B57891M0682000 datasheet(22/28 Pages) EPCOS | NTC thermistors for temperature measurement

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Sealing and potting

When thermistors are sealed, potted or overmolded, there must be no mechanical stress caused

by thermal expansion during the production process (curing / overmolding process) and during

later operation. The upper category temperature of the thermistor must not be exceeded. Ensure

that the materials used (sealing / potting compound and plastic material) are chemically neutral.

Cleaning

Washing processes may damage the product due to the possible static or cyclic mechanical

loads (e.g. ultrasonic cleaning). They may cause cracks to develop on the product and its parts,

which might lead to reduced reliability or lifetime.

Storage

In order to maintain their solderability, thermistors must be stored in a non-corrosive atmosphere.

Humidity, temperature and container materials are critical factors.

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

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

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

The components should be left in the original packing. Touching the metallization of unsoldered

thermistors may change their soldering properties.

Storage temperature:

°C up to 45 °C

Relative humidity (without condensation):

≤75% annual mean

<95%, maximum 30 days per annum

Solder the thermistors listed in this data book after shipment from EPCOS within the time speci-

fied:

SMDs with nickel barrier termination:

12 months

SMDs with AgPd termination:

6 months

Leaded components:

24 months

Temperature measurement and compensation

B57891M

Leaded NTC thermistors, lead spacing 2.5 mm

M891

Page 22 of 28

Please read Cautions and warnings and

Important notes at the end of this document.

B57891M0682000 Datasheet(PDF) 22 Page - EPCOS