WEE Technology Company Limited 

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

WEET Square 3 Phase Bridge Rectifiers (Single Phase Square Type)Zinc Shell KBPC and Plastic Shell GBPC Difference.

WEET Bridge Rectifiers devices are provided in a variety of packages including SMD, Dual In-Line, Single In-Line, Square Type, Round Type, and 3 Phase Bridge Rectifiers.

https://www.weetcl.com/Single_Phase_Bridge_Rectifiers/WEET_KBPC35005_THUR_KBPC3510.html

https://www.weetcl.com/Single_Phase_Bridge_Rectifiers/WEET_GBPC35005W_THUR_GBPC3510W.html

GBPC3510-New package aluminum bottom plastic Shell - More stable and reliable

GBPC3510 uses a new aluminum bottom plastic case package. This new package is very different from the metal zinc case used by KBPC3510, which has better heat dissipation and stability. Customers who have used metal zinc shell packages will feel this way. The heat dissipation is relatively not prominent. The large amount of thermal energy accumulated in the long-term operation of the internal chip cannot be effectively exported, which directly affects the reliability of the bridge stack. The GBPC3510 is packaged in a new aluminum bottom plastic case. Aluminum has a high conduction efficiency and can conduct heat quickly, which greatly improves the reliability of the power supply.

GBPC5010 adopts aluminum bottom plastic Shell - Better protect chip and more secure

We know that GBPC3510 is a semiconductor power device, and the chip will heat up when it is working. Because the chip is wrapped with epoxy resin, the resin will expand slightly when the chip heats up, and when the rectifier bridge stops working, the resin will shrink slightly. Because the thermal equilibrium point of metal zinc and epoxy resin is not consistent, if the resin and the shell are not synchronized when the heat rises and contracts, it will cause a hard strain on the chip. Although this hard change is not great for the entire rectifier bridge, it is enough for the built-in chip to damage the chip. The GBPC3510 special design will be able to prevent the risk of wonderful chip is hard force injury, it can be more good to protect the chip from being damaged.

GBPC3510 with aluminum bottom plastic Shell - Thinner Volume

GBPC3510 uses the GPP passivation process for gold-plating large chips. The GPP passivation process is also called the glass passivation process. It is a layer of glass protection on the surface of the chip, which can better prevent chip oxidation and improve chip stability. The highlight is that it can reduce the thickness of the chip, which is in sharp contrast to the thick white glue wrapped with traditional pickled chips. Therefore, using a thinner GPP chip can make the GBPC3510 have a thinner volume.

Advantages and disadvantages of square rectifier bridge zinc shell and aluminum bottom plastic shell:

The galvanized shell rectifier bridge has a metal zinc envelope inside and a potted black plastic seal inside. The square bridge with this packaging method has lower cost and can be well applied in some places where the temperature rise is not high. However, the heat dissipation performance of this kind of bridge stack is not as good as the bridge stack of aluminum bottom plastic shell. On the contrary, the bridge stack of aluminum bottom plastic shell has a cooling aluminum plate under the square bridge stack, which can greatly improve the heat dissipation performance of the bridge stack. But relatively speaking, its cost will be higher, and the cost issue will be considered in our actual application.

WEE Technology Company Limited 

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

Important parameters of TVs

A major challenge in automotive design is to protect automotive electronic equipment (such as control units, sensors and entertainment systems) from damaging surges, voltage transients, ESD and power line noise. The use of transient voltage suppressor (TVS) is an ideal solution to protect automotive electronic equipment. Next, we will discuss the key parameters of TVs devices - power level, off state voltage and maximum breakdown voltage.

Power level

The power level of TVs is the surge absorption capacity under specific test or application conditions. Vishay's TVs products use industry standard 10 / 1000 μ s pulse waveform

(Bellcore 1089 standard) as the test condition, as shown in Figure 1. This test condition is different from the 8 / 20 μ s pulse waveform of TVs ESD test

Breakdown voltage (VBR)

The breakdown voltage is the voltage at which the device enters the avalanche breakdown, which is tested according to the current specified in the data sheet.

Maximum breakdown voltage (VC: clamping voltage)

Clamping voltage level that appears on TVs at the specified peak pulse current level. The breakdown voltage of TVs is measured at very low current, such as 1 mA or 10 Ma, which is different from the actual avalanche voltage in application conditions. Therefore, semiconductor manufacturers will indicate typical or maximum breakdown voltage under high current conditions.

Off state voltage (VWM: working off state reverse voltage)

Off state voltage refers to the maximum voltage when TVs is not broken down. It is an important parameter of protection device which does not work under normal conditions. In automotive applications, the regulation of some automotive electronic products is realized by "step protection". This test condition is to supply 24 VDC to 12 V electronic equipment and 36 VDC to 24 V electronic equipment within 10 minutes without causing damage or circuit failure. Therefore, for automotive electronic products, off state voltage is a key parameter of TVs devices.

WEE Technology Company Limited 

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

TVS (Transient Voltage Suppressors) diodes, that is, transient voltage suppressors, also known as avalanche breakdown diodes, are single PN junction or multiple PN junction integrated devices made by semiconductor processes. There are unidirectional and bidirectional TVS diodes. Unidirectional TVS diodes are generally used in DC power supply circuits, and bidirectional TVS diodes are used in voltage alternating circuits. When applied to a DC circuit, a unidirectional TVS diode is connected in reverse in parallel to the circuit. When the circuit works normally, the TVS diode is in the off state (high-impedance state), which does not affect the normal operation of the circuit. When the circuit has an abnormal overvoltage and reaches the TVS diode breakdown voltage, the TVS diode quickly changes from a high-resistance state to a low-resistance state, releasing the transient overcurrent caused by the abnormal overvoltage to the ground, and clamping the abnormal overvoltage to Low level, thus protecting the post-stage circuit from abnormal overvoltage. When the abnormal overvoltage disappears, the resistance of the TVS diode returns to a high-impedance state.

First, TVS diode products supplied by WEET can be classified from the package types:

• SMA/DO-214AC：P4SMA6.8CA THRU P4SMA250CA, SMAJ5.0CA THRU SMAJ440CA

• SMB/DO-214AA：P6SMB6.8CA THRU P6SMB250CA, SMBJ5.0CA THRU SMBJ440CA

• SMC/DO-214AB：SMDJ5.0CA THRU SMDJ170CA, SMCJ5.0CA THRU SMCJ440CA

• SOD-123FL：SMF5.0CA THRU SMF220CA

• DO-41：P4KE6.8CA THRU P4KE440CA

• DO-15：P6KE6.8CA THRU P6KE600CA

• DO-27：1.5KE6.8CA THRU 1.5KE440CA

Second Part: What do TVS diode characteristics stand for ?

• Made of semiconductor technology, with high reliability and no damage limit;

• Glass passivation process, accurate on-voltage;

• Large transient power, low capacitance, low leakage current, easy to control clamping voltage;

• Fast response time: usually less than 1.0PS;

• Excellent clamping ability and small breakdown voltage deviation;

• High voltage accuracy, in special applications, higher accuracy can be achieved through process or parameter screening;

• Small size and easy installation;

• unidirectional and bidirectional units;

• Transient power can reach 200W-30000W or even higher under 10 / 1000μs waveform;

• Working voltage range 3.3V ~ 600V, or even higher;

• Diversified package formats

SMD package: SOD-123, SMA / DO-214AC, SMB / DO-214AA, SMC / DO-214AB, DO-218AB, etc.

In-line package: DO-41, DO-15, DO-201,  etc .;

• Halogen-free and RoHS compliant;

Third Part: How to understand TVS diode selection guide?

1) To determine the maximum DC or continuous operating voltage in the protected circuit, the rated standard voltage of the circuit and the "high-end" tolerance;

2) The rated transient power of the TVS tube is greater than the maximum transient surge power that may occur in the circuit;

3) The cut-off voltage of the TVS tube must be greater than the highest working voltage of the circuit being protected;

4) The maximum clamping voltage of the TVS tube should be less than the damage voltage in the protected circuit of the subsequent stage;

5) After determining the maximum clamping voltage of the TVS tube, its peak pulse current should be greater than the transient surge current;

6) For the circuit protection of the data interface, you should also pay attention to the selection of TVS diodes with appropriate capacitance. For example: when the signal frequency or transmission rate is high, a TVS tube with a low capacitance series should be selected;

Fourth Part:  WEET shares the detailed explanation of TVS diode parameters

• VRWM: cut-off voltage, the highest working voltage of TVS diode, the maximum DC voltage or AC peak voltage that can be continuously applied without causing degradation or damage of TVS diode Under VRWM, TVS diodes are not working and are not conducting.

• VC: Clamping voltage. The peak voltage measured across the TVS diode when the peak pulse current IPP of the specified waveform is applied.

• VBR: Breakdown voltage, which is the minimum avalanche voltage of a TVS tube. It refers to the voltage across the TVS measured on the V-I characteristic curve under the specified pulsed DC current IT or the current near the occurrence of avalanche.

• IR: Leakage current, also known as standby current. The maximum current flowing through a TVS diode at a specified temperature and maximum operating voltage is measured at the cutoff voltage.

• IPP: peak pulse current, generally the peak value under 10 / 100μs current waveform.

• IT: Test current.

• C: Capacitance value. For TVS tubes of the same power level, the lower the voltage, the larger the capacitance value. In the protection of communication lines, pay special attention to the capacitance value of the TVS tube.

• Package form: From the package form of the TVS tube, its power can be seen. The chip area of a TVS tube directly determines its power level.

Fifth Part:  How to choose TVS and TVS diode selection precautions

1) The specification manual only gives the absorbed power peak at a specific pulse width, and the pulse width in the actual circuit is variable. There must be a number in the heart, and the wide pulse should be derated.

2) For the protection of small current load circuits, it is necessary to intentionally increase the current limiting resistance;

3) Pay attention to whether the steady-state average power of the TVS diode is within the safe range;

4) Consider temperature changes. Normally, transient suppression diodes work between -55 ° C and 150 ° C. Derating should be applied when the temperature in the circuit is relatively high.

5) The lead length of TVS transient suppression diode should be opposite to the line to be protected.

6) For the protection in the data interface or communication line, TVS diodes with relatively small capacitance values should be selected as much as possible.

7) Most of the DC protection circuits are unidirectional TVS tubes, the AC protection circuits are mostly bidirectional TVS tubes, the multi-channel protection circuits are TVS array devices, and the high-power protection circuits are special protection modules.

8) In the process of using TVS tube, considering the dispersion of TVS, try to reduce the number of serial / parallel.

Sixth Part:  What is TVS diode typical application 

TVS diodes have the advantages of extremely fast response speed, low clamping voltage, precise voltage, etc., so they are used in the field where the protection device is required to be relatively high. Automotive electronics, home, industrial control, lighting, communication, medical and other industries, such as DC power line, RS485 interface, communication power, I / O port, etc.

WEE Technology Company Limited

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

SMB 600W SMBJ Series SMBJ5.0CA THRU SMBJ440CA Transient Voltage Suppressor WEET TVS

WEET SMB 600W SMBJ Series Transient Voltage Suppressor TVS Chinese Factory Compete With Overseas Brands with no shame. 

WEET have superior quality and competitve price. We are moving ahead to 2020 and look foward to more business shars in the overseas market.

https://m.littelfuse.com/~/media/electronics/datasheets/tvs_diodes/littelfuse_tvs_diode_smbj_datasheet.pdf.pdf

https://www.st.com/en/protection-devices/smbj.html

https://www.bourns.com/docs/Product-Datasheets/SMBJ.pdf

https://www.littelfuse.de/products/tvs-diodes/surface-mount/smbj/smbj33ca.aspx

https://rectron.com/public/product_datasheets/smbj.pdf

https://www.diodes.com/assets/product-showcases/Automotive-Grade-SMAJ-SMBJ-SMCJ-3.0SMCJ-TVS-Diodes-NPA-112018.pdf

http://www.avx.com/products/diodes/tvs/smb-package/

https://www.weetcl.com/Transient_Voltage_Suppressors_TVS/SMB_SMBJ_Series.html

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

WEE Technology Company Limited

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

WEET SMC 3000W SMDJ Series SMDJ5.0CA THRU SMDJ170CA Transient Voltage Suppressor TVS.

As one of the famous TVS Diodes Manufacturer in China, we are proud to indtroduce our SMDJ sereis to you.

https://www.weetcl.com/Transient_Voltage_Suppressors_TVS/SMC_SMDJ_Series.html

https://www.weetcl.com/pdf/WEET_SMC_SMDJ5.0CA_SMDJ170CA-Series.pdf

WEE Technology Company Limited

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

WEET SMC 1500W SMCJ Series SMCJ5.0CA THRU SMCJ440CA Transient Voltage Suppressor TVS factory in China for more than 20 years.  

WEET Chinease Made SMCJ series is designed expecially to protect sensitive electronic equipment from high voltage transients induced by lightning and other transient voltage events during the usage.

TVS 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.

Transient Voltage Suppression Diodes Surface Mount – 1500W SMCJ series has Uni-directional and Bi-directional two types for choose.

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

https://www.weetcl.com/Transient_Voltage_Suppressors_TVS/SMC_SMCJ_Series.html

WEE Technology Company Limited

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

WEET N Channel Power MOSFET 2A to 20A 600V to 800V, common package TO-251, TO-252, TO-220, TO-220F, strong list as below.

Welcome your enquiry. Free samples are ready for you.

WEE Technology Company Limited

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

WEET Comprehensive Bridge Rectifier Packages DB,DBS, ABS, MB, MBS, MBF, MBM, WOB, which with 0.5A, 0.8A, 1A current.

Voltage from 50V to 1000V. The best seller is MB6S, AB210S. All of our bridge rectifiers are with GPP chips. Try WEET, you earn.

WEET Other Strong Bridge Rectifiers

WEE Technology Company Limited

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

WEET has rich expenceince in manufatctuirng axial lead didoes for more than 20 years. All the products are with self-developed GPP chip, which gives us priority in price level. We also have confindence about quality, as we introduced Taiwan and Jepanses automation machines.

Please kindly refer to below hot and common products list, half- finished products in warehouse. 2 weeks lead time.

WEE Technology Company Limited

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

WEET is grateful for all of our cusotmers in the past decades supports and care. Right now, we are promotoin our strong diodes and rectifiers.

Special price will be applied based on large volume before Thanksgiving Day. This is  a way WEET show our sincerity . Don't miss the chance.

WEE Technology Company Limited 

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

In most electronics circuits, when you choose a diode and consider about the package, bigger size is more stable than smaller size , as the chip size decides the performance of each electronic components. In other words, the bigger size package diodes can replace other smaller one. At the same time, you have to check your PCB design as well if you are going to change your products.Match is the most important thing.

Secondly you need to calculate your project budget. There is no doubt that bigger size refers to higher cost. The most expensive package in SMD diodes is SMC package. On the contrast, SMA-J, SMAF, SOD-123FL are those thinner and  relatively economical packages.

So how to choose a most suitable diodes for your products? No worry. Please contact with WEE Diodes, we are ready to provide our assistance and offer the best diodes and rectifiers to you at the competitive price and outstanding performance.

Well, WEE Technology Company Limited is specialized in manufacturing diodes and bridge rectifiers. A-405, DO-15, DO-27, DO-35, DO-41, LL-34, LL-41, R-1, R-6, SMA, SMAF, SMAJ, SMB, SMC, SOD123, SOD-123FL, SOD-323, SOT-23, TO-220, TO-263, TO-277, MBS, MBF LBS, ABS, MBM, DB, DBS, WOM, MBM, KBP, GBP, KBL, KBU, GBU, KBJ4(3S), KBJ6(5S), BR6, KBPC6, KBPC8, KBPC/KBPC-W, BR/BR-W, BR-L, KBPC3(BR-3), GBPC, GBPCW, S35, S36, D4K

https://www.weetcl.com/Package_Info/

WEE Technology Company Limited 

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

WEE Technology Silicon epitaxial planar diode / fast switching diodes are AEC-Q101 qualified available

1N4148 is a small high-speed switching diode. The switch is relatively fast. It is widely used in circuit with high signal frequency for one-way conduction isolation, communication, computer board, TV circuit and industrial control circuit.

1N4148 is a very versatile high-frequency switching diode. Including DO35, LL34, SOD323, SOT23, 0805 packages.

WEET 1N4148 fast switching diodes

Pacakge：DO-34, DO-35 

WEET LL4148 Diode type small signal

Pacakge：MiniMELF SOD80

WEET 1N4148W Silicon Epitaxial Planar Switching Diode 

Pacakge：SOD-123

WEET 1N4148WS Silicon Epitaxial Planar Switching Diode 

Pacakge：SOD-323

WEET 1N4148WT Silicon Epitaxial Planar Switching Diode 

Pacakge：SOD-523

WEE Technology Company Limited

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

1N indicates that the device has a 1 PN junction. Similarly, American type diodes all start at 2N because they have two PN junctions. 

Usually this product starts with several PN series and is developed in the United States. 4148 is just something like a serial number, and its number has no practical significance. LL4148 is a SMD version of 1N4148, Don't know exactly what LL means.

LL4148 usually refers to the glass-sealed cylinder LL-34 package (SMD Type, pinless).

1N4148 usually refers to DO-35 glass seal, axial pin, plug-in. It can be taped or packed in bulk.

1N4148 is a small high speed switching diode. The switch is relatively fast. It is widely used in circuit with high signal frequency for one-way conduction isolation, communication, computer board, TV circuit and industrial control circuit.

All of them are fast switching diodes, but they are packaged differently in order to suit for various PCB soldering patterns.

1N4148 is DO-35 plug-in through hole package, LL4148 is miniMELF chip SMD package, the two can be completely used alternately under low operating current.

WEE Technology Company Limited 

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

Zener Diodes BZV55C2V4 - BZV55C75V LL-34(Glass Case MiniMELF), Power Disspation 0.5W, forward voltage at 1F = 100mA 0.9V

Silicon Epitaxial Planar Zener Diodes ZMM1-ZMM75 LL-34(Glass Case MiniMELF), Power Disspation 0.5W, forward voltage at 1F = 100mA 1.0V

Silicon Planar Power Zener Diodes ZM4728-ZM4761,LL-41(Glass Case MELF), Power Disspation 1W, forward voltage at 1F = 200mA 1.2V

What is the difference between LL-34 and LL-41 package, please see below size table for reference, please check WEET datasheet before ordering

WEE Technology Company Limited 

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

1W 3V to 75V ±5% ( DO-204AL) DO-41 2-Pin Glass through-hole body style Package Silicon Epitaxial Planar Switching Diode 1N4727A - 1N4761A

For use in stabilizing and clipping circuits with high power rating

WEE Technology Company Limited 

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

MELF(LL-41 / DO-213AB),  5,000pcs/Reel , Reel Ø. 330 mm. 

MiniMELF(LL-34 / DO-213AA),  2,500/Reel / 10,000/Reel ,  Reel Ø. 178 mm / 330 mm. 

QuadroMELF(LS-34),  2,500/Reel / 10,000/Reel ,  Reel Ø. 178 mm / 330 mm. 

MicroMELF(LS-31),  2,500/Reel / 10,000/Reel ,  Reel Ø. 178 mm / 330 mm. 

WEE Technology Company Limited 

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

WEET High Speed SMD Switching Diode 1N4148W, 1N4148WS, 1N4148WT

These diodes are also available in other case style including the DO-35 case with type designation 1N4148, the Mini MELF case with the type designation LL4148 and the Micro MELF case with the type designation MCL4148.

WEET strong small Diodes Pakcage: DO-35/LL-34/SOD-123/SOD-323/SOD-523/SOT-23

Marking W2 / T4 for SMD Diode 1N4148WS, Marking W1 for SMD Diode 1N4148W, Marking .A for SMD Diode 1N4148WT

For 1N4148W our database currently has 3224 SMD marking codes of bipolar transistors (BJT),

WEE Technology Company Limited 

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

WEET 1N4148, LL4148 and Zener Diodes BZV55C Packing:

1N4148 usually refers to DO-35 glass seal, axial pin, through hole type. It can be taped in ammo or packed in bulk.

LL4148 and BZV55C are surface mount SMD type, only available in tape and reel packing. 7 inch and 13 inch paper or plastic tape for choose.

WEET 1N4148, LL4148 and Zener Diodes BZV55C Package:

LL4148 usually refers to the glass-sealed cylinder LL-34 package (patch, pinless). 

LL4148 is a surface mount SMD type, as well las BZV55C. But BZV55C with blue ink indentification and LL4148 with black ink indentification

WEET 1N4148, LL4148 and Zener Diodes BZV55C Marking:

1N4148 usally will mark the part number on the glass surface, but LL4148 and Zener Diodes BZV55C does not.

WEET 1N4148, LL4148 and Zener Diodes BZV55C Total power dissipation: Max.500mW

BZV55C Two tolerance series: ± 2% and approx. ± 5% 

Standard tolerance approx. ±5% (refer to "zener voltage range") ; ±2% tolerance available on request.

https://www.weetcl.com/High_Speed_Switching_Diodes/DO35_1N4148.html

https://www.weetcl.com/High_Speed_Switching_Diodes/LL34_LL4148.html

https://www.weetcl.com/Silicon_Planar_Zener_Diodes/LL34_BZV55C2V4_THRU_BZV55C75.html

WEE Technology Company Limited

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

WEET 500mW LL4148 Diode Description

A diode is a device which allows current flow through only one direction. That is the current should always flow from the anode to the cathode. LL4148 is a Silicon Epitaxial planar diode with an identification of cathode band(which is easy to indentify by the blacking ring mark from the filler in the glass package), comes in glass package version. It has high conductance and high reliability. The specialty of this diode is its fast recovery time of 8ns to 4ns only at a forward current of 300mA, hence this diode is used in places where extremely fast switching is involved. The main use of this diode is for extreme fast switches. LL4148 is used in various projects like heat monitoring, detecting the state of LED to control another circuit and many other electronic circuits

WEET Fast Switching Speed Diode LL4148 Features

Glass package version for high reliability

Available in both Through-hole and Surface mount versions

Conductance is also high

Silicon epitaxial planar diode

RoHS and REACH compliant

Electrical data identical with the devices 1N4148 and 1N4448 respectively

MiniMELF SOD-80 LL-34 Glass Case 

Anode,Current always Enters through Anode

Cathode,Current always Exits through Cathode

The black is the color ring, the main ingredients are  ink

The red one is Dumex, a kind of alloy material.

WEET Samll Signal Fast Switching Diode 500mW LL4148 Applications

Extreme fast switches

Can be used to prevent reverse polarity problem

Protect Power electronic switches that are operating with high switching frequency.

Used as a protection device

Current flow regulators

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

WEE Technology is strong at all kinds of bridge rectifiers. Below are two of our strong types, welcome your enquiry. We are ready to cost down for you. WEE has specialized in producing bridge rectifiers for more than 20 years, usually we will use large chip than most of Chinese factories to make sure the top quality of the products. All of our bridge rectifiers are UL qualified, RoSH and Reach compliant.