

Overview
The STR1550 is a bipolar made by STMicroelectronics in a SOT-23-3 package with 3 pins. -65℃~+150℃ 1 NPN 100 10uA 12V 200mV 500V 500mA 500mW NPN SOT-23-3 Bipolar (BJT) ROHS.
PCBKit's library has its KiCad symbol (Pinmap_Generic:Q_NPN_1B_2E_3C, from PCBKit's generic symbols) and its footprint (Package_TO_SOT_SMD:SOT-23-3, from KiCad's library), ready for a KiCad board. 2,720 are in stock at JLCPCB (part C907714). 1 open-source board in 1 repository on GitHub use it.
Symbol
Footprint
Parameters
10- Collector - Emitter Voltage VCEO
- 500V
- Current - Collector Cutoff
- 10uA
- Current - Collector(Ic)
- 500mA
- DC Current Gain
- 100
- Emitter-Base Voltage(Vebo)
- 12V
- Number
- 1 NPN
- Operating Temperature
- -65℃~+150℃
- Pd - Power Dissipation
- 500mW
- Vce Saturation(VCE(sat))
- 200mV
- type
- NPN
Order codes
1- STR1550LCSC C907714
Pinout
3| Pin | Name | Type |
|---|---|---|
| 1 | B | Input |
| 2 | E | Passive |
| 3 | C | Passive |
Open-source boards using it
All 1- 4 layers68 × 100 mm

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Is there a KiCad symbol and footprint for the STR1550?
Yes. The symbol is Pinmap_Generic:Q_NPN_1B_2E_3C and the footprint Package_TO_SOT_SMD:SOT-23-3, both drawn on this page. PCBKit places them on a board for you when you design with it.
What package is the STR1550?
SOT-23-3, with 3 pins. Its footprint is drawn on this page.
Where is the STR1550 datasheet?
STMicroelectronics publishes it: the Datasheet link on this page opens it.
Where can I order the STR1550?
JLCPCB lists it as part C907714, with 2,720 in stock; the sellers' links on this page open their listings.
What can replace the STR1550?
Parts like it in the library: the ZXTP25020CFHTA by Diodes Incorporated, the KTC3551T-RTK/PW by KEC Semicon, the FMMT591QTA by Diodes Incorporated and the FMMT717QTA by Diodes Incorporated. Check their datasheets: a part that fits the footprint may still differ in its ratings.
Which open-source boards use the STR1550?
1 board in 1 repository on GitHub; the most starred are listed on this page, with their KiCad files.
Parts like it
8ZXTP25020CFHTA
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