
Better Klipper Expander
Fisheiyy/Better-Klipper-Expander
A RP2040 based 3D Printer Port Expander
The S1A is a diodes General Purpose made by Diodes Incorporated in a SMA(DO-214AC) package with 2 pins. 1 Independent 1.1V@1A 1A 30A 50V 5uA@50V SMA(DO-214AC) Diodes - General Purpose ROHS.
PCBKit's library has its KiCad symbol (Device:D, from KiCad's library) and its footprint (Diode_SMD:D_SMA, from KiCad's library), ready for a KiCad board. 3,214 are in stock at JLCPCB (part C150735). 21 open-source boards in 18 repositories on GitHub use it.
| Parameter | Conditions | As printed | Page |
|---|---|---|---|
| Peak Repetitive Reverse Voltage VRRM | S1A; TA = +25°C | max 50 V | 2 |
| Working Peak Reverse Voltage VRWM | S1A; TA = +25°C | max 50 V | 2 |
| DC Blocking Voltage VR | S1A; TA = +25°C | max 50 V | 2 |
| RMS Reverse Voltage VR(RMS) | S1A; TA = +25°C | max 35 V | 2 |
| Average Rectified Output Current IO | TT = +100°C; single phase, half wave, 60Hz, resistive or inductive load; for capacitance load, derate current by 20% | max 1 A | 2 |
| Non-Repetitive Peak Forward Surge Current IFSM | TA = +25°C; 8.3ms Single Half Sine-Wave Superimposed on Rated Load | max 30 A | 2 |
| Typical Thermal Resistance, Junction to Terminal (Note 5) RθJT | Mounted on PC board with 5.0 mm² (0.013 mm thick) copper pads as heat sink | typ 30 °C/W | 2 |
| Operating and Storage Temperature Range TJ, TSTG | min -65 · max 150 °C | 2 | |
| Forward Voltage VFM | TA = +25°C; IF = 1.0A | max 1.1 V | 2 |
| Peak Reverse Leakage Current at Rated DC Blocking Voltage IRM | TA = +25°C | max 5 uA | 2 |
| Peak Reverse Leakage Current at Rated DC Blocking Voltage IRM | TA = +125°C | max 100 uA | 2 |
| Reverse Recovery Time (Note 6) trr | TA = +25°C; IF = 0.5A, IR = 1.0A, IRR = 0.25A | typ 1.8 · max 3 us | 2 |
| Typical Total Capacitance (Note 7) CT | TA = +25°C; 1.0MHz; applied reverse voltage of 4.0V DC | typ 10 pF | 2 |
| Pin | Name | Type |
|---|---|---|
| 1 | K | Passive |
| 2 | A | Passive |

Fisheiyy/Better-Klipper-Expander
A RP2040 based 3D Printer Port Expander


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<iframe src="https://pcbkit.io/embed/parts/diodes/S1A" title="S1A in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe><img src="https://pcbkit.io/embed/parts/diodes/S1A.jpg" alt="S1A" width="1200" height="900">[](https://pcbkit.io/parts/diodes/S1A)Yes. The symbol is Device:D and the footprint Diode_SMD:D_SMA, both drawn on this page. PCBKit places them on a board for you when you design with it.
SMA(DO-214AC), with 2 pins. Its footprint is drawn on this page.
Diodes Incorporated publishes it: the Datasheet link on this page opens it.
JLCPCB lists it as part C150735, with 3,214 in stock; the sellers' links on this page open their listings.
Parts like it in the library: the M7 by MDD, the M7 by hongjiacheng, the M7 by MSKSEMI and the M7 by Yangzhou Yangjie Electronic Technology. Check their datasheets: a part that fits the footprint may still differ in its ratings.
21 boards in 18 repositories on GitHub; the most starred are listed on this page, with their KiCad files.