2322 66. 9.... Vishay BCcomponents PTC Thermistors, Overload Protection For Telecommunication FEATURES PRIMARY PROTECTION (OPTIONAL) +θ • • • • SECONDARY PROTECTION +θ PTC subscriber lines PTC voltage clamp +θ +θ SUBSCRIBER LOOP INTERFACE CIRCUIT (SLIC) OR TRANSFORMER PTC • • • • CCB913 MDF Typical telephone line showing where PTC thermistors can be used for overcurrent protection. Wide resistance range in telecom area 4... to 70 Ω Fast protection against power contact faults Withstand high overload currents of up to 10 A High voltage withstanding capabilities for the larger sized thermistors Good tracking over a wide temperature range for all matched or binned types UL1434 approved types available (XGPU2) Excellent stability over extended time All telecom PTCs are coated with a high temperature silicon lacquer (UL94V0) to protect them from any harsh environments and to improve their lifetime. APPLICATIONS • • • • DESCRIPTION Advanced developments in telephony equipment in recent years have radically altered the protection requirements for both exchange and subscriber equipment. The Vishay BCcomponents range of Positive Temperature Coefficient (PTC) thermistors includes devices specially designed to provide overcurrent protection. Main Distribution Frame (MDF) Central Office Switching (C.O.) Subscriber Terminal Equipment (T.E.) Set-top box (S.B.). MARKING Clear marking on a grey coated body. BC and R25 value. ELECTRICAL DATA AND ORDERING INFORMATION V MAX. (V) NON-TRIP CURRENT Int (mA) at T (°C) RESISTANCE MATCHED PAIRS R25 (Ω ) TOL (%) TRIP CURRENT It (mA) at T (°C) MAX. TRIP TIME at 25 °C tt (s) APPLICATION AREA(1) COMPATIBILITY at It (mA) ±20 1Ω 200 25 2.5 1000 C.O. K20/21 220 70 70 25 230 100 70 10 ±20 1Ω 250 25 3 1000 MDF; ISDN K20/21 245 60 70 70 +10/−15 no 180 25 60 220 C.O. − 245 75 70 33 ±20 ±5% 150 10 1.2 1000 C.O. − 245 70 70 25 ±15 no 200 25 20 400 C.O. K20/21; FTCSE I31-24 245 65 85 25 ±20 2% 200 25 3.40 650 C.O. K20/21 ±20 no 270 25 8 1000 T.E. K20/21; FTCSE I31-21 245 140 55 16 245 140 55 10 ±20 no 270 25 8 1000 T.E. K20/21; FTCSE I31-21 250 100 40 20 +10/−20 1Ω 220 25 1 1 000 MDF − 250 70 70 25 ±20 1Ω 175 25 1.3 1 000 MDF; C.O. K20/21 ±20 no 450 0 0.30 8 000 T.E. K20/21 250 100 70 10 285 135 95 8 ±25 0.5 Ω 400 25 6 1000 MDF; ISDN K20/21 300 100 70 16 ±25 no 250 25 2.0 1000 MDF; T.E. K20/21 350 100 70 10 ±20 no 270 25 4.0 1000 T.E.; S.B. K20/21 ±20 1Ω 270 25 4.0 1000 C.O. K20/21 350 100 70 10 600 50 70 50 ±20 1Ω 140 25 1 1000 C.O. K20/21 600 70 70 35 ±20 3Ω 600 0 3 1000 C.O. K20/21 600 70 70 25 ±20 2% 170 25 4 700 C.O. K20/21 600 70 70 25 ±20 2% 170 25 8 700 C.O. K20/21 600 175 25 10 ±20 0.5 Ω 400 25 7 1000 C.O. UL1459/GR1089 ±20 no 400 25 7 1000 T.E.; S.B. UL1459/GR1089 600 175 25 10 Notes 1. MDF: Main Distribution Frame; C.O.: Central Office Switching; T.E.: Subscriber Terminal Equipment; S.B.: Set-top Box. CATALOG NUMBER 2322 ... ..... 661 93048 661 93147 661 93025 661 93037 661 93175 661 93142 662 93081 662 93074 661 93118 661 93148 663 93025 661 93078 661 93121 661 93124 661 93146 661 93135 661 93056 661 93139 662 93129 662 93114(2) 662 93131(2) 2. UL 1434 approved types. Document Number: 29070 Revision: 10-Oct-03 For technical questions contact: [email protected] www.vishay.com 163 2322 66. 9.... Vishay BCcomponents PTC Thermistors, Overload Protection For Telecommunication 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. DIMENSIONS in millimeters T D COMPONENT OUTLINE D T H3 H2 For dimensions see Specific Physical Dimentions and Packaging table. F L1 Lead pitch F = 5 mm +0.6/-0.1. Lead thickness d = 0.6 mm ±10%. d CCB914 SPECIFIC PHYSICAL DIMENSIONS AND PACKAGING in millimeters D MAX. T MAX. H2 L1 H3 MAX. PACKAGING(1)(2) CATALOG NUMBER 2322 ... ..... 7.0 8.5 7.0 6.7 7.0 8.3 6.8 11 11 6.7 7.0 13.6 8.3 4.0 5.0 4.0 4.0 5.0 4.0 4.3 4.5 4.5 1.8 4.0 6.0 5.0 3.5 ±0.5 1.5 to 3.0 2.0 ±0.5 1.5 to 3.0 1.5 to 3 1.5 to 3.0 1.5 to 3.0 4.0 ±1.0 4.0 ±1.0 − 2.0 ±0.5 4.0 ±1.0 1.5 ±0.5 − − − − − − − − − − − 20 ±4.0 20 ±3.0 11.0 11.5 9.8 10.0 10.0 11.0 10.1 15.5 15.5 − 9.8 18.6 10.3 taped H0 = 16 mm taped H0 = 16 mm taped H0 = 18 mm taped H0 = 18 mm taped H0 = 16 mm taped H0 = 18 mm taped H0 = 16 mm taped H0 = 16 mm taped H0 = 16 mm disc on tray taped H0 = 18 mm bulk bulk 661 91066 661 93048 661 93147 661 93025 661 93037 661 93175(3) 661 93142 662 93081 662 93074(3) 661 93118 661 93148 663 93025(3) 661 93078 www.vishay.com 164 For technical questions contact: [email protected] Document Number: 29070 Revision: 10-Oct-03 2322 66. 9.... PTC Thermistors, Overload Protection For Telecommunication Vishay BCcomponents D MAX. T MAX. H2 L1 H3 MAX. PACKAGING(1)(2) CATALOG NUMBER 2322 ... ..... 7.0 8.5 8.5 8.5 8.0 8.5 10.5 13 13 4.0 4.0 4.0 4.0 5.0 4.0 5.0 5.5 5.5 2.5 ±0.5 2.5 ±0.5 2.5 ±0.5 2.5 ±0.5 2.5 ±0.5 2.0 ±0.5 2.0 ±0.5 4.0 ±1.0 4.0 ±1.0 − 4.1 ±0.5 − 4.1 ±0.5 − − − 20 min. 20 min. 10.0 11.5 11.5 11.5 11.0 11.0 12.6 18.0 18.0 taped H0 = 16 mm bulk taped H0 = 16 mm bulk taped H0 = 16 mm taped H0 = 16 mm taped H0 = 16 mm bulk bulk 661 93121 661 93124 661 93146 661 93135 661 93056 661 93139 662 93129 662 93114 662 93131 Notes 1. Taped in accordance with “IEC 60286-2” ; standard packaging: 1500 units/reel. 2. Naked disc ceramic for substrate mounting, available on request. 3. Insulated version is also available. PACKAGING All tape and reel specifications are in accordance with “IEC 60286-3”. Basic dimensions are given in the drawing below, the Dimensions of the Reel drawing, and tape and other Devices and Reel Dimensions tables. TAPE SPECIFICATIONS Thermistors with ∅D ≤ 12 mm on tape for 2322 66. 9.... P D T ∆p ∆h ∆p ∆h For dimensions, see Tape and other Devices table. H3 0 0.2 H2 H1 15 o 5 o d H0 W2 L W1 W0 W MBE473 D0 P0 P1 F t T TAPE AND OTHER DEVICE DIMENSIONS in millimeters SYMBOL PARAMETER DIMENSIONS D body diameter T d P total maximum thickness lead diameter pitch between thermistors: ∅ < 12 mm ∅ ≥ 12 mm feed hole pitch feed hole centre to lead centre component alignment P0 P1 ∆h Document Number: 29070 Revision: 10-Oct-03 TOLERANCE REMARKS see Specific Physical ±0.5 Dimensions table see Specific Physical Dimensions table 0.6 ±10% 12.7 25.4 12.7 3.81 0 ±1 ±2 ±0.3 ±0.7 ±1.3 cumulative pitch error ±1 mm/20 pitches guaranteed between component and tape For technical questions contact: [email protected] www.vishay.com 165 2322 66. 9.... Vishay BCcomponents PTC Thermistors, Overload Protection For Telecommunication SYMBOL F ∆h W W0 W1 W2 H1 H2 H3 H0 D0 t L PARAMETER lead to lead distance component alignment tape width hold down tape width hole position hold down tape position component height component body to seating plane component top to seating plane lead-wire clinch height feed hole diameter total tape thickness length of snipped lead DIMENSIONS TOLERANCE 5 +0.6 to −0.1 0 ±2 18 +1 to −0.5 ≥12.3 − 9 ±0.5 ≤3.0 − see Specific Physical Dimensions table 4 ±1 see Specific Physical Dimensions table 16 ±0.5 4 ±0.2 ≤0.9 − ≤11 − REMARKS guaranteed between component and tape with cardboard tape 0.5 ±0.1 mm CHARACTERISTICS CONCERNING TAPED THERMISTORS PARAMETER VALUE Minimum pull out force of the component Minimum pull off force of adhesive tape Minimum tearing force tape Maximum pull off force tape-reel Storage conditions Storage temperature range Maximum relative humidity 5N 6N 15 N 5N −25 to +40 °C 80% REEL SPECIFICATIONS in millimeters Dimensions of the reel for 2322 66. 6...1/2/3 For W1 and W2, see Reel Dimensions table 3 18 30 +1 −0 77 85.6 92 356 max. 22.5 CCB614 W1 W2 REEL DIMENSIONS in millimeters www.vishay.com 166 DIAMETER ∅ W1 <12 42 ±1 W2 MAX. 56 12 46 ±1 60 For technical questions contact: [email protected] Document Number: 29070 Revision: 10-Oct-03