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2029L Datasheet(PDF) 1 Page - Littelfuse |
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2029L Datasheet(HTML) 1 Page - Littelfuse |
1 / 2 page 22 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: 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 Part Reel Packaging Number Quantity Suffix 2029L Series 2000 PR 3425L Series 1500 DR -40 -30 -20 -10 0 102030405060708090 0 50 100 150 200 Temperature ( °C) Rerating Curve for 2029L /3425L Series OBSOLETE PART For NEW Designs use 1812L series PTC in place of the 2029L Series. |
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