3425L Datasheet, PDF (1/2 Pages) Littelfuse – Surface Mount PTC

Resettable PTCs
Surface Mount PTC
3425L Series
®
®
• The 3425L Series Resettable devices utilize a unique polymer-based,
Positive Temperature Coefficient (PTC) material to protect electrical
circuits against overcurrent conditions.
• In normal operation, the 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 significantly limiting the flow of
current. However, once the cause of the initial overcurrent condition is
eliminated, the 3425L Series PTC cools down and resets to a low
resistance value permitting the normal current flow to resume.
• The 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
Solderability: Meets EIA specification RS186-9E and IPC/EIA
J-STD-002, and IPC/EIA J-STD-001.
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
3425L Series
Reel
Quantity
1500
Packaging
Suffix
DR
ENVIRONMENTAL SPECIFICATIONS:
Passive Aging: 85°C, 1000 Hours.
Humidity Aging: 85°C, 85% R.H., 100 hours.
Thermal Shock: 85°C / –40°C, 20 times.
125°C / –55°C, 10 times.
Vibration: MIL-STD 202, Method 201. No resistance change.
Mechanical Shock: MIL-STD-202, Method 213 test condition I
(100 g’s, 6 sec.).
Operating/Storage Temperature: –40°C to 85°C Devices should
remain in sealed bags prior to use.
Rerating Curve for 3425L Series
160
150
140
130
120
110
100
90
80
70
60
50
40
30
20
10
0
-40 -30 -20 -10
0 10 20 30 40 50 60 70 80 85
Temperature (°C)
250
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