WEE Technology Company Limited

WEE Technology Company Limited
Manufacturer of Surface Mount (SMD) and Through Hole (DIP) Diodes & Rectifiers

Plastic Medium-Power Complementary SiliconTransistors

Designed for general−purpose amplifier and low−speed switching applications.

DARLINGTON5 AMPERE COMPLEMENTARY SILICON POWER TRANSISTORS

Generally are 60−80−100 VOLTS, 65 WATTS

TIP122 is a plastic medium power complementary silicon transistor known for its high current gain (hfe = 1000) and high collector current (IC =5A), and normally used to control loads with high current or in applications where high amplification is required.

Cross reference to TIP122 STMicroelectronics | Discrete Semiconductor 

WEE Technology Company Limited

Manufacturer of Surface Mount (SMD) and Through Hole (DIP) Diodes & Rectifiers

WEET WEE Technology NPN − BC368; PNP − BC369 Amplifier Transistors Features:

Type Designator: BC368. 

Material of Transistor: Si. 

Polarity: NPN. 

Maximum Collector Power Dissipation (Pc): 0.8 W. 

Package: TO-92. 

Lead/Terminal Type: Radial Number Leads/Terminals

Cross Reference: ON SEMICONDUCTOR (FAIRCHILD) BC368 | Transistor: bipolar,NPN; 25V; 1A; 800mW; TO92

Solution application · IT application · Digital application · Automotive application · Circuit protection application · Power application · LED application：

 B772, B772P01, B772P02, BC327, BC328, BC337, BC338, BC368, BC369, BC546 

WEE Technology Company Limited 

Manufacturer of Surface Mount (SMD) and Through Hole (DIP) Diodes & Rectifiers

WEET Small Signal Transistors SOT-23, SOT-323 Marking Code Reference

WEE Technology Company Limited
Manufacturer of Surface Mount (SMD) and Through Hole (DIP) Diodes & Rectifiers

Small signal transistors(BJT) are usually widely used in all segments and for several applications in almost all equipment.

On/ off switches for general use

Bias supply circuits LED diode driver

Infrared diode amplifier

Relay driver

Timer circuits

Audio mute function

High voltage ‘A’ class preamplifier 

RGB coils driver and Scavem circuits

Telecom wireline interface circuits

WEE Technology Company Limited

Manufacturer of Surface Mount (SMD) and Through Hole (DIP) Diodes & Rectifiers

https://www.weetcl.com/Small_Signal_Transistors/WEET_Transistors_SOT-23_MMBT8550.html

WEET MMBT8050 (1.5A). NPN Silicon Epitaxial Planar Transistor for switching and amplifier applications. Especially suitable for AF-driver stages

https://www.weetcl.com/Small_Signal_Transistors/WEET_Transistors_SOT-23_MMBT8050.html

WEET MMBT8550 SOT-23  package SMD Surface Mounted PNP transistor, commonly used in Business, Office & Industrial, Electrical Equipment & Supplies, Electronic Components 

https://www.weetcl.com/Small_Signal_Transistors/WEET_Transistors_SOT-23_MMBT3906.html

WEET MMBT3906 SMALL SIGNAL TRANSISTORS (PNP). Typical FEATURES PNP Silicon Epitaxial Planar Transistor for switching and amplifier applications.

https://www.weetcl.com/Small_Signal_Transistors/WEET_Transistors_SOT-23_MMBT3904.html

WEET MMBT3904 Bipolar (BJT) Transistor NPN 40V 200mA 300MHz 350mW Surface Mount SOT-23 NPN Switching transistor comes in Surface-Mounted Device SMD SOT-23 plastic package. This transistor is designed for use with general purpose applications

WEE Technology Company Limited

Manufacturer of Surface Mount (SMD) and Through Hole (DIP) Diodes & Rectifiers

The small outline transistor (SOT) package family consists of many types of very small and inexpensive surface-mount packages used for discrete components and simple IC's.   

Table 1. Small Outline Transistor (SOT) Package

Table 2. Transistor Outline (TO) Package

WEE Technology Company Limited
Manufacturer of Surface Mount (SMD) and Through Hole (DIP) Diodes & Rectifiers

Who is the best General purpose transistor Manufacturers all over the world?

How to choose a most competitive Bipolar transistor?

Do you have doubts of these kinds of question? Don't worry, WEET is ready to work out a comprehensive transistor factory list for you.

https://www.weetcl.com/Small_Signal_Transistors/

https://www.weetcl.com/Small_Signal_Transistors/WEET_Transistors_SOT-23_BC856_THRU_BC860.html

https://www.weetcl.com/Small_Signal_Transistors/WEET_Transistors_SOT-23_BC846_THRU_BC850.html

https://www.weetcl.com/Small_Signal_Transistors/WEET_Transistors_SOT-23_BC817_BC818.html

https://www.weetcl.com/Small_Signal_Transistors/WEET_Transistors_SOT-23_BC807_BC808.html

WEE Technology Company Limited
Manufacturer of Surface Mount (SMD) and Through Hole (DIP) Diodes & Rectifiers

NPN Silicon Epitaxial Planar Transistor for general purpose applications, SOT-23 Plastic Package

This type of transistor is subdivided into five groups , they are R, O,Y, P and L according to its DC current gain. As complementary type the PNP transistorMMBTSA733 is recommended. 

DC Current Gain at VCE = 6 V, IC = 1 mA 

MMBTSC945R:  40hFE Min and 80hFE Max.

MMBTSC945O: 70hFE Min and 140hFE Max.

MMBTSC945Y: 120hFE Min and 240hFE Max.

MMBTSC945P:200hFE Min and 400hFE Max.

MMBTSC945L 350hFE Min and 700hFE Max.

What's the difference between SOT-23 package and SOT-323 package in SMT (Surface Mounted Transistors)? How does them look the same? How to distinguish them?

the main difference between SOT-23 package and SOT-323 package is the size difference.  If put them together, the main body of SOT-323 is shorter and SOT-23 is longer. Compared with SOT-23, SOT-323 is much smaller; furthermore, the foot spacing of SOT-323 is also different, and SOT-323 is narrower than SOT-23.

To know more about this package, we would like to draw your attention that SOT is a surface mounted package with pins less than or equal to 5 small leads transistors. Such as SOT-23, SOT-323, SOT-523, SOT-223,SOT-23-3 and so on.

Small Outline Transistor (SOT) packages are very small dimensions, usually are plastic-molded packages with more than 3 leads on their two long sides. Due to their low cost and low profile, SOT's are commonly used in consumer electronics. The SOT-23 and the SC-70 packages are two of the most widely used SOT packages nowadays.

In electronics, packaging not only plays the role of installing, fixing, sealing, protecting chips and enhancing the electrothermal performance, but also connects the contacts on the chips to the pins of the package shell by wires. These pins are connected with other devices through wires on the printed circuit board, thus realizing the connection between the internal chip and the external circuit. Because the chip must be isolated from the outside world to prevent the corrosion of the chip circuit caused by impurities in the air, resulting in the decline of electrical performance. On the other hand, the encapsulated chip is more convenient to install and transport.

https://www.weetcl.com/Small_Signal_Transistors/WEET_Transistors_SOT-23_MMBTSC945.html

https://www.weetcl.com/pdf/WEET_Transistors_SOT-23_MMBTSC945.pdf

WEE Technology Company Limited
Manufacturer of Surface Mount (SMD) and Through Hole (DIP) Diodes & Rectifiers

BC846, BC847, BC848, BC849, BC850, BC856, BC857, BC858, BC859, BC860  Series General Purpose Transistors NPN Silicon http://weetcl.com

These transistors are designed for general purpose amplifier applications. They are housed in the TO-236/SOT-323 which is COLLECTOR designed for low power surface mount SMD applications. 

WEET NPN/PNP Epitaxial Silicon Transistor Mainly Features:

BC856 THRU BC860, BC846 THRU BC850 Series types are NPN Silicon Transistors manufactured by the epitaxial planar process, epoxy molded in a SUPERminiTM surface mount package, designed for general purpose switching and amplifier applications.

https://www.weetcl.com/pdf/WEET_Transistors_SOT-23_BC846_THRU_BC850.pdf

WEE Technology PNP Silicon Epitaxial Planar Transistors SOT-23(TO-236) Small Transistors (BC846A, BC846B, BC846C, BC847A, BC847B, BC847C, BC848A, BC848B, BC848C, BC849A, BC849B, BC849C, BC850A, BC850B, BC850C)

https://www.weetcl.com/pdf/WEET_Transistors_SOT-23_BC856_THRU_BC860.pdf

WEE Technology PNP Silicon Epitaxial Planar Transistors SOT-23(TO-236) Small Transistors (BC856A, BC856B, BC856C, BC857A, BC857B, BC857C, BC858A, BC858B, BC858C, BC859A, BC859B, BC859C, BC860A, BC860B, BC860C)

https://www.weetcl.com/pdf/WEET_Transistors_SOT-23_Pacakge_Outline.pdf

WEE Technology Company Limited
Manufacturer of Surface Mount (SMD) and Through Hole (DIP) Diodes & Rectifiers

Do you know what is the meaning by 5C or 6B on a BJT transitors? WEET is going to tell you how to distinguish them correctly. What is the meaning for transistors marking code?

SOT-23 is commonly known for a 3 pins SMD package and is also known as SOT23-2 or TO-236. There is also 5 pins package (SOT-235) and 6 pins package (SOT-236)

The SOT package is small and normally the full part number cannot be printed on the chip itself, normally the part number is represented by a marking code printed on the top of the SOT23 package

The following presents some of the SOT23 components marking code, which is useful for reverse engineering use.

WEET suggest you to double check the datasheet to confirm if your marking code matches the part number

WEE Technology Company Limited

Manufacturer of Surface Mount (SMD) and Through Hole (DIP) Diodes & Rectifiers

WEE Technology PNP Silicon Epitaxial Planar Transistors SOT-23(TO-236) Small Transistors:

BC807-16, BC807-25, BC807-40, BC808-16, BC808-25, BC808-40

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

WEE Technology Company Limited

Manufacturer of Surface Mount (SMD) and Through Hole (DIP) Diodes & Rectifiers

BC817 NPN general-purpose transistor in a small SOT23 (TO-236) Surface-Mounted Device (SMD) plastic package, but with high collect current and high DC current gain. SMD General Purpose Transistor (NPN) 45 V, 500 mA usually used for switching and AF Amplifier Applications 

BC817-40LT1G also known as Bipolar Transistors - BJT, BC817-16 marking as 6A, BC817-25 marking as 6B, BC817-40 marking as 6C.

So how to recognize the marking code for SMD General Purpose Transistors? WEET engineers would like to share more with you.

The European used to name transistors begins with A or B (A denotes germanium tube and B denotes silicon tube). 

The second part uses C, D or F, L (C-low frequency small power tube, F-high frequency small power tube, D-low frequency high power tube, L-high frequency high power tube); 

S and U usually stands for small power switching and high power switching transistors respectively; 

The third part uses three digits to denote each serial number or part number.

For example, BC817 represents a silicon low-frequency low-power transistor (fT = 200MHz) and a universal small-signal amplifier transistor. 

There are also some transistors models named by the manufacturer itself (factory standard), which are not standard in the market. 

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

WEE Technology Company Limited
Manufacturer of Surface Mount (SMD) and Through Hole (DIP) Diodes & Rectifiers

WEET has rich experience in producing small signal transistor for switching and amplifier applications.

MMBT9012G, MMBT9012H

Collector Base Breakdown Voltage 40V

Collector Emitter Breakdown Voltage 30V

Emitter Base Breakdown Voltage 5V

Power Dissipation 200W

MMBT9013G, MMBT9013H

Collector Base Breakdown Voltage 40V

Collector Emitter Breakdown Voltage 30V

Emitter Base Breakdown Voltage 5V

Power Dissipation 200W

MMBT9014B, MMBT9014C, MMBT9014D

Collector Base Breakdown Voltage 50V

Collector Emitter Breakdown Voltage 45V

Emitter Base Breakdown Voltage 5V

Power Dissipation 200W

WEE Technology Company Limited
Manufacturer of Surface Mount (SMD) and Through Hole (DIP) Diodes & Rectifiers

Small Signal Transistors

PNP Silicon Epitaxial Planar Transistors BC807
NPN Silicon Epitaxial Planar Transistors BC817
NPN Silicon Epitaxial Transistors BC846-BC850
PNP Silicon Epitaxial Transistors BC856-BC859
NPN Silicon General Transistors MMBT3904
PNP Silicon General Transistors MMBT3906
NPN Silicon Epitaxial Planar Transistors MMBT8050
PNP Silicon Epitaxial Planar Transistors MMBT8550
PNP Silicon Epitaxial Planar Transistors MMBT9012
NPN Silicon Epitaxial Planar Transistors MMBT9013
NPN Silicon Epitaxial Planar Transistors MMBT9014
NPN Silicon Epitaxial Planar Transistors MMBT9018
NPN Silicon Epitaxial Planar Transistors MMBTSC945