PTCTL www.vishay.com Vishay BCcomponents PTC Thermistors, Overload Protection for Telecommunication FEATURES Wide resistance range in telecom area from 4 to 70 Fast protection against power contact faults Withstand high overload currents of up to 10 A High voltage withstanding capabilities for the larger sized thermistors (up to 600 V) Good tracking over a wide temperature range for all matched or binned thermistors (matching at 85 C 2 x matching at 25 C) UL1434 approved types available (XGPU2) All telecom PTCs are coated with a high temperature silicon lacquer (UL 94 V-0) to protect them from any harsh environments and to improve their lifetime QUICK REFERENCE DATA Material categorization: for definitions of compliance PARAMETER VALUE UNIT please see www.vishay.com/doc 99912 Maximum voltage (RMS or DC) 220 to 600 V RMS Maximum holding current (I ) 100 to 175 mA APPLICATIONS nt Resistance at 25 C (R )8 to 50 25 Over-temperature/over-load protection: Tolerance on R value 15 to 25 % Main distribution frame (MDF) 25 Maximum overload current I 0.6 to 10.0 A Central office switching (C.O.) ol Subscriber terminal equipment (T.E.) Tripping time at 1 A 1 to 40 s Set-top box (S.B.) Operating temperature range 0 to 70 (95) C at max. voltage MARKING Clear marking on a gray coated body BC and R value 25 ELECTRICAL DATA AND ORDERING INFORMATION MAX. I max. NON-TRIP TRIP RESISTANCE TRIP TIME AT CURRENT CURRENT MATCHING V APPLICATION ORDERING PART max. at 1 A V max. (2) () (V ) AREA NUMBERS RMS t R TOL. I atT I atT I 25 nt t max. max. () (%) (mA) (C) (mA) (C) (S) (A) 25 20 1.0 220 70 70 200 25 2.5 4.0 C.O. PTCTL4MR250GTE 10 20 1.0 230 100 70 250 25 3.0 2.0 MDF ISDN PTCTL3MR100GTE 25 15 no 245 70 70 200 25 5.0 2.6 C.O. PTCTL4NR250GTE 16 20 no 245 140 55 270 25 8.0 1.6 T.E. PTCTL6NR160GTE 10 20 no 245 140 55 270 25 8.0 2.0 T.E. PTCTL6NR100GTE 25 20 1.0 250 70 70 175 25 1.3 3.2 MDF C.O. PTCTL3MR250HTE 10 20 no 250 100 70 450 0 40.0 10.0 T.E. PTCTL8NR100HBE 8 25 0.5 285 135 95 400 25 6.0 0.6 MDF ISDN PTCTL4MR080JBE 16 25 no 300 100 70 250 25 2.0 2.6 MDF T.E. PTCTL3NR160KTE 10 20 no 350 100 70 270 25 4.0 1.0 T.E. S.B. PTCTL4NR100LBE 10 20 1.0 350 100 70 270 25 4.0 1.0 C.O. PTCTL4MR100LTE 50 20 1.0 600 50 70 140 25 1.0 1.0 C.O. PTCTL4MR500SBE 35 20 3.0 600 70 70 600 0 3.0 1.0 C.O. PTCTL4MR350STE 25 20 0.5 600 70 70 170 25 2.5 2.0 C.O. PTCTL4MR250STE 25 20 0.5 600 70 70 170 25 5.0 2.0 C.O. PTCTL6MR250STE (1) 10 20 0.5 600 175 25 400 25 7.0 1.0 C.O. PTCTL7MR100SBE (1) 10 20 no 600 175 25 400 25 7.0 1.0 T.E. S.B. PTCTL7NR100SBE Notes All types pass ITU-T K20-21-45 telecommunication protection recommendation (1) UL 1434 approved types and compatible with UL1459 and GR1089 (2) MDF: Main Distribution Frame C.O.: Central Office Switching T.E.: Subscriber Terminal Equipment S.B.: Set-top Box Revision: 13-Nov-15 Document Number: 29070 1 For technical questions, contact: nlr vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc 91000 PTCTL www.vishay.com Vishay BCcomponents OVERCURRENT PROTECTION OF TELECOMMUNICATION LINES The PTC thermistor must protect the telephone line circuit In case of overcurrent due to short-term induction of against overcurrent which may be caused by the following alternating voltages, currents of several amperes with events: voltages as high as 650 V can be present for several RMS seconds. Surges due to lightning strikes on or near to the line plant. For standard high voltage applications, resistance values Short-term induction of alternating voltages from adjacent from 25 to 50 are available. However, ISDN networks power lines or railway systems, usually caused when which carry high-frequency sound and vision, need lower these lines or systems develop faults. line impedance. Direct contact between telephone lines and power lines. Telecommunication designers are therefore demanding To provide good protection under such conditions a PTC high voltage thermistors with much lower R values, which 25 thermistor is connected in series with each line, usually as places even greater demands on the manufacture of PTC secondary protection see Typical Telephone Line drawing thermistors. For these applications PTC thermistors which fig. 1. However, even with primary line protection (usually a have a R value of 10 with voltages in the 300 V to 25 RMS gas discharge tube), the PTC thermistor must fulfil severe 600 V range are available. RMS requirements. In a typical telephone line application, two PTC thermistors Surge pulses of up to 2 kV can occur and in order to are used, one each for the tip and ring (or A and B) wire withstand short-term power induction the PTC thermistor together with their series resistors. For good line balance it must withstand high voltages. If the line has primary is important that the thermistor and resistor pairs are protection a 220 V to 300 V PTC thermistor is adequate. matched. 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. PRIMARY SECONDARY PROTECTION PROTECTION (OPTIONAL) + + PTC PTC SUBSCRIBER LOOP INTERFACE subscriber voltage CIRCUIT lines clamp (SLIC) OR TRANSFORMER + + PTC MDF Fig. 1 - Typical telephone line showing where PTC thermistors can be used for overcurrent protection. Revision: 13-Nov-15 Document Number: 29070 2 For technical questions, contact: nlr vishay.com THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT www.vishay.com/doc 91000