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WEET PNP Silicon General Transistors SOT-23 BC857A BC857B BC857C BC858A BC858B BC858C BC859A BC859B BC859C
Spec.: https://weetcl.com/pdf/WEET_Transistors_SOT-23_BC856_THRU_BC860.pdf 

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WEET NPN Silicon Epitaxial Planar Transistors SOT-23 BC848A BC848B BC848C BC849A BC849B BC849C
Spec.: https://weetcl.com/pdf/WEET_Transistors_SOT-23_BC846_THRU_BC850.pdf
Transistors Package Type:       
TO-3               TO-3 is a transistor outline (TO) package.        
TO-8               TO-8 is a transistor outline (TO) package.       
TO-39             TO-39 is a transistor outline (TO) package.       
TO-92             TO-92 is a single in-line, transistor outline (TO) package that is often used for low power devices. One of the oldest power packages, TO-92 is suitable for applications in office and communication equipment.        
TO-202           TO-202 is a transistor outline (TO) package.        
TO-220           TO-220 is a transistor outline (TO) package that is suitable for high-power, medium-current, and fast-switching power devices. TO-220 is used in home appliances, office and industrial equipment, and personal and consumer electronics. A package variant, TO-220 Full Pack, includes a fully encapsulated heat sink that does not require extra hardware for electrical isolation. TO-220 Full Pack has the same footprint as TO-220, provides electrical isolation up to 5 KV, and is often used in motor drive applications and power supplies.       
TO-223          TO-223 is a transistor outline (TO) package.        
TO-237          TO-237 is a transistor outline (TO) package.        
TO-247          TO-247 is a large, throughhole, transistor outline (TO) package. TO-247 provides excellent power dissipation and is ideal for metal oxide semiconductor field effect transistors (MOSFETs), high power bipolar transistors, and insulated gate bipolar transistors (IGBTs).       
TO-263          TO-263 is the surface-mount version of the TO-220 package. TO-263 is a transistor outline (TO) package with 2, 3, 5, 6, or 7 leads. TO-263 can accommodate large dice because of its large pad design. It is suitable for high-power applications due to its low resistance. Typical applications for TO-263 include home appliances and personal computers.      
SO-8               SO-8 is a small outline (SO) package.        
SOT3               SOT3 is a small outline transistor (SOT) package with three leads.        
SOT23             SOT23 is a rectangular, surface-mounted, small outline transistor (SOT) package with three or more gull wing leads. SOT23 features a very small footprint and is optimized for the highest possible current. Because of its low cost and low profile, SOT23 is used in home appliances, office and industrial equipment, personal computers, printers, and communication equipment.        
SOT25              SOT25 is a surface-mounted, small outline transistor (SOT) package with three leads.         
SOT26              SOT26 is a plastic, surface-mounted, small outline transistor (SOT) package with three leads.        
SOT82              SOT82 is a rectangular, surface-mounted, small outline transistor (SOT) package with three leads. SOT82 is larger than DPAK and smaller than TO-220, but still comparable to TO-220 in performance. SOT82 lead frames are available in full nickel or selective silver plating and allow wire bonding with gold or aluminum wire. Often, SOT82 is used in over-voltage protection devices in telecommunications equipment. SOT82 is also used to package high-power rectifiers, DC to AC converters (DACs) and frequency converters.        
SOT89               SOT89 is a plastic, surface-mounted, small outline transistor (SOT) package with three leads and a collector pad for good heat transfer. Unlike other packages, SOT89 lead posts are up-set and not down-set. SOT89 is designed for medium power and high-speed switching applications. It is also used in applications that feature very low RDS (on), no secondary breakdown, and direct interface to complementary metal oxide semiconductor (CMOS) and transistor-transistor logic (TTL).       
SOT123              SOT123 is a flanged, ceramic, surface-mounted, small outline transistor (SOT) package with two mounting holes and four leads.        
SOT143              SOT143 is a plastic, surface-mounted, small outline transistor (SOT) package with four leads.       
SOT223              SOT223 is a plastic, surface-mounted, small outline transistor (SOT) package with four leads and a heat sink. During soldering, the formed leads absorb thermal stress and eliminate the possibility of damage to the die. The encapsulation material enhances device reliability, allowing SOT223 to provide excellent performance in environments with high temperatures and humidity levels. SOT223 provides power dissipation of 1-1.5 W.       
SOT323              SOT323 is a plastic, surface-mounted, small outline transistor (SOT) package with three leads.       
TO-251 / TO-252 TO-251 and TO-252 are low-to-medium-power packages that feature a transistor outline (TO). TO-251 uses throughhole technology (THT). TO-252 uses surface-mount technology (SMT). Both packages provide several lead frame choices and are commonly used in home appliances, personal computers, lighting, and automotive systems.           
FPAK                  Flat package (FPAK).       
Other                 Other unlisted or proprietary packages.  
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WEET PNP Silicon Epitaxial Planar Transistors MMBT3904 MMBT3906 MMBT8050C MMBT8050D MMBT8550C MMBT8550D
Spec.:
SOT-23(TO-236) MMBT3904 General Purpose Transistors NPN Transistor 350mW PNP Small Signal Bipolar (BJT) Transistors
https://weetcl.com/pdf/WEET_Transistors_SOT-23_MMBT3904.pdf 
SOT-23(TO-236) MMBT3906 General Purpose Transistors PNP Transistor 350mW PNP Small Signal Bipolar (BJT) Transistors
https://weetcl.com/pdf/WEET_Transistors_SOT-23_MMBT3906.pdf 
SOT-23(TO-236) MMBT8050 (MMBT8050C, MMBT8050D) General Purpose Transistors 40V SMD NPN Bipolar (BJT) Transistors
https://weetcl.com/pdf/WEET_Transistors_SOT-23_MMBT8050.pdf 
SOT-23(TO-236) MMBT8550 (MMBT8550C, MMBT8550D) SMD Small Signal Transistor Bipolar (BJT) Switch Transistors
https://weetcl.com/pdf/WEET_Transistors_SOT-23_MMBT8550.pdf 

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MMBT3904 and MMBT3906 are general-purpose transistors characterized by continuously adjustable voltage, low dynamic output resistance, flat temperature characteristics, and low output voltage noise.

Name of Product: MMBT3904 MMBT3906
Product Category: Bipolar Transistors - BJT
Transistor type: general small signal
Mounting Style: SMD/SMT
Transistor polarity: PNP
Configuration: Single
Voltage, Vceo: 40V
Power consumption, Pd: 350mW
Package Type: SOT-23
Packaging: Tape Reel
Factory Pack Quantity: 3000
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WEET Transistors SOT-23 BC856 BC857 BC858 BC859 BC860  
Specs.: https://www.weetcl.com/pdf/WEET_Transistors_SOT-23_BC856_THRU_BC860.pdf 

Series: BC856 BC857 BC858 BC859 BC860
Manufacturer: WEET
Product Category: Bipolar Transistors - BJT
Mounting Style: SMD/SMT
Package / Case: SOT-23
Transistor Polarity: PNP
Configuration: Single
Collector- Base Voltage VCBO Max: 80V for BC856 ; 50V for BC857/BC860 ; 30V for BC858/BC8659
Collector- Emitter Voltage VCEO Max: 65V for BC856 ; 45V for BC857/BC860 ; 30V for BC858/BC8659
Emitter- Base Voltage VEBO: 5V
Maximum DC Collector Current: 200mA
Gain Bandwidth Product fT: 100MHz
Operating Temperature Range: - 65 C + 150 C
Pd - Power Dissipation: 200mW
Packaging: Tape Reel
Factory Pack Quantity: 3000
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WEET Transistors SOT-23 BC846 BC847 BC848 BC849 BC850  
As complementary types the PNP transistors BC856 BC857 BC858 BC859 BC860 are recommended.

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

Series: BC846 BC847 BC848 BC849 BC850
Manufacturer: WEET
Product Category: Bipolar Transistors - BJT
Mounting Style: SMD/SMT
Package / Case: SOT-23
Transistor Polarity: NPN
Configuration: Single
Collector- Base Voltage VCBO Max: 80V for BC846 ; 50V for BC847/BC850 ; 30V for BC848/BC849
Collector- Emitter Voltage VCEO Max: 65V for BC846 ; 45V for BC847/BC850 ; 30V for BC848/BC849
Emitter- Base Voltage VEBO: 5V
Maximum DC Collector Current: 200mA
Gain Bandwidth Product fT: 100MHz
Operating Temperature Range: - 65 C + 150 C
Pd - Power Dissipation: 300mW

Packaging: Tape Reel
Factory Pack Quantity: 3000
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WEET Transistors SOT-23 BC807/BC808, BC817/BC818
These transistors are subdivided into three groups -16, -25, -40 according to their current gain.   
the PNP transistors BC807 and BC808 are recommended as complementary types of BC817 and BC818.
the NPN transistors BC817 and BC818 are recommended as complementary types of BC807 and BC808.

Specs.: https://www.weetcl.com/pdf/WEET_Transistors_SOT-23_BC807_BC808.pdf 
https://www.weetcl.com/pdf/WEET_Transistors_SOT-23_BC817_BC818.pdf 

Series: BC807/BC808, BC817/BC818
Manufacturer: WEET
Product Category: Bipolar Transistors - BJT
Mounting Style: SMD/SMT
Package / Case: SOT-23
Transistor Polarity: PNP for BC807/BC808, NPN for BC817/BC818

Configuration: Single
Collector- Base Voltage VCBO Max: 50V for BC807/BC817 ; 35V for BC808/BC818
Collector- Emitter Voltage VCEO Max: 45V for BC807/BC817 ; 25V for BC808/BC818
Emitter- Base Voltage VEBO: 5V
Maximum DC Collector Current: 500mA
Gain Bandwidth Product fT: 80MHz for BC807/BC808; 100MHz for BC817/BC818
Operating Temperature Range: - 55 C + 150 C
Pd - Power Dissipation: 300mW
Packaging: Tape Reel
Factory Pack Quantity: 3000
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1.0Amps 50V-2000V SMA(DO-214AC) S1AE THRU S1YE (S1AE, S1BE, S1DE, S1GE, S1JE, S1KE, S1ME, S1TE, S1WE, S1XE, S1YE) General Purpose Plastic Rectifier
Details: https://weetcl.com/General_Purpose_Rectifiers/SMA_S1AE_THRU_S1YE.html 
Specs.: https://weetcl.com/pdf/WEET_SMA_S1AE_THRU_S1YE.pdf 
Description: Rectifiers 1.0Amps 50V-2000Volt
Type: Standard Recovery Rectifiers
Mounting Style: SMD/SMT
Package / Case: DO-214AC(SMA,SMA-J)
Vr - Reverse Voltage: S1AE(50V), S1BE(100V), S1DE(200V), S1GE(400V), S1JE(600V), S1KE(800V), S1ME(1000V), S1TE(1300V), S1WE(1600V), S1XE(1800V), S1YE(2000V)
If - Forward Current: 1.0 A
Configuration: Single
Vf - Forward Voltage: 1.1 V
Max Surge Current: 30 A
Ir - Reverse Current: 5 uA(TA= 25°C), 50 uA(TA= 125°C)
Operating and Storage Temperature Range: - 55 C to + 150 C
Height: 1.98-2.42mm
Length: 3.99-4.50mm
Width: 2.54-2.80mm
Brand: WEET
Packaging: Tape Reel
Factory Pack Quantity: 5000
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1.5Amps 200V-1600V SMA DO-214AC SMA-J BYG10D THRU BYG10Y (BYG10D, BYG10G, BYG10J, BYG10K, BYG10M, BYG10Y) General Purpose Plastic Rectifier

In Package SMA(DO-214AC):
Details: https://weetcl.com/General_Purpose_Rectifiers/SMA_BYG10D_THRU_BYG10Y.html 
Specs.: https://weetcl.com/pdf/WEET_SMA_BYG10D_THRU_BYG10Y.pdf 

In Package SMA-J:
Details: https://weetcl.com/General_Purpose_Rectifiers/SMAJ_BYG10D_THRU_BYG10Y.html 
Specs.: https://weetcl.com/pdf/WEET_SMAJ_BYG10D_THRU_BYG10Y.pdf 

Type: Standard Recovery Rectifiers

Description: Rectifiers 1.5Amps 200V-1600Volt

Mounting Style: SMD/SMT
Package / Case: DO-214AC(SMA,SMA-J)
Vr - Reverse Voltage: BYG10D(200V), BYG10G(400V), BYG10J(600V), BYG10K(800V), BYG10M(1000V), BYG10Y(1600V)
If - Forward Current: 1.5 A
Configuration: Single
Vf - Forward Voltage: 1.15 V
Max Surge Current: 30 A
Ir - Reverse Current: 5 uA(TA= 25°C), 10 uA(TA= 125°C)
Operating and Storage Temperature Range: - 55 C to + 150 C
Height: 1.98-2.42mm(SMA-J)
Length: 3.99-4.50mm(SMA-J)
Width: 2.54-2.80mm(SMA-J)
Brand: WEET
Packaging: Tape Reel
Factory Pack Quantity: 5000

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ES2J belongs to ultra fast recovery diode series and is packaged in SMA/SMB. Its outstanding feature is that the reverse recovery time is short. Please see below for specific parameters.

details: https://weetcl.com/Ultra_Fast_Recovery_Rectifiers/SMB_ES2A_THRU_ES2J.html 

datasheet: https://weetcl.com/pdf/WEET_SMB_ES2A_THRU_ES2J.pdf 

As a professional Chinese factory, WEET is specialized in Diode rectifiers, Bridge rectifiers, Transistors manufacturing and supplying. 

Now let's take a factory tour for investigation: 

https://weetcl.com/Factory_Photos/

https://weetcl.com/Company_Facility/ 

Package Type     Product Type                            KKpcs            Typical Products

SMB                   Surface Mount SMD Diodes     90                   ES2J,S3M,RS2M,SMBJ33CA

SMC                  Surface Mount SMD Diodes      20                   ES5J,RS3M,S5M,SMCJ36CA

SMAF                Surface Mount SMD Diodes      300                 M7,RS1M,ES1J,ES2J

SMA-J               Surface Mount SMD Diodes      225                 SS14,ES1D,US1M

SMA                 Surface Mount SMD Diodes       75                   SS310,RS2M,SMAJ15CA

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In high frequency, high current rectification, and freewheeling circuits, a fast recovery diode (FBR), an ultra fast recovery diode (SRD), and a Schottky diode (SBD) are widely used.
Fast recovery, Ultra/Super fast recovery diode structure:
The internal structure of the fast recovery diode is different from that of a normal diode. It adds a base region I between the P-type and N-type silicon materials to form a P-I-N silicon wafer. Since the base region is very thin, the reverse recovery charge is small, which not only greatly reduces the trr value, but also reduces the transient forward voltage drop, so that the tube can withstand a high reverse operating voltage. The reverse recovery time of the fast recovery diode is typically several hundred nanoseconds, the forward voltage drop is about 0.6V, the forward current is several amps to several thousand amps, and the reverse peak voltage can be several hundred to several thousand volts. The reverse recovery charge of the Ultra fast recovery diode is further reduced, making its trr as low as tens of nanoseconds.
WEET popular 1A-5A surface mount super fast recovery rectifiers:
1A: ES1A-ES1J 50V-600V SMA(DO-214AC)/SMB(DO-214AA) reverse recovery time: 35nS
https://weetcl.com/pdf/WEET_SMA_ES1A_THRU_ES1J.pdf 
https://weetcl.com/pdf/WEET_SMB_ES1AB_THRU_ES1JB.pdf 
2A: ES2A-ES2J 50V-600V SMA(DO-214AC)/SMB(DO-214AA) reverse recovery time: 35nS
https://weetcl.com/pdf/WEET_SMA_ES2A_THRU_ES2J.pdf 
https://weetcl.com/pdf/WEET_SMB_ES2A_THRU_ES2J.pdf 
3A: ES3A-ES3J 50V-600V SMB(DO-214AA)/SMC(DO-214AB) reverse recovery time: 35nS
https://weetcl.com/pdf/WEET_SMB_ES3A_THRU_ES3J.pdf     
https://weetcl.com/pdf/WEET_SMC_ES3A_THRU_ES3J.pdf 
5A: ES5A-ES5J 50V-600V SMB(DO-214AA)/SMC(DO-214AB) reverse recovery time: 35nS
https://weetcl.com/pdf/WEET_SMC_ES5A_THRU_ES5J.PDF

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All WEET Diode Rectifiers, Bridge Rectifiers, Transistors are compliant with ISO 9001:2015, RoHS 2.0, REACH Standard. Free samples can be arranged for quality recognization upon demands. The whole WEET team is dedicated in striving every effort for reaching customers highest requirement.
https://weetcl.com/Quality_Policy/# 
WEE Technology Diode Rectifiers SGS RoHS II Certification: https://weetcl.com/pdf/WEE-Technology-Diodes-Rectifiers-RoHS-II-2019.pdf   
WEE Technology Diode Rectifiers Reach Certification: https://weetcl.com/pdf/WEE-Technology-Diodes-Rectifiers-REACH-2019.pdf   
How to order SMC DO-214AB 5A 50V to 600Volts ES5A-ES5J:
Know General details: https://weetcl.com/Ultra_Fast_Recovery_Rectifiers/WEE_SMC_ES5A_THRU_ES5J.html 
Know Specification: https://weetcl.com/pdf/WEET_SMC_ES5A_THRU_ES5J.PDF 
Know Package MOQ and Packing Information: https://weetcl.com/Packing_Info/   
                        Package     Packing       KPcs/CTN      MPQ        Carton Size MM     
                        SMC           T/R              42                  3K            365*365*365     
Know price, L/T, incoterms: info@weediode.com 

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WEET is a professional Chinese factory specialized in Diode rectifiers, Bridge rectifiers, Transistors. 

Now let's take a factory tour for investigation: 

https://weetcl.com/Factory_Photos/ 

https://weetcl.com/Company_Facility/ 

Package Type  Product Type                          KKpcs     Typical Products

SMC                 Surface Mount SMD Diodes   20          ES5J,RS3M,S5M,SMCJ36CA

SMAF               Surface Mount SMD Diodes   300         M7,RS1M,ES1J,ES2J

SMA-J              Surface Mount SMD Diodes   225         SS14,ES1D,US1M

SMA                 Surface Mount SMD Diodes   75           SS310,RS2M,SMAJ15CA

SMB                 Surface Mount SMD Diodes    90           S3M,RS2M,SMBJ33CA

SMC ES5J is becoming widely used in the global market, it's a good time to enjoy more benefit from our superior support, never hesitate to consult us the best solution. 

details: https://weetcl.com/Ultra_Fast_Recovery_Rectifiers/WEE_SMC_ES5A_THRU_ES5J.html 

datasheet: https://weetcl.com/pdf/WEET_SMC_ES5A_THRU_ES5J.PDF 

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1.5KE TVS diode is an electronic protection component commonly used in circuit protection. The so-called circuit protection is to protect the components in the circuit from damage such as overvoltage, overcurrent, surge, electromagnetic interference. With the vigorous development of scientific information technology, electronic and power products are increasingly diversified, intelligent, integrated, and miniaturized. The simple circuit protection components in the past can not meet the requirements of today's circuit protection. At present, commonly used circuit protection components are: TVS transient suppression diode, ESD electrostatic protection diode, varistor, self-recovery fuse, ceramic gas discharge tube, semiconductor discharge tube, etc..
TVS diodes are available in a wide variety of models, with their own unique aura (PS-level response speed, large pulse transient power, easy control of clamp voltage, low breakdown voltage, low leakage current, high reliability, no damage limit, small size, easy to install), widely used in various types of electronic equipments(automotive electronics, consumer electronics, electronic instrumentation, precision equipment, communication equipment, AC/DC power supply, I/O ports, etc.), lightning protection, anti-light overvoltage, anti-interference, absorption of surge power, etc.
TVS diodes 1.5KE series model details: https://weetcl.com/pdf/WEET_DO27_1.5KE_Series.pdf 

1.5KE6.8A/CA, 1.5KE7.5A/CA, 1.5KE8.2A/CA, 1.5KE9.1A/CA, 1.5KE10A/CA, 1.5KE11A/CA, 1.5KE12A/CA, 1.5KE13A/CA, 1.5KE15A /CA, 1.5KE16A/CA, 1.5KE18A/CA, 1.5KE20A/CA, 1.5KE22A/CA, 1.5KE24A/CA, 1.5KE27A/CA, 1.5KE30A/CA, 1.5KE33A/CA, 1.5KE36A/CA, 1.5KE39A /CA, 1.5KE43A/CA, 1.5KE47A/CA, 1.5KE51A/CA, 1.5KE56A/CA, 1.5KE62A/CA, 1.5KE68A/CA, 1.5KE75A/CA, 1.5KE82A/CA, 1.5KE91A/CA, 1.5KE100A /CA, 1.5KE110A/CA, 1.5KE120A/CA, 1.5KE130A/CA, 1.5KE150A/CA, 1.5KE160A/CA, 1.5KE170A/CA, 1.5KE180A/CA, 1.5KE200A/CA, 1.5KE220A/CA, 1.5KE250A /CA, 1.5KE300A/CA, 1.5KE350A/CA, 1.5KE380A/CA, 1.5KE400A/CA, 1.5KE440A/CA, 1.5KE500A/CA, 1.5KE520A/CA, 1.5KE550A/CA, 1.5KE600A/CA...
Among them, 1.5KE6.8A/CA, 1.5KE18A/CA, 1.5KE27A/CA, 1.5KE33A/CA, 1.5KE440CA are the most commonly used TVS diodes in the market. WEET offer excellent quality, factory direct sales, technical assistance, and timely after-sales service.

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WEET Updated the latest RoHS 2.0 and Reach 191 SGS testing report, all of WEET diodes and rectifiers are green products. For more details please check below link, thank you.

https://www.weetcl.com/pdf/WEE-Technology-Diodes-Rectifiers-RoHS-II-2019.pdf

https://www.weetcl.com/pdf/WEE-Technology-Diodes-Rectifiers-REACH-2019.pdf

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TVS tube P6KE series, with peak pulse power of 600W at 10x1000u waveform repetition rate, DO-15 package glass passivation sheet, response speed P seconds, transient power, excellent clamping voltage capability, low leakage current It has the characteristics of small breakdown voltage, small volume, high reliability and high reliability. It is widely used in various circuits such as computer, communication, industrial, consumer electronics and I/O interfaces. WEET TVS tube has a wide variety and complete models. The specific models of P6KE series are as follows:
WEET P6KE bidirectional TVS diode series models:
P6KE6.8CA, P6KE7.5CA, P6KE8.2CA, P6KE9.1CA, P6KE10CA, P6KE11CA, P6KE12CA, P6KE13CA, P6KE15CA, P6KE16CA, P6KE18CA, P6KE20CA, P6KE22CA, P6KE24CA, P6KE27CA, P6KE30CA, P6KE33CA, P6KE36CA, P6KE39CA, P6KE43CA, P6KE47CA, P6KE51CA, P6KE56CA, P6KE62CA, P6KE68CA, P6KE75CA, P6KE82CA, P6KE91CA, P6KE100CA, P6KE110CA, P6KE120CA, P6KE130CA, P6KE150CA, P6KE160CA, P6KE170CA, P6KE180CA, P6KE200CA, P6KE220CA, P6KE250CA, P6KE300CA, P6KE350CA, P6KE380CA, P6KE400CA, P6KE440CA, P6KE500CA, P6KE520CA, P6KE550CA, P6KE600CA.WEET 

P6KE series unidirectional TVS Diodes Part Number Index:
P6KE6.8A, P6KE7.5A, P6KE8.2A, P6KE9.1A, P6KE10A, P6KE11A, P6KE12A, P6KE13A, P6KE15A, P6KE16A, P6KE18A, P6KE20A, P6KE22A, P6KE24A, P6KE27A, P6KE30A, P6KE33A, P6KE36A, P6KE39A, P6KE43A, P6KE47A, P6KE51A, P6KE56A, P6KE62A, P6KE68A, P6KE75A, P6KE82A, P6KE91A, P6KE100A, P6KE110A, P6KE120A, P6KE130A, P6KE150A, P6KE160A, P6KE170A, P6KE180A, P6KE200A, P6KE220A, P6KE250A, P6KE300A, P6KE350A, P6KE380A, P6KE400A, P6KE440A, P6KE500A, P6KE520A, P6KE550A, P6KE600A.
TVS diodes are unidirectional and bidirectional. The characteristics of unidirectional TVS tubes are similar to those of Zener tubes. The characteristics of bidirectional TVS tubes are equivalent to the reverse connection of two Zener tubes. There are three methods for distinguishing the single bidirectional method of TVS tube. The most intuitive one is to look at the model. From the above P6KE series TVS tube model, it can be clearly seen that the two-way P6KE series TVS tube has more than one letter C in one direction; The second method is to read the specification book, the two-way TVS tube double-conducting, the one-way TVS tube single-passing; the third method, with the aid of the tool multimeter, the two-way two sides have voltage, one-way one-way.
The difference between unidirectional transient suppression diodes determines the environmental conditions of their application. Generally, the unidirectional TVS tube is used in a DC circuit, and the bidirectional TVS tube is used in an AC circuit and a USB data line.
Specification: https://weetcl.com/pdf/WEET_DO15_P6KE_Series.pdf  

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SF28 is an express recovery diode, which can be replaced by SF38. The larger one can use SF58, but the package volume will be different. If the package requirements are the same, it can be packaged with a larger chip. The specific parameters are as follows.
SF28: current 2A, voltage 600V, recovery time 35ns (nanoseconds), voltage drop 1.7V, package DO-15, specification: https://weetcl.com/pdf/WEET_DO15_SF21G_THRU_SF28G.pdf  
https://weetcl.com/pdf/WEET_DO15_SF21_THRU_SF28.pdf  
SF38: current 3A, voltage 600V, recovery time 35ns (nanoseconds), voltage drop 1.7V, package DO-27, specification: https://weetcl.com/pdf/WEET_DO27_SF31G_THRU_SF38G.pdf  
https://weetcl.com/pdf/WEET_DO27_SF31_THRU_SF38.pdf  
SF58: current 5A, voltage 600V, recovery time 35ns (nanoseconds), voltage drop 1.7V, package DO-27, specification: https://weetcl.com/pdf/WEET_DO27_SF51G_THRU_SF58G.pdf  
https://weetcl.com/pdf/WEET_DO27_SF51_THRU_SF58.pdf  
DO-15 size chart:                                                DO-27 size chart:

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How to order SMB DO-214AA 2A 50V to 600Volts ES2A-ES2J:
Know General details: https://weetcl.com/Ultra_Fast_Recovery_Rectifiers/SMB_ES2A_THRU_ES2J.html 
Know Specification: https://weetcl.com/pdf/WEET_SMB_ES2A_THRU_ES2J.pdf   
Know Package MOQ and Packing Information: https://weetcl.com/Packing_Info/    
                        Package     Packing       KPcs/CTN      MPQ        Carton Size MM     
                        SMB           T/R              48                  3K            365*365*365     
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All WEET Diode Rectifiers, Bridge Rectifiers, Transistors are compliant with ISO 9001:2015, RoHS 2.0, REACH Standard. Free samples can be arranged for quality recognization upon demands. The whole WEET team is dedicated in striving every effort for reaching customers highest requirement.
https://weetcl.com/Quality_Policy/#   
WEE Technology Diode Rectifiers SGS RoHS II Certification: https://weetcl.com/pdf/WEE-Technology-Diodes-Rectifiers-RoHS-II-2019.pdf    
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Free samples can be provided for apperance observation and functional test, just let us which parameters matter for your usage, we make related solutions for your application.
Maximum Repetitive Peak Reverse Voltage: 50V(SF31G) 100V(SF32G) 150V(SF33G) 200V(SF34G) 300V(SF35G) 400V(SF36G) 500V(SF37G) 600V(SF38G)
Maximum Average Forward Rectified Current 0.375”(9.5mm) lead length at TA=55℃: 3.0 Amps
Maximum Instantaneous Forward Voltage at 3.0A: 0.95V(SF31G,SF32G,SF33G,SF34G),1.25V(SF35G,SF36G),1.70V(SF37G,SF38G)
Maximum Reverse Recovery Time Test conditions lF= 0.5A, lR= 1.0A, lRR=0.25A: 35 nS
Operating Junction Temperature Range, Storage Temperature Range: (-55 to +150) ℃
details: https://weetcl.com/Ultra_Fast_Recovery_Rectifiers/DO27_SF31G_THRU_SF38G.html 
datasheet: https://weetcl.com/pdf/WEET_DO27_SF31G_THRU_SF38G.pdf 
As a professional Chinese factory, WEET is specialized in Diode rectifiers, Bridge rectifiers, Transistors manufacturing and supplying.
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Package Type               Product Type                              KKpcs                Typical Products
DO-27                         Through Hole Dip Diodes            90                      SF38G,SF56G,SR340,HER308
DO-41                         Through Hole Dip Diodes            225                    1N4007,HER104,SF18,FR107
DO-15                         Through Hole Dip Diodes            120                    SF28,RL207,HER208
DO-201AE                  Through Hole Dip Diodes             45                      1.5KE15CA,1.5KE250CA
R-1                             Through Hole Dip Diodes              8                        1A5,1A6,1A7
R-6                             Through Hole Dip Diodes              8                        P6A10,6A10,10A10

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