jbcapacitors blog

Specialized in manufacturing full series of Plastic Film Capacitors & Snap-in, Screw & Lug type Aluminum Electrolytic Capacitors. These products have been widely using in consumer's electronics, data processing, telecommunication, and industrial control's equipments. It is our commitment to offer our customers the best quality products with fast delivery and the best after sales services.

jb Capacitors has been producing film capacitors since 1980. We offer all kinds of film capacitors, polyester, polypropylene, polystyrene, epoxy dipped type, box type,X2, X1 class, high voltage film capacitors up to 2000VDC, besides winding

technology and stacked technology are both available. Our film capacitors are famous for high quality, short lead time and very competitive prices

jb Capacitors produces many kinds of motor starting capacitors, with high safety, high reliability, low dissipation factor and low temperature rise.

jb Capacitors has 30 years production experience on large can (snap in, screw, and lug  type) aluminum electrolytic capacitors. We sell top quality with reasonable prices.

Our SMD aluminum electrolytic capacitors 105'C and 85'C lead time is very short and  rices are the best in the market. Monthly output for SMD electrolytic capacitors can meet 30 millions.

Jun, 1980, founded in Tainan, Taiwan to produce Plastic Film Capacitors.

Feb, 1982, started to produce Snap-in, Screw & Lug type Aluminum Electrolytic Capacitors.

Dec, 1984, established sales office and warehouse in Hong Kong Located in N.T., HK

July, 1987, moved to China and built up joint venture in Hefei, Anhui Province, China.

Dec, 1988, started production of Snap-in, Screw & Lug Aluminum Electrolytic Capacitors in China.

Aug, 1993, jb Capacitors became sole proprietorship enterprise in China.

Jun, 2003, jb Capacitors set up sales office in Dongguan, Guangdong Province, China.

March, 2005, started to produce SMD Aluminum Capacitors.

From 2010, mini box type stacked metallized polyester film capacitors lead time became longer & Longer,  at the end of 2010, some suppliers lead time was more than 80 weeks or even allocation. Customers are desperate for these parts, seems the price is not so important then.

In order to meet many customers' needs, jb capacitors have done many efforts to improve the lead time of our JFJ series mini box 5mm MKT capacitor. Currently we offer 5-6 weeks lead time.

Short lead time can help customers win more opportunities & projects! Welcome to send your urgent inquiry & order to us. :)
JFJ-Mini box stacked metallized polyester film capacitor
Datasheet: http://www.jbcapacitors.com/pdf/JFJ-Mini-Box-Stacked-Metallized-Polyester-Film-Capacitor.pdf
Pitch size: 5mm mini size,Cross Arcotronics(Kemet) R82 series, Vishay MKT370 series, Epcos: B32529 series, etc..

• JFA--Mylar polyester film capacitors
• JFB--Metallized polyester film capacitors
• JFL--Metallized polypropylene film capacitors
• JFG--Axial lead film capacitor
• JFV--X2 metallized polypropylene film capacitors
• JFR--Radial & Axial Polystyrene film capacitors
• JFP--High voltage metallized polypropylene cap.
• JFQ--Double sided metallized polypropylene cap.
• JFS--Motor starting film capacitors
• JFX--Premium metallized polypropylene Cap.
• JCS--85°C SMD electrolytic capacitor
• JCK--105°C SMD electrolytic capacitor

1.High quality commitment
2.Competitive prices, professional factory
3.Fast lead time
4.Strong sales & technical support, quick response

Jun, 1980, founded in Tainan, Taiwan to produce Plastic Film Capacitors.
Feb, 1982, started to produce Snap-in, Screw & Lug type Aluminum Electrolytic Capacitors.
Dec, 1984, established sales office and warehouse in Hong Kong Located in N.T., HK
July, 1987, moved to China and built up joint venture in Hefei, Anhui Province, China.
Dec, 1988, started production of Snap-in, Screw & Lug Aluminum Electrolytic Capacitors in China.
Dec, 1988, started production of Snap-in, Screw & Lug Aluminum Electrolytic Capacitors in China.
Aug, 1993, jb Capacitors became sole proprietorship enterprise in China.
Jun, 2003, jb Capacitors set up sales office in Dongguan, Guangdong Province, China.
March, 2005, started to produce SMD Aluminum Capacitors.

Aluminum is used for the electrodes by using a thin oxidization membrane. Large values of capacitance can be obtained in comparison with the size of the capacitor, because the dielectric used is very thin. The most important characteristic of electrolytic capacitors is that they have polarity. They have a positive and a negative electrode.[Polarised] This means that it is very important which way round they are connected. If the capacitor is subjected to voltage exceeding its working voltage, or if it is connected with incorrect polarity, it may burst. It is extremely dangerous, because it can quite literally explode. Make absolutely no mistakes.

Generally, in the circuit diagram, the positive side is indicated by a "+" (plus) symbol.

Electrolytic capacitors range in value from about 1µF to thousands of µF. mainly this type of capacitor is used as a ripple filter in a power supply circuit, or as a filter to bypass low frequency signals, etc. Because this type of capacitor is comparatively similar to the nature of a coil in construction, it isn't possible to use for high-frequency circuits. (It is said that the frequency characteristic is bad.)

Description :

1. High frequency operation.
2. High du / dt.
3. High insulation resistance.
4. Flame retardant epoxy resin (UL 94V-0).

Specification :

1. Operating temperature: -40℃~+100℃.
2. Capacitance range: 0.0022μF~1μF.
3. Capacitance tolerance: ±10% (K).
4. Rated voltage: 300V, 280V, 275V. 250V.AC
5. Dissipation factor: 0.08% max at 1KHz 20℃ 0.3% max at 10KHz 20℃.
6. Insulation resistance: 1.R≥30,000MΩ (C≤0.33μF) 1.R≥10,000MΩ (C>0.33μF)

These Metallized Polypropylene Capacitors are specifically designed for high current, high frequency applications like switching power supplies. Film capacitors offer a much higher degree of reliability and stability than other types of capacitors. Polypropylene capacitors are non-polar, they come in the all case styles, including Wrap & Fill, Epoxy Case, and Metal Hermetically Sealed.

Metallized Polypropylene capacitors have high current end terminations to handle high pulse currents as well as high RMS currents. Detailed specifications as well case sizes for our standard Axial Wrap & Fill are linked www.jbcapacitors.com For custom designs please contact our sales with your specific requirements as we specialize in custom made capacitors.

All capacitors have a voltage rating. This tells you how much voltage the dielectric (insulator) can withstand before allowing DC to pass between its plates. Sometimes a capacitor has a working voltage (i.e. WVDC working voltage DC) and a surge voltage. The working voltage tells you how much voltage the capacitor can withstand long term (for the normal life of the capacitor). The surge voltage is the voltage is can withstand for short periods of time. Generally, if too much voltage is applied to a capacitor, it will fail. In electrolytic capacitors, the forming voltage (voltage used to anodize the plates) and the thickness of the paper element determine the working voltage of the cap. In film type capacitors, the insulating material (polyethylene, polypropylene...) will determine the maximum working voltage.