PTCSGM3T071DBE Vishay, PTCSGM3T071DBE Datasheet - Page 3

• Manufacturer Part Number: PTCSGM3T071DBE
• Description: PTC SS LUG 3M38 70C0 030 60C B E3
• Manufacturer: Vishay
• Type: PTCr

Specifications of PTCSGM3T071DBE

• Pin Count: 2
• Resistance @ 25c: 100Ohm
• Thermal Time Constant: 8s
• Percentage Of Resistance Tolerance @ 25c: ±1
• Product Length (mm): Not Requiredmm
• Product Depth (mm): Not Requiredmm
• Lead Free Status / RoHS Status: Compliant

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2381 671 912../PTCSG..T....BE
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 (R
lower than R
thermistor will quickly heat up to its trigger or nominal reference temperature T
much higher than R
APPLICATION EXAMPLES
R1
R2
s
+ θ
(see Fig. 2), so the comparator's output voltage V
Fig. 1 Typical comparator circuit
s
R
, causing V
PTC
thermistor
R
s
p
O
R
to switch to a high level sufficient to activate an alarm, relay or power shutdown circuit.
f
1 000 000
100 000
for Over-Temperature Protection
For technical questions, contact:
10 000
PTC Thermistors, Lug Sensors
1000
100
10
- 50 - 25
R
L
V
2381 671 91212
PTCSGM3T141DBE
0
O
25
2381 671 91209
PTCSGM3T131DBE
Temperature (°C)
50
O
will be low. If an equipment overtemperature occurs, the PTC
75 100 125 150 175 200
2381 671 91214
PTCSGM3T151DBE
[e-mail]
V
O
n
, whereupon its resistance will increase to a value
(R1 = R2)
Fig. 2 Typical switch characteristic
R
p
< R
s
temperature
Trigger
T
n
(R1 = R2)
R
Document Number: 29018
p
> R
s
Revision: 08-Jun-09
T (°C)
p
) is