www.vishay.com For technical questions, contact: nlr@vishay.com Document Number: 29018
64 Revision: 30-Jul-10
2381 671 912../PTCSG..T....BE
Vishay BCcomponents
PTC Thermistors, Lug Sensors
for Over-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 Tn + 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
•Compliant to RoHS directive 2002/95/EC and in
accordance to WEEE 2002/96/EC
APPLICATIONS
Over-temperature protection and control in:
•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.
QUICK REFERENCE DATA
PARAMETER VALUE UNIT
Maximum resistance at 25 °C 100 Ω
Minimum resistance at (Tn+ 15) °C 4000 Ω
Maximum (DC) voltage 30 V
Thermal time constant ± 8.0 s
Temperature range - 40 to (Tn+ 15) °C
Weight: ± 2.0 g
Climatic category 40/125/56
NOMINAL WORKING TEMPERATURES AND ORDERING INFORMATION
NOMINAL WORKING TEMPERATURE CATALOG NUMBER 2381 671 .....
Tn
(°C)
Rmax.
at Tn- 5 °C
(Ω)
Rmin.
at Tn+ 5 °C
(Ω)
LUG DEVICE
70 570 570 91202
80 550 1330 91203
90 550 1330 91204
100 550 1330 91205
110 550 1330 91206
120 550 1330 91207
130 550 1330 91209
140 550 1330 91212
150 550 1330 91214
ELECTRICAL CHARACTERISTICS
PARAMETER VALUES
Maximum resistance at 25 °C 100 Ω
Maximum resistance at (Tn- 5) °C See Nominal Working Temperatures and Ordering Information table
Minimum resistance at (Tn+5)°C See Nominal Working Temperatures and Ordering Information table
Minimum resistance at (Tn+ 15) °C 4000 Ω
Maximum voltage 30 V (AC or DC)
Document Number: 29018 For technical questions, contact: nlr@vishay.com www.vishay.com
Revision: 30-Jul-10 65
2381 671 912../PTCSG..T....BE
PTC Thermistors, Lug Sensors
for Over-Temperature Protection Vishay BCcomponents
COMPONENT OUTLINES DIMENSIONS in millimeters
TYPICAL RESISTANCE/TEMPERATURE CHARACTERISTIC
CATALOG NUMBERS AND PACKAGING
12NC SAP SPQ
2381 671 91202 PTCSGM3T071DBE 200
2381 671 91203 PTCSGM3T081DBE 200
2381 671 91204 PTCSGM3T091DBE 200
2381 671 91205 PTCSGM3T101DBE 200
2381 671 91206 PTCSGM3T111DBE 200
2381 671 91207 PTCSGM3T121DBE 200
2381 671 91209 PTCSGM3T131DBE 200
2381 671 91212 PTCSGM3T141DBE 200
2381 671 91214 PTCSGM3T151DBE 200
0.145 [3.68] dia. hole
0.64 [16.26] max.
0.04
[1.016]
0.281
[7.14]
1.496 ± 0.157
[38 ± 4]
0.157 ± 0.039
[4 ± 1]
Component outline for 2381 671 91202 to 91214
10
100
1000
10 000
100 000
1 000 000
10 000 000
- 50 - 25 0 25 50 75 100 125 150
Resistance (Ω)
Te m p e r a t ure (°C)
2381 671 91204
PTCSGM3T091DBE
2381 671 91203
PTCSGM3T081DBE
2381 671 91202
PTCSGM3T071DBE
10
100
1000
10 000
100 000
1 000 000
10 000 000
- 50 - 25 0 25 50 75 100 125 150 175
Resistance (Ω)
Te m p e r a t ure (°C)
2381 671 91207
PTCSGM3T121DBE
2381 671 91206
PTCSGM3T111DBE
2381 671 91205
PTCSGM3T101DBE
www.vishay.com For technical questions, contact: nlr@vishay.com Document Number: 29018
66 Revision: 30-Jul-10
2381 671 912../PTCSG..T....BE
Vishay BCcomponents PTC Thermistors, Lug Sensors
for Over-Temperature Protection
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 (Rp) is
lower than Rs (see Fig. 2), so the comparator's output voltage VO will be low. If an equipment overtemperature occurs, the PTC
thermistor will quickly heat up to its trigger or nominal reference temperature Tn, whereupon its resistance will increase to a value
much higher than Rs, causing VO to switch to a high level sufficient to activate an alarm, relay or power shutdown circuit.
APPLICATION EXAMPLES
Fig. 1 Typical comparator circuit Fig. 2 Typical switch characteristic
10
100
1000
10 000
100 000
1 000 000
- 50 - 25 0 25 50 75 100 125 150 175 200
Resistance (Ω)
Te m p e r a t ure (°C)
2381 671 91214
PTCSGM3T151DBE
2381 671 91212
PTCSGM3T141DBE
2381 671 91209
PTCSGM3T131DBE
PTC
thermistor
Rp
RL
Rf
Rs
R1
R2 +
VO
Trigger
temperature
Tn
VO
T (°C)
Rp > Rs
(R1 = R2)
Rp < Rs
(R1 = R2)
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www.vishay.com Vishay
Revision: 12-Mar-12 1Document Number: 91000
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