PTCTL
www.vishay.com
Vishay BCcomponents
PTC Thermistors, Overload Protection for Telecommunication
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
• Material categorization: for definitions of compliance
please see
www.vishay.com/doc?99912
QUICK REFERENCE DATA
PARAMETER
Maximum voltage (RMS or DC)
Maximum holding current (I
nt
)
Resistance at 25 °C (R
25
)
Tolerance on
R
25
value
Maximum overload current I
ol
Tripping time at 1 A
Operating temperature range
at max. voltage
VALUE
220 to 600
100 to 175
8 to 50
15 to 25
0.6 to 10.0
1 to 40
0 to 70 (95)
UNIT
V
RMS
mA
Ω
%
A
s
°C
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 gray coated body
BC and
R
25
value
ELECTRICAL DATA AND ORDERING INFORMATION
RESISTANCE
R
25
(Ω)
25
10
25
16
10
25
10
8
16
10
10
50
35
25
25
10
10
TOL.
(%)
± 20
± 20
± 15
± 20
± 20
± 20
± 20
± 25
± 25
± 20
± 20
± 20
± 20
± 20
± 20
± 20
± 20
MATCHING
(Ω)
1.0
1.0
no
no
no
1.0
no
0.5
no
no
1.0
1.0
3.0
0.5
0.5
0.5
no
V
max.
(V
RMS
)
220
230
245
245
245
250
250
285
300
350
350
600
600
600
600
600
600
NON-TRIP
CURRENT
I
nt
(mA)
70
100
70
140
140
70
100
135
100
100
100
50
70
70
70
175
175
at T
(°C)
70
70
70
55
55
70
70
95
70
70
70
70
70
70
70
25
25
TRIP
CURRENT
I
t
(mA)
200
250
200
270
270
175
450
400
250
270
270
140
600
170
170
400
400
at T
(°C)
25
25
25
25
25
25
0
25
25
25
25
25
0
25
25
25
25
MAX.
TRIP TIME
at 1 A
t
max.
(S)
2.5
3.0
5.0
8.0
8.0
1.3
40.0
6.0
2.0
4.0
4.0
1.0
3.0
2.5
5.0
7.0
7.0
I
max.
AT
V
max.
I
max.
(A)
4.0
2.0
2.6
1.6
2.0
3.2
10.0
0.6
2.6
1.0
1.0
1.0
1.0
2.0
2.0
1.0
1.0
APPLICATION
AREA
(2)
C.O.
MDF; ISDN
C.O.
T.E.
T.E.
MDF; C.O.
T.E.
MDF; ISDN
MDF; T.E.
T.E.; S.B.
C.O.
C.O.
C.O.
C.O.
C.O.
C.O.
T.E.; S.B.
ORDERING PART
NUMBERS
PTCTL4MR250GTE
PTCTL3MR100GTE
PTCTL4NR250GTE
PTCTL6NR160GTE
PTCTL6NR100GTE
PTCTL3MR250HTE
PTCTL8NR100HBE
PTCTL4MR080JBE
PTCTL3NR160KTE
PTCTL4NR100LBE
PTCTL4MR100LTE
PTCTL4MR500SBE
PTCTL4MR350STE
PTCTL4MR250STE
PTCTL6MR250STE
PTCTL7MR100SBE
(1)
PTCTL7NR100SBE
(1)
Notes
• All types pass ITU-T K20-21-45 telecommunication protection recommendation
(1)
UL 1434 approved types and compatible with UL1459 and GR1089
(2)
MDF: Main Distribution Frame; C.O.: Central Office Switching; T.E.: Subscriber Terminal Equipment; S.B.: Set-top Box
Revision: 13-Nov-15
Document Number: 29070
1
For technical questions, contact:
nlr@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
PTCTL
www.vishay.com
OVERCURRENT PROTECTION OF TELECOMMUNICATION LINES
The PTC thermistor must protect the telephone line circuit
against overcurrent which may be caused by the following
events:
• 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
fig. 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 amperes with
voltages as high as 650 V
RMS
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
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 V
RMS
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.
Vishay BCcomponents
PRIMARY
PROTECTION
(OPTIONAL)
+
PTC
subscriber
lines
+
SECONDARY
PROTECTION
+
PTC
voltage
clamp
+
PTC
SUBSCRIBER
LOOP
INTERFACE
CIRCUIT
(SLIC)
OR
TRANSFORMER
MDF
Fig. 1 - Typical telephone line showing where PTC thermistors can be used for overcurrent protection.
Revision: 13-Nov-15
Document Number: 29070
2
For technical questions, contact:
nlr@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
PTCTL
www.vishay.com
PTC THERMISTORS IN BULK
D
T
Vishay BCcomponents
H
3
H
2
F
L
1
d
COMPONENT DIMENSIONS
(in mm)
D
MAX.
8.5
7.0
8.3
11
11
7.0
13.6
8.3
7.0
8.5
8.5
8.5
8.0
8.5
10.5
13
13
T
MAX.
5.0
4.0
4.0
4.5
4.5
4.0
6.0
5.0
4.0
4.0
4.0
4.0
5.0
4.0
5.0
5.5
5.5
H
2
1.5 to 3.0
2.0 ± 0.5
1.5 to 3.0
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
2.5 ± 0.5
2.5 ± 0.5
2.5 ± 0.5
2.0 ± 0.5
2.0 ± 0.5
4.0 ± 1.0
4.0 ± 1.0
L
1
-
-
-
-
-
-
20 ± 4.0
20 ± 3.0
-
4.1 ± 0.5
-
4.1 ± 0.5
-
-
-
20 min.
20 min.
H
3
MAX.
11.5
9.8
11.0
15.5
15.5
9.8
18.6
10.3
10.0
11.5
11.5
11.5
11.0
11.0
12.6
18.0
18.0
H
0
16
18
18
16
16
18
-
-
16
-
16
-
16
16
16
-
-
PACKAGING
(1)(2)
TYPE
SPQ
Taped on reel
1500
Taped on reel
1500
Taped on reel
1500
Taped on reel
1500
Taped on reel
1500
Taped on reel
1500
Bulk
200
Bulk
250
Taped on reel
1500
Bulk
500
Taped on reel
1500
Bulk
500
Taped on reel
1500
Taped on reel
1500
Taped on reel
1500
Bulk
200
Bulk
200
ORDERING PART
NUMBER
PTCTL4MR250GTE
PTCTL3MR100GTE
PTCTL4NR250GTE
(3)
PTCTL6NR160GTE
PTCTL6NR100GTE
(3)
PTCTL3MR250HTE
PTCTL8NR100HBE
(3)
PTCTL4MR080JBE
PTCTL3NR160KTE
PTCTL4NR100LBE
PTCTL4MR100LTE
PTCTL4MR500SBE
PTCTL4MR350STE
PTCTL4MR250STE
PTCTL6MR250STE
PTCTL7MR100SBE
PTCTL7NR100SBE
Notes
(1)
Taped in accordance with IEC 60 286-2
(2)
Metallized ceramic pellet for clamping or substrate mounting, available on request
(3)
Insulated version is also available
PTC THERMISTORS ON TAPE AND REEL
TAPE AND REEL ACCORDING TO
IEC 60286-2
(in mm)
SYMBOL
D
PARAMETER
Body diameter
Lead diameter
Pitch between
thermistors
Feedhole pitch
Leadcenter to
leadcenter distance
(between component
and tape)
Lead wire clinch
height
Component bottom
to seating plane
Component top to
seating plane
Total thinkness
DIMENSIONS TOLERANCE
see table
0.6
12.7
12.7
5
max.
± 0.05
±1
± 0.3
+ 0.5 /
- 0.2
±
0.5
see table
max.
max.
P
D
P
P
h
T
d
h
P
H
3
d
W
2
L
W
0
W
1
W
H
0
H
1
H
2
P
0
F
H0
P
0
P
1
F
D
0
T
1
see table
see table
see table
see table
H2
t
H3
T
Revision: 13-Nov-15
Document Number: 29070
3
For technical questions, contact:
nlr@vishay.com
THIS DOCUMENT IS SUBJECT TO CHANGE WITHOUT NOTICE. THE PRODUCTS DESCRIBED HEREIN AND THIS DOCUMENT
ARE SUBJECT TO SPECIFIC DISCLAIMERS, SET FORTH AT
www.vishay.com/doc?91000
Legal Disclaimer Notice
www.vishay.com
Vishay
Disclaimer
ALL PRODUCT, PRODUCT SPECIFICATIONS AND DATA ARE SUBJECT TO CHANGE WITHOUT NOTICE TO IMPROVE
RELIABILITY, FUNCTION OR DESIGN OR OTHERWISE.
Vishay Intertechnology, Inc., its affiliates, agents, and employees, and all persons acting on its or their behalf (collectively,
“Vishay”), disclaim any and all liability for any errors, inaccuracies or incompleteness contained in any datasheet or in any other
disclosure relating to any product.
Vishay makes no warranty, representation or guarantee regarding the suitability of the products for any particular purpose or
the continuing production of any product. To the maximum extent permitted by applicable law, Vishay disclaims (i) any and all
liability arising out of the application or use of any product, (ii) any and all liability, including without limitation special,
consequential or incidental damages, and (iii) any and all implied warranties, including warranties of fitness for particular
purpose, non-infringement and merchantability.
Statements regarding the suitability of products for certain types of applications are based on Vishay’s knowledge of
typical requirements that are often placed on Vishay products in generic applications. Such statements are not binding
statements about the suitability of products for a particular application. It is the customer’s responsibility to validate that a
particular product with the properties described in the product specification is suitable for use in a particular application.
Parameters provided in datasheets and / or specifications may vary in different applications and performance may vary over
time. All operating parameters, including typical parameters, must be validated for each customer application by the customer’s
technical experts. Product specifications do not expand or otherwise modify Vishay’s terms and conditions of purchase,
including but not limited to the warranty expressed therein.
Except as expressly indicated in writing, Vishay products are not designed for use in medical, life-saving, or life-sustaining
applications or for any other application in which the failure of the Vishay product could result in personal injury or death.
Customers using or selling Vishay products not expressly indicated for use in such applications do so at their own risk.
Please contact authorized Vishay personnel to obtain written terms and conditions regarding products designed for
such applications.
No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted by this document
or by any conduct of Vishay. Product names and markings noted herein may be trademarks of their respective owners.
© 2017 VISHAY INTERTECHNOLOGY, INC. ALL RIGHTS RESERVED
Revision: 08-Feb-17
1
Document Number: 91000
嵌入式系统
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
