Switch engine
About the Switch engine PCB
Switch engine is an open source STM32 PCB design by azonenberg, published on GitHub under the BSD-3-Clause license. It is a 10-layer board measuring 151 × 111 mm, with 362 components from 80 distinct parts.
Its main chip is the STM32L431-QFN48, from the STM32 family. Other key parts include the MYMGK1R812ERSR, MYMGK00506ERSR, MYMGK00504ERSR, ADP1740ACPZ-1.8-R7 and XCKU5P-2FFVB676I. By type, the board carries 159 capacitors, 93 resistors, 29 test points, 28 ICs, 25 connectors and 14 diodes.
From the project
Open hardware 48x 1000baseT + 2x 25G SFP28 Ethernet switch
Originally located in azonenberg/latentpacket but moved out to avoid monorepo bloat.
High level architecture: IBC (x1): 48V -> 12V intermediate bus converter. Not in this repo, see https://github.com/azonenberg/common-ibc Line card (x2): 24 10/100/1000 baseT ports, driven by two VSC8512 12-port PHYs * Switch engine (x1): Kintex UltraScale+ FPGA (XCKU3P or 5P in FFVB676), STM32H735 (tentatively), packet buffer SRAM, 2x 25G SFP28 uplink
Main components on the Switch engine
Switch engine bill of materials (BOM)
362 components, 80 distinct parts.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | STM32L431-QFN48 | QFN_48_0.5MM_7x7MM | U1 |
| 2 | MYMGK1R812ERSR | MODULE_MURATA_MYMGK1R812 | U2, U3 |
| 1 | MYMGK00506ERSR | MODULE_MURATA_MYMGK00504ERSR | U4 |
| 2 | MYMGK00504ERSR | MODULE_MURATA_MYMGK00504ERSR | U5, U6 |
| 1 | ADP1740ACPZ-1.8-R7 | QFN_16_0.65MM_4x4MM | U7 |
| 1 | XCKU5P-2FFVB676I | BGA_676_27x27_FULLARRAY_1MM_FFG676 | U8 |
| 1 | STM32H735-UFBGA176-25 | BGA_201_10x10_DEPOP_0.65MM_OSHPARK | U9 |
| 7 | 74LVC1T45 | DFN_6_0.5MM_1.6x1.6MM_TI_DPK | U10, U11, U12, U18, U19, U20, U21 |
| 1 | MT25QU256ABA8E12-0AUT | BGA_24_6x8_DEPOP1_1MM | U13 |
| 2 | ECS-1612MV-250-CN | OSCILLATOR_1.6x1.2 | U14, U22 |
| 3 | SIT9121AI-2BF-XXS156.250000G | OSCILLATOR_LVDS_3.2x2.5 | U15, U25, U27 |
| 1 | AT24MAC402 | DFN_8_0.5MM_2x3MM_TALL | U17 |
| 1 | KSZ9031RN | QFN_48_0.5MM_7x7MM | U23 |
| 2 | ESD224DQAR | DFN_10_0.5MM_2.5x1MM_TI_DQA | U24, U26 |
| 1 | ADP1740ACPZ-2.5-R7 | QFN_16_0.65MM_4x4MM | U28 |
| 1 | ADM3101E_QFN | QFN_12_0.5MM_3x3MM | U29 |
| 1 | 960-27-23-D-AB-0 | HEATSINK_WAKEFIELDVETTE_960-27-12-D-AB-0 | M8 |
| 1 | FAN | FAN_DELTA_EFB0412VHD-SP05 | M9 |
| 1 | SSM6N58NU | DFN_6_0.65MM_2x2MM_GDS | Q2 |
| 1 | CONN_PCIE_PWR_8PIN | CONN_MOLEX_MINIFITJR_8POS_0039291087 | J1 |
Show 60 more
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | CONN_IBC_MGMT | CONN_MOLEX_PICOBLADE_5POS_0532610571 | J2 |
| 1 | CONN_01X03 | CONN_HEADER_2.54MM_1x3_REFLOW | J3 |
| 2 | CORTEX_DEBUG_ETM | CONN_HEADER_1.27MM_2x10_SMT_SAMTEC_FTSH-110-01-L-DV-K | J4, J10 |
| 2 | FAN_01 | CONN_MOLEX_KK_0470531000 | J5, J6 |
| 1 | JUMPER_0402 | EIA_0402_JUMPER | J7 |
| 1 | XILINX_JTAG | XILINX_JTAG_PTH_MOLEX_0878311420 | J8 |
| 2 | PMOD_HOST | CONN_HEADER_2.54MM_2x6_RA_PMOD_HOST | J9, J13 |
| 2 | SMPM | CONN_SMPM_AMPHENOL_C925-197J-51PT | J11, J24 |
| 1 | CONN_01X03 | CONN_HEADER_2.54MM_1x3 | J12 |
| 6 | ARF6-08-S-D-A-K-TR | CONN_SAMTEC_ARF6-08-S-D-A-K-TR | J14, J15, J17, J18, J21, J22 |
| 3 | CONN_01X10 | CONN_MOLEX_PICOBLADE_10POS_0532611071 | J16, J19, J23 |
| 1 | 0826-1G1T-23-F | CONN_BELFUSE_0826_1G1T_23_F | J20 |
| 1 | RJ45 | CONN_RJ45_BELSTEWART_SS-7188S-A-PG4-1-BA-xx | J26 |
| 1 | 3A | EIA_0603_CAP_NOSILK | F1 |
| 2 | SWITCH | SWITCH_RAFI_MICON_5 | SW1, SW2 |
| 5 | TESTPOINT | TESTPOINT_SMT_0.5MM | TP1, TP2, TP3, TP4, TP5 |
| 1 | CONN_01X03 | CONN_HEADER_2.54MM_1x3_REFLOW | TP6 |
| 2 | TESTCLIP | TESTPOINT_SMT_KEYSTONE_5016 | TP7, TP29 |
| 16 | U.FL | CONN_U.FL_TE_1909763-1 | TP8, TP9, TP10, TP11, TP12, TP13, TP14, TP15 +8 |
| 5 | CONN_01X03 | CONN_HEADER_2.54MM_1x3 | TP16, TP25, TP26, TP27, TP28 |
| 9 | GREEN | EIA_0402_LED | D1, D7, D8, D9, D10, D11, D12, D13 +1 |
| 1 | RED | EIA_0402_LED | D2 |
| 4 | SZESD7471N2T5G | SOD882 | D3, D4, D5, D6 |
| 1 | BLM31KN271SH1L | EIA_1206_CAP_NOSILK | FB1 |
| 6 | MI0603J601R-10 | EIA_0603_INDUCTOR_NOSILK | FB2, FB3, FB4, FB5, FB6, FB7 |
| 1 | 2.2 uH | EIA_1210_CAP_NOSILK | L1 |
| 10 | 22 uF 25V | EIA_1812_CAP_NOSILK | C1, C2, C3, C4, C12, C13, C14, C15 +2 |
| 1 | 25SVPF330M | CAP_AL_10MM_SMT | C5 |
| 10 | 220 uF | EIA_1210_CAP_NOSILK | C6, C7, C8, C9, C10, C11, C25, C26 +2 |
| 47 | 0.47 uF | EIA_0402_CAP_NOSILK | C18, C21, C22, C23, C27, C64, C65, C66 +39 |
| 28 | 4.7 uF | EIA_0603_CAP_NOSILK | C19, C36, C37, C58, C59, C60, C61, C62 +20 |
| 17 | 0.1 uF | EIA_0402_CAP_NOSILK | C20, C96, C97, C117, C118, C119, C120, C141 +9 |
| 9 | 100 uF | EIA_1210_CAP_NOSILK | C24, C28, C31, C34, C49, C52, C53, C54 +1 |
| 2 | DNP | EIA_1210_CAP_NOSILK | C32, C33 |
| 2 | DNP | EIA_0402_CAP_NOSILK | C35, C146 |
| 2 | 10 uF 25V | EIA_1210_CAP_NOSILK | C38, C39 |
| 1 | 330 uF | EIA_1210_CAP_NOSILK | C40 |
| 5 | 47 uF | EIA_1210_CAP_NOSILK | C41, C42, C43, C44, C56 |
| 13 | 10 uF | EIA_0805_CAP_NOSILK | C45, C46, C47, C48, C50, C51, C57, C74 +5 |
| 10 | 0.47 uF | EIA_0201_CAP_NOSILK | C77, C82, C83, C84, C86, C89, C90, C92 +2 |
| 1 | 22 uF | EIA_0805_CAP_NOSILK | C85 |
| 1 | 220 pF | EIA_0402_CAP_NOSILK | C100 |
| 10 | 33K | EIA_0402_RES_NOSILK | R1, R14, R58, R59, R60, R61, R62, R63 +2 |
| 1 | 8.06K | EIA_0402_RES_NOSILK | R2 |
| 21 | 10K | EIA_0402_RES_NOSILK | R3, R4, R6, R10, R13, R23, R31, R33 +13 |
| 1 | 24.9k | EIA_0402_RES_NOSILK | R5 |
| 1 | 1.2k | EIA_0402_RES_NOSILK | R7 |
| 1 | 620 | EIA_0402_RES_NOSILK | R8 |
| 5 | 0 | EIA_0402_RES_NOSILK | R9, R11, R12, R22, R71 |
| 11 | 4.7K | EIA_0402_RES_NOSILK | R15, R18, R39, R40, R41, R42, R54, R55 +3 |
| 3 | DNP | EIA_0402_RES_NOSILK | R16, R25, R28 |
| 1 | 2.2k | EIA_0402_RES_NOSILK | R17 |
| 1 | 20k | EIA_0402_RES_NOSILK | R19 |
| 1 | 22 | EIA_0402_RES_NOSILK | R20 |
| 1 | 300 | EIA_0402_RES_NOSILK | R21 |
| 11 | 1K | EIA_0402_RES_NOSILK | R24, R26, R27, R29, R30, R32, R35, R37 +3 |
| 20 | 33 | EIA_0402_RES_NOSILK | R43, R44, R45, R46, R47, R48, R49, R50 +12 |
| 2 | 470 | EIA_0402_RES_NOSILK | R68, R69 |
| 1 | 12.1K 1% | EIA_0402_RES_NOSILK | R82 |
| 1 | 100 | EIA_0402_RES_NOSILK | R85 |
Switch engine design files
The KiCad project lives in the azonenberg/latentred repository on GitHub; these links point at the commit this page was built from.
Switch engine: common questions
What microcontroller does the Switch engine use?
The Switch engine is built around the STM32L431-QFN48, from the STM32 family.
How big is the Switch engine PCB?
The Switch engine measures 151 × 111 mm, has 10 copper layers and is 1.599994 mm thick.
How many components are on the Switch engine?
362 components, from 80 distinct parts. The full bill of materials is listed on this page.
Where can I download the Switch engine design files?
From the azonenberg/latentred repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.
Can I use the Switch engine design in my own project?
Yes, under the terms of its BSD-3-Clause license, which azonenberg chose for the repository.
Can I test firmware for the Switch engine 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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