Datenblatt-Suchmaschine für elektronische Bauteile |
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232266293074 Datenblatt(PDF) 2 Page - Vishay Siliconix |
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232266293074 Datenblatt(HTML) 2 Page - Vishay Siliconix |
2 / 4 page 2322 66. 9.... Vishay BCcomponents PTC Thermistors, Overload Protection For Telecommunication www.vishay.com For technical questions contact: nlr.europe@vishay.com Document Number: 29070 164 Revision: 10-Oct-03 DIMENSIONS in millimeters COMPONENT OUTLINE For dimensions see Specific Physical Dimentions and Packaging table. Lead pitch F = 5 mm +0.6/-0.1. Lead thickness d = 0.6 mm ±10%. CCB914 T D T D d F L1 H2 H3 OVERCURRENT PROTECTION OF TELECOMMUNICATION LINES The PTC thermistor must protect the telephone line circuit against overcurrent which may be caused by the following examples: • Surges due to lightning strikes on or near to the line plant. • Short-term induction of alternating voltages from adjacent power lines or railway systems, usually caused when these lines or systems develop faults. • Direct contact between telephone lines and power lines. To provide good protection under such conditions a PTC thermistor is connected in series with each line, usually as secondary protection; see Typical Telephone Line drawing on page 1. However, even with primary line protection (usually a gas discharge tube), the PTC thermistor must fulfil severe requirements. Surge pulses of up to 2 kV can occur and in order to withstand short-term power induction the PTC thermistor must withstand high voltages. If the line has primary protection a 220 V to 300 V PTC thermistor is adequate. Without primary protection, however, a 600 V PTC device is necessary. Vishay BCcomponents manufacturers a range of PTC thermistors (see Electrical Data and Ordering Information Table ) covering both requirements. In the case of direct contact between the telephone line and a power line, the PTC thermistor must withstand very high inrush power at normal mains voltage. Under such conditions, overload currents of up to 10 A on a 230 V mains could occur for up to several hours. To handle this power, the resistance/temperature characteristic of the thermistor must have a very steep slope and the ceramic must be extremely homogeneous. In case of overcurrent due to short-term induction of alternating voltages, currents of several AMPs with voltages as high as 650 VRMS can be present for several seconds For standard high voltage applications, resistance values from 25 to 50 Ω are available. However, ISDN networks which carry high-frequency sound and vision, need lower line impedance. Telecommunication designers are therefore demanding high voltage thermistors with much lower R25 values, which places even greater demands on the manufacture of PTC thermistors. For these applications PTC thermistors which have a R25 value of 10 Ω with voltages in the 300 to 600 VRMS range are available. In a typical telephone line application, two PTC thermistors are used, one each for the tip and ring (or A and B) wire together with their series resistors. For good line balance it is important that the thermistor and resistor pairs are matched. On request, Vishay BCcomponents can supply matched or binned PTC thermistors with R25 values matched to as close as 0.5 Ω. SPECIFIC PHYSICAL DIMENSIONS AND PACKAGING in millimeters D MAX. T MAX. H2 L1 H3 MAX. PACKAGING(1)(2) CATALOG NUMBER 2322 ... ..... 7.0 4.0 3.5 ±0.5 − 11.0 taped H0 = 16 mm 661 91066 8.5 5.0 1.5 to 3.0 − 11.5 taped H0 = 16 mm 661 93048 7.0 4.0 2.0 ±0.5 − 9.8 taped H0 = 18 mm 661 93147 6.7 4.0 1.5 to 3.0 − 10.0 taped H0 = 18 mm 661 93025 7.0 5.0 1.5 to 3 − 10.0 taped H0 = 16 mm 661 93037 8.3 4.0 1.5 to 3.0 − 11.0 taped H0 = 18 mm 661 93175(3) 6.8 4.3 1.5 to 3.0 − 10.1 taped H0 = 16 mm 661 93142 11 4.5 4.0 ±1.0 − 15.5 taped H0 = 16 mm 662 93081 11 4.5 4.0 ±1.0 − 15.5 taped H0 = 16 mm 662 93074(3) 6.7 1.8 −−− disc on tray 661 93118 7.0 4.0 2.0 ±0.5 − 9.8 taped H0 = 18 mm 661 93148 13.6 6.0 4.0 ±1.0 20 ±4.0 18.6 bulk 663 93025(3) 8.3 5.0 1.5 ±0.5 20 ±3.0 10.3 bulk 661 93078 |
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