

Overview
The M28S is a bipolar made by ALJ in a SOT-23 package with 3 pins. -55℃~+150℃ 1 NPN 1000 100MHz 100nA 1A 200mW 20V 550mV 6V NPN SOT-23 Bipolar (BJT) ROHS.
PCBKit's library has its footprint (Package_TO_SOT_SMD:SOT-23, from KiCad's library), ready for a KiCad board. 3,004 are in stock at JLCPCB (part C22458947). 2 open-source boards in 2 repositories on GitHub use it.
Symbol
The library has no symbol for this part yet.
Footprint
Parameters
11- Collector - Emitter Voltage VCEO
- 20V
- Current - Collector Cutoff
- 100nA
- Current - Collector(Ic)
- 1A
- DC Current Gain
- 1000
- Emitter-Base Voltage(Vebo)
- 6V
- Number
- 1 NPN
- Operating Temperature
- -55℃~+150℃
- Pd - Power Dissipation
- 200mW
- Transition frequency(fT)
- 100MHz
- Vce Saturation(VCE(sat))
- 550mV
- type
- NPN
Order codes
1- M28SLCSC C22458947
Open-source boards using it
All 2- 4 layers49.6 × 49 mm

- 4 layers115.5 × 14.4 mm

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<iframe src="https://pcbkit.io/embed/parts/alj/M28S" title="M28S in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe><img src="https://pcbkit.io/embed/parts/alj/M28S.jpg" alt="M28S" width="1200" height="900">[](https://pcbkit.io/parts/alj/M28S)Questions
Is there a KiCad symbol and footprint for the M28S?
Yes. 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 M28S?
SOT-23, with 3 pins. Its footprint is drawn on this page.
Where is the M28S datasheet?
ALJ publishes it: the Datasheet link on this page opens it.
Where can I order the M28S?
JLCPCB lists it as part C22458947, with 3,004 in stock; the sellers' links on this page open their listings.
What can replace the M28S?
Parts like it in the library: the SS8050 by hongjiacheng, the SS8050 by MDD, the SS8550 by hongjiacheng and the SS8550 Y2 by Jiangsu Changjing Electronics Technology (CJ). Check their datasheets: a part that fits the footprint may still differ in its ratings.
Which open-source boards use the M28S?
2 boards in 2 repositories on GitHub; the most starred are listed on this page, with their KiCad files.
Parts like it
8SS8050
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SOT-23-55℃~+150℃ 1 PNP 1.5A 100MHz 100nA 200 25V 300mW 500mV 5V PNP SOT-23 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)SS8550 Y2
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SOT-23Bipolar (BJT)TDSEMICSS8550
SOT-23-55℃~+150℃ 1 PNP 1.5A 100MHz 100nA 25V 300mW 400 500mV 5V PNP SOT-23 Bipolar (BJT) ROHSMDDBipolar (BJT)