PTC Thermistors, Overload Protection
For Telecommunication
2322 66. 9....

Vishay BCcomponents



Document Number: 29070 For technical questions contact: nlr.europe@vishay.com www.vishay.com
Revision: 10-Oct-03 163

FEATURES

•

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

•

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.

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.
CCB913
SUBSCRIBER
LOOP
INTERFACE
CIRCUIT
(SLIC)
OR
TRANSFORMER
voltage
clamp
PTC
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

Notes

1. MDF: Main Distribution Frame; C.O.: Central Office Switching; T.E.: Subscriber Terminal Equipment; S.B.: Set-top Box.
2. UL 1434 approved types.

V
MAX.
(V)
NON-TRIP
CURRENT
RESISTANCE
MATCHED
PAIRS
TRIP
CURRENT
MAX.
TRIP TIME
at 25

°

C
APPLICATION
AREA

(1)

COMPATIBILITY
CATALOG
NUMBER
2322 ... .....
I

nt

(mA)
at T
(

°

C)
R

25

(

Ω

)
TOL
(%)
I

t

(mA)
at T
(

°

C)
t

t

(s)
at I

t

(mA)

220 70 70 25

±

20 1

Ω

200 25 2.5 1000 C.O. K20/21 661 93048
230 100 70 10

±

20 1

Ω

250 25 3 1000 MDF; ISDN K20/21 661 93147
245 60 70 70 +10/

−

15 no 180 25 60 220 C.O.

−

661 93025
245 75 70 33

±

20

±

5% 150 10 1.2 1000 C.O.

−

661 93037
245 70 70 25

±

15 no 200 25 20 400 C.O. K20/21; FTCSE I31-24 661 93175
245 65 85 25

±

20 2% 200 25 3.40 650 C.O. K20/21 661 93142
245 140 55 16

±

20 no 270 25 8 1000 T.E. K20/21; FTCSE I31-21 662 93081
245 140 55 10

±

20 no 270 25 8 1000 T.E. K20/21; FTCSE I31-21 662 93074
250 100 40 20 +10/

−

20 1

Ω

220 25 1 1 000 MDF

−

661 93118
250 70 70 25

±

20 1

Ω

175 25 1.3 1 000 MDF; C.O. K20/21 661 93148
250 100 70 10

±

20 no 450 0 0.30 8 000 T.E. K20/21 663 93025
285 135 95 8

±

25 0.5

Ω

400 25 6 1000 MDF; ISDN K20/21 661 93078
300 100 70 16

±

25 no 250 25 2.0 1000 MDF; T.E. K20/21 661 93121
350 100 70 10

±

20 no 270 25 4.0 1000 T.E.; S.B. K20/21 661 93124
350 100 70 10

±

20 1

Ω

270 25 4.0 1000 C.O. K20/21 661 93146
600 50 70 50

±

20 1

Ω

140 25 1 1000 C.O. K20/21 661 93135
600 70 70 35

±

20 3

Ω

600 0 3 1000 C.O. K20/21 661 93056
600 70 70 25

±

20 2% 170 25 4 700 C.O. K20/21 661 93139
600 70 70 25

±

20 2% 170 25 8 700 C.O. K20/21 662 93129
600 175 25 10

±

20 0.5

Ω

400 25 7 1000 C.O. UL1459/GR1089 662 93114

(2)

600 175 25 10

±

20 no 400 25 7 1000 T.E.; S.B. UL1459/GR1089 662 93131

(2)