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4 layers66.7 × 39 mmPower, the printed circuit board in 3D

Power

KRuskowski/s5

einheit s5 (S501) — 5-port managed PoE switch on Allwinner T113-S3

Open in PCBKitView on GitHub.kicad_pcb
Size
66.7 × 39 mm
Copper layers
4
Thickness
1.6 mm
Parts
62
Nets
34
Pads
208
Tracks, vias
239, 75
Pours
1
Routed
Yes
KiCad
KiCad 10.0 (file 20260206)
Created
30 Jun 2026
Updated
26 Jul 2026

Overview

Power is an open-source printed circuit board by KRuskowski, from the KRuskowski/s5 repository on GitHub. It is a 4-layer board of 66.7 × 39 mm with 62 parts on 34 nets, routed with 239 tracks and 75 vias.

It is built around the LM5122MH, TPS54560DDA and AMS1117-3.3, with the BSC057N08NS3G, BZX84C12 and PMEG10010ELR-QX among its other parts. Its parts include 21 capacitors, 18 resistors, 4 diodes, 3 ICs and 3 transistors.

Main components

8

README

hw/core/README.md

s5 Hardware — 5-Port Managed Switch Board

KiCad + SKiDL hardware for the s5 (S501) switch.

Generating the netlist

sh
export KICAD_SYMBOL_DIR=/usr/share/kicad/symbols
export KICAD8_SYMBOL_DIR=/usr/share/kicad/symbols
python netlistscript          # writes netlist_s5.net

Import the result into KiCad: File -> Import -> Netlist.

What's on the board

BlockPartNotes
Management SoCAllwinner T113-S3 (eLQFP128, SiP 128MB DDR3)No external DRAM routing. Real pin numbers from datasheet v1.6 (see T113S3_PINMAP.md).
Switch ASICKSZ9477S (128-TQFP)5 copper GbE PHY ports + RGMII CPU port (port 6). Mainline DSA (microchip,ksz9477).
CPU-port linkT113 EMAC (RGMII, PG bank) -> KSZ port 6MAC-to-MAC, no magnetics, frees all 5 copper ports for users.
5x GbE portsDiscrete GbE magnetics (YDS 30F-51NL) + plain RJ45Full 1000BASE-T (4 pairs/port).
PoE PSE2x TPS23861 (4ch each), all 5 ports48V DC in, N-FET + sense per port.
Power input48V DC -> TPS54560 buck (5V)LDO chain: 3.3/2.5/1.2V (KSZ) + 0.9V buck (T113 core) + 1.8V LDO (DRAM).
Boot flashW25Q128 SPI NOR (SOIC-8)Shared SPI0 bus; flash CS on PC3, KSZ CS via GPIO.
WatchdogTPS3823-33 (SOT-23-5)RST -> T113 RESET, WDI from T113 GPIO.
Console3-pin UART headerT113 UART0 (PE2/PE3).
USBUSB-C (GCT USB4110)Device mode for debug/FEL.
Stackup4-layerNo external DDR3 = no high-speed signal layer needed.

Key design files

FileDescription
netlistscriptSKiDL connection script (the source of truth)
netlist_s5.netGenerated netlist (0 errors)
T113S3_PINMAP.mdT113-S3 pin map extracted from datasheet v1.6

Open TODOs (marked in-script)

  1. T113 eLQFP128 exposed pad -> GND is mandatory (only one dedicated GND pin: AGND=91). Add EP in the footprint.
  2. RGMII CLKIN 25MHz reference source (KSZ SYNCLKO or crystal).
  3. Unused analog rails (VCC-LVDS/HPVCC/TVOUT/TVIN) — confirm per datasheet §5.3 whether they may be left unpowered.
  4. AVCC filtering (ferrite bead recommended per datasheet).
  5. T113 package footprint (eLQFP128_14x14x1.4mm) — confirm or create.

Parts

62
QtyValueFootprintReferences
4100kResistor_SMD:R_0402_1005MetricR1, R2, R13, R15
4MountingHole_M3_PEMountingHole:MountingHole_3mm_PadMH1, MH2, MH3, MH4
3100nFCapacitor_SMD:C_0402_1005MetricC6, C9, C15
310kResistor_SMD:R_0402_1005MetricR6, R7, R18
310uF/100VCapacitor_SMD:C_1210_3225MetricC10, C11, C12
2100RResistor_SMD:R_0402_1005MetricR9, R10
210uFCapacitor_SMD:C_1210_3225MetricC1, C2
22.2RResistor_SMD:R_0402_1005MetricR11, R12
22.2uFCapacitor_SMD:C_1206_3216MetricC17, C18
222uFCapacitor_SMD:C_0805_2012MetricC19, C20
222uF/63VCapacitor_SMD:C_1206_3216MetricC13, C14
2BSC057N08NS3GPackage_SO:PowerPAK_SO-8_SingleQ2, Q3
1100pFCapacitor_SMD:C_0402_1005MetricC8
1100uFCapacitor_SMD:C_1206_3216MetricC3
110nFCapacitor_SMD:C_0402_1005MetricC7
110uFCapacitor_SMD:C_0805_2012MetricC21
113kResistor_SMD:R_0402_1005MetricR14
115nFCapacitor_SMD:C_0402_1005MetricC16
11uFCapacitor_SMD:C_0603_1608MetricC4
12.2uH XAL1010-222MED Isat34A DCR2.8mR (LCSC C5125746)Inductor_SMD:L_Coilcraft_XAL1010-XXXFB1
122uHInductor_SMD:L_Bourns_SRP1245AL1
124.9kResistor_SMD:R_0402_1005MetricR16
133uHInductor_SMD:L_Coilcraft_XAL1510-333L2
14.7uFCapacitor_SMD:C_0805_2012MetricC5
140.2kResistor_SMD:R_0402_1005MetricR8
1440kResistor_SMD:R_0402_1005MetricR5
145.3kResistor_SMD:R_0402_1005MetricR4
152.3kResistor_SMD:R_0402_1005MetricR17
16.8kResistor_SMD:R_0402_1005MetricR3
1AMS1117-3.3Package_TO_SOT_SMD:SOT-223-3_TabPin2U3
1BZX84C12Package_TO_SOT_SMD:SOT-23D2
1Fuse_12A_TL_0452012Fuse:Fuse_Littelfuse-NANO2-451_453F1
1LM5122Package_SO:HTSSOP-20-1EP_4.4x6.5mm_P0.65mm_EP3.4x6.5mm_ThermalViasU1
1MOV_S14K30_DNPVaristor:RV_Disc_D9mm_W3.9mm_P5mmRV1
1MSTB2,5/3-GF-5,08_1776511Connector_Phoenix_MSTB:PhoenixContact_MSTB_2,5_3-GF-5,08_1x03_P5.08mm_Horizontal_ThreadedFlangeJ1
1PMEG10010ELR-QXDiode_SMD:D_SOD-123FD4
1PowerCable_8waypower:PowerCable_8way_SolderFieldJ2
1R_5m_2WResistor_SMD:R_2512_6332MetricRS
1SMBJ33ADiode_SMD:D_SMBD1
1SQJ409EP P-ch 40V 7mR (LCSC C727776)Package_SO:PowerPAK_SO-8L_SingleQ1
1SS56Diode_SMD:D_SMCD3
1TPS54560Package_SO:SOIC-8-1EP_3.9x4.9mm_P1.27mm_EP2.29x3mmU2

The 61 most common of 62 parts.

Questions

How big is the Power PCB?

It measures 66.7 × 39 mm and has 4 copper layers, 1.6 mm thick.

What parts does the Power use?

62 parts, built around the LM5122MH, TPS54560DDA, AMS1117-3.3 and BSC057N08NS3G. 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 Power KiCad files?

From the KRuskowski/s5 repository on GitHub, at the commit this page was made from: the board is hw/power/power.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the Power design in my own project?

Its repository states no licence, so its author keeps all rights: ask KRuskowski before reusing the design.

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