Product category:
Capacitors
News Release from: Micromark C and CD | Subject: AVX BestCap
Edited by the Electronicstalk Editorial
Team on 26 June 2002
Supercapacitors deliver low ESR at high
pulserates
Designers can now achieve the energy, power and capacitance density of supercapacitors without the high ESR or loss of capacitance at high pulse repetition rates that hinder traditional devices.
Designers can now achieve the energy, power and capacitance density of supercapacitors without the high ESR or loss of capacitance at high pulse repetition rates that hinder traditional devices, with a new product available from Micromark C and CD The AVX BestCap range of electrochemical supercapacitors features a new aqueous chemistry that reduces ESR to milliohms compared with several ohms for traditional devices, and allows the parts to retain up to 65% of nominal capacitance when used with short pulses in the millisecond region
This article was originally published on Electronicstalk on 5 Jan 2006 at 8.00am (UK)
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Traditional supercapacitors can lose up to 98% of nominal value under such conditions.
BestCap saves space and extends battery life in products requiring short, high-current pulses.
These include RF modems for GSM or wireless local loop systems, ADSL/xDSL communication equipment, and other diverse products such as hearing aids, prosthetics or camera flash systems.
Further applications include wireless alarm systems, remote meter reading solutions, mainframe computer decoupling, hybrid battery packs, memory backup and laser systems.
In high pulse rate applications such as a GSM, the enhanced performance of BestCap minimises the instantaneous voltage drop that occurs with each current pulse to the RF amplifier.
This enables the amplifier to operate more efficiently, and maintains the voltage pulse above the cutoff value for a longer period, which extends the talk time of the product.
Depending on battery technology, ambient temperature and the cutoff level relative to the supply voltage, the talk time for a Li-ion battery can be extended by at least 28%, and a NiMH battery by at least 13%.
BestCap supercapacitors are available in standard values from 30 to 560mF, up to 12V rated voltage, and are completely nontoxic.
Leakage current less than 0.2uA/mF further enhances efficiency.
Two case sizes are offered: 28 x 17 and 48 x 30mm, and package height ranges from 2.1 to 6.5mm as the device rated voltage increases.
These small package outlines allow BestCap devices to address many small form factor applications, including the PCMCIA card standards.
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