

Overview
The MJD31CT4 is a bipolar made by STMicroelectronics in a DPAK package with 3 pins. -65℃~+150℃ 1 NPN 1.2V 100V 15W 25 3A 50uA 5V NPN DPAK Bipolar (BJT) ROHS.
PCBKit's library has its KiCad symbol (Pinmap_Generic:Q_NPN_1B_2E_3C, from PCBKit's generic symbols) and its footprint (EasyEDA_Cloud:DPAK-2_L6.5-W6.1-P4.50-LS9.7-BR, from EasyEDA), ready for a KiCad board. 7,201 are in stock at JLCPCB (part C2969834). 1 open-source board in 1 repository on GitHub use it.
Symbol
Footprint
Parameters
11- Collector - Emitter Voltage VCEO
- 100V
- Configuration
- Standalone
- Current - Collector Cutoff
- 50uA
- Current - Collector(Ic)
- 3A
- DC Current Gain
- 25
- Emitter-Base Voltage(Vebo)
- 5V
- Number
- 1 NPN
- Operating Temperature
- -65℃~+150℃
- Pd - Power Dissipation
- 15W
- Vce Saturation(VCE(sat))
- 1.2V
- type
- NPN
Order codes
1- MJD31CT4LCSC C2969834
Pinout
3| Pin | Name | Type |
|---|---|---|
| 1 | B | Input |
| 2 | E | Passive |
| 3 | C | Passive |
Open-source boards using it
All 1- 2 layers100 × 100 mm

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<iframe src="https://pcbkit.io/embed/parts/st/MJD31CT4" title="MJD31CT4 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/MJD31CT4.jpg" alt="MJD31CT4" width="1200" height="900">[](https://pcbkit.io/parts/st/MJD31CT4)Questions
Is there a KiCad symbol and footprint for the MJD31CT4?
Yes. The symbol is Pinmap_Generic:Q_NPN_1B_2E_3C and the footprint EasyEDA_Cloud:DPAK-2_L6.5-W6.1-P4.50-LS9.7-BR, both drawn on this page. PCBKit places them on a board for you when you design with it.
What package is the MJD31CT4?
DPAK, with 3 pins. Its footprint is drawn on this page.
Where is the MJD31CT4 datasheet?
STMicroelectronics publishes it: the Datasheet link on this page opens it.
Where can I order the MJD31CT4?
JLCPCB lists it as part C2969834, with 7,201 in stock; the sellers' links on this page open their listings.
What can replace the MJD31CT4?
Parts like it in the library: the STD1802T4 by STMicroelectronics. Check their datasheets: a part that fits the footprint may still differ in its ratings.
Which open-source boards use the MJD31CT4?
1 board in 1 repository on GitHub; the most starred are listed on this page, with their KiCad files.