2322 661 93148 Vishay, 2322 661 93148 Datasheet - Page 2

• Manufacturer Part Number: 2322 661 93148
• Description: THERMISTOR 25 OHM 250V PTC
• Manufacturer: Vishay
• Series: 661r

Specifications of 2322 661 93148

• Voltage - Max: 250V
• Time To Trip: 1.3s
• Current - Hold (ih) (max): 70mA
• Current - Trip (it): 175mA
• Package / Case: Radial
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Current - Max: -
• R Min/max: -
• Other names: 232266193148; BC1557TR; PTCTL3MR250HTC

PTC THERMISTORS IN BULK
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
• 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
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
www.vishay.com
164
2322 66. 9....
Vishay BCcomponents
COMPONENT DIMENSIONS AND PACKAGING in millimeters
power lines or railway systems, usually caused when these
lines or systems develop faults.
MAX.
(MM)
13.6
8.5
7.0
7.0
8.3
6.7
7.0
8.3
7.0
8.5
11
11
D
thermistors
MAX.
(MM)
5.0
4.0
5.0
4.0
4.5
4.5
1.8
4.0
6.0
5.0
4.0
4.0
T
(see Electrical
1.5 to 3.0
1.5 to 3.0
2.0 ± 0.5
4.0 ± 1.0
4.0 ± 1.0
2.0 ± 0.5
4.0 ± 1.0
1.5 ± 0.5
2.5 ± 0.5
2.5 ± 0.5
1.5 to 3
(MM)
H
−
2
4.1 ± 0.5
20 ± 4.0
20 ± 3.0
(MM)
Data
L
For technical questions contact: [e-mail]
−
−
−
−
−
−
−
−
−
1
PTC Thermistors, Overload Protection
H
3
H
L
and
2
1
MAX.
(MM)
11.5
10.0
11.0
15.5
15.5
18.6
10.3
10.0
11.5
9.8
9.8
H
−
For Telecommunication
Ordering
D
3
d
(MM)
F
H
16
18
16
18
16
16
18
16
−
−
−
−
0
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
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
places even greater demands on the manufacture of PTC
thermistors. For these applications PTC thermistors which
have a R
300 to 600 V
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
as 0.5 Ω .
T
Taped on Reel
Taped on Reel
Taped on Reel
Taped on Reel
Taped on Reel
Taped on Reel
Taped on Reel
Taped on Reel
CCB914
disc on tray
TYPE
Bulk
Bulk
Bulk
25
RMS
PACKAGING
value of 10 Ω with voltages in the
RMS
D
range are available.
can be present for several seconds
S.P.Q.
3,000
3,000
3,000
3,000
3,000
3,000
5,600
3,000
3,000
200
250
500
(1)(2)
25
values matched to as close
T
6,000
6,000
6,000
6,000
6,000
6,000
5,600
6,000
6,000
6,000
6,000
6,000
P.Q.
Document Number: 29070
Revision: 15-Oct-04
25
values, which
CATALOG
2322 ... .....
661 93048
661 93147
661 93037
661 93175
662 93081
662 93074
661 93118
661 93148
663 93025
661 93078
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661 93124
NUMBER