4 layers52.5 × 60 mm SDBox, the printed circuit board in 3D

SDBox

A parallel to Pico 2 W and sd-card project for the Amiga

Size: 52.5 × 60 mm
Copper layers: 4
Thickness: 1.6 mm
Parts: 23
Nets: 63
Pads: 186
Tracks, vias: 520, 102
Pours: 7
Routed: Yes
KiCad: KiCad 5 (file 20171130)
Created: 12 May 2025
Updated: 10 Feb 2026

Overview

SDBox is an open-source printed circuit board by jbilander, from the jbilander/SDBox-v3 repository on GitHub, published under the GPL-3.0 licence. It is a 4-layer board of 52.5 × 60 mm with 23 parts on 63 nets, routed with 520 tracks and 102 vias.

It is built around the SN74CBT16210DL. Its parts include 4 resistors, 3 capacitors, 3 diodes, 3 connectors and 2 ICs. It belongs with the retro computing and games boards and the RP2350 boards of this library.

Main components

SN74CBT16210DL
SSOP-48-300mil-40℃~+85℃ 20 250ps 4V~5.5V 5Ω SSOP-48-300mil Analog Switches, Multiplexers ROHSTexas InstrumentsAnalog Switches, Multiplexers

README

README.md

SDBox-v3

A parallel to Pico 2 W and sd-card project for the Amiga

Firmware for this project with support for a blinking activity LED can be built from source here:
https://github.com/jbilander/amiga-par-to-spi-adapter/tree/master/rp2350

BOM Rev. 3C

same as 3B but with these changes:

Reference	Name/Value	Package	Notes
BT1	Push button	Sunrom_Tactile_Switch_3x4x2mm_SMD_2-Pin	Aliexpress
D1-D2 (Optional)	SMD LED	0603	Aliexpress
R1 (Optional)	1k Ω	0805	(Mandatory if D1 populated) Series resistor for D1 LED, adjust R-value to your type of LED and preferred brightness
R2 (Optional)	1k Ω	0805	(Mandatory if D2 populated) Series resistor for D2 LED, adjust R-value to your type of LED and preferred brightness

BOM Rev. 3B

Reference	Name/Value	Package	Notes
U1	Raspberry Pi Pico 2 W	SC1633 (without header)	RPi Pico 2 W
U2	SN74CBT16210	TSSOP-48 6.1x12.5mm_P0.5mm	20-BIT FET Bus switch with level shifting, high-speed TTL-compatible. SN74CBT16210CDGGR
J1	DB25_Male	DSUB-25_Male_EdgeMount_P2.77mm	DB25 Male Aliexpress
J2	Sunrom Micro SD Card Holder	9-pin Micro SD card slot connector	Sunrom Micro-SD Aliexpress
J3	(Optional) UART0 PinHeader	5-pin 2.54 mm pitch single row	Optional 5V-tolerant header for UART0 (TX on GP12, RX on GP13)
JP1	(Optional) PinHeader/Jumper shunt	2-pin 2.54 mm pitch single row	Jumper on connects Amiga /RESET signal together with RUN-pin (pin 30) on Pico 2 W, resets pico on Ctrl-A-A
D1 (Optional)	LED Square 2x5x7mm	PinHeader_1x02_P2.54mm_Vertical, pin pitch 2.54 mm	Power LED indicator Aliexpress
D2 (Optional)	LED Square 2x5x7mm	PinHeader_1x02_P2.54mm_Vertical, pin pitch 2.54 mm	Activity LED indicator Aliexpress
D3	MMDL6050T1G Small Signal Switching Diode 200mA	SOD-323	MMDL6050T1G
R1 (Optional)	4.7k Ω	0805	(Mandatory if D1 populated) Series resistor for D1 LED, adjust R-value to your type of LED and preferred brightness
R2 (Optional)	220 Ω	0805	(Mandatory if D2 populated) Series resistor for D2 LED, adjust R-value to your type of LED and preferred brightness
R3 (Optional)	10k Ω	0603	Pull-up for /STROBE signal, not currently used
R4	2.9k - 3k Ω	0603	Resistor for dummy loading D3 to achieve steady 0.6-0.7V VCC drop resulting in ~4.3V power supply to U2 CR0603-FX-2941ELF
RN1, RN2	CAY16-103J4LF RES ARRAY 4 Resistors 10k Ω	1206	CAY16-103J4LF
RN3	A103J	Bussed Resistor Network Array SIP-9	Pull-up resistors for data lines, 9PIN-10K Aliexpress
C1	Capacitor 10uF	1206
C2	Capacitor 0.1uF = 100nF	0805
C3	Capacitor 0.1uF = 100nF	0603
Housing	2 x Plastic Shell Cover	For DB25 plug	Aliexpress
2 x PinHeader	PinHeader Board Weight/Level Support	3-pin 2.54 mm pitch single row	Move the plastic guard to leave ~7.5 mm of pin before soldering in order to hold board in perfect level

When ordering from JLCPCB select:

Specify Layer Sequence: Yes

text

L1(Top layer):    F_Cu.gbr
L2(Inner layer1): GND_Cu.gbr
L3(Inner layer2): VCC_Cu.gbr
L4(Bottom layer): B_Cu.gbr

Remove Order Number:

text

Specify a location

This will notify JLC where to put the order number, they will replace the "JLCJLCJLCJLC" silkscreen label.

Parts

Qty	Value	Footprint	References
2	10k_R_Pack04	SDBox:RESCAF80P320X160X60-8N	RN1, RN2
2	1k	Resistor_SMD:R_0805_2012Metric_Pad1.15x1.40mm_HandSolder	R1, R2
1	0.1uF	Capacitor_SMD:C_0805_2012Metric_Pad1.15x1.40mm_HandSolder	C2
1	0.1uF	Capacitor_SMD:C_0603_1608Metric_Pad1.08x0.95mm_HandSolder	C3
1	10k	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R3
1	10k	Resistor_THT:R_Array_SIP9	RN3
1	10uF	Capacitor_SMD:C_1206_3216Metric_Pad1.33x1.80mm_HandSolder	C1
1	2.9k	Resistor_SMD:R_0603_1608Metric_Pad0.98x0.95mm_HandSolder	R4
1	Activity LED indicator	Diode_SMD:D_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D2
1	Conn_01x05	SDBox:UART_PinHeader_SMD_pads_2.54mm_pitch	J3
1	DB25_Male	Connector_Dsub:DSUB-25_Male_EdgeMount_P2.77mm	J1
1	MMDL6050T1G	Diode_SMD:D_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D3
1	Micro_SD_Card_Socket	SDBox:GCT-MEM2055-00-190-01-A	J2
1	Power LED indicator	Diode_SMD:D_0603_1608Metric_Pad1.05x0.95mm_HandSolder	D1
1	Rapberry_Pi_Pico_2W	SDBox:RPi_Pico_SMD	U1
1	SN74CBT16210	Package_SO:TSSOP-48_6.1x12.5mm_P0.5mm	U2
1	SW_Push	SDBox:Sunrom_Tactile_Switch_3x4x2mm_SMD_2-Pin	BT1

The 19 most common of 23 parts.

Questions

How big is the SDBox PCB?

It measures 52.5 × 60 mm and has 4 copper layers, 1.6 mm thick.

What parts does the SDBox use?

23 parts, built around the SN74CBT16210DL. 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 SDBox KiCad files?

From the jbilander/SDBox-v3 repository on GitHub, at the commit this page was made from: the board is KiCad/SDBox.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.

Can I use the SDBox design in my own project?

Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).

Category and platform

Retro computing and games RP2350

Project files

Show this board on your page

A live frame, for any web page

<iframe src="https://pcbkit.io/embed/boards/jbilander-sdbox-v3" title="SDBox in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe>

A picture

<img src="https://pcbkit.io/embed/boards/jbilander-sdbox-v3.jpg" alt="SDBox" width="1200" height="900">

A picture that opens the board, for a README

[![SDBox](https://pcbkit.io/embed/boards/jbilander-sdbox-v3.jpg?size=s)](https://pcbkit.io/boards/jbilander-sdbox-v3)

Source

Repository: jbilander/SDBox-v3
Board file: KiCad/SDBox.kicad_pcb
Commit: b2b7a8a
Licence: GPL-3.0

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