Circuit & System Protection


Latest Articles

5 x 20 fuse for SMT
28 February 2001, Retron
Why should one not use a 5 x 20 fuse as a SMD-component, if there is enough space for such a solution? Is it because of the missing heat resistance of the fuse during the soldering process? According ...

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Protecting modems against lightning discharges
14 February 2001, Electrocomp
Suitable protection modules matched to all regional conditions can be developed from surge arresters, varistors, inductors and capacitors

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Interference suppression capacitors with insulated leads
14 February 2001, Electrocomp
BCcomponents has extended its metallised polypropylene interference suppression film capacitor range with the new MKP 435 X2 series with insulated leads. This series is primarily intended for use in ...

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Suppression caps rated up to 440 V a.c.
14 February 2001, Electrocomp
The small dimensions of Bourns'MKP 338 1 X1 440 V a.c. series can offer a major boost to manufacturers committed to miniaturisation, especially in applications such as UPS-supplies and mains filters for ...

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GBIC fibre-optic shield
14 February 2001
Instrument Specialities has introduced the GBIC shield for reducing emissions from GBIC (GigaBit Interface Converter) fibre-optic transceivers. Fibre-optic transceivers can be a troublesome source of ...

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Contact strips for shielding enclosures from EMI/RFI
14 February 2001
Bavaria Elektronik has available contact strips used to close and thereby shield gaps between two surfaces. For optimum shielding performance, the contact strip must be in a position to span the min and ...

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Li+ battery-pack protector
22 November 2000, Altron Arrow
Linear Technology's LT 1405 12 bit, 5 MSa/s analog-to-digital converter (ADC) operates single 5 or ±5 V supplies with only 115 mW of power dissipation and features AC specs of 71,3 dB SINAD and 85 dB ...

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High frequency transformers and suppression chokes
22 November 2000
Prodigy Manufacturing offers a number of standard common mode and rod chokes for use in suppression of electromagnetic interference, for example, that caused by switch mode power supplies. If a standard ...

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Subminiature fuse-links save 65% space
22 November 2000, Retron
Schurter's FWF/FWT expands its existing range of subminiature fuse-links. In 125 V applications, these through-hole technology fuse-links offer efficient protection of electrical equipment and components ...

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One to four-pair surge protection boxes
22 November 2000
Citel's BPI unit is designed to protect terminals linked by one pair to telephone or data networks. The unit has a removable protection circuit (PIN S180...) which simplifies maintenance. The B280, ...

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Tiny thermal monitor for battery packs
22 November 2000, CST Electronics
With a digital temperature sensor, 64 bit ROM ID, 3,0 V to 5,5 V supply range, and 12 bit resolution, Dallas Semiconductor's DS18B20 one-wire digital thermometer is well-suited for battery pack applications. ...

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Application cameo - 4,5 µA protection circuit lengthens Li-ion battery life
22 November 2000
If a Li-ion battery discharges below the recommended end-of-discharge voltage, the cycle life shortens and the battery dies prematurely. Linear Technology describes the circuit in Figure 1 that monitors ...

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Dual SLIC protectors meet creepage requirements
22 November 2000, Altron Arrow
To help designers meet ground lead creepage, requirements being introduced by international safety standards such as IEC 60950 and UL1950, Power Innovations has introduced three enhanced versions of its ...

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Compact thermal supervisor with fan control
22 November 2000, MB Silicon Systems
Micrel Semiconductor has developed a two-zone thermal supervisor IC for thermal management using embedded thermal diodes such as those found in Intel's Pentium III CPU. The MIC284 is part of a growing ...

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Locating battery ground faults without sectionalising
25 October 2000
The AC injection test method measures fault resistance in the battery system without sectionalising the DC system.

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Resettable fuses improve reliability at lower cost
25 October 2000, Electrocomp
As PPTC fuses are resettable, warranty costs and service calls are largely avoided.

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Gas-filled surge arresters and varistors protect basestations
25 October 2000, Electrocomp
Interference-free mobile communications services must be available at all times

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Microwave absorbers
25 October 2000
With Murata's flexible absorbent materials, late design modifications can be avoided, says the company. Covering the frequency range from 0,1 to 2 GHz, they can be introduced at any stage in the sequence ...

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Poor ground plus good filtering?
25 October 2000
New developments by Murata have resulted in the new terminal capacitors for noise suppression in the GHz range, combined with a more than 50% reduction in the footprint. Two well-established families ...

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Protectors for modem applications
25 October 2000, Altron Arrow
The 275 V working and 350 V protection voltage of the TISP4350L3BJ meets class B ringer levels and enables protection of the modem ring hook-switch relay while the TISP4070L3BJ provides maximum protection ...

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