SIOV Metal Oxide Varistors - DEMAR

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Selection Procedure Figure 15 shows approximate figures for the characteristic impedance of a supply line when there are high-frequency overvoltages. For calculation purposes the characteristic impedance is normally taken as being 50 Ω. Artificial networks and surge generators are designed accordingly. Figure 15 Impedance of a supply line for high-frequency overvoltages 38 Siemens Matsushita Components
Selection Procedure 2.3 Areas of application for varistors A wide selection of components is available to cover very different requirements for protective level and load capability. Straightforward conditions of use and an attractive price/performance ratio have made <strong>SIOV</strong>s from S+M successful in just about every area of electrical engineering and electronics. The table below summarizes them: Telecommunications Power engineering Data systems Private branch exchanges Transformers Data lines Telephone subscriber sets Inductors Power supply units Telephone pushbutton modules Motor and generator Personal computers Teleprinters windings Interfaces Answering sets Transmission line lightning Power supply units arresters Stepped protection Transmitting systems Microelectronics Fax machines Automotive electronics EMI/RFI suppression Modem Central protection of auto- EMP/NEMP protection Cellular (mobile) phones motive electrical systems Cordless phones Load-dump protection Entertainment electronics Anti-skid brake systems Video sets Industrial controls Trip recorders Television sets Telemetering systems Radios Slide projectors Remote control systems Motor controls Power supply units Machine controls Generator rectifiers HIFI equipment Elevator controls Central locking systems Alarm systems Trip computers Household electronics Proximity switches Wiper motors Washer controls Lighting controls Power window systems Dimmers Power supply units Airbag electronics Lamps Ground fault interrupters Carphones Quartz clocks Gas heating electronics Seat memories Electric motor tools Electronic ballasts Thermostats Traffic lighting Power electronics Traffic signals Bridge rectifiers Runway lighting Brake rectifiers Beacon lights Electric welding Electric vehicles Medical engineering Switch-mode power supplies Diagnostic equipment High-power current converters Therapeutic equipment DC/AC converters Power supply units Power semiconductors If semiconductor devices like diodes, thyristors and triacs are paralleled with <strong>SIOV</strong>s for protection, they may do with lower reverse-voltage strength. This leads to a marked cost reduction and can be the factor that really makes a circuit competitive. Siemens Matsushita Components 39
Page 1 and 2: SIOV Metal Oxide Varistors
Page 3 and 4: Type Survey SMD varistors Standard
Page 5 and 6: Type Survey Disk varistors Standard
Page 7 and 8: Type Survey Block varistors B32 Pag
Page 9 and 10: General Technical Information 1 Gen
Page 11 and 12: General Technical Information Grain
Page 13 and 14: General Technical Information 3a 3b
Page 15 and 16: General Technical Information 4a 4b
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SIOV Metal Oxide Varistors - DEMAR

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