PTC Thermistors, For Temperature Protection
2322 671 91...
Vishay BCcomponents
www.vishay.com
For technical questions contact: nlr.europe@vishay.com
Document Number: 29074
172
Revision: 10-Oct-03
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.
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.
QUICK REFERENCE DATA
PARAMETER
VALUE
UNIT
Maximum resistance at 25
C
120
Minimum resistance at
(T
n
+ 15)
C
4000
Maximum (DC) voltage
30
V
Temperature range
-
20 to (T
n
+ 15)
C
Weight:
91002 to 91014
0.013
g
91072 to 91087
0.003
g
91102 to 91114
0.08
g
91152 to 91164
0.09
g
Climatic category
25/125/56
NOMINAL WORKING TEMPERATURES AND ORDERING INFORMATION
Notes
1. Naked chips are packed in a hermetically-sealed alu-plastic bag.
2. Resistance at T
n
+5
C = 0.570 to 50 k
.
NOMINAL WORKING TEMPERATURE
TYPE/CATALOG NUMBER 2322 ... .....
T
n
(
C)
RESISTANCE
from
-
-
-
-
20
C
to T
n
-
-
-
-
20
C
(
)
RESISTANCE
at T
n
-
-
-
-
5
C
(
)
RESISTANCE
at T
n
+
+
+
+
5
C
(k
)
NAKED CHIP
(1)
LEADED DEVICE
1.0
1.0
(mm)
1.7
1.7
(mm)
NORMAL
LEADS
LONG
LEADS
COLOR
CODE
671 .....
671 .....
671 .....
671 .....
70
30 to 250
50 to 570
0.570 to 50
91072
91002
91102
91152
black
80
30 to 250
50 to 550
1.33 to 50
91073
(2)
91003
91103
91153
brown
90
30 to 250
50 to 550
1.33 to 50
91074
(2)
91004
91104
91154
red
100
30 to 250
50 to 550
1.33 to 50
91075
(2)
91005
91105
91155
orange
110
30 to 250
50 to 550
1.33 to 50
91076
91006
91106
91156
yellow
120
30 to 250
50 to 550
1.33 to 50
91077
91007
91107
91157
green
125
30 to 250
50 to 550
1.33 to 50
91078
-
-
-
-
130
30 to 250
50 to 550
1.33 to 50
91079
91009
91109
91159
blue
135
30 to 250
50 to 550
1.33 to 50
91081
-
-
-
-
140
30 to 250
50 to 550
1.33 to 50
91082
91012
91112
91162
violet
145
30 to 250
50 to 550
1.33 to 50
91083
-
-
-
-
150
30 to 250
50 to 550
1.33 to 50
91084
91014
91114
91164
grey
155
30 to 250
50 to 550
1.33 to 50
91085
-
-
-
-
160
30 to 250
50 to 550
1.33 to 50
91086
91016
-
-
-
170
30 to 250
50 to 550
1.33 to 50
91087
91017
-
-
-
2322 671 91...
PTC Thermistors, For Temperature Protection
Vishay BCcomponents
Document Number: 29074
For technical questions contact: nlr.europe@vishay.com
www.vishay.com
Revision: 10-Oct-03
173
For clamping, reflow or hand soldering. Not intended for either wave or ultrasonic soldering and not for spot welding.
All standard solder alloys with low activated halogene-free fluxes are acceptable, for example: 62Sn/36Pb/2Ag.
1.7 0.15
0.8 0.1
1.7 0.15
MGA051
91002 to 91017
1.0 0.1
0.5 0.1
1.0 0.1
JW127
91071 to 91087
Component outline for 91071 to 91087.
Component outline for 91002 to 91017.
ELECTRICAL CHARACTERISTICS
PARAMETER
VALUES
Maximum resistance at 25
C
120
Maximum resistance at (T
n
-
5)
C
see Nominal Working Temperatures and Ordering Information table
Minimum resistance at (T
n
+ 15)
C
4000
Minimum resistance at (T
n
+ 5)
C
see Nominal Working Temperatures and Ordering Information table
Maximum voltage
30 V (AC or DC)
Component outline for 91102 to 91114.
MGC102
O 0.4
3.0 max
2.54
20.0
2
3.5 max
7.0 max
0.5 min
Component outline for 91152 to 91164.
JW128
O 0.4
3.0 max
2.54
40.0
3.5 max
7.0 max
0.5 min
min
DIMENSIONS
in millimeters
PACKAGING QUANTITIES AND CATALOG NUMBERS
PACKAGING
CATALOG NUMBERS
2322 ... .....
SPQ
PQ
5000
20000
671 91002 to 671 91014
5000
20000
671 91072 to 671 91087
500
5000
671 91102 to 671 91114
500
5000
671 91152 to 671 91164
COMPONENT OUTLINES
2322 671 91...
Vishay BCcomponents
PTC Thermistors, For Temperature Protection
www.vishay.com
For technical questions contact: nlr.europe@vishay.com
Document Number: 29074
174
Revision: 10-Oct-03
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
As soon as one or more of the windings becomes too hot, the
motor is switched off.
MBD129
Fig.3 Temperature protection of electric motors
MBD126
A
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.
MBA921 - 2
trigger
temperature
Tn
R p
R s
R p
R s
Vo
(R1 = R2)
(R1 = R2)
T ( C)
o
Fig.2 Typical switch characteristic.
MBA920
PTC
thermistor
R p
R
f
L
R
R s
R1
R2
VO
Fig.1 .Typical comparator circuit.
2322 671 91...
PTC Thermistors, For Temperature Protection
Vishay BCcomponents
Document Number: 29074
For technical questions contact: nlr.europe@vishay.com
www.vishay.com
Revision: 10-Oct-03
175
CCB897
10
10
2
10
3
10
4
0
50
100
150
200
250
R
()
T (C)
10
6
10
5
T
n
= 90 C
T
n
= 80 C
T
n
= 70 C
1.5 V (DC) max.
TYPICAL RESISTANCE/TEMPERATURE
CHARACTERISTIC FOR 2322 671 91052/002/102,
91053/003/103 and 91054/004/104.
TYPICAL RESISTANCE/TEMPERATURE
CHARACTERISTIC FOR 2322 671 91055/005/105,
91056/006/106 and 91057/007/107.
CCB898
10
10
2
10
3
10
4
0
50
100
150
200
250
R
()
T (C)
10
6
10
5
T
n
= 100 C
T
n
= 110 C
T
n
= 120 C
1.5 V (DC) max.
CCB899
10
10
2
10
3
10
4
0
50
100
150
200
250
R
()
T (C)
10
6
10
5
T
n
= 135 C
T
n
= 130 C
T
n
= 125 C
1.5 V (DC) max.
CCB900
10
10
2
10
3
10
4
0
50
100
150
200
250
R
()
T (C)
10
6
10
5
T
n
= 145 C
T
n
= 140 C
T
n
= 150 C
1.5 V (DC) max.
TYPICAL RESISTANCE/TEMPERATURE
CHARACTERISTIC FOR
2322 671 91058,
91059/009/109 and 91061.
TYPICAL RESISTANCE/TEMPERATURE
CHARACTERISTIC FOR
2322 671 91062/012/112,
91063 and 91064/014/114.
2322 671 91...
Vishay BCcomponents
PTC Thermistors, For Temperature Protection
www.vishay.com
For technical questions contact: nlr.europe@vishay.com
Document Number: 29074
176
Revision: 10-Oct-03
CCB901
10
10
2
10
3
10
4
0
50
100
150
200
250
R
()
T (C)
10
6
10
5
T
n
= 160 C
T
n
= 155 C
T
n
= 170 C
1.5 V (DC) max.
TYPICAL RESISTANCE/TEMPERATURE
CHARACTERISTIC FOR
2322 671 91065,
91066 and 91067.
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