Document Number: 29070 For technical questions contact: nlr.europe@vishay.com www.vishay.com
Revision: 15-Oct-04 163
PTC Thermistors, Overload Protection
For Telecommunication
2322 66. 9....
Vishay BCcomponents
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. 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.
RESISTANCE
MATCHING
Ω
V
MAX.
(Vrms)
NON-TRIP
CURRENT TRIP CURRENT
MAX.
TRIP
TIME
at 1A
I
MAX.
at
V
MAX.
APPLICATION
AREA
(4)
CODE
NUMBER
2322 ... .....
R
25
(
Ω
)
TOL
(%)
I
nt
(mA)
at T
(
°
C)
I
t
(mA)
at T
(
°
C)
t
t
(s)
I
MAX
(A)
25
±
20 1.0 220 70 70 200 25 2.5 4.0 C.O. 661 93048
(1)
10
±
20 1.0 230 100 70 250 25 3.0 2.0 MDF; ISDN 661 93147
(1)
33
±
20 1.5 245 75 70 150 10 1.2 1.0 C.O. 661 93037
25
±
15 no 245 70 70 200 25 5.0 2.6 C.O. 661 93175
(1)(3)
16
±
20 no 245 140 55 270 25 8.0 1.6 T.E. 662 93081
(1)(3)
10
±
20 no 245 140 55 270 25 8.0 2.0 T.E. 662 93074
(1)(3)
20 +10/
−
20 1.0 250 100 40 220 25 1.0 1.6 MDF 661 93118
25
±
20 1.0 250 70 70 175 25 1.3 3.2 MDF; C.O. 661 93148
(1)
10
±
20 no 250 100 70 450 0 40.0 10.0 T.E. 663 93025
(1)
8
±
25 0.5 285 135 95 400 25 6.0 0.6 MDF; ISDN 661 93078
(1)
16
±
25 no 300 100 70 250 25 2.0 2.6 MDF; T.E. 661 93121
(1)
10
±
20 no 350 100 70 270 25 4.0 1.0 T.E.; S.B. 661 93124
(1)
10
±
20 1.0 350 100 70 270 25 4.0 1.0 C.O. 661 93146
(1)
50
±
20 1.0 600 50 70 140 25 1.0 1.0 C.O. 661 93135
(1)
35
±
20 3.0 600 70 70 600 0 3.0 1.0 C.O. 661 93056
(1)
25
±
20 0.5 600 70 70 170 25 2.5 2.0 C.O. 661 93139
(1)
25
±
20 0.5 600 70 70 170 25 5.0 2.0 C.O. 662 93129
(1)
10
±
20 0.5 600 175 25 400 25 7.0 1.0 C.O. 662 93114
(2)
10
±
20 no 600 175 25 400 25 7.0 1.0 T.E.; S.B. 662 93131
(2)
www.vishay.com For technical questions contact: nlr.europe@vishay.com Document Number: 29070
164 Revision: 15-Oct-04
2322 66. 9....
Vishay BCcomponents
PTC Thermistors, Overload Protection
For Telecommunication
CCB914
T
DT
D
d
F
L1
H2
H3
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 V
RMS
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 R
25
values, which
places even greater demands on the manufacture of PTC
thermistors. For these applications PTC thermistors which
have a R
25
value of 10
Ω
with voltages in the
300 to 600 V
RMS
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 R
25
values matched to as close
as 0.5
Ω
.
COMPONENT DIMENSIONS AND PACKAGING
in millimeters
D
MAX.
(MM)
T
MAX.
(MM)
H
2
(MM)
L
1
(MM)
H
3
MAX.
(MM)
H
0
(MM)
PACKAGING
(1)(2)
CATALOG
NUMBER
2322 ... .....
TYPE S.P.Q. P.Q.
8.5 5.0 1.5 to 3.0
−
11.5 16 Taped on Reel 3,000 6,000 661 93048
7.0 4.0 2.0
±
0.5
−
9.8 18 Taped on Reel 3,000 6,000 661 93147
7.0 5.0 1.5 to 3
−
10.0 16 Taped on Reel 3,000 6,000 661 93037
8.3 4.0 1.5 to 3.0
−
11.0 18 Taped on Reel 3,000 6,000 661 93175
11 4.5 4.0
±
1.0
−
15.5 16 Taped on Reel 3,000 6,000 662 93081
11 4.5 4.0
±
1.0
−
15.5 16 Taped on Reel 3,000 6,000 662 93074
6.7 1.8
−−−−
disc on tray 5,600 5,600 661 93118
7.0 4.0 2.0
±
0.5
−
9.8 18 Taped on Reel 3,000 6,000 661 93148
13.6 6.0 4.0
±
1.0 20
±
4.0 18.6
−
Bulk 200 6,000 663 93025
8.3 5.0 1.5
±
0.5 20
±
3.0 10.3
−
Bulk 250 6,000 661 93078
7.0 4.0 2.5
±
0.5
−
10.0 16 Taped on Reel 3,000 6,000 661 93121
8.5 4.0 2.5
±
0.5 4.1
±
0.5 11.5
−
Bulk 500 6,000 661 93124
PTC THERMISTORS IN BULK
Document Number: 29070 For technical questions contact: nlr.europe@vishay.com www.vishay.com
Revision: 15-Oct-04 165
2322 66. 9....
PTC Thermistors, Overload Protection
For Telecommunication
Vishay BCcomponents
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.
8.5 4.0 2.5
±
0.5
−
11.5 16 Taped on Reel 3,000 6,000 661 93146
8.5 4.0 2.5
±
0.5 4.1
±
0.5 11.5
−
Bulk 500 6,000 661 93135
8.0 5.0 2.5
±
0.5
−
11.0 16 Taped on Reel 3,000 6,000 661 93056
8.5 4.0 2.0
±
0.5
−
11.0 16 Taped on Reel 3,000 6,000 661 93139
10.5 5.0 2.0
±
0.5
−12.6 16 Taped on Reel 3,000 6,000 662 93129
13 5.5 4.0 ±1.0 20 min. 18.0 −Bulk 200 6,000 662 93114
13 5.5 4.0 ±1.0 20 min. 18.0 −Bulk 200 6,000 662 93131
D
MAX.
(MM)
T
MAX.
(MM)
H2
(MM)
L1
(MM)
H3
MAX.
(MM)
H0
(MM)
PACKAGING(1)(2)
CATALOG
NUMBER
2322 ... .....
TYPE S.P.Q. P.Q.
PTC THERMISTORS ON TAPE ON REEL
P0
D
P
d
P1F
D0
L
W0
W1
W2
W
H0
H
T
1
H2
H3
∆p∆p
MBE473
15 5
oo
0
0.2
∆h∆h
t
T
TAPE AND REEL ACCORDING TO IEC60286-2 DIMENSIONS in millimeters
SYMBOL PARAMETER DIMENSIONS TOLERANCE REMARKS
D body diameter see table max.
T total maximum thickness see table max.
d lead diameter 0.6 ±10%
P
pitch between thermistors:
∅ < 12 mm 12.7 ±1
∅ ≥ 12 mm 25.4 ±2
P0feed hole pitch 12.7 ±0.3 cumulative pitch error ±1 mm/20 pitches
www.vishay.com For technical questions contact: nlr.europe@vishay.com Document Number: 29070
166 Revision: 15-Oct-04
2322 66. 9....
Vishay BCcomponents PTC Thermistors, Overload Protection
For Telecommunication
P1feed hole centre to lead centre 3.81 ±0.7 guaranteed between component and tape
∆h component alignment 0 ±1.3
F lead to lead distance 5 +0.6 to −0.1 guaranteed between component and tape
∆h component alignment 0 ±2
W tape width 18 +1 to −0.5
W0hold down tape width ≥12.3 −
W1hole position 9 ±0.5
W2hold down tape position ≤3.0 −
H1component height see table
H2component body to seating plane 4 ±1
H3component top to seating plane see table
H0lead-wire clinch height see table ±0.5
D0feed hole diameter 4 ±0.2
t total tape thickness ≤0.9 −with cardboard tape 0.5 ±0.1 mm
L length of snipped lead ≤11 −
TAPE AND REEL ACCORDING TO IEC60286-2 DIMENSIONS in millimeters
SYMBOL PARAMETER DIMENSIONS TOLERANCE REMARKS
REEL SPECIFICATIONS in millimeters
CCB614
22.5
30 +1
−077 85.6 92 356
max.
18
3
W1
W2
REEL DIMENSIONS in millimeters
DIAMETER ∅W1W2
MAX.
<12 42 ±156
12 46 ±160
