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.
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.
Document Number: 29070
Revision: 15-Oct-04
ELECTRICAL DATA AND ORDERING INFORMATION
R
( Ω )
RESISTANCE
25
10
33
25
16
10
20
25
10
16
10
10
50
35
25
25
10
10
subscriber
8
25
lines
Typical telephone line showing where PTC thermistors
can be used for overcurrent protection.
+10/ − 20
MDF
TOL
± 20
± 20
± 20
± 15
± 20
± 20
± 20
± 20
± 25
± 25
± 20
± 20
± 20
± 20
± 20
± 20
± 20
± 20
(%)
PROTECTION
(OPTIONAL)
PRIMARY
MATCHING
+θ
+θ
PTC
1.0
1.0
1.5
1.0
1.0
0.5
1.0
1.0
3.0
0.5
0.5
0.5
no
no
no
no
no
no
no
Ω
PTC Thermistors, Overload Protection
PROTECTION
SECONDARY
+θ
+θ
voltage
clamp
PTC
PTC
(Vrms)
V
220
230
245
245
245
245
250
250
250
285
300
350
350
600
600
600
600
600
600
MAX.
For technical questions contact: nlr.europe@vishay.com
For Telecommunication
(mA)
100
140
140
100
100
135
100
100
100
175
175
70
75
70
70
50
70
70
70
TRANSFORMER
I
CURRENT
NON-TRIP
nt
SUBSCRIBER
INTERFACE
CIRCUIT
(SLIC)
LOOP
OR
CCB913
at T
( ° C)
70
70
70
70
55
55
40
70
70
95
70
70
70
70
70
70
70
25
25
TRIP CURRENT
(mA)
200
250
150
200
270
270
220
175
450
400
250
270
270
140
600
170
170
400
400
I
t
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
• Good tracking over a wide temperature range for all
• UL1434 approved types available (XGPU2)
• Excellent stability over extended time
• All telecom PTCs are coated with a high temperature
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.
thermistors
matched or binned types
silicon lacquer (UL94V0) to protect them from any harsh
environments and to improve their lifetime.
at T
( ° C)
25
25
10
25
25
25
25
25
25
25
25
25
25
25
25
25
25
0
0
MAX.
TIME
at 1A
TRIP
40.0
2.5
3.0
1.2
5.0
8.0
8.0
1.0
1.3
6.0
2.0
4.0
4.0
1.0
3.0
2.5
5.0
7.0
7.0
(s)
t
t
V
I
I
10.0
(A)
4.0
2.0
1.0
2.6
1.6
2.0
1.6
3.2
0.6
2.6
1.0
1.0
1.0
1.0
2.0
2.0
1.0
1.0
MAX.
MAX
at
MAX.
Vishay BCcomponents
APPLICATION
MDF; ISDN
MDF; ISDN
MDF; C.O.
MDF; T.E.
T.E.; S.B.
T.E.; S.B.
AREA
MDF
C.O.
C.O.
C.O.
C.O.
C.O.
C.O.
C.O.
C.O.
C.O.
T.E.
T.E.
T.E.
(4)
2322 66. 9....
661 93175
662 93081
662 93074
661 93048
661 93147
661 93148
663 93025
661 93078
661 93121
661 93124
661 93146
661 93135
661 93056
661 93139
662 93129
662 93114
662 93131
www.vishay.com
2322 ... .....
661 93037
661 93118
NUMBER
CODE
(1)(3)
(1)(3)
(1)(3)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(1)
(2)
(2)
163