

Overview
The MJD122 is a darlington Transistor made by Jiangsu Changjing Electronics Technology (CJ) in a TO-251(IPAK) package with 3 pins. -55℃~+150℃ 1.5W 100V 10uA 12000 4.5V 4V@8A,80mA 5V 8A NPN TO-252-2L Darlington Transistors ROHS.
PCBKit's library has its KiCad symbol (Transistors:NPN B1 E2 C3, from CERN's library) and its footprint (ICs And Semiconductors SMD:TO228P991X239-3N-R546X521, from CERN's library), ready for a KiCad board. 157,940 are in stock at JLCPCB (part C59488). 6 open-source boards in 6 repositories on GitHub use it.
Symbol
Footprint
Parameters
11- Collector - Emitter Voltage VCEO
- 100V
- Current - Collector Cutoff
- 10uA
- Current - Collector(Ic)
- 8A
- DC Current Gain
- 12000
- Emitter-Base Voltage VEBO
- 5V
- Operating Temperature
- -55℃~+150℃
- Pd - Power Dissipation
- 1.5W
- Type
- NPN
- Vbe On(VBE(on))
- 2.8V
- Vbe Saturation(VBE(sat))
- 4.5V
- Vce Saturation(VCE(sat))
- 4V@8A,80mA
Order codes
2- MJD122LCSC C188196
- MJD122LCSC C59488
Pinout
3| Pin | Name | Type |
|---|---|---|
| 1 | B | Passive |
| 2 | E | Passive |
| 3 | C | Passive |
Open-source boards using it
All 6- 2 layers80 × 47.1 mm

- 2 layers90 × 80 mm

- 2 layers140 × 70 mm

- 2 layers97.2 × 58.4 mm

- 2 layers56 × 120 mm

- 2 layers50 × 50 mm

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Is there a KiCad symbol and footprint for the MJD122?
Yes. The symbol is Transistors:NPN B1 E2 C3 and the footprint ICs And Semiconductors SMD:TO228P991X239-3N-R546X521, both drawn on this page. PCBKit places them on a board for you when you design with it.
What package is the MJD122?
TO-251(IPAK), with 3 pins. Its footprint is drawn on this page.
Where is the MJD122 datasheet?
Jiangsu Changjing Electronics Technology (CJ) publishes it: the Datasheet link on this page opens it.
Where can I order the MJD122?
JLCPCB lists it as part C59488, with 157,940 in stock; the sellers' links on this page open their listings.
Which open-source boards use the MJD122?
6 boards in 6 repositories on GitHub; the most starred are listed on this page, with their KiCad files.