B57869S302F140 EPCOS Inc, B57869S302F140 Datasheet - Page 6

• Manufacturer Part Number: B57869S302F140
• Description: Thermistors - NTC 3k 3988
• Manufacturer: EPCOS Inc
• Type: NTCr

Specifications of B57869S302F140

• Mounting Style: Through Hole
• Pin Count: 2
• Screening Level: Commercial
• Resistance @ 25c: 3kohm
• Operating Temperature Min Deg. C: 0C
• Operating Temperature Max Deg. C: 70C
• Product Length (mm): Not Requiredmm
• Product Height (mm): 6.5mm
• Product Depth (mm): Not Requiredmm
• Resistance: 3 KOhms
• Tolerance: 1 %
• Termination Style: Radial
• Operating Temperature Range: - 55 C to + 155 C
• Power Rating: 60 mW
• Lead Free Status / RoHS Status: Compliant

Mounting instructions
1
1.1
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:
Bath temperature
Soldering time
Distance from thermistor
Under more severe soldering conditions the resistance may change.
1.2
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.
2
Pressure contacting by means of clamps is particularly suitable for applications involving frequent
switching and high turn-on powers.
3
The leads meet the requirements of IEC 60068-2-21. They may not be bent closer than 4 mm
from the solder joint on the thermistor body or from the point at which they leave the feed-
throughs. During bending, any mechanical stress at the outlet of the leads must be removed. The
bending radius should be at least 0.75 mm.
Tensile strength:
Please read Cautions and warnings and
Important notes at the end of this document.
Temperature measurement
Miniature sensors with bendable wires
Soldering
Leaded NTC thermistors
Leadless NTC thermistors
Clamp contacting
Robustness of terminations (leaded types)
Test Ua1:
Leads
0.25 <
0.35 <
0.50 <
0.80 <
Dip soldering
max. 260 C
max. 4 s
min. 6 mm
0.25 mm =
0.35 mm =
0.50 mm =
0.80 mm = 10.0 N
1.25 mm = 20.0 N
Page 6 of 13
Iron soldering
max. 360 C
max. 2 s
min. 6 mm
1.0 N
2.5 N
5.0 N
B57869S
S869