

Overview
The B3FS-4055P is a tactile Switche made by Omron in a SMD-4P,12x12mm package with 4 pins. -25℃~+70℃ 1,000,000 cycles 12mm 12mm 2.6N 24V 50mA 7.3mm Gull Wing Round Button SPST-NO Surface Mount,Vertical SMD-4P,12x12mm Tactile Switches ROHS.
PCBKit's library has its footprint (EasyEDA_Cloud:KEY-SMD_4P-L12.0-W12.0-P5.00-LS15.0, from EasyEDA), ready for a KiCad board. 1,486 are in stock at JLCPCB (part C2733614). 4 open-source boards in 2 repositories on GitHub use it.
Symbol
The library has no symbol for this part yet.
Footprint
Parameters
12- Actuator Style
- Round Button
- Circuit
- SPST-NO
- Contact Current
- 50mA
- Length
- 12mm
- Life
- 1,000,000 cycles
- Mounting Type
- Surface Mount,Vertical
- Operating Force
- 2.6N
- Operating Temperature
- -25℃~+70℃
- Switch Height
- 7.3mm
- Termination Style
- Gull Wing
- Voltage Rating
- 24V
- Width
- 12mm
Order codes
1- B3FS-4055PLCSC C2733614
Open-source boards using it
All 4- 4 layers70 × 70 mm

- 4 layers293 × 406 mm

- 4 layers93 × 171 mm

- 4 layers153 × 81 mm

Show this part on your page
<iframe src="https://pcbkit.io/embed/parts/omron/B3FS-4055P" title="B3FS-4055P in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe><img src="https://pcbkit.io/embed/parts/omron/B3FS-4055P.jpg" alt="B3FS-4055P" width="1200" height="900">[](https://pcbkit.io/parts/omron/B3FS-4055P)Questions
Is there a KiCad symbol and footprint for the B3FS-4055P?
Yes. the footprint EasyEDA_Cloud:KEY-SMD_4P-L12.0-W12.0-P5.00-LS15.0, both drawn on this page. PCBKit places them on a board for you when you design with it.
What package is the B3FS-4055P?
SMD-4P,12x12mm, with 4 pins. Its footprint is drawn on this page.
Where is the B3FS-4055P datasheet?
Omron publishes it: the Datasheet link on this page opens it.
Where can I order the B3FS-4055P?
JLCPCB lists it as part C2733614, with 1,486 in stock; the sellers' links on this page open their listings.
What can replace the B3FS-4055P?
Parts like it in the library: the B3FS-4005P by Omron, the TS-1103S-5026 by SOFNG, the B3FS-4052P by Omron and the SFS12WSSMTR LFS by C&K. Check their datasheets: a part that fits the footprint may still differ in its ratings.
Which open-source boards use the B3FS-4055P?
4 boards in 2 repositories on GitHub; the most starred are listed on this page, with their KiCad files.
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