Homedatasheet2029L050

2029L050 Datasheet

Surface Mount PTC
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Description

Features, Applications

The 2029L/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 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 significantly 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

ENVIRONMENTAL SPECIFICATIONS: Passive Aging: 85�C, 1000 Hours. �5% typical resistance change. Humidity Aging: 85�C, 85% R.H., 1000 hours. �5% typical resistance change. Thermal Shock: �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 condition I (100 g's, 6 sec.). No resistance change. Max. Surface Temperature: 125�C Operating/Storage Temperature: to 85�C

RECOMMENDED REFLOW CONDITIONS: (IR, Forced Air Convection, Vapor Phase) Devices are not designed to be wave soldered.

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 (Imax) 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.

Features

Parameters

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Manufacturer information

LITTELFUSE

Littelfuse offers innovative circuit protection solutions. Wherever one looks, Littelfuse is there. Streetlights, office buildings, cars, trucks, factories, computers, heating and cooling systems, electronic games, telecommunications equipment, even the satellites in the sky are protected by Littelfuse circuit protection products.

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