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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.