Kt Kingtronics diode

22 Jun 2011

In simple language, a diode is like which allows electric current to flow in one direction but generally does not allow it to flow in the opposite direction. The direction of the electric current in the diode may be reversed. However, even if it is, the flow will still be one directional.

In electronics, a diode acts similarly to charge carriers. Diodes can also be compared to check valves or switches. If liquid or water were involved instead of current, it would essentially be similar to water flowing upstream or downstream. Put simply, a diode tends to allow for upstream to downstream flow but not the other way around.

We kingtronics have very good offer for diode M7, LL4148, BZV55C, S1M, GS1M, RS1M. And we have our own brand and Trademark: Kt, King, Kingtronics.

Now we have DIODE LL4148 5million pcs in stock, welcome to check and send us inquiry.

Please visit our website: www.kingtronics.com

Transistors are three terminal active devices made from different semiconductor materials that can act as either an insulator or a conductor by the application of a small signal voltage.

The transistor's ability to change between these two states enables it to have two basic functions: "switching" (digital electronics) or "amplification" (analogue electronics).

Then bipolar transistors have the ability to operate within three different regions:

  • 1. Active Region - the transistor operates as an amplifier and Ic = β.Ib
  • 2. Saturation - the transistor is "fully-ON" operating as a switch and Ic = I(saturation)
  • 3. Cut-off - the transistor is "fully-OFF" operating as a switch and Ic = 0

The word Transistor is an acronym, and is a combination of the words Transfer Varistor used to describe their mode of operation way back in their early days of development.

There are two basic types of bipolar transistor construction, PNP and NPN, which basically describes the physical arrangement of the P-type and N-type semiconductor materials from which they are made.

I am sales Kelly from Kingtronics, which is HK based manufacturer, specialized in diode rectifier, bridge rectifier, and transistors.

Small Signal Switching Diode LL4148 Mini Melf, Have 5 Millions Pieces in Stock, First come First serve

Diode rectifier M7 also  have regular stock.

Diode S1M diode have better price offer than before.

May I ask, if you receive our prices offer for bridge rectifier MB10S and DB107? Our bridge rectifier have UL approval.  If you still need UL certification or prices offer for MB10S and DB107, please tell meinfo@kingtronics.com  , OK? I will resend to you.

Please check below our strong items, your any inquiry will be appreciated.

Transistors:  2N3904, 2N3906, 2N5401, 2N5550,2N5551, MMBT3904MMBT3906MMBT8050/8550 C/D, MMBT8050/8550(1.5A) C/D, MMBT8050/8550(2A)C/D; MMBT9012G/H; MMBT9013G/H; MMBT9014B/C/D; MMBT9015B/C/D; MMBT9018G/H

Diode rectifierM7S1MLL4148RS1M, SM4007 melf, BZV55C & ZMM55C, UF4007, 1N4001S-1N4007S, 1N4001-1N4007, 1N5391-1N5399, RL201-RL207, 1N5400-1N5408, 6A05-6A10, FR101-FR107, 1N4933-1N4937, FR151-FR157, FR201-FR207, 1N5817-1N5819, 1N5820-1N5822

Bridge rectifier:  DB101-DB107DB101S-DB107SMB2S-MB10SKBL4005-KBL410, KBU6005-KBU610, KBPC25005-KBPC2510, KBPC25005W-KBPC2510W, KBPC35005-KBPC3510KBPC35005W-KBPC3510W

Best wishes!

Capacitors are devices which store electric charge. They are usually made from two parallel metal surfaces with some insulating dielectric layer between them. If one of the plates is charged, and the other is grounded,  opposite charges will accumulate on it  by influence, while the net charge stays zero. The capacitance is the magnitude of charge on one plate Q divided by the voltage V across the plates.

The unit of capacitance is the farad. 1 F = 1As/V

The capacitance of two parallel metal plate of area A and d distance apart (supposed that the lateral sizes of the plates are much bigger than the distance between them) is

where e is called the permittivity of the insulating material between the plates.

The permittivity of vacuum is e0 = 8.85 ×10-12 As/(Vm).

The capacitance can be increased by applying high permittivity material between the metal plates, like paper, plastic, oil, mica, or ceramic. Typical capacitance values range from about 1 picofarad (pF, 10-12 F) about 1000 microfarads (mF, 10-6 F)

The symbol for capacitor in circuit diagrams is:

The capacitors are rated according to the voltage that can be safely applied across their terminals - breakdown voltage.

The energy stored in a capacitor is

Electrolytic capacitors use aluminium or tantalum plates immersed in a semi-liquid chemical compound which forms a thin insulating oxide layer on one of the electrodes. These types of capacitors are said to be polarized and can be used only in such way that the terminal denoted by “+” is always at higher potential as the “–“ one. Because of the thin oxide layer, the capacitance of the electrolytic capacitor is usually high, 1-1000 mF.

Dipped tantalum capacitors also have high capacitance but small size at the same time. They are made of a sintered tantalum powder core. Because of the pores, it surface is very large. The core is oxidized. The core is dipped into manganese nitrate solution,  than put in a furnace where  the nitrate decomposes into manganese oxide which fills the pores and serves as the other electrode to the capacitor.

We Kingtronics is a reliable, professional manufacturer, can produce military level for dipped tantalum capacitors, our quality is excellent.

More important, now Kingtronics lead time for dipped tantalum improved, for some items, even have stock offer.

For radial multilayer ceramic capacitors, we sell unbeatable prices for radial multilayer ceramic capacitors and axial lead MLCC.

Kingtronics offer replacement dipped tantalum cap:  AVX TAP series; NIC NDTM series; Kemet T350-T390 series; NEMCO TB series; China CA42 series
Kingtronics offer replacement radial multilayer ceramic cap :   AVX SR/SA series; Murata RPE series; NIC NCM series; Kemet C315 series-C350

Could you please spend a few minutes to visit our website: http://www.kingtronics.com , you will find the whole cross reference for capacitors, very nice photos for capacitors, and detailed PDF datasheet

Design of a Bridge Rectifier

Bridge rectifiers change AC voltage into DC voltage.
They are used in a wide variety of electronics and most often found in AC powered devices,
modern home telephones, simple plug-in power supplies and even in high horsepower motor controllers.
Many modern devices have benefited from these solid-state silicon semiconductor devices,
as they have replaced the failure-prone metal oxide rectifiers used many years ago.


Bridge rectifiers can be either in a 'half wave' or a 'full wave' configuration.
Electrolytic filter capacitors are commonly added to smooth the rectification pulsations.
The device can also be used for assuring that DC (battery) power happens in a fixed way
even if the battery is connected improperly. In modern telephones,
they assure proper connectivity and electrical isolation to the incoming phone lines.
Even if the phone wires are miswired, the phone will still work properly.

Kingtronics are a producer of bridge rectifier with many years. We have got UL Certificate for our bridge rectifier.

Here are our Bridge rectifier items: DB107, MB10S, KBL4005,KBU610, KBPC2510,KBPC2510W, KBPC35005-KBPC3510, KBPC3510W........etc..

Any inquiry, pls send email to anna@kingtronics.cn

Hi everyone,

How are you, I am Karen from Kingtronics International company. Are you looking for trimming potentiometer? I am sure Kingtronics is your best choice!

Kingtronics are very professional in trimming potentiometer, items like 3296 3006 3386 3590...these are very famous!

We have the competitive price in the market,fast delivery and high quality,we also cross the famous brand for you.
If you need trimming potentiomet,pls send your requirement to sales2(at)kingtronics.com.
Pls check SGS and Cross reference on below links:

SGS: http://www.kingtronics.com/pdf/sgs.pdf
Cross reference: http://www.kingtronics.com/pdf/cross-reference.pdf

Kingtronics offer high quality and competitive transistor, welcome to send us inquiry!

KT8050/8550 C/D/E TO-92 Bulk
TO-92 Ammo
KT8050/8550 C/D/E(1.5A) TO-92 Bulk
TO-92 Ammo
KT9011G TO-92 Bulk
TO-92 Ammo
KT9012G/H/I TO-92 Bulk
TO-92 Ammo
KT9013G/H/I TO-92 Bulk
TO-92 Ammo
KT9014B/C/D TO-92 Bulk
TO-92 Ammo
KT9015B/C/D TO-92 Bulk
TO-92 Ammo
KT9018G/H TO-92 Bulk
TO-92 Ammo
2N2222A TO-92 Bulk
TO-92 Ammo
2N3904 TO-92 Bulk
TO-92 Ammo
2N3906 TO-92 Bulk
TO-92 Ammo
2N5401 TO-92 Bulk
TO-92 Ammo
2N5550,2N5551 TO-92 Bulk
TO-92 Ammo
MMBT3904 SOT-23 Tape & Reel
MMBT3906 SOT-23 Tape & Reel
MMBT8050/8550 C/D SOT-23 Tape & Reel
MMBT8050/8550(1.5A) C/D SOT-23 Tape & Reel
MMBT8050/8550(2A)C/D SOT-23 Tape & Reel
MMBT9012G/H SOT-23 Tape & Reel
MMBT9013G/H SOT-23 Tape & Reel
MMBT9014B/C/D SOT-23 Tape & Reel
MMBT9015B/C/D SOT-23 Tape & Reel
MMBT9018G/H SOT-23 Tape & Reel


  • Low-cost, industry-standard crystal unit
  • AT-Cut strip crystal with hermetically sealed can
  • Frequency range 3.200MHz to 90.00MHz
  • Package height options available


HC-49S crystals share the same base outline as the industry standard HC49 crystal. The crystal uses at AT-cut strip crystal with an hermetically sealed can. HC-49S crystals provide a low cost source of system clock frequency.

Multilayer ceramic capacitors with silver/palladium (Ag/Pd)terminations have often been used in medical applications where non-magnetic components are required, for example in MRI equipment. The use of conventional nickel barrier terminations is not suitable due to nickel exhibiting magnetic properties.

However, RoHS requirements have dictated the use of lead-free solders, and the composition of these solders has resulted in an increase in soldering temperatures. This has caused solder leaching problems for the Ag/Pd termination, and meant alternative terminations have had to be found.

This copper barrier termination is offered with selected nonmagnetic C0G/NP0, High Q and X7R dielectrics, providing a fully non-magnetic component.

To view the data sheet, including the range of capacitance values, please click http://www.kingtronics.com/pdf/Kingtronics-Tantalum-and-Ceramic-Capacitors-Cross-Reference.pdf

Contact us

Tel: (86) 769 8118 8110
Tel: (852) 8106 7033
Fax: (852) 8106 7099
E-mail: info@kingtronics.com
Skype: kingtronics.sales
MSN: kingtronics-sales@hotmail.com
Web: www.Kingtronics.com


Kingtronics International Company was established in 1995 located in Dongguan City of China to handle all sales & marketing for factories located in Chengdu, Sichuan and Zhaoqing, Guangdong, China. In 1990, we established the first factory to produce trimming potentiometer and in 1999 we built up new factory in Zhao Qing, Guangdong. Now with around 850 workers, Kingtronics produce trimming potentiometers, dipped tantalum capacitors, multilayer ceramic capacitors, and diode & bridge rectifier. We sell good quality under our brand Kingtronics, and Kt, King, Kingtronics are our three trademarks. All our products are RoHS compliant, and our bridge rectifier have UL approval. Please visit our Products page, you could please download all our PDF datasheet and find cross reference for our Trimming Potentiometer and capacitors.

Tantalum and Ceramic Capacitors Cross Reference ↓ Download
Diodes & Rectifiers List(PDF: 97KB) ↓ Download
Trimming Potentiometer Cross Reference ↓Download

Meet Kingtronics in Moscow soon
Convention and Exhibition Centre,HongKong
Date: 13-16 October, 2019
Booth No.: 5G-C26

Meet Kingtronics in Munich soon
New Munich Trade Fair Centre, Germany
Date: 10-13 November, 2020
Booth No.: To be advised



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