Tomtho slim
About the Tomtho slim PCB
Tomtho slim is an open source Nordic nRF PCB design by lou12de39r, published on GitHub. It is a 2-layer board measuring 262 × 93.5 mm, with 130 components from 19 distinct parts.
Its main chip is the MDBT50Q-1MV2, from the Nordic nRF family. Other key parts include the USBLC6-2SC6 and MCP73831T-2ACI/OT. By type, the board carries 56 switches, 55 diodes, 7 capacitors, 5 resistors, 3 ICs and 2 connectors.
It belongs with the power & battery designs in this gallery.
From the project
tomtho 配列（54キー）を ClickBoard 方式の薄型・無線キーボードにした KiCad プロジェクトです。
tomtho 配列（54キー）を ClickBoard 方式の薄型・無線キーボードにした KiCad プロジェクトです。
1. tomthoslim.kicadpro を開く（KiCad 8形式で保存してあるので、初回保存時に新形式へ変換されます） 2. PCB エディタで B キー（全ゾーン塗りつぶし）。GND は表裏の全面ベタで接続する設計なので、塗りつぶさないと GND が未接続のままです 3. DRC を実行。想定は「未接続 0／クリアランス違反 0」です。シルクとパッドの重なりなど軽微な警告は出ることがあります 4. 回路図で ERC を実行（GND の PWRFLAG は配置済み） 5. ツール → 「回路図から PCB を更新」で差分が出ないこと（シンボルとフットプリントは UUID で紐づけ済み）を確認 6. 製造ファイル出力 → Gerber＋ドリル。BOM/CPL は jlc/` のものを使用
Main components on the Tomtho slim
Tomtho slim bill of materials (BOM)
130 components, 19 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | MDBT50Q-1MV2 | Raytac_MDBT50Q | U1 |
| 1 | USBLC6-2SC6 | SOT-23-6 | U2 |
| 1 | MCP73831T-2ACI/OT MCP73831 | SOT-23-5 | U3 |
| 1 | AO3401A | SOT-23 | Q1 |
| 1 | TYPE-C-31-M-12 USB-C | USB_C_HRO_TYPE-C-31-M-12 | J1 |
| 1 | SM02B-SRSS-TB(LF)(SN) BATTERY | JST_SH_SM02B-SRSS-TB | J2 |
| 54 | SKRAAWE010 | SW_ALPS_SKRA_6.2mm | SW1, SW2, SW3, SW4, SW5, SW6, SW7, SW8 +46 |
| 1 | TS-1928-B RESET | SW_TS-1928-B | SW55 |
| 1 | PCM12SMTR POWER | SW_SPDT_PCM12 | SW56 |
| 1 | KT-0603R RED | LED_0603 | LED1 |
| 54 | 1N4148W | D_SOD-123 | D1, D2, D3, D4, D5, D6, D7, D8 +46 |
| 1 | B5819W SL B5819W | D_SOD-123 | D55 |
| 4 | CL10A475KO8NNNC 4.7uF | C_0603 | C1, C4, C6, C7 |
| 1 | CL10A106KP8NNNC 10uF | C_0603 | C2 |
| 2 | CC0603KRX7R9BB104 100nF | C_0603 | C3, C5 |
| 2 | 0603WAF5101T5E 5.1k | R_0603 | R1, R2 |
| 1 | 0603WAF1002T5E 10k | R_0603 | R3 |
| 1 | 0603WAF1001T5E 1k | R_0603 | R4 |
| 1 | 0603WAF1003T5E 100k | R_0603 | R5 |
Tomtho slim design files
The KiCad project lives in the lou12de39r/tomtho-slim repository on GitHub; these links point at the commit this page was built from.
- Layouttomtho_slim.kicad_pcb
- Schematictomtho_slim.kicad_sch
- BOMjlc/tomtho_slim_BOM.csv
Tomtho slim: common questions
What microcontroller does the Tomtho slim use?
The Tomtho slim is built around the MDBT50Q-1MV2, from the Nordic nRF family.
How big is the Tomtho slim PCB?
The Tomtho slim measures 262 × 93.5 mm, has 2 copper layers and is 1.2 mm thick.
How many components are on the Tomtho slim?
130 components, from 19 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.
Where can I download the Tomtho slim design files?
From the lou12de39r/tomtho-slim repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.
Can I use the Tomtho slim design in my own project?
The repository has no license, so all rights stay with lou12de39r. Use it as a reference, and ask the author before reusing the design.
Can I test firmware for the Tomtho slim without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug Nordic nRF firmware against it before you order a PCB.
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