• Wide range of trip and non-trip currents:
From 11 mA up to 800 mA
• Small ratio between trip and non-trip currents
= 1.5 at 25 °C)
(I
t/Int
• High maximum inrush current (up to 5.5 A)
• Leaded parts withstand mechanical stresses
and vibration
• UL file E148885 according to XGPU standard UL1434
• UL approved PTCs are guaranteed to withstand severe
test programs
• Long-life cycle tests (over 5000 trip cycles)
• Long-life storage tests (3000 h at 250 °C)
• Electrical cycle tests at low ambient temperatures
(- 40 °C or 0 °C)
• Damp-heat and water immersion tests
• Overvoltage tests at up to 200 % of rated voltage
• Compliant to RoHS directive 2002/95/EC and in
accordance to WEEE 2002/96/EC
Vishay BCcomponents
QUICK REFERENCE DATA
PARAMETERVALUEUNIT
Holding current0.011 to 0.8 A
Resistance at 25 °C (R
I
max.
Switch temperature140°C
Maximum voltage (RMS or DC)265V
Operating temperature range
at max. voltage
)2.1 to 3000Ω
25
0.8 to 5.5A
0 to 70°C
APPLICATIONS
Over-temperature/over-load protection:
• Telecommunications
• Automotive systems
• Industrial electronics
• Consumer electronics
• Electronic data processing
DESCRIPTION
These directly heated thermistors have a positive
temperature coefficient and are primarily intended for
overload protection. They consist of a metallized ceramic
disk with two tinned brass or copper clad steel leads reflow
soldered to it and coated with a high temperature silicone
lacquer. Leadless disks and leaded disks without coating are
available on request.
MOUNTING
The PTC Thermistors are suitable for processing on
automatic insertion equipment.
Typical soldering
235 °C; duration: 5 s (Pb-bearing)
245 °C, duration: 5 s (Lead (Pb)-free)
VOLTAGE DERATING AS A FUNCTION OF AMBIENT TEMPERATURE
ELECTRICAL CHARACTERISTICS I
(%)
V
max.
I
max
(%)
120
100
200
150
80
60
40
20
0
- 25- 500255075200
AS A FUNCTION OF VOLTAGE
max.
100125150175
T
Vishay BCcomponents
(°C)
amb
100
80
I
as stated in the electrical data and ordering information tables, is the maximum overload current that may flow through the
max.
7050400
100120150
V
(%)
rated
PTC when passing from the low ohmic to high ohmic state at rated voltage.
When other voltages are present after tripping, the I
Voltages below V
will allow higher overload currents to pass the PTC.
rated
value can be derived from the above I
max.
as a function of voltage graph.
max.
TYPICAL TRIP-TIME AS A FUNCTION OF TRIP CURRENT RATIO
3
10
t
s
2
10
10
1
-1
10
1246810121416
(1)
(2)
(3)
(4)
(5)
(6)
(7)
It/I
Curve 1: Ø D
Curve 2: Ø D
Curve 3: Ø D
Curve 4: Ø D
Curve 5: Ø D
Curve 6: Ø D
Curve 7: Ø D
Measured in accordance with
“IEC 60738”.
nt
Trip-time or switching time (ts)
To check the trip-time for a specific PTC, refer to the Electrical Data and Ordering Information tables for the value Int. Divide the
overload or trip current by this Int and you realize the factor It/Int. This rule is valid for any ambient temperature between 0 °C
and 70 °C. Adapt the correct non-trip current with the appropriate curve in the Current Deviation as a Function of the Ambient
Temperature graph. The relationship between the It/Int factor and the switching time is a function of the PTC diameter; see the
above graphs.
Example
What will be the trip-time at I
I
from the table: 170 mA at 25 °C
nt
=0.8AandT
ol
= 50 °C of a thermistor type 2381 661 51713; 22 Ω; Ø D
All product specifications and data are subject to change without notice.
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