2 layers49.3 × 103.7 mm
4 layers70 × 47.5 mm
QSFP Breakout
mwrnd/QSFP_Breakout6QSFP Breakout to U.FL/UMCC
- Size
- 70 × 47.5 mm
- Copper layers
- 4
- Thickness
- 1.61 mm
- Parts
- 54
- Nets
- 46
- Pads
- 213
- Tracks, vias
- 1,277, 255
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 11 Jun 2023
- Updated
- 6 Jul 2026
Overview
QSFP Breakout is an open-source printed circuit board by mwrnd, from the mwrnd/QSFP_Breakout repository on GitHub, published under the BSD-2-Clause licence. It is a 4-layer board of 70 × 47.5 mm with 54 parts on 46 nets, routed with 1,277 tracks and 255 vias.
It is built around the TPS562201DDC and PCA9554AD. Its parts include 19 connectors, 17 capacitors, 10 resistors, 4 inductors and 3 ICs. It belongs with the interfaces and adapters boards of this library.
Main components
2
TPS562201DDC
TSOT-23-6-40℃~+125℃@(TJ) 1 2A 380uA 4.5V~17V 580kHz 768mV~7V Adjustable Buck Built-in Overcurrent Protection、Light load efficient mode、Cycle-by-cycle current limiting、Hiccup current limiting Step-down type Yes TSOT-23-6 DC-DC Converters ROHSTexas InstrumentsDC-DC Converters
PCA9554AD
SO-16-300mil-40℃~+85℃ 10mA 2.3V~5.5V 24mA 250nA 400kHz 4V 500mV 8 8 I2C、SMBus Interrupt Output Reset function、Cascading and address extension SO-16-300mil I/O Expanders ROHSNXP SemiconductorsI/O Expanders
README
README.mdWork-In-Progress: Design not yet fully tested.
QSFP Breakout
QSFP to U.FL/UMCC Connector breakout.
Additional I2C circuitry is due to this being a stepping stone project for an OpenCAPI to dual QSFP design. OpenCAPI has only a single I2C interface.
Schematic
PCB Layout
All differential signals are length-matched to within 1mm of a 25mm total length, both inter-pair and intra-pair.
A second revision will be needed as the QSFP Cage Mounting pads are incorrect.
PCB Layer Stackup
4-Layer PCB stackup taken from JLCPCB.
100-ohm Differential Impedance parameters were calculated using the DigiKey Online Calculator.
Parts
54| Qty | Value | Footprint | References |
|---|---|---|---|
| 8 | 0u1 | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C10, C11, C12, C13, C14, C15, C16, C17 |
| 6 | 22u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C1, C2, C3, C4, C5, C6 |
| 3 | 10k | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R2, R3, R4 |
| 3 | 1uH | Inductor_SMD:L_0805_2012Metric_Pad1.15x1.40mm_HandSolder | L2, L3, L4 |
| 3 | 500 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R5, R6, R7 |
| 2 | 10u | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C7, C8 |
| 2 | 4k7 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R8, R9 |
| 1 | 33k2 | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R1 |
| 1 | 3u3 | Inductor_SMD:L_Bourns-SRN8040_8x8.15mm | L1 |
| 1 | Control | Connector_PinSocket_2.54mm:PinSocket_2x05_P2.54mm_Vertical | J2 |
| 1 | DNP | Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder | R10 |
| 1 | DNP | Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder | C9 |
| 1 | IO_EXP | Connector_PinSocket_2.54mm:PinSocket_2x05_P2.54mm_Vertical | J3 |
| 1 | PCA9554A | Package_SO:TSSOP-16_4.4x5mm_P0.65mm | U3 |
| 1 | PCIe_6Pin | ATX_Power:ATX_PCIe_6-Pin_Power_Board-Edge | J1 |
| 1 | POWERED | Diode_SMD:D_0603_1608Metric_Pad1.05x0.95mm_HandSolder | D1 |
| 1 | QSFP_Conn | QSFP:QSFP_Conn_w_Cage | U1 |
| 1 | RX1_N | U.FL_w_Label:U.FL_Hirose_w_Label | J19 |
| 1 | RX1_P | U.FL_w_Label:U.FL_Hirose_w_Label | J4 |
| 1 | RX2_N | U.FL_w_Label:U.FL_Hirose_w_Label | J5 |
| 1 | RX2_P | U.FL_w_Label:U.FL_Hirose_w_Label | J6 |
| 1 | RX3_N | U.FL_w_Label:U.FL_Hirose_w_Label | J7 |
| 1 | RX3_P | U.FL_w_Label:U.FL_Hirose_w_Label | J8 |
| 1 | RX4_N | U.FL_w_Label:U.FL_Hirose_w_Label | J9 |
| 1 | RX4_P | U.FL_w_Label:U.FL_Hirose_w_Label | J10 |
| 1 | TPS562201 | Package_TO_SOT_SMD:SOT-23-6 | U2 |
| 1 | TX1_N | U.FL_w_Label:U.FL_Hirose_w_Label | J11 |
| 1 | TX1_P | U.FL_w_Label:U.FL_Hirose_w_Label | J12 |
| 1 | TX2_N | U.FL_w_Label:U.FL_Hirose_w_Label | J13 |
| 1 | TX2_P | U.FL_w_Label:U.FL_Hirose_w_Label | J14 |
| 1 | TX3_N | U.FL_w_Label:U.FL_Hirose_w_Label | J15 |
| 1 | TX3_P | U.FL_w_Label:U.FL_Hirose_w_Label | J16 |
| 1 | TX4_N | U.FL_w_Label:U.FL_Hirose_w_Label | J17 |
| 1 | TX4_P | U.FL_w_Label:U.FL_Hirose_w_Label | J18 |
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Questions
How big is the QSFP Breakout PCB?
It measures 70 × 47.5 mm and has 4 copper layers, 1.61 mm thick.
What parts does the QSFP Breakout use?
54 parts, built around the TPS562201DDC and PCA9554AD. 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 QSFP Breakout KiCad files?
From the mwrnd/QSFP_Breakout repository on GitHub, at the commit this page was made from: the board is QSFP_Breakout.kicad_pcb and its schematic QSFP_Breakout.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the QSFP Breakout design in my own project?
Its repository publishes it under the BSD-2-Clause licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).