RESETTABLE PTCs
SURFACE MOUNT PTC
2029L/3425L Series
®
®
TUV
PRODUCT SERVICE
• The 2029L/3425L Series Resettable devices utilize a
unique polymer-based, Positive Temperature Coefficient
(PTC) material to protect electrical circuits against over-
current conditions.
• In normal operation, the 2029L/3425L Series PTC has
many conductive paths and a very low resistance. In an
overcurrent condition, the temperature of the polymer
material rises. This dramatically reduces the conductive
paths resulting in an immediate rise in resistance. In this
condition, the device provides circuit protection by signif-
icantly limiting the flow of current. However, once the
cause of the initial overcurrent condition is eliminated,
the 2029L/3425L Series PTC cools down and resets to a
low resistance value permitting the normal current flow
to resume.
• The 2029L/3425L Series are surface mountable.
AGENCY APPROVALS:
Recognized under the
Components Program of Underwriters Laboratory and the
Component Acceptance Program of CSA. TUV approved.
AGENCY FILE NUMBERS:
UL E183209, CSA LR 108832
PHYSICAL SPECIFICATIONS:
Materials:
Terminal Material: Tin Plated Brass to
MIL-T-10727B
Lead Solderability:
Meets EIA specification RS186-9E
Device Labeling:
Device is marked with the letter ‘L’,
amperage rating and date code.
Packaging:
Packaged in tape and reel carrier per
EIA 481-2 standard
Standard reel quantities:
Part
Number
2029L Series
3425L Series
Reel
Quantity
2000
1500
Packaging
Suffix
PR
DR
OBSOLETE
PART
Rerating Curve for 2029L /3425L Series
200
Percentage of Rated Current
150
100
50
0
-40
-30
-20
-10
0
10
20
30
40
Temperature (°C)
50
60
ENVIRONMENTAL SPECIFICATIONS:
Passive Aging:
85°C, 1000 Hours. ±5% typical resistance
change.
Humidity Aging:
85°C, 85% R.H., 1000 hours. ±5% typi-
cal resistance change.
Thermal Shock:
85°C / –40°C, 20 times. ±10% typical
resistance change.
Vibration:
MIL-STD 202, Method 201. No resistance
change.
Mechanical Shock:
MIL-STD-202, Method 213 test condi-
tion I (100 g’s, 6 sec.). No resistance change.
Max. Surface Temperature:
125°C
Operating/Storage Temperature:
–40°C to 85°C
70
80
90
For NEW Designs use 1812L series PTC in place of the 2029L
Series.
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RESETTABLE PTCs
SURFACE MOUNT PTC
2029L/3425L Series
Dimensions (Inches)
B
D
A
Recommended Pad Layout (Inches)
All dimensions are nominal.
Average Time Current Curves
.300A
.500A
.750A
1.00A
1.25A
1.50A
2.00A
2.50A
100
MARKING
E
F
.120
.020-.035
.025
*
.025
C
10
*0.010 for 2029L050
Series
2029L
3425L
RECOMMENDED REFLOW CONDITIONS:
(IR, Forced Air Convection, Vapor Phase)
Devices are not designed to be wave soldered.
OBSOLETE
PART
A
.214 max.
.264 max.
B
.314 max.
.374 max.
C
.090
.145
D
.120
.180
E
.090
.090
F
.380
.420
1
0.1
0.01
0.1
1
10
CURRENT IN AMPERES
TIME IN SECONDS
100
ORDERING INFORMATION:
Maximum Time
To Trip
Catalog
Number
2029L030
2029L050
2029L075
2029S100
2029L100
2029L125
3425L150
3425L200
3425L250
2029L260
I
hold
I
trip
V
max
I
max
P
d
R
IL
R
AT
=
=
=
=
=
=
=
I
hold
(A)
0.30
0.50
0.75
1.10
1.10
1.25
1.50
2.00
2.50
2.60
I
trip
(A)
0.6
1.0
1.5
2.2
2.2
2.5
3.0
4.0
5.0
5.2
V
max
(Vdc)
60
60
30
15
30
15
15
15
15
6.0
I
max
(A)
10
10
40
40
40
40
40
40
40
40
P
d
max.
(W)
1.7
1.7
1.7
1.7
1.7
1.7
1.9
1.9
1.9
1.7
Current
(A)
1.5
2.5
8.0
8.0
8.0
8.0
8.0
8.0
8.0
8.0
Time
(Sec)
3.0
4.0
0.3
0.5
0.5
2.0
5.0
12.0
25.0
20.0
Resistance
R
IL
(Ω)
1.200
0.350
0.350
0.120
0.120
0.070
0.060
0.050
0.035
0.025
R
AT
(Ω)
4.80
1.40
1.00
0.48
0.48
0.25
0.25
0.13
0.09
0.075
Hold Current: maximum current device will sustain for 4 hours without tripping in 20°C still air.
Trip Current: minimum current at which the device will trip in 20°C still air.
Maximum voltage device can withstand without damage at rated current (I
max
)
Maximum fault current device can withstand without damage at rated voltage (V )
max
Power dissipated from device when in the tripped state at 20°C still air.
Minimum resistance of device in initial (un-soldered) state.
Maximum resistance of device at 20°C measured one hour after tripping or reflow soldering of 260°C for 20 sec.
CAUTION: Operation beyond the specified ratings may result in damage and possible arcing and flame.
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Embedded System
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