4 layers94 × 50.8 mm
Overview
The BC857 is a bipolar made by STMicroelectronics in a SOT-23 package with 3 pins. 1 PNP 100MHz 100mA 15nA 200mW 45V 5V 650mV 800 PNP SOT-23 Bipolar (BJT) ROHS.
PCBKit's library has its KiCad symbol (Transistor_BJT:BC857, from KiCad's library) and its footprint (Package_TO_SOT_SMD:SOT-23, from KiCad's library), ready for a KiCad board. 28,255 are in stock at JLCPCB (part C148244). 138 open-source boards in 117 repositories on GitHub use it.
Symbol
Footprint
Parameters
10- Collector - Emitter Voltage VCEO
- 45V
- Current - Collector Cutoff
- 15nA
- Current - Collector(Ic)
- 100mA
- DC Current Gain
- 800
- Emitter-Base Voltage(Vebo)
- 5V
- Number
- 1 PNP
- Pd - Power Dissipation
- 200mW
- Transition frequency(fT)
- 100MHz
- Vce Saturation(VCE(sat))
- 650mV
- type
- PNP
Order codes
1- BC857LCSC C148244
Pinout
3| Pin | Name | Type |
|---|---|---|
| 1 | B | Input |
| 2 | E | Passive |
| 3 | C | Passive |
Open-source boards using it
All 138- 4 layers124.6 × 68.7 mm
- 2 layers200 × 100 mm
Polykit x monosynth
polykit/polykit-x-monosynth
The Polykit X1 is a DIY semi-modular, analog, patchable synthesizer
167 parts94 - 2 layers91.2 × 48.3 mm
- 2 layers128 × 80 mm
- 4 layers48.2 × 46.2 mm
- 2 layers281.1 × 236.5 mm
MiniDrumkit2
Fihdi/MiniDrumkit
Eurorack DrumKit module with a 3 channel wave-file player and analog Hi-Hat and Kick Drum sections
239 parts15MIT - 2 layers124 × 40 mm
RedFIS
tothpetiszilard/a3_8p_redFIS
Hacking into Audi A3 8P Driver Information System
77 parts15AGPL-3.0
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<iframe src="https://pcbkit.io/embed/parts/st/BC857" title="BC857 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/BC857.jpg" alt="BC857" width="1200" height="900">[](https://pcbkit.io/parts/st/BC857)Questions
Is there a KiCad symbol and footprint for the BC857?
Yes. The symbol is Transistor_BJT:BC857 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 BC857?
SOT-23, with 3 pins. Its footprint is drawn on this page.
Where is the BC857 datasheet?
STMicroelectronics publishes it: the Datasheet link on this page opens it.
Where can I order the BC857?
JLCPCB lists it as part C148244, with 28,255 in stock; the sellers' links on this page open their listings.
What can replace the BC857?
Parts like it in the library: the MMBT3904 by hongjiacheng, the S8050 by hongjiacheng, the SS8050 by hongjiacheng and the MMBT5551 by hongjiacheng. Check their datasheets: a part that fits the footprint may still differ in its ratings.
Which open-source boards use the BC857?
138 boards in 117 repositories on GitHub; the most starred are listed on this page, with their KiCad files.
Parts like it
8
MMBT3904
SOT-23-55℃~+150℃ 1 NPN 100 100nA 200mA 200mW 300MHz 300mV 40V 6V NPN SOT-23 Bipolar (BJT) ROHShongjiachengBipolar (BJT)S8050
SOT-23-55℃~+150℃ 1 NPN 100MHz 100nA 120 25V 300mW 500mA 5V 600mV NPN SOT-23 Bipolar (BJT) ROHShongjiachengBipolar (BJT)SS8050
SOT-23-55℃~+150℃ 1 NPN 1.5A 100MHz 100nA 120 25V 300mW 500mV 5V NPN SOT-23 Bipolar (BJT) ROHShongjiachengBipolar (BJT)MMBT5551
SOT-23-55℃~+150℃ 1 NPN 100 100MHz 150mV 160V 300mW 50nA 600mA 6V NPN SOT-23 Bipolar (BJT) ROHShongjiachengBipolar (BJT)MMBT5401
SOT-23-55℃~+150℃ 1 PNP 100 100MHz 100nA 160V 200mV 300mW 5V 600mA PNP SOT-23 Bipolar (BJT) ROHShongjiachengBipolar (BJT)MMBT3904
SOT-23-55℃~+150℃ 1 NPN 100 100nA 200mA 200mW 300MHz 300mV 40V 6V NPN SOT-23 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)MMBT5551
SOT-23-55℃~+150℃ 1 NPN 160V 200 200mV 300MHz 300mW 50nA 600mA 6V NPN SOT-23 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)S8050 J3Y
SOT-23-55℃~+150℃ 1 NPN 100nA 150MHz 200 25V 300mW 500mA 5V 600mV NPN SOT-23 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)