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How to correctly determine the positive and negative poles of chip tantalum capacitors?

  How to correctly determine the positive and negative poles of chip tantalum capacitors?

  One end of the chip tantalum capacitor is marked with a horizontal line, which is the positive electrode of the chip tantalum capacitor, and the other end is the negative electrode. The long end of the lead tantalum capacitor is the positive electrode, and the short end is the negative electrode.

  SMD tantalum capacitors are polar capacitors. The positive and negative poles cannot be reversed. In case of reverse connection, the tantalum capacitor will not work or fail.

  The positive and negative poles of SMD tantalum capacitors are distinguished and measured. The black block with the mark on the tantalum capacitor is the negative pole. There are two semicircles on the capacitor position on the PCB, and the pin corresponding to the colored semicircle is the negative pole. The length of the pins is also used to distinguish the positive and negative poles as positive and short pins as negative.

  When we don’t know the positive and negative poles of SMD tantalum capacitors, we can use a multimeter to measure them. The medium between the two poles of the capacitor is not an absolute insulator, and its resistance is not infinite, but a finite value, generally above 1000 megohms. The resistance between the two poles of the capacitor is called insulation resistance or leakage resistance, and only electrolytic capacitors When the positive pole of the electrolytic capacitor is connected to the positive power supply (the black test lead when the electricity is blocked), and the negative terminal is connected to the negative power supply (the red test lead when the electricity is blocked), the leakage current of the electrolytic capacitor is small (the leakage resistance is large).


Chip MLCC Capacitors Compound Annual Growth Rate

  Chip MLCC Capacitors Compound Annual Growth Rate

  What is CAGR, CAGR means Compound annual growth rate, annual growth rate of an investment over a specified period of time longer than one year.  Chip MLCC CAGR is around 8%! Until end of 2021, some manufacturers still offer chip mlcc with 20 weeks. MLCC have a increasing demand.

  Why engineers prefer to use chip mlcc?

  a.  chip mlcc have small size

  b.  chip mlcc is cost effective

  c.  chip mlcc technology have big improvement, especially in large capacitance and high voltage.

  d.  tantalum capacitors are unstable in supply, and prices very expensive.

  With the delay in 2021, new MLCC spot shortages have forced some industries to become agile and adapt to supply chain fluctuations.

  Through 2021, the shortage of automotive chips remains the same. Although companies such as Intel and TSMC are investing in increasing fab capacity, many in the industry and the financial industry predict that the shortage will continue into 2023. The price tag is also shocking. It is estimated that the loss of income will now exceed 100 billion US dollars. Take the automobile industry as an example.

  The shortage of electronic components is nothing new in 2020 and 2021. In 2020, this is due to everyone staying at home for reasons such as vacations, panic buying, excessive demand for home-working electronics, and/or forced lockouts. By 2021, pent-up consumer demand, capital expenditures, and investment in reopening games appear to be creating shortages in everything from wood to plastic.

  The repeated shortage in 2017 is rooted in the shortage of multilayer ceramic capacitors (MLCC). The shortage of these components began to reach a worrying level in 2018 and then eased in 2019. In 2020, COVID-19 has caused obvious problems in global manufacturing capacity, renewing concerns about the shortage of MLCC. By mid-2021, due to supply chain issues in industrial, medical, and military systems, concerns about the shortage of MLCC continue, especially now that more than one manufacturer has sounded the alarm. There are now some questions as to whether the overall shortage will extend beyond these specific industries and affect the broader electronics market. If you are planning a design that requires MLCC, you may need to plan alternatives in case the components you need are out of stock and have a long lead time.

  Who may be affected by the MLCC shortage?

  The current wave of MLCC shortages is affecting many industries other than automobiles. Of course, in addition to a large number of other electronic products, automobiles also need capacitors, but the industries that have recently made headlines are defense electronics, medical equipment, and industrial automation.

  So is this a supply-driven or demand-driven shortage? Interestingly, the inventory problems in these industries are a bit of both. Some products that drive MLCC inventory consumption include:

  Low-power radar, radio and wireless network products operating at GHz frequency

  Devices that support 5G, such as mobile phones, IoT products, base station equipment and other telecommunication equipment

  Consumer electronics products (laptops, smart phones, etc.) now require more MLCC than a few years ago

  MLCC in these products is used very much, and small-case capacitors (<0603) are used. In particular, these components are low-Q, low-voltage capacitors used to achieve broadband decoupling and filtering to high frequencies in products with radio frequency capabilities. When you consider that the average smartphone or tablet computer contains more small-case capacitors than ever before, the demand and market size in this area have motivated MLCC manufacturers to shift their capacitors to meet the needs in these areas.

  Therefore, industrial, medical, and military products that require high-voltage, high-Q MLCCs are facing pressure to reduce inventory of large-size MLCCs. Affected products include power supplies/regulators, MRI coils, amplifiers, lasers, and many other specialized products that require larger enclosures.

  Adapt to changing supply

  In order to adapt to the growth in demand for consumer electronics products (mainly smartphones, tablets and other products) last year, most of the manufacturing capabilities of MLCCs have shifted from high-Q/high-voltage capacitors to smaller, lower-Q capacitors. These are physically Smaller components tend to have lower voltage ratings and higher self-resonance; the lower voltage ratings of smaller housing sizes make them less useful in the affected industries. In addition, strict gap restrictions in smaller consumer devices limit the use of larger housing sizes because they may not be suitable for smaller housings for consumer devices.

  Considering the needs of various housing sizes and the shift to consumer electronics, I don’t think we should be surprised by these developments. Compared with the situation in 2018, the total inventory data of distributors shows that it is difficult to call this a full-scale MLCC shortage because, as mentioned above, it does not affect all industries or manufacturers. However, the inventory throughout the supply chain has been steadily decreasing. This emphasizes the need for design teams to plan ahead and consider replacing their products.

  At present, American EMS suppliers are transferring their onshore production capacity or adding new production capacity online to solve the shortage of the entire supply chain. Time will tell how this particular part of the capacitor market will develop and whether demand will continue to consume capacitor inventories in the long term. At the same time, PCB designers and engineers need to consider how to adjust their designs to withstand the MLCC shortage and continue to bring products to the market.

  Supply chain visibility helps companies stay agile

  The growth of consumer electronics products and the recurring business cycles of the electronics industry will continue to put pressure on the MLCC supply chain. Even after the input capacity helps alleviate the current shortage, I expect that we will reappear in the next business cycle. When the inventory of distributors and manufacturers fluctuates, companies large and small that use MLCC for design need to remain agile. Make sure to use the best electronic supply chain tools and search engines to browse the distributor’s inventory and find replacement parts. When you understand the supply chain when you plan to enter the manufacturing phase, you can ensure that your products can be mass-produced on time.

  Even if chip mlcc shortage happen again in 2022, Topdiode Group UF Capacitors, as a chip MLCC capacitors supplier, we have enough capacity to ship within 2 weeks.


What is an LED driver?

  Topdiode Group & UF Capacitors provide components solution for below: Led control circuit; SMPS for LED TV, SMPS circuit; ESL.

  Basic knowledge of drive


  What is an LED driver?


  The LED driver changes the power supply to a specific voltage and current to drive the LED voltage converter. Generally speaking, the input of the LED driver includes high-voltage power frequency AC (ie, mains), low-voltage DC, high-voltage DC, and low-voltage and high-frequency AC (such as the output of electronic equipment). transformer). The output of the LED driving power supply is mostly a constant current source, and the voltage can be changed as the forward voltage drop of the LED changes. The core components of LED power supply include switching controller, inductor, switching element (MOSFET), feedback resistor, input filter, output filter, etc. According to the requirements of different occasions, there must be input overvoltage protection circuit, input undervoltage protection circuit, LED open circuit protection,

  Electronic Shelf Label (ESL) Circuit, PCB Assembling

  Low loss rectifier circuit 

  Multi-channel LED control 

  SMPS for LED TV

  LCD TV SMPS

  Electronic Shelf Label circuit use 100uF 6.3V A case tantalum capacitors, in the past, only AVX Capacitors can provide 100uF in A case. We Topdiode UF Capacitors, #Chinacapacitorsfactory#chinacapacitorssupplier have mature technology, and we can supply 100uF in A case.

  6.3V 100UF 107J TAJA107K006RNJ A case ±10% 1206 SMD Tantalum Capacitors

  SMD tantalum capacitor 100UF 3216 AVX TAJA107K006RNJ 6.3V type A

  TAJA685K016RNJ 16V 6.8UF 685C A case ±10% 1206 SMD Tantalum Capacitors

  6V 47UF A case 476C ±10% 1206 SMD Tantalum Capacitors 3.2mm×1.6mm

  16V 10UF B case 106C TAJB106K016RNJ 1210 ±10% SMD Tantalum Capacitors

  16V 4.7UF 475C TAJA475K016RNJ A case ±10% 1206 SMD Tantalum Capacitors


How to correctly determine the positive and negative poles of chip tantalum capacitors?

How to correctly determine the positive and negative poles of chip tantalum capacitors?

           One end of the chip tantalum capacitor is marked with a horizontal line, which is the positive electrode of the chip tantalum capacitor, and the other end is the negative electrode. The long end of the lead tantalum capacitor is the positive electrode, and the short end is the negative electrode.


   SMD tantalum capacitors are polar capacitors. The positive and negative poles cannot be reversed. In case of reverse connection, the tantalum capacitor will not work or fail.
   The positive and negative poles of SMD tantalum capacitors are distinguished and measured. The black block with the mark on the tantalum capacitor is the negative pole. There are two semicircles on the capacitor position on the PCB, and the pin corresponding to the colored semicircle is the negative pole. The length of the pins is also used to distinguish the positive and negative poles as positive and short pins as negative.
   When we don’t know the positive and negative poles of SMD tantalum capacitors, we can use a multimeter to measure them. The medium between the two poles of the capacitor is not an absolute insulator, and its resistance is not infinite, but a finite value, generally above 1000 megohms. The resistance between the two poles of the capacitor is called insulation resistance or leakage resistance, and only electrolytic capacitors When the positive pole of the electrolytic capacitor is connected to the positive power supply (the black test lead when the electricity is blocked), and the negative terminal is connected to the negative power supply (the red test lead when the electricity is blocked), the leakage current of the electrolytic capacitor is small (the leakage resistance is large).


What are TVS Diodes?

  What are TVS Diodes?

  By Kelvin Tan

  TVS Diodes are electronic components designed to protect sensitive electronics from high-voltage transients. They can respond to overvoltage events faster than most other types of circuit protection devices, and are offered in a variety of surface mount and through-hole circuit board mounting formats.

  They function by limiting voltage to a certain level (referred to as a "clamping" device) with p-n junctions that have a larger cross-sectional area than those of a normal diode, allowing them to conduct large currents to ground without sustaining damage.

  TVS Diodes are generally used to protect against electrical overstress such as those induced by lightning strikes, inductive load switching, and electro-static discharge (ESD) associated with transmission on data lines and electronic circuits.

  topdiode TVS Diodes can fit a wide range of circuit protection applications but were primarily designed to protect I/O interfaces in telecommunication and industrial equipment, computers and consumer electronics.

  topdiode TVS Diode characteristics include:

  Low incremental surge resistance

  Unidirectional and Bidirectional polarities available

  Reverse standoff voltages range from 5 to 512V

  RoHS compliant–Matte Tin Pb-free plated

  Surface-mount power ratings from 400W to 5,000W

  Axial lead power ratings from 400W to 30,000W (30kW)

  High current protection available for 6kA and 10kA

  TVS Diode Glossary

  Clamping Device

  TVS is a clamping device that limits voltage spikes by low impedance avalanche breakdown of a rugged silicon PN junction. It is used to protect sensitive components from electrical overstress generated by induced lightning, inductive load switching and electrostatic discharge.

  Operating Temperature Range

  The minimum and maximum ambient operating temperature of the circuit in which a device will be applied. Operating temperature does not allow for the effects of adjacent components, this is a parameter the designer must take into consideration.

  Capacitance

  The property of a circuit element that permits it to store an electrical charge. In circuit protection, the off-state capacitance is typically measured at 1 MHz with a 2V bias applied.

  Reverse Standoff Voltage (VR)

  In the case of a uni-directional TVS diode, this is the maximum peak voltage that may be applied in the 'blocking direction' with no significant current flow. In the case of a bi-directional transient, it applies in either direction. It is the same definition as Maximum Off-state Voltage and Maximum Working Voltage.

  Breakdown Voltage (VBR)

  Breakdown voltage measured at a specified DC test current, typically 1mA. Usually a minimum and maximum is specified.

  Peak Pulse Current (IPP)

  Maximum pulse current which can be applied repetitively. Usually a 10x1000μs double exponential waveform, but can also be 8x20μs, if stated.

  Maximum Clamping Voltage (VC or VCI)

  Maximum voltage which can be measured across the protector when subjected to the Maximum Peak Pulse Current.

  Peak Pulse Power (PPP)

  Expressed in Watts or Kilowatts, for a 1ms exponential transient  it is IPP multiplied by VCL.




  P4KE6.8-P4KE440CA Axial Leaded 400W TVS Diode P4KE series

  P6KE6.8-P6KE440CA Axial Leaded 600W TVS Diodes P6KE series

  SMAJ5.0--SMAJ440CA Surface Mount TVS -Topdiode

  SMBJ5.0--SMBJ440CASurface Mount TVS -Topdiode

  SMCJ5.0-SMCJ440CA 1500W Suface Mount TVS Diode Topdiode

  TVS DIODE SD03, SD05, SD12-Topdiode

  5.0SMDJ12A-CA-5.0SMDJ170A-CA-Topdiode

  SMDJ5.0--SMDJ170CA-Surface Mount TVS -Topdiode

  ESD3Z_SERIES SOD-323-Topdiode

  SMA6J5.0--SMA6J200CA-Topdiode

  TVS Diodes P6SMB6.8-440ACA Topdiode

  TVS Diodes-P4SMA6.8-440ACA

  1.5KE6.8A-THRU-1.5KE600A-Topdiode


RoHS VS PB FREE

  RoHS VS PB FREE
  By Kelvin Tan
  What is RoHS? What is RoHS 2.0? What is RoHS 3.0?


  Directive 2011/65/EU was published in 2011 by the EU, which is known as RoHS-Recast or RoHS 2. RoHS 2 includes a CE-marking directive, with RoHS compliance now being required for CE marking of products. RoHS 2 also added Categories 8 and 9, and has additional compliance recordkeeping requirements.
  Directive 2015/863 is known as RoHS 3. RoHS 3 adds four additional restricted substances (phthalates) to the list of six.
  As now China's test lab does not have RoHS 3.0 test standard. So Topdiode and UF Capacitors only declare our products are RoHS 2.0 Compliant. We will update our certification according to latest regulations.
  RoHS Compliant for 2022
  Any business that sells applicable electrical or electronic products, equipment, sub-assemblies, cables, components, or spare parts directly to RoHS-directed countries, or sells to resellers, distributors or integrators that in turn sell products to these countries, is impacted if they utilize any of the restricted 10 substances.
  With the rapid spread of digitization, the world's production of electrical and electronic devices is exploding. Besides mobile devices, think about the coming wave of IoT, smart home assistants, robots, drones, 3D printers, and home medical devices to all corners of the planet...they are all regulated under RoHS.
  EU RoHS specifies maximum levels for the following 10 restricted substances. The first six applied to the original RoHS while the last four were added under RoHS 3, which took effect July 22, 2019.
  Cadmium (Cd): < 100 ppm
  Lead (Pb): < 1000 ppm
  Mercury (Hg): < 1000 ppm
  Hexavalent Chromium: (Cr VI) < 1000 ppm
  Polybrominated Biphenyls (PBB): < 1000 ppm
  Polybrominated Diphenyl Ethers (PBDE): < 1000 ppm
  Bis(2-Ethylhexyl) phthalate (DEHP): < 1000 ppm
  Benzyl butyl phthalate (BBP): < 1000 ppm
  Dibutyl phthalate (DBP): < 1000 ppm
  Diisobutyl phthalate (DIBP): < 1000 ppm
  About Lead-Free and RoHS
  In practice, RoHS-compliant is often equated with “lead-free”. However, this is a widespread mistake. The RoHS directive 2002/95/EC aims to minimize the use of hazardous substances (including, among others, lead), but it does not completely exclude a small percentage. One of the great obstacles in implementing the directive was the switchover to lead-free solder, because the limit values (0.1 per cent by weight of the inseparable components) do not admit a lead solder. This is probably the most important reason for the mix-up/equating that comes up again and again.
  Due to environmental concerns, the need for lead-free solutions in electronic components and systems is receiving increasing attention within the semiconductor and electronics industries.
  In a word, Lead Free and Pb Free is the same thing. Due to worldwide environmental restricted chemical and material (RCM) concerns, it was determined lead (Pb) as one of the major substances of concerns. Lead-free devices in electronic components and systems continues to receive significant attention within the semiconductor and electronics industry as a whole.
  Lead Free and Pb Free mean "No PB Process". PB Free and Lead-Free electronics components are definitely RoHS Compliant. But RoHS Compliant did not mean Pb Free of Lead Free.
  RoHS Compliant means lead <1000 PPM, and also accept exemption sometimes.
  Ps: Green products mean stricter: Lead (Pb): < 90 ppm
  Topdiode & UF Capacitors’ all components are RoHS Compliant. But not all our electronic components are PB Free or Lead-Free. If you require Lead-Free, pls check case by case.


Topdiode DB107S

Topdiode DB107S, Bridge Rectifier, 1A 1000V, 4-Pin DBS

  Manufacturer Topdiode part number: DB107S
  Gross weight: 0.378 g
  Bridge rectifier: single-phase; 1000V; If: 1A; SMT Bridge Rectifier,
  DB101S THRU DB107S  Single Phase, Glass Passivated Silicon Bridge Rectifier
  RoHS Reach compliant
  Topdiode L/T: 3-4 wks
  #Rectifler#Single-phasebridgetypefullycontrolledrectifiercircuit#Bridgerectifier#Theroleofthe rectifier#Electronic#rectifier##diode#shortage#chinasupply#maker#electroniccomponents#discrete#semiconductors#transistors#mosfet#diodes#chinabridgefactory#

CL23 Mini box 5mm pitch metalized polyester capacitors.

UF Capacitors are ISO 9001: 2008 certified manufacturer.  We produce ceramic capacitors, radial tantalum capacitors and kinds of MKT MKP film capacitors.
UF Capacitors Offer:
CL23 Mini box 5mm pitch metalized polyester capacitors.
Replacement of Kemet: MKT R82 (R85), Epcos B32529
Lead time: 2-4 weeks

1000pF 100V +/-5% P: 5mm Bulk RoHS       US$0.016/pc

2200pF 400V +/-5% P: 5mm Bulk RoHS       US$0.020/pc

0.68uF 100V +/-5% P: 5mm Bulk RoHS       US$0.065/pc

www.topdiode.com
sales@topdiode.com

 

Vishay Capacitor Mono-Kap 199D 561R 564R

Below I listed you Vishay’s capacitors, we UF Capacitors have replacement offer to Vishay’s cap. We do NOT sell Vishay’s capacitors, and we are manufacturer producing capacitors ourselves in China. Our high quality capacitors can replace Vishay’s below series: Mono-Kap, 199D, A series Axial MLCC, 561R &564R high voltage disc cap.

Do you buy or use Vishay’s capacitors? You could please send me the description or part number, I will cross and quote you.  For many common capacitors, we keep wide stock!

Vishay  K Series Mono-Kap:   Dipped Radial Multilayer Ceramic Capacitors for 50 - 100 Vdc
UF Capacitors’ equivalence offer: CT4 radial multilayer ceramic capacitor
K105K20X7RF53H5
K104K15X7RF5TK2
K103M15Z5UF53L2

VISHAY  199D   Solid-Electrolyte TANTALEX® Capacitors, Resin-Coated, Radial-Lead
UF Capacitors’ equivalence offer: CA42 radial tantalum capacitors
199D475(1)003A(2)(3)
199D685(1)003A(2)(3)
199D106(1)003A(2)(3)

Vishay  A Series  Axial Leaded Multilayer Ceramic Capacitors for General Purpose Class 1, Class 2 and Class 3, 50 VDC, 100 VDC, 200 VDC, 500 VDC
UF Capacitors’ equivalence offer:  CT42 axial lead, multilayer ceramic capacitor
A103Z15Y5VF5###
A473Z15Y5VF5###
A104Z15Y5VF5###

Vishay   561R Series  Lower Voltage Ceramic DC Disc Capacitors 1000 VDC Precision Capacitors
564R and 565R Series  Lower Voltage Ceramic Singlelayer DC Disc Capacitors 2 kVDC to 7.5 kVDC
UF Capacitors' equivalence offer: CT81 high voltage disc ceramic capacitors, 500V to 10KV
561R10TCCT10
561R10TCUT68


High capacitance chip MLCC

High capacitance chip MLCC, Common items with regular stock pls contact sales@topdiode.com  www.topdiode.com

1206, 10nF, +/-10%, 1KV, X7R, T&R, RoHS
1210, 22uF, +/-20%, 16V, X7R, T&R, RoHS
1206, 100uF, +/-20%, 10V, X5R, T&R, RoHS
0603, 10uF, +/-20%, 10V, X5R, T&R, RoHS 0805,
4.7uF, +/-10%, 50V, X5R, T&R, RoHS
0805, 22uF, +/-20%, 16V, X5R, T&R, RoHS
1206, 100uF, +/-20%, 10V, X5R, T&R, RoHS

Ms. Win Tang
Sales Manager
Email:
sales@topdiode.com
Skype: topdiode
Tel.: +86-(0)769 8252 3211
Topdiode Group & UF Capacitors Factory
Website:
www.topdiode.com
ISO 9001: 2008, Military Qualification: GJB90018:2009 for tantalum cap RoHS, Reach, Halogen free, Metal Conflict Free Manufacturer for: Capacitors, MOVs, Diodes, Bridge, Transistors


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