Positive Thermal Coefficient (PTC)
Description
Positive Thermal Coefficient devices(PTC),provide over-current
protection for electrical and electronic devices. They function
using conducting strips of metal imbedded inside polymers.
Under normal conditions, the devices resistance is near zero,
but over-current conditions will heat the PTC and expand the
polymer, increasing the impedance. When current returns to
normal, the components cool down, returning to their original
shape and very low levels of resistance.
RL250 Series
Applications
l
Over-current and over-temperature protection of
automotive electronics
l
Hard disk drives
l
PC motherboards
l
Point-of-sale (POS) equipment
l
PCMCIA cards
l
USB port protection - USB 2.0, 3.0 & OTG
l
HDMI 1.4 Source protection
l
Computers & peripherals
l
Industrial control
l
Security systems
Features
l
I(hold): 0.02~2.0A
l
250V Operating voltages
l
Radial leaded devices.
l
Over-current protection
l
Very high voltage surge capabilities.
l
Available in lead-free version.
l
Fast time–to–trip
l
RoHS compliant, Lead- Free and Halogen-Free
Part Number Code
R
L
X
X
X
-
X
X
X
LOGO
Voltage rating(V
DC
)
Hold current
Environmental Specifications
Test
Passive aging
Humidity aging
Thermal shock
Resistance to solvent
Vibration
Conditions
+85℃，1000hrs
+85℃，85%R.H.1000hrs
+125℃ to -55℃，10times
MIL-STD-202，Method 215
MIL-STD-202，Method 201
Resistance change
±8%
typical
±8%
typical
±12%
typical
No change
No change
Specifications are subject to change without notice.
Please refer to http://
www.ruilon.com.cn
for current information.
Revised: 2018-07-10
Page:1
Positive Thermal Coefficient (PTC)
Electrical Characteristic
Model
I
hold
（A）
0.02
0.03
0.04
0.05
0.06
0.08
0.09
0.10
0.11
0.12
0.145
0.18
0.20
0.30
0.40
0.50
0.60
0.80
1.00
1.20
1.50
2.00
I
T
(A)
0.04
0.06
0.08
0.10
0.12
0.16
0.18
0.20
0.22
0.24
0.29
0.50
0.40
0.60
0.80
1.00
1.20
1.60
2.00
2.40
3.00
4.00
V
max
（V）
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
250
Maximum Time to Trip
Current(A)
0.5
0.5
0.5
0.5
0.5
1
1
1
1
1
1
3
3
3
3
3
3
5
5
6
7.5
10
Time(S)
0.5
0.5
2
1.5
2
0.5
0.8
1.0
2.0
2.0
5
3
5
6
8
10
12
18
20
15
14
14
I
max
（A）
3
3
3
3
3
3
3
3
3
3
3
3
5
5
5
5
5
5
7
3
3
5
Pd
Typ
（W）
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.0
1.5
1.5
2.5
2.5
3.0
3.5
4.0
5.0
6.0
6.0
RL250 Series
Resistance(Ω)
Ri
min
80
40
27
20
20
12
10
10
6
5
3
0.8
1.5
1.0
0.75
0.45
0.5
0.4
0.28
0.2
0.13
0.12
R1
max
240
180
100
90
90
33
33
31
18
18
14
6
9
9
6
5
5
3
2.5
2.5
2.0
1.5
RL250-020
RL250-030
RL250-040
RL250-050
RL250-060
RL250-080
RL250-090
RL250-100
RL250-110
RL250-120
RL250-145
RL250-180
RL250-200
RL250-300
RL250-400
RL250-500
RL250-600
RL250-800
RL250-1000
RL250-1200
RL250-1500
RL250-2000
I
H
=Hold current: maximum current at which the device will not trip at 25
℃
still air.
I
T
=Trip current: minimum current at which the device will nalways at 25
℃
still air.
V
max
=Maximum voltage device can withstand without damage at rated current.
I
max
=Maximum fault current device can withstand tithout damage at rated voltage.
T
trip
=Maximum time to trip(s) at assigned current.
P
d
=Typical power dissipation: typical amount of power dissipated by the decice when in state air environment.
Ri
min
=Minimum device resistance at 25℃ prior to tripping.
R1
max
=Maximum device resistance is measured one hour post reflow.
Specifications are subject to change without notice.
Please refer to http://
www.ruilon.com.cn
for current information.
Revised: 2018-07-10
Page:2
Positive Thermal Coefficient (PTC)
Solder reflow conditions
Wave Soldering
Soldering Temperature:260
℃
~270
℃
Temperature℃
300
5s max.
250
200
Pre-heating
150
100℃-130℃
100
50
0
Cooling
245℃-260
Soldering
RL250 Series
Soldering Time:≤3sec.
Soldering Position: Resettable fuse wire and the bottom
≥
6mm。
Manual soldering
Soldering Temperature:250℃~280℃
Soldering Time:≤3sec.
Soldering Position: Resettable fuse wire and the bottom
≥
6mm。
0
50
100
150
Time(s)
200
250
Environmental temperature and I
H
,I
T
300
250
200
150
100
50
0
-30
-20
-10
0
10
20
30
40
50
60
70
80
85
I
T
I
H
Specifications are subject to change without notice.
Please refer to http://
www.ruilon.com.cn
for current information.
Revised: 2018-07-10
Page:3
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