2029L Datasheet, PDF (1/2 Pages) Littelfuse – SURFACE MOUNT PTC

RESETTABLE PTCs
SURFACE MOUNT PTC
2029L/3425L Series
®
® TUV
PRODUCT SERVICE
• The 2029L/3425L Series Resettable devices utilize a
ENVIRONMENTAL SPECIFICATIONS:
unique polymer-based, Positive Temperature Coefficient
Passive Aging: 85°C, 1000 Hours. ±5% typical resistance
(PTC) material to protect electrical circuits against over-
change.
current conditions.
Humidity Aging: 85°C, 85% R.H., 1000 hours. ±5% typi-
• In normal operation, the 2029L/3425L Series PTC has
cal resistance change.
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-
Thermal Shock: 85°C / –40°C, 20 times. ±10% typical
resistance change.
Vibration: MIL-STD 202, Method 201. No resistance
change.
icantly limiting the flow of current. However, once the
Mechanical Shock: MIL-STD-202, Method 213 test condi-
OBSOLETE ^{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.
tion I (100 g’s, 6 sec.). No resistance change.
Max. Surface Temperature: 125°C
Operating/Storage Temperature: –40°C to 85°C
Rerating Curve for 2029L /3425L Series
AGENCY APPROVALS: Recognized under the
200
Components Program of Underwriters Laboratory and the
PART ^{Component Acceptance Program of CSA. TUV approved.}
150
AGENCY FILE NUMBERS: UL E183209, CSA LR 108832
PHYSICAL SPECIFICATIONS:
100
Materials: Terminal Material: Tin Plated Brass to
MIL-T-10727B
50
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:
0
-40 -30 -20 -10
0 10 20 30 40 50 60 70 80 90
Temperature (°C)
For NEW Designs use 1812L series PTC in place of the 2029L
Part
Number
Reel Packaging
Quantity
Suffix
Series.
2029L Series
2000
PR
3425L Series
1500
DR
22