Cautions and warnings

General

See "Important notes" at the end of this document.

Storage

Store thermistors only in original packaging. Do not open the package before storage.

Storage conditions in original packaging: storage temperature

25

°C ... +45 °C, relative

humidity

≤75% annual mean, maximum 95%, dew precipitation is inadmissible.

Avoid contamination of thermistors surface during storage, handling and processing.

Solder thermistors after shipment from EPCOS within the time specified:

Leaded components: 24 months

Handling

NTC thermistors must not be dropped. Chip-offs must not be caused during handling of NTCs.

Components must not be touched with bare hands. Gloves are recommended.

Avoid contamination of thermistor surface during handling.

In case of exposure of the NTC thermistors to water, electrolytes or other aggressive media,

these media can penetrate the coating and reach the surface of the ceramic. Low-ohmic or

high-ohmic behavior may occur due to the formation of an electrolyte with metals (silver/lead/tin

from metallization or solder). Low-ohmic behavior is caused by electrochemical migration,

high-ohmic behavior by dissolving of the electrode. Ineither case, the functionality of the NTC

thermistors can not be assured.

Bending / twisting leads

A lead (wire) may be bent at a minimum distance of twice the wire’s diameter plus 4 mm from

the component head or housing. When bending ensure the wire is mechanically relieved at the

component head or housing. The bending radius should be at least 0.75 mm.

Twisting (torsion) by 180

° of a lead bent by 90° is permissible at 6 mm from the bottom of the

thermistor body.

Soldering

Use resin-type flux or non-activated flux.

Insufficient preheating may cause ceramic cracks.

Rapid cooling by dipping in solvent is not recommended.

Complete removal of flux is recommended.

Inrush current limiters

B57238S0***M0**

ICLs

S238

Page 10 of 14

Please read Cautions and warnings and

Important notes at the end of this document.