

Overview
The MMBFJ309 is a JFET made by onsemi in a SOT-23 package with 3 pins. -55℃~+150℃ 1 N-channel 25V 2V 2pF 30mA 350mW N-Channel SOT-23 JFETs ROHS.
PCBKit's library has its KiCad symbol (EasyEDA_Cloud:J111, from EasyEDA) and its footprint (Package_TO_SOT_SMD:SOT-23, from KiCad's library), ready for a KiCad board. JLCPCB lists it (part C274689). 3 open-source boards in 3 repositories on GitHub use it.
Symbol
Footprint
Parameters
8- Drain Current (Idss)
- 30mA
- FET Type
- N-Channel
- Gate-Source Breakdown Voltage (Vgss)
- 25V
- Gate-Source Cutoff Voltage (VGS(off))
- 2V
- Number
- 1 N-channel
- Operating Temperature
- -55℃~+150℃
- Pd - Power Dissipation
- 350mW
- Reverse Transfer Capacitance (Crss)
- 2pF
Order codes
1- MMBFJ309LCSC C274689
Pinout
3| Pin | Name | Type |
|---|---|---|
| 1 | D | Unspecified |
| 2 | S | Unspecified |
| 3 | G | Unspecified |
Open-source boards using it
All 3- 2 layers99 × 128.5 mm

- 4 layers16.2 × 23.2 mm

AART11
ImbaNagibator/slot-car-ecom
This repo contains a KiCad design, documentation and ancillary artifacts for a slot car brushless motor electronic commutator or "eCom", also known as an Electronic Speed Controller (ESC).
82 partsCC0-1.0 - 2 layers19 × 108.4 mm

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<iframe src="https://pcbkit.io/embed/parts/onsemi/MMBFJ309" title="MMBFJ309 in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe><img src="https://pcbkit.io/embed/parts/onsemi/MMBFJ309.jpg" alt="MMBFJ309" width="1200" height="900">[](https://pcbkit.io/parts/onsemi/MMBFJ309)Questions
Is there a KiCad symbol and footprint for the MMBFJ309?
Yes. The symbol is EasyEDA_Cloud:J111 and the footprint Package_TO_SOT_SMD:SOT-23, both drawn on this page. PCBKit places them on a board for you when you design with it.
What package is the MMBFJ309?
SOT-23, with 3 pins. Its footprint is drawn on this page.
Where is the MMBFJ309 datasheet?
onsemi publishes it: the Datasheet link on this page opens it.
Where can I order the MMBFJ309?
JLCPCB lists it as part C274689, with 0 in stock; the sellers' links on this page open their listings.
What can replace the MMBFJ309?
Parts like it in the library: the MMBFJ111 by onsemi, the MMBF4093 by onsemi, the CMPF4391 TR TIN/LEAD by Central Semicon and the CMPF4392 TR PBFREE by Central Semicon. Check their datasheets: a part that fits the footprint may still differ in its ratings.
Which open-source boards use the MMBFJ309?
3 boards in 3 repositories on GitHub; the most starred are listed on this page, with their KiCad files.
Parts like it
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