2322 671 912..
Vishay BCcomponents
PTC Thermistors, For Temperature Protection
FEATURES
•
•
•
•
•
•
•
•
Well-defined protection temperature levels
Very fast reaction time
Accurate resistance for ease of circuit design
Excellent long term behavior
Wide range of protection temperatures
No need to reset supply after overtemperature switch
Small size and rugged
Coated leaded and naked devices available.
QUICK REFERENCE DATA
PARAMETER
Maximum resistance at 25
°
C
Minimum resistance at
(T
n
+ 20)
°
C
Maximum (DC) voltage
Temperature range
Weight:
91202 to 91214
Climatic category
≈
2.0
25/125/56
g
VALUE
120
4000
30
−
20 to (T
n
+ 15)
UNIT
Ω
Ω
V
°
C
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
570
550
550
550
550
550
550
550
R
MIN
at T
n
+
5
°
C
(k
Ω
)
570
570
1330
1330
1330
1330
1330
1330
1330
R
MIN
at T
n
+
15
°
C
(
Ω
)
-
-
4000
4000
4000
4000
4000
4000
4000
R
MIN
at T
n
+
20
°
C
(k
Ω
)
4000
4000
-
-
-
-
-
-
-
CATALOG NUMBER
2322 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
+ 15)
°
C
Minimum resistance at (T
n
+ 5)
°
C
Maximum voltage
VALUES
120
Ω
see Nominal Working Temperatures and Ordering Information table
see Nominal Working Temperatures and Ordering Information table
see Nominal Working Temperatures and Ordering Information table
30 V (AC or DC)
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Document Number: 29018
Revision: 18-Oct-04
2322 671 912..
PTC Thermistors, For Temperature Protection
Vishay BCcomponents
PACKAGING QUANTITIES AND CATALOG NUMBERS
PACKAGING
SPQ
200
PQ
4000
CATALOG NUMBERS
2322 ... .....
671 91202 to 671 91214
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 91102 to 91114.
TYPICAL RESISTANCE/TEMPERATURE
CHARACTERISTIC FOR
2322 671 91202
1,0E+06
TYPICAL RESISTANCE/TEMPERATURE
CHARACTERISTIC FOR
2322 671 91203
1,0E+06
R (Ω)
R (Ω)
1,0E+05
1,0E+05
1,0E+04
1,0E+04
1,0E+03
1,0E+03
1,0E+02
1,0E+02
1,0E+01
0
25
50
75
100
125
1,0E+01
0
25
50
75
100
125
T (°C)
T (°C)
Document Number: 29018
Revision: 18-Oct-04
For technical questions contact: nlr.europe@vishay.com
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173
2322 671 912..
PTC Thermistors, For Temperature Protection
Vishay BCcomponents
TYPICAL RESISTANCE/TEMPERATURE
CHARACTERISTIC FOR
2322 671 91204
1,0E+06
TYPICAL RESISTANCE/TEMPERATURE
CHARACTERISTIC FOR
2322 671 91205
1,0E+06
R (Ω)
1,0E+05
R (Ω)
1,0E+05
1,0E+04
1,0E+04
1,0E+03
1,0E+03
1,0E+02
1,0E+02
1,0E+01
0
25
50
75
100
125
1,0E+01
0
25
50
75
100
125
150
T (°C)
T (°C)
TYPICAL RESISTANCE/TEMPERATURE
CHARACTERISTIC FOR
2322 671 91206
1,0E+06
TYPICAL RESISTANCE/TEMPERATURE
CHARACTERISTIC FOR
2322 671 91207
1,0E+06
R (Ω)
R (Ω)
1,0E+05
1,0E+05
1,0E+04
1,0E+04
1,0E+03
1,0E+03
1,0E+02
1,0E+02
1,0E+01
0
25
50
75
100
125
150
1,0E+01
0
25
50
75
100
125
150
175
T (°C)
T (°C)
Document Number: 29018
Revision: 18-Oct-04
For technical questions contact: nlr.europe@vishay.com
www.vishay.com
174
2322 671 912..
Vishay BCcomponents
PTC Thermistors, For Temperature Protection
TYPICAL RESISTANCE/TEMPERATURE
CHARACTERISTIC FOR
2322 671 91209
TYPICAL RESISTANCE/TEMPERATURE
CHARACTERISTIC FOR
2322 671 91212
1,0E+06
1.0E+06
R (Ω)
R (Ω)
1.0E+05
1,0E+05
1,0E+04
1.0E+04
1,0E+03
1.0E+03
1,0E+02
1.0E+02
1,0E+01
0
25
50
75
100
125
150
175
1.0E+01
0
25
50
75
100
125
150
175
T (°C)
T (°C)
TYPICAL RESISTANCE/TEMPERATURE
CHARACTERISTIC FOR
2322 671 912014
1,0E+06
R (Ω)
1,0E+05
1,0E+04
1,0E+03
1,0E+02
1,0E+01
0
25
50
75
100
125
150
175
200
T (°C)
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For technical questions contact: nlr.europe@vishay.com
Document Number: 29018
Revision: 18-Oct-04
2322 671 912..
Vishay BCcomponents
PTC Thermistors, For 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 (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
Vo
Rp
Rs
(R1 = R2)
R1
Rs
RL
VO
Rf
Rp
Rs
(R1 = R2)
R2
θ
PTC
thermistor
Rp
trigger
temperature
Tn
T (
o
C)
Fig.1 Typical comparator circuit.
Fig.2 Typical switch characteristic.
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
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For technical questions contact: nlr.europe@vishay.com
Document Number: 29018
Revision: 18-Oct-04
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