B57237S229M54 EPCOS Inc, B57237S229M54 Datasheet - Page 8

• Manufacturer Part Number: B57237S229M54
• Description: CURRENT LIMITR INRSH 2.2 OHM 20%
• Manufacturer: EPCOS Inc
• Type: NTCr
• Series: B57237r

Specifications of B57237S229M54

• R @ 25°c: 2.2 Ohm
• Current - Steady State Max: 7A
• Tolerance: ±20%
• Diameter: 0.59" (15mm)
• Lead Spacing: 0.295" (7.50mm)
• Mounting Style: Through Hole
• Pin Count: 2
• Thermal Time Constant: 90s
• Percentage Of Resistance Tolerance @ 25c: ±20
• Product Length (mm): Not Requiredmm
• Product Height (mm): Not Requiredmm
• Resistance: 2.2 Ohms
• Termination Style: Radial
• Operating Temperature Range: - 55 C to + 170 C
• Current Rating: 7 Amps
• Dimensions: 15 mm Dia. x 7 mm W x 22 mm H
• Power Rating: 3.1 W
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• R @ Current: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: B57237S 229M 54; B57237S0229M054

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.
Solderability (test to IEC 60068-2-58)
Preconditioning: Immersion into flux F-SW 32.
Evaluation criterion: Wetting of soldering areas 95%.
Solder
SnAg (3.0 ... 4.0), Cu (0.5 ... 0.9)
1.1.1
Preconditioning: Immersion into flux F-SW 32.
Evaluation criterion: Leaching of side edges 1/3.
Solder
SnAg (3.0 ... 4.0), Cu (0.5 ... 0.9)
Please read Cautions and warnings and
Important notes at the end of this document.
Inrush current limiters
ICLs
Soldering
Leaded NTC thermistors
Resistance to soldering heat (test to IEC 60068-2-58)
Dip soldering
max. 260 C
max. 4 s
min. 6 mm
Page 8 of 15
Bath temperature ( C)
245 3
Bath temperature ( C)
260
Iron soldering
max. 360 C
max. 2 s
min. 6 mm
5
Dwell time (s)
3
Dwell time (s)
10
B57237
S237