When Selecting your capacitor for your embedded products, do you have to consider:
• Electrical characteristics.
• Life cycle cost.
Panasonic Launches its Polymer Capacitors to the market, which provides a great technical solution for Embedded products.
Panasonic Polymer offer 4 advantages VS other product technologies.
The Polymer technology offers fantastic Frequency Characteristics.
Thanks to their ultra low ESR values, polymer capacitors have a low impedance neartheir resonance point (see Image Below). And lower impedance reduces AC ripple in power circuits.
Panasonic testing has revealed as much as a fivefold reduction in peak-to-peakvoltage changes when comparing polymer capacitors to conventional low-ESR tantalum capacitors.
With ceramic capacitors, capacitance drifts in response to temperature changes and DC bias.
Polymer capacitors have no such problem and remainstable over time .This stability is particularly important in industrial and automotive applications, which tend to experience fluctuations in operating temperatures. We’ve seen cases where elevated temperatures caused an effective capacitance loss of 90% or more for ceramic capacitors, meaning that the conventional capacitor.
Conventional electrolytic capacitors can suffer from safety issues that could cause them to short circuit and fail. The problem arises when electrical or mechanical stresses create defects or discontinuities in the oxide film that forms the capacitor’s dielectric. Polymer capacitors have a self-healing capability that eliminates this failure mode.
The repair takes place in response to the joule heating that occurs when a dielectric defect triggers a short circuit. The heating breaks the molecular chain of the conductive polymer near the defect, driving up its resistance and effectively forming a barrier against any current leaking from the electrode In the case of hybrid capacitors, an additional self-healing mechanism comes into play—because the liquid electrolyte causes current flow near the defect to reoxidize the aluminum. We have conducted numerous over-voltage tests to demonstrate the self-repairing nature of polymer and hybrid capacitors. One such test compared our SP-Cap polymer capacitors to a conventional tantalum-MnO2 capacitors. The polymer model withstood short currents as high as 7 amps, while the tantalum capacitor started smoking at 3 amps and ignited at 5 amps. This safety enhancement has important design and cost implications. Conventional tantalum capacitors are normally derated in use by 30 to 50% their labeled voltage to ensure that they operate safely. This derating, while a common and accepted engineering practice, results in an upsizing of capacitors and increased cost. For our polymer capacitors, by contrast, we guarantee operation at 90% of the full-rated voltage.
If your application/design needs, High Reliability, High Efficiency, Low ESR, High Ripple Current or your looking for a Smart Alternative to Tantalum Capacitors maybe you should consider using Panasonic Polymer.
Link For Samples: Capacitors | Power Capacitors | Farnell UK