PRF21BB471QB5RA Murata, PRF21BB471QB5RA Datasheet - Page 82

• Manufacturer Part Number: PRF21BB471QB5RA
• Description: Thermistors - PTC 470 Ohm 50% 32volts
• Manufacturer: Murata
• Type: PTCr

Specifications of PRF21BB471QB5RA

• Resistance: 470 Ohms
• Tolerance: 50 %
• Termination Style: SMD/SMT
• Operating Temperature Range: - 20 C to + 130 C
• Dimensions: 1.25 mm W x 2 mm L x 0.9 mm H
• Voltage: 32 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

12
!Note
80
Resistance - Temperature Characteristics
Overheat Protection Circuit
Resistance - Temperature Characteristics Range (Ref. Only)
• 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.
10
10
10
10
4
3
2
20
10
10
10
10
PTH
1
4
3
2
20
0
PTF_04BH471Q2N34B0
0
R
R
1
2
20
Thermal
Connection
20
40
Temperature (˚C)
Temperature (˚C)
40
BH
BG
60
BF
BE
60
BD
BC
R
R
BB
E
L
80
80
100
100
120
120
Vcc
140
140
Example of Thermal Response Time
Overheat Sensing Circuit
Relation between resistance change and time after POSISTORr
PTFM04BE222Q2N34B0 is installed on the part heated at a constant
temperature of 90 C (3mm thick alminum sheet) is shown in the figure above.
PTH
10
10
10
10
100
4
3
2
20
80
60
40
20
0
Operating Time of POSISTORr
0
R
1
0
PTF_04BG471Q2N34B0
10
20
R
40
20
R
Temperature (˚C)
R
L1
E1
L2
Aluminum plate
T=90 C constant
60
PTFM04BE222Q2N34B0
POSISTORr
Screw
Time (sec.)
30
Continued on the following page.
80
40
R
100
E2
Load
R meter
50
120
Heater
Vcc
140
60
Apr.25,2011
R90E.pdf