | 0603SAJ0750T5E 75 | R_0603_1608Metric | R55, R56 |
| 2 | 1-2176339-5 150 | R_0603_1608Metric | R57, R58 |
QCB board design files
The KiCad project lives in the bartkepl/QCB_board repository on GitHub; these links point at the commit this page was built from.
- Layoutpcb/QCB_board.kicad_pcb
- Schematicpcb/QCB_board.kicad_sch
QCB board: common questions
How big is the QCB board?
The QCB board measures 101.6 × 128.7 mm, has 4 copper layers and is 1.5862 mm thick.
How many components are on the QCB board?
171 components, from 41 distinct parts. The full bill of materials is listed on this page.
Where can I download the QCB board design files?
From the bartkepl/QCB_board repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the QCB board design in my own project?
Yes, under the terms of its MIT license, which bartkepl chose for the repository.