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.

Do not store SMDs where they are exposed to heat or direct sunlight. Otherwise, the packing

material may be deformed or SMDs may stick together, causing problems during mounting.

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

Avoid storage of thermistor in harmful environments like corrosive gases (SOx, Cl etc).

After opening the factory seals, such as polyvinyl-sealed packages, use the SMDs as soon as

possible.

Solder thermistors after shipment from EPCOS within the time specified:

SMDs: 12 months

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.

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.

Mounting

When NTC thermistors are encapsulated with sealing material or overmolded with plastic

material, the precautions given in chapter “Mounting instructions”, “Sealing, potting and

overmolding” must be observed.

Electrode must not be scratched before/during/after the mounting process.

Contacts and housings used for assembly with thermistor have to be clean before mounting.

During operation, the thermistor’s surface temperature can be very high (ICL). Ensure that

adjacent components are placed at a sufficient distance from the thermistor to allow for proper

cooling ot the thermistors.

Ensure that adjacent materials are designed for operation at temperatures comparable to the

surface temperature of the thermistor. Be sure that surrounding parts and materials can

withstand this temperature.

Make sure that thermistors (ICLs) are adequately ventilated to avoid overheating.

Avoid contamination of thermistor surface during processing.

Inrush current limiters

B57238

ICLs

S238

Page 4 of 6

Please read Important notes and

Cautions and warnings at the end of this document.