WEET BC817 NPN and BC807 PNP Small Signal Bipolar BJT Transistors SOT-23 TO-236

BC817 serie NPN and BC807 serie PNP are complementary types:

SOT-23(TO-236) BC817 THRU BC818 (BC817-16, BC817-25, BC817-40, BC818-16, BC818-25, BC818-40) NPN Small Signal Bipolar (BJT) Transistors

Datasheet: https://weetcl.com/pdf/WEET_Transistors_SOT-23_BC817_BC818.pdf

SOT-23(TO-236) BC807 THRU BC808 (BC807-16, BC807-25, BC807-40, BC808-16, BC808-25, BC808-40) PNP Silicon Small (BJT) Transistors

Datasheet: https://weetcl.com/pdf/WEET_Transistors_SOT-23_BC807_BC808.pdf

Applications: switching, AF driver and amplifier  

The difference between PNP and NPN, they have different compositions: 

PNP type transistor is a transistor composed of two P-type semiconductors sandwiched between one N-type semiconductor; 

NPN type transistor is composed of three semiconductors, including two N-type and one P-type semiconductors, with the P-type semiconductor in the middle and two N-type semiconductors on both sides.

The working principle of PNP and NPN is the same, that is, a transistor is a control element mainly used to control the size of the current. 

Taking the common emitter connection method as an example, when there is a small change in the base voltage UB, the base current IB will also have a small change. Under the control of the base current IB, the collector current IC will have a large change, and the larger the base current IB, the larger the collector current IC; On the contrary, the smaller the base current, the smaller the collector current, that is, the base current controls the change in collector current. But the change in collector current is much greater than the change in base current, which is the amplification effect of the transistor. The ratio of the change in IC to the change in IB is called the amplification factor of the transistor β, The amplification factor of the transistor β Usually in the tens to hundreds of times.


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WEET Chinese Spring Festival Holiday Feb.1st to 18th Resumes Work on Feb. 19th

Dear Customers,

We would like to say thank you for your support in 2023, let's look forward to the new year of 2024.

Please kindly be noted of our holiday notice as below, thank you.

Shut down (during CNY):1st Feb to 18th Feb, 2024

Resume work  (after CNY): 19th Feb, 2024

Last shipment (before CNY): 22th Jan, 2024

First shipment (after CNY):  26th  Feb, 2024

Wishing you a prosperous and successful New Year filled with new opportunities and business growth.

Work together with WEET and win more in 2024, thank you.


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