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4 layers100 × 50.5 mmUBITz Dock Power Impl, the printed circuit board in 3D

UBITz Dock Power Impl

dumaiss/uBITz

**μBITz** – *ZAP 80s dreams into silicon.* Open modular 8-bit system: dock Z80/6502, tile SID/POKEY, boot in '83. M.2 LVDS serial, I²C map, Parity-10, ZAP IRQs. Spec + KiCad + Verilog + ref impl. Build. ZAP. Retro lives. `ubitz.dev` #μBITz

Full screenGitHub.kicad_pcb
Size
100 × 50.5 mm
Copper layers
4
Thickness
1.6 mm
Parts
92
Nets
65
Pads
346
Tracks, vias
114, 24
Pours
2
Routed
Yes
KiCad
KiCad 9.0 (file 20241229)
Created
31 Oct 2025
Updated
9 Jan 2026

Overview

UBITz Dock Power Impl is an open-source printed circuit board by dumaiss, from the dumaiss/uBITz repository on GitHub. It is a 4-layer board of 100 × 50.5 mm with 92 parts on 65 nets, routed with 114 tracks and 24 vias.

It is built around the STEF4SPUR, TPS2121RUXR and USBLC6-2SC6, with the STL6P3LLH6, 1206L050YR and BAT54TW-TP among its other parts. Its parts include 33 capacitors, 29 resistors, 9 ICs, 7 diodes and 3 connectors. It belongs with the retro computing and games and computers and single-board computers boards of this library.

Main components

10

README

README.md

uBITz

μBITz – ZAP 80s dreams into silicon.

Open modular 8-bit style system: host Z80/6502/68k/RISC-V, tile SID/POKEY, boot in '83. M.2 LVDS serial, I²C map, Parity-10, ZAP IRQs. Spec + KiCad + Verilog + ref impl. Build. ZAP. Retro lives. ubitz.dev #μBITz

Parts

92
QtyValueFootprintReferences
7100kResistor_SMD:R_0603_1608MetricR1, R12, R13, R19, R22, R26, R27
7100nCapacitor_SMD:C_0603_1608MetricC1, C7, C10, C16, C19, C26, C29
622uCapacitor_SMD:C_0603_1608MetricC13, C14, C22, C23, C32, C33
64u7Capacitor_SMD:C_0603_1608MetricC8, C9, C17, C18, C27, C28
51kResistor_SMD:R_0603_1608MetricR4, R10, R11, R17, R25
41uCapacitor_SMD:C_0603_1608MetricC4, C5, C6, C25
447uCapacitor_SMD:C_0603_1608MetricC11, C12, C20, C21
44k7Resistor_SMD:R_0603_1608MetricR6, R7, R8, R9
333pCapacitor_SMD:C_0603_1608MetricC15, C24, C34
3LEDLED_SMD:LED_0603_1608MetricD4, D5, D7
3LMR51450SDRRRFootprints:CONV_LMR51450SDRRRU4, U7, U9
3STEF4SPURFootprints:DFN_4SPUR_STM-LU3, U5, U8
210kResistor_SMD:R_0603_1608MetricR24, R29
231k6Resistor_SMD:R_0603_1608MetricR14, R23
233uCapacitor_SMD:C_0603_1608MetricC30, C31
23u3Inductor_SMD:L_Bourns_SRP7028A_7.3x6.6mmL1, L2
25kResistor_SMD:R_0603_1608MetricR16, R20
2MountingHoleMountingHole:MountingHole_2.5mmH1, H2
2STL6P3LLH6Footprints:TRANS_STL6P3LLH6Q1, Q2
1100Resistor_SMD:R_0603_1608MetricR2
11206L050YRFuse:Fuse_1206_3216MetricF2
118kResistor_SMD:R_0603_1608MetricR18
119k1Resistor_SMD:R_0603_1608MetricR28
11uCapacitor_SMD:C_0402_1005MetricC2
120kResistor_SMD:R_0603_1608MetricR30
12171750001Footprints:2171750001_MOLJ1
122kResistor_SMD:R_0603_1608MetricR5
124kDiode_SMD:D_0603_1608MetricR21
14u7Inductor_SMD:L_Bourns_SRP7028A_7.3x6.6mmL3
191kResistor_SMD:R_0603_1608MetricR15
1BAT54TW-TPFootprints:SOP65P222X120-6ND6
1Conn_02x10_Counter_ClockwiseConnector_PinHeader_2.54mm:PinHeader_2x10_P2.54mm_VerticalJ3
1D_SchottkyDiode_SMD:D_SOD-323_HandSolderingD2
1ESDA25SC6Footprints:SOT23-6L_STMCR1
1SMBJ24ADiode_SMD:D_SMA_HandsolderingD1
1SMBJ5.0ADiode_SMD:D_SMB_HandsolderingD3
1SMDC300F/24-2Fuse:Fuse_2920_7451Metric_Pad2.10x5.45mm_HandSolderF1
1STUSB4500QTRFootprints:QFN50P400X400X90-25NU1
1SW_DPSTConnector_Molex:Molex_KK-254_AE-6410-04A_1x04_P2.54mm_VerticalSW1
1TPS2121RUXRFootprints:IC_TPS2121RUXRU6
1USBLC6-2SC6Package_TO_SOT_SMD:SOT-23-6U2
1USB_AConnector_USB:USB_A_Molex_67643_HorizontalJ2

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Questions

How big is the UBITz Dock Power Impl PCB?

It measures 100 × 50.5 mm and has 4 copper layers, 1.6 mm thick.

What parts does the UBITz Dock Power Impl use?

92 parts, built around the STEF4SPUR, TPS2121RUXR, USBLC6-2SC6 and STL6P3LLH6. 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 UBITz Dock Power Impl KiCad files?

From the dumaiss/uBITz repository on GitHub, at the commit this page was made from: the board is uBITz Platform Code/Dock/Schem/uBITz-Dock-Reference-Impl/04-Power-Module/uBITz-Dock-Power-Impl.kicad_pcb and its schematic uBITz Platform Code/Bank/Schem/uBITz-Bank-Reference-Impl/03-Z80-Based-Host/uBITz-Host-z80-Host/uBITz-Host-z80-Host.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the UBITz Dock Power Impl design in my own project?

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