LITTELFUSE 3425L300DR, 3425L300, 3425L250DR, 3425L250, 3425L200DR Datasheet

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	Reel	Packaging
Number	Quantity	Suffix
3425L Series	1500	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
Current	110
	90
Rated	100
	70
of	80
	60
Percentage
	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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