

Overview
The BD433 is a bipolar made by ISC in a TO-126 package with 3 pins. TO-126 Bipolar (BJT) ROHS.
PCBKit's library has its KiCad symbol (Transistor_BJT:BD433, from KiCad's library) and its footprint (Package_TO_SOT_THT:TO-126-3_Vertical, from KiCad's library), ready for a KiCad board. JLCPCB lists it (part C2984018). 4 open-source boards in 3 repositories on GitHub use it.
Symbol
Footprint
Order codes
1- BD433LCSC C2984018
Pinout
3| Pin | Name | Type |
|---|---|---|
| 1 | E | Passive |
| 2 | C | Passive |
| 3 | B | Input |
Open-source boards using it
All 4- 2 layers

- 2 layers100 × 100 mm

PIDController - Copy - Copy
rherzal/AnalogPIDController
The project is a full design and implementation of an analog PID controller pcb, using only operational amplifiers for calculations, used to control a DC motor.
26 parts1 - 2 layers78 × 58 mm

HAT
ManchesterStingerMotorsports/johnson-node
Fully modular CAN node hardware and firmware libraries
41 parts2 - 2 layers78 × 58 mm

IGL
ManchesterStingerMotorsports/johnson-node
Fully modular CAN node hardware and firmware libraries
12 parts2
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<iframe src="https://pcbkit.io/embed/parts/isc/BD433" title="BD433 in PCBKit" width="100%" height="480" style="border:0;border-radius:12px" allow="fullscreen" loading="lazy"></iframe><img src="https://pcbkit.io/embed/parts/isc/BD433.jpg" alt="BD433" width="1200" height="900">[](https://pcbkit.io/parts/isc/BD433)Questions
Is there a KiCad symbol and footprint for the BD433?
Yes. The symbol is Transistor_BJT:BD433 and the footprint Package_TO_SOT_THT:TO-126-3_Vertical, both drawn on this page. PCBKit places them on a board for you when you design with it.
What package is the BD433?
TO-126, with 3 pins. Its footprint is drawn on this page.
Where can I order the BD433?
JLCPCB lists it as part C2984018, with 0 in stock; the sellers' links on this page open their listings.
What can replace the BD433?
Parts like it in the library: the BD139 by STMicroelectronics, the BD140 by STMicroelectronics, the BD139-16 by STMicroelectronics and the BD139(RANGE:100-250) 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 BD433?
4 boards in 3 repositories on GitHub; the most starred are listed on this page, with their KiCad files.
Parts like it
8BD139
TO-126-65℃~+150℃ 1 NPN 1.5A 10uA 12.5W 500mV 5V 63 80V NPN TO-126 Bipolar (BJT) ROHSSTMicroelectronicsBipolar (BJT)BD140
TO-126-65℃~+150℃ 1 PNP 1.25W 1.5A 100nA 500mV 5V 63 80V PNP TO-126 Bipolar (BJT) ROHSSTMicroelectronicsBipolar (BJT)BD139-16
SOT-32-3-65℃~+150℃ 1 NPN 1.5A 100 10uA 12.5W 500mV 5V 80V NPN SOT-32-3 Bipolar (BJT) ROHSSTMicroelectronicsBipolar (BJT)BD139(RANGE:100-250)
TO-126-31 NPN 1.25W 1.5A 100nA 250 500mV 5V 80V NPN TO-126-3 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)BD237
TO-126F-3-55℃~+150℃ 1 NPN 100uA 25 25W 2A 3MHz 5V 600mV 80V NPN TO-126F-3 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)BD139
TO-1261 NPN 1.25W 1.5A 100nA 120V 200@150mA,2V 500mV@500mA,50mA 5V Independent NPN TO-126 Bipolar (BJT) ROHSluJingBipolar (BJT)BD138
TO-126-55℃~+150℃ 1 PNP 1.25W 1.5A 100nA 40 500mV 5V 60V PNP TO-126 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)BD140
TO-126-55℃~+150℃ 1 PNP 1.25W 1.5A 100nA 40 500mV 5V 80V PNP TO-126 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)