PRF21BE471QB2RA Murata, PRF21BE471QB2RA Datasheet - Page 92

• Manufacturer Part Number: PRF21BE471QB2RA
• Description: Thermistors - PTC 470 OHM 32V
• Manufacturer: Murata
• Type: PTCr
• Series: PRF21r

Specifications of PRF21BE471QB2RA

• Resistance: 470 Ohms
• Tolerance: 5 %
• Termination Style: SMD/SMT
• Operating Temperature Range: - 20 C to + 110 C
• Current Rating: 0.1 mAmp
• Dimensions: 1.25 mm W x 2 mm L
• Voltage: 140 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

12
!Note
90
!Caution/Notice
(2) Allowable Soldering Temperature and Time
(3) Standard Temperature Profile for Soldering
(4) There may be a risk of unexpected failures
Continued from the preceding page.
(a) Solder within the temperature and time
(b) The excessive soldering conditions may cause
(c) In case of repeated soldering, the accumulated
(a) Insufficient preheating may cause a crack on
(b) Rapid cooling by dipping in solvent or by other
(tombstone, insufficient solder-wetting, etc.) in the
mounting process, caused by the mounting conditions.
Please make sure that this product is correctly
mounted under specified mounting conditions.
• Please read rating and !CAUTION (for storage, operating, rating, soldering, mounting and handling) in this catalog to prevent smoking and/or burning, etc.
• This catalog has only typical specifications because there is no space for detailed specifications. Therefore, please review our product specifications or consult the approval sheet for product specifications before ordering.
combinations, indicated by the slanted lines in the
graphs at right.
dissolution of metallization or deterioration of solder-
wetting on the external electrode.
ceramic body. Difference between preheating
temperature and maximum temperature in the profile
should be 100D.
means is not recommended.
soldering time should be within the range shown
below figure. ( For example, Reflow peak temperature:
260 C, twice – > The accumulated soldering time at
260 C is within 30 sec. )
Allowable Reflow Soldering Temp. and Time
Reflow Soldering Conditions
200
100
0
* In case of repeated soldering, the accumulated soldering
time should be within the range shown above figure (2).
Preheating: 150T10 C, 1 to 2 minutes
Soldering: 250 C, 20 seconds
280
270
260
250
240
230
220
210
Preheating (in air)
0
10
20 30 40 50 60 70
1 to 2 min.
Time (sec.)
Soldering
*20 sec.
250 C
80
90
100
Gradual cooling
110
(in air)
Apr.25,2011
R90E.pdf