
Mainboard v05
alxklso/ISP-cubesat
This is the repo for the Isomer Space Program (ISP) 1U CoyoteSat CubeSat mission.

The MMBT2222AT is a bipolar made by Jiangsu Changjing Electronics Technology (CJ) in a SOT-523 package with 3 pins. -55℃~+150℃ 1 NPN 1.2V 10nA 150mW 300MHz 35 40V 600mA 6V NPN SOT-523 Bipolar (BJT) ROHS.
PCBKit's library has its KiCad symbol (Transistor_BJT:MMBT2222A, from KiCad's library) and its footprint (Package_TO_SOT_SMD:SOT-23, from KiCad's library), ready for a KiCad board. 98,310 are in stock at JLCPCB (part C190608). 6 open-source boards in 5 repositories on GitHub use it.
| Parameter | Conditions | As printed | Page |
|---|---|---|---|
| Collector-Base Voltage VCBO | Ta=25℃ | max 75 V | 1 |
| Collector-Emitter Voltage VCEO | Ta=25℃ | max 40 V | 1 |
| Emitter-Base Voltage VEBO | Ta=25℃ | max 6 V | 1 |
| Collector Current IC | Ta=25℃ | max 600 mA | 1 |
| Collector Power Dissipation PC | Ta=25℃ | max 150 mW | 1 |
| Thermal Resistance from Junction to Ambient RΘJA | SOT-523, Ta=25℃ | max 833 ℃/W | 1 |
| Junction Temperature Tj | max 150 ℃ | 1 | |
| Storage Temperature Tstg | min -55 · max 150 ℃ | 1 | |
| Collector-base breakdown voltage V(BR)CBO | IC=10uA, IE=0 | min 75 V | 1 |
| Collector-emitter breakdown voltage V(BR)CEO | IC=10mA, IB=0 | min 40 V | 1 |
| Emitter-base breakdown voltage V(BR)EBO | IE=10uA, IC=0 | min 6 V | 1 |
| Collector cut-off current ICEX | VCE=60V, VEB(off)=3V | max 10 nA | 1 |
| DC current gain hFE(1) | VCE=10V, IC=0.1mA | min 35 | 1 |
| DC current gain hFE(2) | VCE=10V, IC=1mA | min 50 | 1 |
| DC current gain hFE(3) | VCE=10V, IC=10mA | min 75 | 1 |
| DC current gain hFE(4) | VCE=10V, IC=150mA | min 100 · max 300 | 1 |
| DC current gain hFE(5) | VCE=10V, IC=500mA | min 40 | 1 |
| Collector-emitter saturation voltage VCE(sat) | IC=150mA, IB=15mA | max 0.3 V | 1 |
| Collector-emitter saturation voltage VCE(sat) | IC=500mA, IB=50mA | max 1 V | 1 |
| Collector-emitter saturation voltage VBE(sat) | IC=150mA, IB=15mA | max 1.2 V | 1 |
| Collector-emitter saturation voltage VBE(sat) | IC=500mA, IB=50mA | max 2 V | 1 |
| Transition frequency fT | VCE=20V, IC=20mA, f=100MHz | min 300 MHz | 1 |
| Collector output capacitance Cob | VCB=10V, IE=0, f=1MHz | max 8 pF | 1 |
| Delay time td | VCC=30V, VBE(off)=-0.5V, IC=150mA, IB1=15mA | max 10 ns | 1 |
| Rise time tr | VCC=30V, VBE(off)=-0.5V, IC=150mA, IB1=15mA | max 25 ns | 1 |
| Storage time ts | VCC=30V, IC=150mA, IB1=IB2=15mA | max 225 ns | 1 |
| Fall time tf | VCC=30V, IC=150mA, IB1=IB2=15mA | max 60 ns | 1 |
| Pin | Name | Type |
|---|---|---|
| 1 | B | Input |
| 2 | E | Passive |
| 3 | C | Passive |

alxklso/ISP-cubesat
This is the repo for the Isomer Space Program (ISP) 1U CoyoteSat CubeSat mission.



proveskit/proves-prime-mainboard
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proveskit/battery_board
The battery and power management board for the PROVES Kit.

<iframe src="https://pcbkit.io/embed/parts/cj/MMBT2222AT" title="MMBT2222AT in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe><img src="https://pcbkit.io/embed/parts/cj/MMBT2222AT.jpg" alt="MMBT2222AT" width="1200" height="900">[](https://pcbkit.io/parts/cj/MMBT2222AT)Yes. The symbol is Transistor_BJT:MMBT2222A 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.
SOT-523, with 3 pins. Its footprint is drawn on this page.
Jiangsu Changjing Electronics Technology (CJ) publishes it: the Datasheet link on this page opens it.
JLCPCB lists it as part C190608, with 98,310 in stock; the sellers' links on this page open their listings.
Parts like it in the library: the SS8050 by hongjiacheng, the MMBT5551 by hongjiacheng, the MMBT5401 by hongjiacheng and the MMBT5551 by Jiangsu Changjing Electronics Technology (CJ). Check their datasheets: a part that fits the footprint may still differ in its ratings.
6 boards in 5 repositories on GitHub; the most starred are listed on this page, with their KiCad files.