
Filament dryer monitor
alessandrocardelli/filament-dryer-monitor
ESP32 controller for eSUN eBOX Lite. main is the non-heating SAFE BRING-UP reference; its heater output remains locked OFF.

The L7987L is a DC DC Converter made by STMicroelectronics in a HTSSOP-16-EP package with 17 pins. -40℃~+150℃ 1 11uA 250kHz~1.5MHz 2A 4.5V~61V Adjustable Buck Buck Built-in No HTSSOP-16-EP DC-DC Converters ROHS.
PCBKit's library has its KiCad symbol (EasyEDA_Cloud:L7987L, from EasyEDA) and its footprint (EasyEDA_Cloud:HTSSOP-16_L5.0-W4.4-P0.65-LS6.4-BL-EP, from EasyEDA), ready for a KiCad board. 15 are in stock at JLCPCB (part C222123). 1 open-source board in 1 repository on GitHub use it.
| Pin | Name | Type |
|---|---|---|
| 1 | VBIAS | Unspecified |
| 2 | VIN | Unspecified |
| 3 | VIN | Unspecified |
| 4 | VCC | Unspecified |
| 5 | EN | Unspecified |
| 6 | SS | Unspecified |
| 7 | SYNCH | Unspecified |
| 8 | COMP | Unspecified |
| 9 | FB | Unspecified |
| 10 | FSW | Unspecified |
| 11 | ILIM | Unspecified |
| 12 | PGOOD | Unspecified |
| 13 | LX | Unspecified |
| 14 | LX | Unspecified |
| 15 | BOOT | Unspecified |
| 16 | GND | Unspecified |
| 17 | EPAD | Unspecified |

alessandrocardelli/filament-dryer-monitor
ESP32 controller for eSUN eBOX Lite. main is the non-heating SAFE BRING-UP reference; its heater output remains locked OFF.
<iframe src="https://pcbkit.io/embed/parts/st/L7987L" title="L7987L in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe><img src="https://pcbkit.io/embed/parts/st/L7987L.jpg" alt="L7987L" width="1200" height="900">[](https://pcbkit.io/parts/st/L7987L)Yes. The symbol is EasyEDA_Cloud:L7987L and the footprint EasyEDA_Cloud:HTSSOP-16_L5.0-W4.4-P0.65-LS6.4-BL-EP, both drawn on this page. PCBKit places them on a board for you when you design with it.
HTSSOP-16-EP, with 17 pins. Its footprint is drawn on this page.
STMicroelectronics publishes it: the Datasheet link on this page opens it.
JLCPCB lists it as part C222123, with 15 in stock; the sellers' links on this page open their listings.
Parts like it in the library: the TPS54394PWP by Texas Instruments, the A7987 by STMicroelectronics, the LM536025QPWPTQ1 by Texas Instruments and the LM53603AMPWP by Texas Instruments. Check their datasheets: a part that fits the footprint may still differ in its ratings.
1 board in 1 repository on GitHub; the most starred are listed on this page, with their KiCad files.