PTCSSLVT081DBE Vishay, PTCSSLVT081DBE Datasheet - Page 3

• Manufacturer Part Number: PTCSSLVT081DBE
• Description: PTC SS SLV 80C 030 B E4
• Manufacturer: Vishay

Specifications of PTCSSLVT081DBE

• Lead Free Status / RoHS Status: Supplier Unconfirmed

www.vishay.com
3
PTCSSLVT Series/2381 671 914..
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.
APPLICATION EXAMPLES
R1
R2
Fig. 1 Typical comparator circuit
θ
R
PTC
thermistor
R
s
p
As soon as one or more of the windings becomes too hot, the motor is switched off.
R
f
Sleeve Type for Over-Temperature Protection
R
For technical questions, contact:
Fig. 3 Temperature protection of electric motors
L
V
o
θ
θ
PTC Thermistors,
θ
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
comparator's output voltage V
overtemperature occurs, the PTC thermistor will quickly heat
up to its trigger or nominal reference temperature T
whereupon its resistance will increase to a value much
higher than R
to activate an alarm, relay or power shutdown circuit.
[e-mail]
V
o
s
, causing V
Fig. 2 Typical switch characteristic
(R1 = R2)
R
p
R
s
temperature
p
) is lower than R
trigger
O
T
to switch to a high level sufficient
n
O
will be low. If an equipment
(R1 = R2)
R
p
Document Number: 29116
R
s
s
(see Fig. 2), so the
Revision: 03-Sep-10
T (°C)
n
,