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B57220K0212A003 Datasheet(PDF) 5 Page - TDK Electronics

Part No. B57220K0212A003
Description  Leadless NTCs
Download  17 Pages
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Maker  TDK [TDK Electronics]
Homepage  http://www.tdk.com
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B57220K0212A003 Datasheet(HTML) 5 Page - TDK Electronics

 
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Mounting instructions
1
Soldering
1.1
Leaded NTC thermistors
Leaded thermistors comply with the solderability requirements specified by CECC.
When soldering, care must be taken that the NTC thermistors are not damaged by excessive
heat. The following maximum temperatures, maximum time spans and minimum distances have
to be observed:
Dip soldering
Iron soldering
Bath temperature
max. 260
°C
max. 360
°C
Soldering time
max. 4 s
max. 2 s
Distance from thermistor
min. 6 mm
min. 6 mm
Under more severe soldering conditions the resistance may change.
1.2
Leadless NTC thermistors
In case of NTC thermistors without leads, soldering is restricted to devices which are provided
with a solderable metallization. The temperature shock caused by the application of hot solder
may produce fine cracks in the ceramic, resulting in changes in resistance.
To prevent leaching of the metallization, solder with silver additives or with a low tin content
should be used. In addition, soldering methods should be employed which permit short soldering
times.
1.3
SMD NTC thermistors
SMD NTC thermistors can be provided with a nickel barrier termination or on special request with
silver-palladium termination. The usage of mild, non-activated fluxes for soldering is recommend-
ed as well as a proper cleaning of the PCB.
Nickel barrier termination
The nickel barrier layer of the silver/nickel/tin termination (see figure 1) prevents leaching of the
silver base metalization layer. This allows great flexibility in the selection of soldering parameters.
The tin prevents the nickel layer from oxidizing and thus ensures better wetting by the solder. The
nickel barrier termination is suitable for all commonly-used soldering methods.
Note: SMD NTCs with AgPd termination are not approved for lead-free soldering.
Figure 1
SMD NTC thermistors, structure of nickel barrier
termination
Temperature measurement and compensation
B57220K
Leadless NTCs
K220
Page 5 of 17
Please read Cautions and warnings and
Important notes at the end of this document.


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