Suntan hot-selling series

June 11, 2020 Views
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Suntan Technology Company Limited
--All kinds of Capacitors

Suntan speciaizes in all kinds of Capacitors more than forty years, including Electrolytic Capacitors, Ceramic Capacitors, Film Capacitor, Mica Capacitors, Diode, Trimmer Capacitor etc with certificate approvals, we have great support on the delivery time and product quality. Hope to cooperate with you soon.

 

Su Suntan New Offer –Transistors SOT23 Package

February 12, 2019 Views
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Suntan Technology Company Limited
---All kinds of Capacitors

Hi Dear Customers,

Do you need Transistors recently?

Suntan releases lots of Transistors with "SOT23" package series now, and the price we offer is highly competitive! Here I list some items for your reference as below. If you have the same or similar requirement, welcome to contact our sales team sales@suntan.com.hk soon for more information!

“SOT23” Package For Your Reference:
BAV70
BZX84C3V0 ~ 39V
BC807-16
BC846A
MMBT3904
MMBT8050C(1.5A)
MMBT9012G
… and so on.

Looking forward to your inquiry!

Another Holiday for Suntan People Coming Soon – The National Day Holiday

September 27, 2018 Views
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Suntan Technology Company Limited
---All kinds of Capacitors

After the Mid-Autumn Festival, we’ll have the National Day holiday next Monday.

Our National Day was set up to commemorate the founding date of the People’s Republic of China - October 1st, 1949.
It is interesting that the National Day in ancient China is only to celebrate the Emperor’s birthday and the date he ascended the throne.

And it’s one of the longest holidays in China. Most of the Chinese people will have 7 days off for it, which makes it also been called as the “Golden Week”.

Suntan sales will only take one day off on October 1st, then get back to normal work the next day.
But kindly notice that our factory staffs will still have a vacation for 7 days. That might affect lead time a bit.
So, if you have any order plans lately, please contact us and place them asap. Thank you!

Su Suntan Launched New Capacitor – TS07S Metallized Polypropylene Film Capacitor – MPP

September 20, 2018 Views
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Suntan Technology Company Limited
---All kinds of Capacitors

Suntan, a Hongkong established manufacturer of Capacitors, Trimming Potentiometers, Varistors, Diodes, Bridge Rectifiers and Switches, has launched a new capacitor – TS07S MEALLIZED POLYPROPYLENE FILM CAPACITOR – MPP.

Features:
Highly reliable because of its excellent Self-Healing performance.
Dissipation Factor is normally low and it is stable against high frequency and change of temperature.
Recommended for high-frequency circuits like s-curve compensating circuit.

Specifications:
OPERATING TEMPERATURE: -40°C to + 85°C
RATED VOLTAGE: DC 100V, 250V, 400V, 630V, 1000V
CAPACITANCE RANGE: 1000pF TO 0.33uF
CAPACITANCE TOLERANCE: +/-5%

More details, please check our datasheet http://www.suntan.com.hk/pdf/Plastic-Film-Capacitors/TS07S.pdf
Please contact our professional sales at sales@suntan.com.hk for a best price.
Look forward to hearing your inquiry!

Suntan TSV Varistor Ammo Package

April 17, 2013 Views
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Suntan Technology Company Limited
---All Kinds of Capacitors

Suntan is with very good support for Multilayer Metal Oxide Chip Varistor. This products is featured with Low firing, Sliver diffusion, Grain resistance, Electrical properties and it is widely used in cellular telephones and automotive electronic subassemblies.

Standard Operating temperature for this product is -55~ +125°C; Working Voltage is 3.3V--68V and it is Low Leakage Current, ROHS compliant.

Suntan also offer TSV Dip Varistor. Size code: TSV05D, TSV07D, TSV10D, TSV14D,  TSV20D, 
Item code: 182K, 152K, 112K, 102K, 911K, 821K, 781K, 751K, 681K, 621K, 561K, 511K, 471K, 431K, 391K, 361K, 331K, 301K, 271K, 241K, 221K, 201K, 181K, 151K, 121K, 101K, 820K, 680K, 560K, 470K, 390K, 330K, 270K, 220K, 180L.

Suntan TSV varistor has bulk (standard), taped versions on reel or in Ammo pack upon request .
If you want to know more details, please visit our websitewww.suntan.com.hk/Varistor/"

Suntan MOV Under Strongest Support Now

March 13, 2013 Views
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 Suntan Technology Company Limited
----All Kinds of Capacitors
 

Suntan dipped varistor TSV series now is under strongest support on technical, price and delivery! Currently we have complete certification including cUL, UL, VDE and RoHS 2.0. We offer full range of dimension, varistor voltage and both bulk and ammo packing and Tape Reel packing. Besides, we can customize for customers to meet different technical requirement like cut leads or crimped leads. Welcome to contact Suntan professional sales for detailed information!

For more details please check :http://www.suntan.com.hk/Varistor/

Su Suntan Variable Capacitors

February 11, 2009 Views
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Suntan Technology Company Limited
---All kinds of Capacitors

Variable capacitors are mostly used in radio tuning circuits and they are sometimes called 'tuning capacitors'. They have very small capacitance values, typically between 100pF and 500pF (100pF = 0.0001µF). The type illustrated usually has trimmers built in (for making small adjustments - see below) as well as the main variable capacitor.

Many variable capacitors have very short spindles which are not suitable for the standard knobs used for variable resistors and rotary switches. It would be wise to check that a suitable knob is available before ordering a variable capacitor.

Variable capacitors are not normally used in timing circuits because their capacitance is too small to be practical and the range of values available is very limited. Instead timing circuits use a fixed capacitor and a variable resistor if it is necessary to vary the time period.

Su Suntan Tiny Capacitors May Overcome Physical Limits of Hard Drives

February 7, 2009 Views
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Storage—there is never enough of it. I still remember when I thought my 700MB hard drive was huge... until I tried to copy an entire CD onto it for faster access. After that, I spent a period stuck choosing music to stick on my three GB hard drive. Two weeks ago, I ditched six months' worth of simulation data because my 320GB hard drive was full. One TB of new drive later, and I'm wondering how soon it will be before I start feeling the squeeze again. Maybe never, if some of the latest research coming out of Korea and Germany bears fruit.

One of the cool things about hard drive technology is how it has actually kept pace with computer needs. The basic mechanism for hard drive storage, however, does have some fundamental limitations, which manufacturers will have to deal with fairly soon. Bits are currently stored in the orientation of tiny magnets, called ferromagnetic domains, on a hard drive platter. The smaller the domain, the easier it is for that orientation to be scrambled by temperature or stray electromagnetic fields. At a certain size, thermal photons (e.g., heat energy from the surrounding case or the underlying disk) have enough energy to flip a domain's orientation. Manufacturers will have to keep their domain sizes significantly bigger than that threshold size to ensure data integrity, which puts a ceiling on storage density, one we're rapidly approaching.

An alternative is to use ferroelectric domains. Unlike ferromagnetic domains, ferroelectric domains have a natural electric field with an orientation that can be used to represent data. Until recently, these haven't looked that attractive because they have pretty much the same limitations that ferromagnetic domains have, but they lack the cool read-out tricks. Ferroelectric materials, however, do have one big advantage over ferromagnetic materials: they can be used to make really good capacitors. This is exactly what the latest research, published in Nature Nanotechnology, is about.

Su Suntan A Bad Capacitor Story Ends Happily

January 31, 2009 Views
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Suntan Technology Company Limited
---All kinds of Capacitors

I worked as a design engineer for an optical-telecom company that had deployed 1000 pieces of equipment worldwide. Having so many modules in the field means a trickle of returns, and it was my job to investigate the failures. One investigation taught me a wonderful lesson.

I received a module whose source of failure was easily identifiable: a charred tantalum capacitor. It failed short, making the whole multithousand-dollar module nonoperational. This surface-mount capacitor—with a 7343 footprint and 20V rating—was sitting on a 12V-dc plane. This failure rate of one capacitor in about 10,000 pieces in this time span was well below the statistical prediction. I took a picture of the fallen capacitor and considered the case closed.

In a few weeks, a customer returned a similar module with a charred and shorted capacitor in the same location. Even including this case, the failure rate was still below statistical prediction. I knew there were five more identical capacitors on the board, sitting in parallel on the same 12V-dc plane. In addition to the module's failure rate, I now had a one-in-six chance with the capacitors. So, I took another picture. I wrote a report to calm upper management, but I had a feeling that I'd better study reliability calculation in general and reliability for tantalum capacitors in particular, and the faster, the better.

In another few weeks, I received another failed module. The same capacitor looked bad. I had by now done my studying and could intimidate other people by saying long and complicated sentences about reliability, but why was it always the same capacitor? Overvoltage? Spikes? No way. The same plane contained plenty of sensitive stuff that would fry well before the capacitor even felt it. Having nothing better, I clung to the theory of excessive ripple current.

The idea of a temperature rise due to ripple current causing the failure gained traction when all three photos of the fallen capacitors revealed a common condition: almost no solder on each negative terminal. The electrical connection was still good, but there was little solder. The capacitor's positive terminal was fine with a fair amount of curvature-profiled solder. I started to promote the idea that the lack of solder had caused impeded thermal contact, but it was only wishful thinking. I calculated the worst ripple current: 10% of the maximum rating. On an operational board, I got less than 5%.

I had already dismissed other ideas—from excessive humidity to airflow turbulence. Suddenly, the picture of the layout popped up in my mind. The layout sections for the five good capacitors were identical: Vias were close to both terminals going down to an internal layer. The bad capacitor had a via at the positive terminal, but, at the negative end, there was a heavy trace going inside the footprint, beneath the capacitor, and only then outside. That's when I knew how to fit together all the pieces of the puzzle.

On the positive terminal, the solder stayed where it was supposed to, clinching the terminal to the PCB (printed-circuit board). On the negative side, however, during assembly, the melted solder drifted under the capacitor and solidified, lifting the negative end and bending the capacitor just enough to create a microcrack—a capacitor's well-known nemesis. I never felt as much excitement writing a technical report as I did the next day.

Su Suntan What is a Varistor?

January 30, 2009 Views
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Suntan Technology Company Limited
---All kinds of Capacitors

A varistor is a type of resistor with a significantly non-ohmic current-voltage characteristic. The name is a portmanteau of variable resistor*, which is misleading since it is not continuously user-variable like a potentiometer or rheostat, and is not a resistor but in fact a capacitor. Varistors are often used to protect circuits against excessive voltage by acting as a spark gap.

The most common type of varistor is the metal oxide varistor, or MOV. This contains a mass of zinc oxide grains, in a matrix of other metal oxides, sandwiched between two metal plates (the electrodes). The boundary between each grain and its neighbour forms a diode junction, which allows current to flow in only one direction. The mass of randomly oriented grains is electrically equivalent to a network of back-to-back diode pairs, each pair in parallel with many other pairs. When a small or moderate voltage is applied across the electrodes, only a tiny current flows, causes by reverse leakage through the diode junctions. When a large voltage is applied, the diode junctions break down because of the avalanche effect, and a large current flows. The result of this behaviour is a highly nonlinear current-voltage characteristic, in which the MOV has a high resistance at low voltages and a low resistance at high voltages.

If the size of the transient pulse (often measured in joules) is too high, the device may melt, or otherwise be damaged. For example, a nearby lightning strike may permanently damage a varistor.

Important parameters for varistors are response time (how long it takes the varistor to break down), maximum current and a well-defined breakdown voltage. When used in communications lines (such as phone lines used for modems), high capacitance is undesirable since it absorbs high frequency signals, thereby reducing the available bandwidth of the line being protected.

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