www.vishay.com For technical questions, contact: nlr@vishay.com Document Number: 29012
60 Revision: 08-Jun-09
2381 671 911../PTCSL..T....BE
Vishay BCcomponents
PTC Thermistors, Mini Radial Leaded
for Over-Temperature Protection
FEATURES
Well-defined protection temperature levels
Fast reaction time (< 15 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 voltage 30 V
Temperature range - 20 to (Tn+ 15) °C
Weight:
91102 to 91114 0.08 g
91152 to 91164 0.11 g
Climatic category 25/125/56
NOMINAL WORKING TEMPERATURES AND ORDERING INFORMATION
NOMINAL WORKING TEMPERATURE CATALOG NUMBER 2381 671 .....
Tn
(°C)
RESISTANCE from
- 20 °C to Tn- 20 °C
(Ω)
RESISTANCE
at Tn- 5 °C
(Ω)
RESISTANCE
at Tn+ 5 °C
(kΩ)
LEADED DEVICE
COLOR CODE
NORMAL
LEADS LONG LEADS
70 30 to 250 50 to 570 0.570 to 50 91102 91152 Black
80 30 to 250 50 to 550 1.33 to 50 91103 91153 Brown
90 30 to 250 50 to 550 1.33 to 50 91104 91154 Red
100 30 to 250 50 to 550 1.33 to 50 91105 91155 Orange
110 30 to 250 50 to 550 1.33 to 50 91106 91156 Yellow
120 30 to 250 50 to 550 1.33 to 50 91107 91157 Green
130 30 to 250 50 to 550 1.33 to 50 91109 91159 Blue
140 30 to 250 50 to 550 1.33 to 50 91112 91162 Violet
150 30 to 250 50 to 550 1.33 to 50 91114 91164 Grey
Document Number: 29012 For technical questions, contact: nlr@vishay.com www.vishay.com
Revision: 08-Jun-09 61
2381 671 911../PTCSL..T....BE
PTC Thermistors, Mini Radial Leaded
for Over-Temperature Protection Vishay BCcomponents
COMPONENT OUTLINES DIMENSIONS in millimeters
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+ 15) °C 4000 Ω
Minimum resistance at (Tn+5)°C See Nominal Working Temperatures and Ordering Information table
Maximum voltage 30 V (AC or DC)
CATALOG NUMBERS AND PACKAGING
12NC SAP 12NC SAP SPQ
2381 671 91102 PTCSL20T071DBE 2381 671 91152 PTCSL40T071DBE 500
2381 671 91103 PTCSL20T081DBE 2381 671 91153 PTCSL40T081DBE 500
2381 671 91104 PTCSL20T091DBE 2381 671 91154 PTCSL40T091DBE 500
2381 671 91105 PTCSL20T101DBE 2381 671 91155 PTCSL40T101DBE 500
2381 671 91106 PTCSL20T111DBE 2381 671 91156 PTCSL40T111DBE 500
2381 671 91107 PTCSL20T121DBE 2381 671 91157 PTCSL40T121DBE 500
2381 671 91109 PTCSL20T131DBE 2381 671 91159 PTCSL40T131DBE 500
2381 671 91112 PTCSL20T141DBE 2381 671 91162 PTCSL40T141DBE 500
2381 671 91114 PTCSL20T151DBE 2381 671 91164 PTCSL40T151DBE 500
Ø 0.4
3.0 max.
2.54
20.0 ± 2
3.5 max.
7.0 max.
0.5 min.
Component outline for 91102 to 91114
Ø 0.4
3.0 max.
2.54
40.0 min.
3.5 max.
7.0 ma x.
0.5 mi n.
Component outline for 91152 to 91164
www.vishay.com For technical questions, contact: nlr@vishay.com Document Number: 29012
62 Revision: 08-Jun-09
2381 671 911../PTCSL..T....BE
Vishay BCcomponents PTC Thermistors, Mini Radial Leaded
for Over-Temperature Protection
TYPICAL RESISTANCE/TEMPERATURE
CHARACTERISTIC FOR 2381 671 91105/91106
and 91107
TYPICAL RESISTANCE/TEMPERATURE
CHARACTERISTIC FOR 2381 671 91102/91103
and 91104
TYPICAL RESISTANCE/TEMPERATURE
CHARACTERISTIC FOR 2381 671 91109
TYPICAL RESISTANCE/TEMPERATURE
CHARACTERISTIC FOR 2381 671 91112 and 91114
10
102
103
104
0 50 100 150 200 250
10
6
105
Tn = 120 °C
1.5 V (DC) max.
Tn = 110 °C
Tn = 100 °C
Resistance (Ω)
Temperature (°C)
10
102
103
104
0 50 100 150 200 250
106
105
T
n
= 90 °C
1.5 V (DC) max.
T
n
= 70 °C
T
n
= 80 °C
Resistance (Ω)
Temperature (°C)
10
102
103
104
0 50 100 150 200 250
106
105
1.5 V (DC) max.
Tn = 130 °C
Resistance (Ω)
Temperature (°C)
10
102
103
104
0 50 100 150 200 250
106
105
Tn = 140 °C
1.5 V (DC) max.
Tn = 150 °C
Resistance (Ω)
Temperature (°C)
Document Number: 29012 For technical questions, contact: nlr@vishay.com www.vishay.com
Revision: 08-Jun-09 63
2381 671 911../PTCSL..T....BE
PTC Thermistors, Mini Radial Leaded
for Over-Temperature Protection Vishay BCcomponents
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
As soon as one or more of the windings becomes too hot, the
motor is switched off.
+ θ
+ θ
+ θ
Trigger
temperature
Tn
VO
T (°C)
Rp > Rs
(R1 = R2)
Rp < Rs
(R1 = R2)
PTC
thermistor
R
p
R
L
R
f
R
s
R1
R2 + θ
V
O
Fig. 2 Typical switch characteristic
Fig. 1 Typical comparator circuit
Fig. 3 Temperature protection of electric motors
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Revision: 02-Oct-12 1Document Number: 91000
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