4 layers124.6 × 68.7 mm
2 layers24.2 × 44 mm
Open STRD1806
Martin1995/open_STRD1806open hardware reconstruction of the STRD1806 hybrid IC for SMPS (switch mode power supply)
- Size
- 24.2 × 44 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 12
- Nets
- 9
- Pads
- 37
- Tracks, vias
- 75, 0
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 17 Oct 2026
- Updated
- 17 Oct 2026
Overview
Open STRD1806 is an open-source printed circuit board by Martin1995, from the Martin1995/open_STRD1806 repository on GitHub, published under the CERN-OHL-S-2.0 licence. It is a 2-layer board of 24.2 × 44 mm with 12 parts on 9 nets, routed with 75 tracks and 0 vias.
It is built around the BC847 and BC857. Its parts include 5 resistors, 3 transistors, 1 IC and 1 connector.
Main components
2README
README.mdopen_STRD1806
Open hardware reconstruction of the Sanken STR-D1806 hybrid IC for SMPS (Switch Mode Power Supplies).
🚨 Disclaimer & Safety Warning
- Status: This design is untested (Alpha), but mostly follows the original circuit design of the STR-D1806.
- Warranty: The schematic, PCB design, and manufacturing files are provided "as is" without any warranty or guarantee of function.
- Risk: High voltage is dangerous. The use, building, and testing of this design is entirely at your own risk.
⚡ Technical Specification
The circuit board is designed to work in switch-mode power supplies with input voltages up to 240V AC RMS (rectified to approximately 340V DC on the primary rail).
The PCB is designed as a single-sided board, optimized for Aluminum Substrate / IMS (Insulated Metal Substrate) manufacturing to ensure optimal thermal dissipation to the original heatsink of the PSU. The PCB accepts either D2PAK(TO-263) or TO-220 packages for the surface mounted Power NPN Transistor
License
The files are provided under the following license: CERN-OHL-S
Parts
12| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | R | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R1, R2, R3, R4 |
| 1 | 1K | Resistor_SMD:R_1206_3216Metric_Pad1.30x1.75mm_HandSolder | R5 |
| 1 | BC847 | PCM_Package_TO_SOT_SMD_AKL:SOT-23 | Q3 |
| 1 | BC857 | PCM_Package_TO_SOT_SMD_AKL:SOT-23 | Q2 |
| 1 | Conn_01x05 | Connector_PinHeader_2.54mm:PinHeader_1x05_P2.54mm_Vertical_SMD_Pin1Left | J1 |
| 1 | NPN | Package_TO_SOT_SMD_Custom:TO-263-3_+TO-220_Combo_TabPin2 | Q1 |
| 1 | R_Potentiometer | Potentiometer_SMD:Potentiometer_Bourns_3224G_Horizontal | RV1 |
| 1 | TL431DBZ | Package_TO_SOT_SMD:SOT-23 | U1 |
The 11 most common of 12 parts.
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Questions
How big is the Open STRD1806 PCB?
It measures 24.2 × 44 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Open STRD1806 use?
12 parts, built around the BC847 and BC857. 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 Open STRD1806 KiCad files?
From the Martin1995/open_STRD1806 repository on GitHub, at the commit this page was made from: the board is open_STRD1806.kicad_pcb and its schematic open_STRD1806.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Open STRD1806 design in my own project?
Its repository publishes it under the CERN-OHL-S-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).