
Esp32-4to20ma board
Diode663/ESP32_4-20mA_Sensor
Single-channel industrial 4-20 mA current-loop reader for ESPHome / Home Assistant. ESP32-S3 + INA226, USB-C powered, 24 V loop supply with a constant-current limiter. KiCad 10, generated from Python.

The BCP53-16 is a bipolar made by Jiangsu Changjing Electronics Technology (CJ) in a SOT-223 package with 4 pins. -65℃~+150℃ 1 PNP 1.5W 100 100MHz 100nA 1A 500mV 5V 80V PNP SOT-223 Bipolar (BJT) ROHS.
PCBKit's library has its KiCad symbol (Transistor_BJT:BCP53, from KiCad's library) and its footprint (Package_TO_SOT_SMD:SOT-223, from KiCad's library), ready for a KiCad board. 51,755 are in stock at JLCPCB (part C148109). 3 open-source boards in 3 repositories on GitHub use it.
| Pin | Name | Type |
|---|---|---|
| 1 | B | Input |
| 2 | C | Passive |
| 3 | E | Passive |
| 4 | C | Passive |

Diode663/ESP32_4-20mA_Sensor
Single-channel industrial 4-20 mA current-loop reader for ESPHome / Home Assistant. ESP32-S3 + INA226, USB-C powered, 24 V loop supply with a constant-current limiter. KiCad 10, generated from Python.


PE1RGU/hf-antenna-switch
Remote HF antenna switch: 3 radios x 4 antennas (path to 8), outdoor relay unit with a hardware safety chain, controlled over Cat6 from a shack interface. KiCad 10, open hardware, designed together with an AI.
<iframe src="https://pcbkit.io/embed/parts/cj/BCP53-16" title="BCP53-16 in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe><img src="https://pcbkit.io/embed/parts/cj/BCP53-16.jpg" alt="BCP53-16" width="1200" height="900">[](https://pcbkit.io/parts/cj/BCP53-16)Yes. The symbol is Transistor_BJT:BCP53 and the footprint Package_TO_SOT_SMD:SOT-223, both drawn on this page. PCBKit places them on a board for you when you design with it.
SOT-223, with 4 pins. Its footprint is drawn on this page.
Jiangsu Changjing Electronics Technology (CJ) publishes it: the Datasheet link on this page opens it.
JLCPCB lists it as part C148109, with 51,755 in stock; the sellers' links on this page open their listings.
Parts like it in the library: the BCP56 by HXY MOSFET, the BCP56 by Jiangsu Changjing Electronics Technology (CJ), the PBSS4350Z by Nexperia and the 2STN1550 by STMicroelectronics. Check their datasheets: a part that fits the footprint may still differ in its ratings.
3 boards in 3 repositories on GitHub; the most starred are listed on this page, with their KiCad files.