

Overview
The BD438 is a bipolar made by STMicroelectronics in a TO-126-3 package with 3 pins. -65℃~+150℃ 1 PNP 100uA 130 200mV 36W 3MHz 45V 4A 5V PNP TO-126-3 Bipolar (BJT) ROHS.
PCBKit's library has its KiCad symbol (Transistor_BJT:BD438, from KiCad's library) and its footprint (Package_TO_SOT_THT:TO-126-3_Vertical, from KiCad's library), ready for a KiCad board. 377 are in stock at JLCPCB (part C2832765). 1 open-source board in 1 repository on GitHub use it.
Symbol
Footprint
Parameters
12- Collector - Emitter Voltage VCEO
- 45V
- Configuration
- Standalone
- Current - Collector Cutoff
- 100uA
- Current - Collector(Ic)
- 4A
- DC Current Gain
- 130
- Emitter-Base Voltage(Vebo)
- 5V
- Number
- 1 PNP
- Operating Temperature
- -65℃~+150℃
- Pd - Power Dissipation
- 36W
- Transition frequency(fT)
- 3MHz
- Vce Saturation(VCE(sat))
- 200mV
- type
- PNP
Order codes
1- BD438LCSC C2832765
Pinout
3| Pin | Name | Type |
|---|---|---|
| 1 | E | Passive |
| 2 | C | Passive |
| 3 | B | Input |
Open-source boards using it
All 1- 2 layers238 × 67 mm

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<iframe src="https://pcbkit.io/embed/parts/st/BD438" title="BD438 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/BD438.jpg" alt="BD438" width="1200" height="900">[](https://pcbkit.io/parts/st/BD438)Questions
Is there a KiCad symbol and footprint for the BD438?
Yes. The symbol is Transistor_BJT:BD438 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 BD438?
TO-126-3, with 3 pins. Its footprint is drawn on this page.
Where is the BD438 datasheet?
STMicroelectronics publishes it: the Datasheet link on this page opens it.
Where can I order the BD438?
JLCPCB lists it as part C2832765, with 377 in stock; the sellers' links on this page open their listings.
What can replace the BD438?
Parts like it in the library: the BD441 by onsemi, the BD437 by YFW, the BD438 by YFW and the BD437 by STMicroelectronics. Check their datasheets: a part that fits the footprint may still differ in its ratings.
Which open-source boards use the BD438?
1 board in 1 repository on GitHub; the most starred are listed on this page, with their KiCad files.
Parts like it
8BD441
TO-225-31 NPN 100uA 200mV 30 36W 3MHz 45V 4A NPN TO-225-3 Bipolar (BJT) ROHSonsemiBipolar (BJT)BD437
TO-1261 NPN 100uA 140 36W 3MHz 45V 4A 500mV@2A,0.2A 5V Independent NPN TO-126 Bipolar (BJT) ROHSYFWBipolar (BJT)BD438
TO-1261 PNP 100uA 140 36W 3MHz 45V 4A 500mV@2A,0.2A 5V Independent PNP TO-126 Bipolar (BJT) ROHSYFWBipolar (BJT)BD437
TO-126-65℃~+150℃ 1 NPN 100uA 200mV 30 36W 3MHz 45V 4A 5V NPN TO-126 Bipolar (BJT) ROHSSTMicroelectronicsBipolar (BJT)BD438S
TO-126-3-65℃~+150℃ 1 PNP 100uA 140 200mV 36W 3MHz 45V 4A 5V PNP TO-126-3 Bipolar (BJT) ROHSonsemiBipolar (BJT)BD437
TO-225-3-55℃~+150℃ 1 NPN 100uA 36W 3MHz 45V 4A 5V 800mV 85 NPN TO-225-3 Bipolar (BJT) ROHSonsemiBipolar (BJT)BD433S
TO-126-3100uA 22V 36W 3MHz 40 4A NPN TO-126-3 Bipolar (BJT) ROHSonsemiBipolar (BJT)BD434S
TO-126-3100uA 22V 36W 3MHz 40 4A PNP TO-126-3 Bipolar (BJT) ROHSonsemiBipolar (BJT)