WEE Technology Company Limited

WEE Technology Company Limited 

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

What is the difference between MELF and MiniMELF?

Mini-MELF (SOD-80, DO-213AA,LL-34), smaller size

MELF (DO-213AB), larger size

MELF (Metal Electrode Leadless Face) packages held popularity because of their typically higher operating temperatures, reliability, and accuracy

MELF General Purpose Rectifiers SM4007 Surface Mount Glass Passivated Silicon Rectifier (Voltage Range 50 to 1000 Volts Current 1.0 Ampere)

https://www.weetcl.com/pdf/WEET_Melf_SM4001_THRU_SM4007.PDF

WEE Technology Company Limited 

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

• For surface mounted applications in order to optimize board space

• Low profile package

• Built-in strain relief

• Glass passivated junction

• Low inductance

• Excellent clamping capability

• Repetition rate (duty cycle):0.01%

• Fast response time: typically less than 1.0 ps from 0 volts to BV for unidirectional types

• Typical IR less than 1µA above 10V

• High temperature soldering: 260°C/10 seconds at terminals

• Plastic package has Underwriters Laboratory Flammability Classification 94 V-O

• Case: JEDEC DO214AB. Molded plastic over glass passivated junction

• Terminals: Solder plated, solderable per MIL-STD-750, Method 2026

• Polarity: Color band denoted positive end (cathode)except Bidirectional

WEE Technology Company Limited 

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

WEET Shares With You The Difference Between Frame Structure And Flattened Structure Diodes' Outline 

The biggiest difference is the terminal shape, which is easy to identify.

Frame Structure Diodes' Outline : SMA, SMB,SMC

Flattened Structure Diodes' Outline: SMA-J, SMB-J

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

WEET has two factories. One is focus on diodes, the other is specialized in bridge rectifiers.  Both the two factories are manufacturing GPP chips ourselves. This is the main reason why our price and quality are always favorable and competitive in the market.

Please check below common big size bridge rectifiers list, out output for these itmes are about 300KKpcs per month. Welcome  your enquiry, thank you.

https://www.weetcl.com/Single_Phase_Bridge_Rectifiers/

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

Part No.: P6KE200CA , TVS Diode, P6KE Series, Bidirectional 

Series: P6KE6.8A THRU P6KE600A

Package：DO-204AC (DO-15) 

Description：DIODE TVS 200V 600W 5% UNI Axial

Voltage - Reverse Standoff (Typ)：171V 

Voltage - Breakdown：190V 

Power (Watts)：600W 

Polarization：Unidirectional 

Mounting Type：Through Hole 

Brand: WEET 

Origin: Made in China

Common Items: P6KE6.8CA, P6KE16CA, P6KE30CA, P6KE15CA, P6KE120CA, P6KE200CA, P6KE18CA

The P6KE Series is designed specifically to protect sensitive electronics equipment from voltage transients induced by lightning and other transient voltage events. These devices are ideal for the protection of I/O interfaces, Vcc bus and other vulnerable circuits used in telecom, computer, industrial and consumer electronic applications. ...

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

Seven Main steps required for testing of a diode rectifier are as follows. Suggested by WEET engineer group.

1, Choose a superior quality digital multi-meter, which is very important. Good sensitivity and accuracy counts a lot in testing period.

2, Fix the testing range in the diode position. You need to check both terminal are set in proper position and connected well.

3, On the display you are supposed to easily get a 3 or an infinite voltage reading depending upon the multi-meter used

4, Correctly connect the red probe to the cathode and the black probe to the anode of the rectifier. 

5, The digital multi-meter display will show the low forward voltage drop (rectifier diode) of around 0.6 volts at once

6, Now reverse the connections, the display will return to its original reading, which indicating that the diode is a good condition

7, If the meter displays any other reading, the diode may be leaky or faulty while a 0000 reading means a short circuit.

Need any technical support? Contact with WEET sales team right now, we will find the best solution for you.

https://www.weetcl.com/pdf/WEET_DO27_SF31G_THRU_SF38G.pdf

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

Super Fast Diode 3A (DO-201AD) DO-27 Glass Passivated  SF31G THRU SF38G (SF31G, SF32G, SF33G, SF34G, SF35G, SF36G, SF37G, SF38G) Ultra-Fast Recovery Rectifiers

WEET 400V 3A, Diode, 2-Pin DO-201AD SF36G , competitive with YANGJIE TECHNOLOGY and Taiwan Semiconductor Corporation in price , qaulity and leadtime.

In the same family of these diodes, WEET also provide different packages （DO-15, DO-41, DO-27） and currents from 1A to 5A. Details please refer to below table.

https://www.weetcl.com/Ultra_Fast_Recovery_Rectifiers/DO27_SF31G_THRU_SF38G.html

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

WEE Technology will have four days holiday during the Labor Day from May 1st to May 4th, resume work on May 5th.

We would like to thanks for all the customers support and choose WEET.

Most importantly, we have to say a BIG THANK YOU to our hard-working workers on production line.

Without their devotion, WEE cannot walk so far. We are grateful for them.

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

MAIN FEATURES

• Glass passivated chip junction

• Available in uni-directional and bi-directional

• 1500 W peak pulse power capability with a 10/1000 μs waveform, repetitive rate (duty cycle):0.01 %

• Excellent clamping capability

• Very fast response time

• Low incremental surge resistance

TYPICAL APPLICATIONS

Use in sensitive electronics protection against voltage transients induced by inductive load switching and lighting on ICs, MOSFET, signal lines of sensor units for consumer,computer, industrial, automotive, and telecommunication.