Circuit & System Protection


Latest Articles

EMI filter simulator now has new features
25 September 2002
Simulation of differential mode circuits has been added to Murata's EMI filter simulator. New features include rapid differential transmission circuits for USB, IEEE-1394 and LVDS interfaces, ceramic ...

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Protection for T1/E1/E3 systems with low-voltage triple TISP
25 September 2002
Bourns has introduced the TISP70xxD series of thyristor integrated surge protectors. With high-speed data access systems gaining more importance in the modern world of telecommunications, Bourns has developed ...

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Fuses for telecom circuits
25 September 2002
Bourns has introduced a telecom fuse that enhances its substantial circuit protection offering. The model B1250T Telefuse is a powercross protection fuse designed for use in telecommunications circuit ...

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Filtered D-Sub with power/signal contacts
25 September 2002
Amphenol offers its Filter Combo D-Sub, 5W5 arrangement with fixed machine contacts and a zinc die cast cover. With Amphenol's stress isolated and solderless design, the company says it is able to manufacture ...

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ISDN surge protector
25 September 2002
The MJ8 2RN module is designed to protect ISDN subscriber terminals (TO/SO level, basic access). The MJ8 2RN from Citel uses standard ISDN connections (RJ45 modular jack), allowing instant installation. The ...

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Fused shuttered outlet type 4719
25 September 2002, Retron
Schurter's new type 4719 offers what is believed to be the world's first fused shuttered outlet. It is a highly compact module with the advantage of an integrated fuseholder and neon indicator to save ...

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Overtemperature protection for semiconductors
10 September 2002
Over-heating of power transistors, diodes, ICs and circuits can be prevented with a new 0603-sized chip from Murata. Murata's PTC thermistor has a 1,6 x 0,8 mm footprint and is under 1,0 mm high. Nominal ...

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How to improve insertion loss performance of surface mount Pi-filters
14 August 2002, TRX Electronics
One of the reasons a surface mount EMI filter does not give as good an insertion loss as panel mount types at high frequencies (100 MHz to 1 GHz), is that the interference (EMI) on the track leading to ...

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Resettable fuse rated to 33 V
14 August 2002
Bourns has launched a series of 33 V polymeric positive temperature coefficient (PPTC) fuses. The MF-SM100/33V, SM150/33V and SM185/33V provide overcurrent protection and offer design flexibility for ...

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Devices keep automotive voltages under control
17 July 2002, Electrocomp
In addition to the existing AUTO series of disk varistors for automotive voltages of 12 and 24 V, EPCOS has now developed the 42 V PowerNet series for the future 42 V automotive power supply system. They ...

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The complexities of board-level shielding
19 June 2002
When measuring shielding effectiveness, designers must take all issues into account. The last five years or so has seen an increase in the use of the board-level shield, thanks to cost and size constraints ...

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Quad USB 2.0 data line protection device
5 June 2002
The industry's first 4-line protection device to meet the stringent USB 2.0 requirements for high-speed data lines used in computing has been announced by ON Semiconductor. Claimed to deliver a line-to-line ...

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PC board fuseholders
5 June 2002, Actum
Developed specifically for use on PCBs, Pudenz's FLR type fuseholders are a logical answer to reduced space availability due to ever-increasing product miniaturisation. The advantage over existing G-type ...

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Single and dual EMI filters with ESD protection
8 May 2002
On Semiconductor's NZF220TT1, NZF220DFT1 are low-pass filters that eliminate or reduce high frequency signal or high-speed transients from the main signal. They offer transient overvoltage protection ...

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Surge arresters with pluggable 40 kA protection
8 May 2002, Surge Technology
Surge Technology's locally-manufactured DEHNguard-T lightning surge arresters are DIN-rail mounted and can withstand surge currents of up to 40 kA. The pluggable units consist of a base section which, ...

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Why not all transient voltage surge suppressors are the same
24 April 2002
Research indicates that up to 80% of voltage surges come from internal sources such as motors, fluorescent lights, photocopies and other switching devices

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Comparison of technologies used in surge protection devices
24 April 2002
The solutions employed to protect low voltage networks against transient overvoltages induced by lightning strikes - surge protection devices (SPDs) - are now widely spread. However, the choice between ...

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Lightning surge protectors
24 April 2002
A new lightning surge protector from Webb Industries has been introduced to protect sensitive equipment. The PolyPhaser DSX-D surge protector is designed to work from 0,8 to 2,2 GHz and is fully weatherised. ...

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Miniature multilayer varistors
24 April 2002
BCcomponents has extended its popular range of varistors when it launched the new smaller 0603 size multilayer varistor (MLV). This MLV is designed for surge suppression applications and electrostatic ...

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Dual element transient voltage suppressors
24 April 2002
Offering design engineers the ultimate in high density circuit protection, AVX introduced a dual-element 0405 MultiGuard multilayer ceramic TVS array. This line of surface mount chips offer the equivalent ...

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