PTCTL4MR250STE - Vishay Presicion Group

PTC Thermistors, Overload Protection

For Telecommunication

2381 66. 9..../PTCTL..R.....E

Vishay BCcomponents

www.vishay.com For technical questions, contact: nlr@vishay.com Document Number: 29070

34 Revision: 25-Jun-09

DESCRIPTION

Advanced developments in telephone 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 in specific telecom

applications.

FEATURES

•Wide resistance range in telecom area from 4 Ω

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 (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

•Compliant to RoHS directive 2002/95/EC and in

accordance to WEEE 2002/96/EC

APPLICATIONS

Over-temperature/over-load 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

Notes

(1) These types pass ITU-T K20-21-45 edition 2003 telecommunication protection recommendation

(2) UL 1434 approved types and compatible with UL1459 and GR1089

(3) These types are compatible with FTCSE 131

(4) MDF: Main Distribution Frame; C.O.: Central Office Switching; T.E.: Subscriber Terminal Equipment; S.B.: Set-top Box

SUBSCRIBER

LOOP

INTERFACE

CIRCUIT

(SLIC)

TRANSFORMER

voltage

clamp

PTC

MDF

SECONDARY

PROTECTION

PRIMARY

PROTECTION

(OPTIONAL)

subscriber

lines

+θ

PTC

+θ

+θ+θ

Typical telephone line showing where PTC thermistors

can be used for overcurrent protection.

ELECTRICAL DATA AND ORDERING INFORMATION

RESISTANCE MATCHING

(Ω)

VMAX.

(VRMS)

NON-TRIP

CURRENT

TRIP

CURRENT

MAX.

TRIP

TIME

at 1 A

IMAX.

VMAX. APPLICATION

AREA (4)

CATALOG NUMBER

R25

(Ω)

TOL.

(%)

Int

(mA)

at T

(°C)

(mA)

at T

(°C)

tMAX.

(s)

IMAX.

(A) 12NC SAP CODING

25 ± 20 1.0 220 70 70 200 25 2.5 4.0 C.O. 2381 661 93048 (1) PTCTL4MR250GTE (1)

10 ± 20 1.0 230 100 70 250 25 3.0 2.0 MDF; ISDN 2381 661 93147 (1) PTCTL3MR100GTE (1)

33 ± 20 1.5 245 75 70 150 10 1.2 1.0 C.O. 2381 661 93037 PTCTL3MR330GTE

25 ± 15 no 245 70 70 200 25 5.0 2.6 C.O. 2381 661 93175 (1) (3) PTCTL4NR250GTE (1) (3)

16 ± 20 no 245 140 55 270 25 8.0 1.6 T.E. 2381 662 93081 (1) (3) PTCTL6NR160GTE (1) (3)

10 ± 20 no 245 140 55 270 25 8.0 2.0 T.E. 2381 662 93074 (1) (3) PTCTL6NR100GTE (1) (3)

25 ± 20 1.0 250 70 70 175 25 1.3 3.2 MDF; C.O. 2381 661 93148 (1) PTCTL3MR250HTE (1)

10 ± 20 no 250 100 70 450 0 40.0 10.0 T.E. 2381 663 93025 (1) PTCTL8NR100HBE (1)

8 ± 25 0.5 285 135 95 400 25 6.0 0.6 MDF; ISDN 2381 661 93078 (1) PTCTL4MR080JBE (1)

16 ± 25 no 300 100 70 250 25 2.0 2.6 MDF; T.E. 2381 661 93121 (1) PTCTL3NR160KTE (1)

10 ± 20 no 350 100 70 270 25 4.0 1.0 T.E.; S.B. 2381 661 93124 (1) PTCTL4NR100LBE (1)

10 ± 20 1.0 350 100 70 270 25 4.0 1.0 C.O. 2381 661 93146 (1) PTCTL4MR100LTE (1)

50 ± 20 1.0 600 50 70 140 25 1.0 1.0 C.O. 2381 661 93135 (1) PTCTL4MR500SBE (1)

35 ± 20 3.0 600 70 70 600 0 3.0 1.0 C.O. 2381 661 93056 (1) PTCTL4MR350STE (1)

25 ± 20 0.5 600 70 70 170 25 2.5 2.0 C.O. 2381 661 93139 (1) PTCTL4MR250STE (1)

25 ± 20 0.5 600 70 70 170 25 5.0 2.0 C.O. 2381 662 93129 (1) PTCTL6MR250STE (1)

10 ± 20 0.5 600 175 25 400 25 7.0 1.0 C.O. 2381 662 93114 (2) PTCTL7MR100SBE (2)

10 ± 20 no 600 175 25 400 25 7.0 1.0 T.E.; S.B. 2381 662 93131 (2) PTCTL7NR100SBE (2)

2381 66. 9..../PTCTL..R.....E

PTC Thermistors, Overload Protection

For Telecommunication Vishay BCcomponents

Document Number: 29070 For technical questions, contact: nlr@vishay.com www.vishay.com

Revision: 25-Jun-09 35

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 Ω 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 VRMS 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.

PTC THERMISTORS IN BULK

COMPONENT DIMENSIONS

MAX.

(mm)

MAX.

(mm)

MAX.

(mm)

PACKAGING (1) (2) CATALOG NUMBER

TYPE SPQ 12NC SAP CODING

8.5 5.0 1.5 to 3.0 - 11.5 16 Taped on reel 1500 2381 661 93048 PTCTL4MR250GTE

7.0 4.0 2.0 ± 0.5 - 9.8 18 Taped on reel 1500 2381 661 93147 PTCTL3MR100GTE

7.0 5.0 1.5 to 3 - 10.0 16 Taped on reel 1500 2381 661 93037 PTCTL3MR330GTE

8.3 4.0 1.5 to 3.0 - 11.0 18 Taped on reel 1500 2381 661 93175 (3) PTCTL4NR250GTE (3)

11 4.5 4.0 ± 1.0 - 15.5 16 Taped on reel 1500 2381 662 93081 PTCTL6NR160GTE

11 4.5 4.0 ± 1.0 - 15.5 16 Taped on reel 1500 2381 662 93074 (3) PTCTL6NR100GTE (3)

7.0 4.0 2.0 ± 0.5 - 9.8 18 Taped on reel 1500 2381 661 93148 PTCTL3MR250HTE

13.6 6.0 4.0 ± 1.0 20 ± 4.0 18.6 - Bulk 200 2381 663 93025 (3) PTCTL8NR100HBE (3)

8.3 5.0 1.5 ± 0.5 20 ± 3.0 10.3 - Bulk 250 2381 661 93078 PTCTL4MR080JBE

7.0 4.0 2.5 ± 0.5 - 10.0 16 Taped on reel 1500 2381 661 93121 PTCTL3NR160KTE

2381 66. 9..../PTCTL..R.....E

Vishay BCcomponents PTC Thermistors, Overload Protection

For Telecommunication

www.vishay.com For technical questions, contact: nlr@vishay.com Document Number: 29070

36 Revision: 25-Jun-09

Notes

(1) Taped in accordance with “IEC 60286-2”

(2) Naked disc ceramic for substrate mounting, available on request

(3) Insulated version is also available

PTC THERMISTORS TAPE ON REEL ACCORDING IEC 60286-2

8.5 4.0 2.5 ± 0.5 4.1 ± 0.5 11.5 - Bulk 500 2381 661 93124 PTCTL4NR100LBE

8.5 4.0 2.5 ± 0.5 - 11.5 16 Taped on reel 1500 2381 661 93146 PTCTL4MR100LTE

8.5 4.0 2.5 ± 0.5 4.1 ± 0.5 11.5 - Bulk 500 2381 661 93135 PTCTL4MR500SBE

8.0 5.0 2.5 ± 0.5 - 11.0 16 Taped on reel 1500 2381 661 93056 PTCTL4MR350STE

8.5 4.0 2.0 ± 0.5 - 11.0 16 Taped on reel 1500 2381 661 93139 PTCTL4MR250STE

10.5 5.0 2.0 ± 0.5 - 12.6 16 Taped on reel 1500 2381 662 93129 PTCTL6MR250STE

13 5.5 4.0 ± 1.0 20 min. 18.0 - Bulk 200 2381 662 93114 PTCTL7MR100SBE

13 5.5 4.0 ± 1.0 20 min. 18.0 - Bulk 200 2381 662 93131 PTCTL7NR100SBE

TAPE AND REEL ACCORDING TO IEC60286-2 DIMENSIONS in millimeters

SYMBOL PARAMETER DIMENSIONS TOLERANCE REMARKS

d Lead diameter 0.6 ± 10 %

P Pitch between thermistors 12.7 ± 1

F Lead to lead distance 5 + 0.6 to - 0.1 Guaranteed between component and tape

H2 Component body to seating plane 4 ± 1

H0Lead-wire clinch height See table ± 0.5

COMPONENT DIMENSIONS

MAX.

(mm)

MAX.

(mm)

MAX.

(mm)

PACKAGING (1) (2) CATALOG NUMBER

TYPE SPQ 12NC SAP CODING

Dimensions of the reel

0 P1

F D

D h

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www.vishay.com Vishay

Revision: 12-Mar-12 1Document Number: 91000

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