2322 66. 93034_93113
Vishay BCcomponents
PTC Thermistors, Overload Protection
For Instrumentation
FEATURES AND BENEFITS
•
Fast response time for rapid protection
•
Automatic resetting once overload is removed
•
No contacts to burn out
•
No thermal runaway
•
Operates on DC or AC voltage
•
Small size and rugged construction; see Component
Outline drawing.
DESCRIPTION
Test and measuring instruments, such as oscilloscopes and
digital multimeters, can be easily damaged
if excessive voltages are applied across their input terminals.
Simple and effective overload protection can be provided by
connecting a high-voltage PTC thermistor in series with the
instrument; see Typical connection of the PTC thermistor for
digital multimeter protection drawing. Under normal
conditions, the resistance of the PTC thermistor is low, so the
test voltage will be measured by the instrument. Under an
overload condition, the PTC thermistor will switch to its
high-resistance state, absorbing the overload current and
protecting the instrument. When the overload is removed,
the PTC thermistor will return to its low-resistance state,
ready to resume its protective function.
ELECTRICAL DATA AND ORDERING INFORMATION
NON-TRIP
CURRENT
(RMS VALUE)
at 25
°
C
(mA)
10
10
Note
1. These PTCs can handle maximum voltage without series resistance.
TRIP
CURRENT
(RMS VALUE)
at 25
°
C
(mA)
20
50
NOMINAL
RESISTANCE
at 25
°
C
(
Ω
)
1600
±
300
400
±
100
MAXIMUM
(1)
VOLTAGE
(V)
600
600
INSULATION
VOLTAGE
(V)
−
>
1000
CATALOG
NUMBER
2322 660 93034
2322 661 93113
MECHANICAL DATA
in millimeters
Component outline.
D
T
PHYSICAL DIMENSIONS
in millimeters
H
L
D
T
MAX. MAX.
5
10
4.5
6.5
F
d
MASS
SPQ
(g)
≈
0.47
≈
1.82
500
500
PQ
CATALOG
NUMBER
30
±
3
20
±
3
5.08
8.12
0.6
0.8
10000 2322 660 93034
10000 2322 661 93113
15.5
±
1.5 3.1
±
0.5
H
L
F
∅d
CCB832
For dimensions, see Physical dimensions table.
www.vishay.com
170
For technical questions contact: nlr.europe@vishay.com
Document Number: 29072
Revision: 10-Oct-03
2322 66. 93034_93113
PTC Thermistors, Overload Protection
For Instrumentation
TYPICAL CONNECTION OF THE PTC
THERMISTOR FOR DIGITAL
MULTIMETER PROTECTION.
Vishay BCcomponents
TYPICAL CURRENT/VOLTAGE
CHARACTERISTIC
for 2322 660 93034.
10
2
MLD319
PTC
thermistor
input
Ω
V
A
INSTRUMENT
I RMS
(mA)
10
1
MSB392
1
10
10
2
V RMS (V)
10
3
TYPICAL RESISTANCE/TEMPERATURE
CHARACTERISTIC
for 2322 660 93034.
10
9
R
(Ω)
1.5 V (DC) max.
550 V
pulse
CCB915
TYPICAL RESISTANCE/TEMPERATURE
CHARACTERISTIC
for 2322 661 93113.
10
9
R
(Ω)
1.5 V (DC) max.
375 V
pulse
CCB916
10
8
10
8
10
7
10
7
10
6
10
6
10
5
10
5
10
4
10
4
10
3
10
3
10
2
0
50
100
150
200
T (°C)
250
10
2
0
50
100
150
T (°C)
200
Document Number: 29072
Revision: 10-Oct-03
For technical questions contact: nlr.europe@vishay.com
www.vishay.com
171
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