2381 671 912../PTCSG..T....BE
Vishay BCcomponents
PTC Thermistors,
For Temperature Protection
FEATURES
•
•
•
•
•
•
•
•
•
Well-defined protection temperature levels
Fast reaction time (< 30 s in still air)
Accurate resistance for ease of circuit design
Excellent long term behavior (< 1 °C or 5 % after 1000 h at
T
n
+ 15 °C)
Wide range of protection temperatures (70 °C to 150 °C)
No need to reset supply after overtemperature switch
Small size and rugged
Coated leaded and naked devices available
Component in accordance to RoHS 2002/95/EC and
WEEE 2002/96/EC
QUICK REFERENCE DATA
PARAMETER
Maximum resistance at 25 °C
Minimum resistance at
(T
n
+ 15) °C
Maximum (DC) voltage
Thermal time constant
Temperature range
Weight:
Climatic category
VALUE
100
4000
30
± 8.0
- 40 to (T
n
+ 15)
± 2.0
40/125/56
UNIT
Ω
Ω
V
s
°C
g
APPLICATIONS
•
•
•
•
Industrial electronics
Power supplies
Electronic data processing
Motor protection
DESCRIPTION
These directly heated thermistors have a positive
temperature coefficient and are primarily intended for
sensing.
NOMINAL WORKING TEMPERATURES AND ORDERING INFORMATION
NOMINAL WORKING TEMPERATURE
T
n
(°C)
70
80
90
100
110
120
130
140
150
R
max.
at T
n
- 5 °C
(Ω)
570
550
550
550
550
550
550
550
550
R
min.
at T
n
+ 5 °C
(Ω)
570
1330
1330
1330
1330
1330
1330
1330
1330
CATALOG NUMBER 2381 671
.....
LUG DEVICE
91202
91203
91204
91205
91206
91207
91209
91212
91214
ELECTRICAL CHARACTERISTICS
PARAMETER
Maximum resistance at 25 °C
Maximum resistance at (T
n
- 5) °C
Minimum resistance at (T
n
+ 5) °C
Minimum resistance at (T
n
+ 15) °C
Maximum voltage
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64
VALUES
100
Ω
see Nominal Working Temperatures and Ordering Information table
see Nominal Working Temperatures and Ordering Information table
4000
Ω
30 V (AC or DC)
For technical questions, contact: nlr.europe@vishay.com
Document Number: 29018
Revision: 19-Dec-07
2381 671 912../PTCSG..T....BE
PTC Thermistors,
For Temperature Protection
CATALOG NUMBERS AND PACKAGING
12 NC
2381 671 91202
2381 671 91203
2381 671 91204
2381 671 91205
2381 671 91206
2381 671 91207
2381 671 91209
2381 671 91212
2381 671 91214
SAP
PTCSGM3T071DBE
PTCSGM3T081DBE
PTCSGM3T091DBE
PTCSGM3T101DBE
PTCSGM3T111DBE
PTCSGM3T121DBE
PTCSGM3T131DBE
PTCSGM3T141DBE
PTCSGM3T151DBE
SPQ
200
200
200
200
200
200
200
200
200
Vishay BCcomponents
COMPONENT OUTLINES
dimensions in millimeters
0.145 [3.68] dia hole
0.281
[7.14]
0.157
±
0.039
[4
±
1]
1.496
±
0.157
[38
±
4]
0.64 [16.26] max.
0.04
[1.016]
Component outline for 2381 671 91202 to 91214
TYPICAL RESISTANCE/TEMPERATURE CHARACTERISTIC
10 000 000
10 000 000
1 000 000
2381 671 91202
PTCSGM3T071DBE
100 000
1 000 000
2381 671 91205
PTCSGM3T101DBE
100 000
Resistance (Ω)
10 000
2381 671 91203
PTCSGM3T081DBE
Resistance (Ω)
10 000
2381 671 91206
PTCSGM3T111DBE
1000
1000
100
2381 671 91204
PTCSGM3T091DBE
10
- 50
- 25
0
25
50
75
100
125
150
100
2381 671 91207
PTCSGM3T121DBE
10
- 50 - 25
0
25
50
75
100 125 150 175
Temperature (°C)
Temperature (°C)
Document Number: 29018
Revision: 19-Dec-07
For technical questions, contact: nlr.europe@vishay.com
www.vishay.com
65
2381 671 912../PTCSG..T....BE
Vishay BCcomponents
PTC Thermistors,
For Temperature Protection
1 000 000
100 000
2381 671 91209
PTCSGM3T131DBE
Resistance (Ω)
10 000
2381 671 91212
PTCSGM3T141DBE
1000
100
2381 671 91214
PTCSGM3T151DBE
10
- 50 - 25
0
25
50
75 100 125 150 175 200
Temperature (°C)
APPLICATION SPECIFIC DATA
Negative Temperature Coefficient (NTC) thermistors are well
known for temperature sensing. What is not well known,
however, is that Positive Temperature Coefficient (PTC)
thermistors can be used for thermal protection. Although
their operating principles are similar, the applications are
very different; whereas NTC thermistors sense and measure
temperature over a defined range, PTC thermistors switch at
one particular temperature.
Just like thermostats they protect such equipment and
components as motors, transformers, power transistors and
thyristors against overtemperature. A PTC thermistor is less
expensive than a thermostat, and its switch temperature can
be more accurately specified. It is also smaller and easier to
design-in to electronic circuitry.
So how does it work? The PTC thermistor is mounted in
thermal contact with the equipment to be protected, and
connected into the bridge arm of a comparator circuit, such
as shown in Fig. 1. At normal temperature, the PTC
thermistor resistance (R
p
) is lower than R
s
(see Fig. 2), so the
comparator's output voltage V
O
will be low. If an equipment
overtemperature occurs, the PTC thermistor will quickly heat
up to its trigger or nominal reference temperature T
n
,
whereupon its resistance will increase to a value much
higher than R
s
, causing V
O
to switch to a high level sufficient
to activate an alarm, relay or power shutdown circuit.
APPLICATION EXAMPLES
V
o
R
p
R
s
(R1 = R2)
R1
R
s
R
L
V
o
R
f
R
p
R
s
(R1 = R2)
R2
θ
PTC
thermistor
R
p
trigger
temperature
T
n
T (°C)
Fig. 1 Typical comparator circuit
Fig. 2 Typical switch characteristic
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66
For technical questions, contact: nlr.europe@vishay.com
Document Number: 29018
Revision: 19-Dec-07
2381 671 912../PTCSG..T....BE
PTC Thermistors,
For Temperature Protection
Vishay BCcomponents
A
θ
θ
θ
θ
θ
θ
θ
As soon as one or more of the windings becomes too hot, the
motor is switched off.
The PTC thermistors located above the fluid level will be heated to
a temperature greater than T
n
.
When immersed they are cooled such that their resistance value is
reduced.
Fig. 4 Liquid-level indication
Fig. 3 Temperature protection of electric motors
Document Number: 29018
Revision: 19-Dec-07
For technical questions, contact: nlr.europe@vishay.com
www.vishay.com
67
Legal Disclaimer Notice
Vishay
Disclaimer
All product specifications and data are subject to change without notice.
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 herein
or in any other disclosure relating to any product.
Vishay disclaims any and all liability arising out of the use or application of any product described herein or of any
information provided herein to the maximum extent permitted by law. The product specifications do not expand or
otherwise modify Vishay’s terms and conditions of purchase, including but not limited to the warranty expressed
therein, which apply to these products.
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.
The products shown herein are not designed for use in medical, life-saving, or life-sustaining applications unless
otherwise expressly indicated. Customers using or selling Vishay products not expressly indicated for use in such
applications do so entirely at their own risk and agree to fully indemnify Vishay for any damages arising or resulting
from such use or sale. Please contact authorized Vishay personnel to obtain written terms and conditions regarding
products designed for such applications.
Product names and markings noted herein may be trademarks of their respective owners.
Document Number: 91000
Revision: 18-Jul-08
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