PRF21BB471QB5RA Murata, PRF21BB471QB5RA Datasheet - Page 14

• 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

!Note
Leaded POSISTORr: PTGL series & Chip POSISTORr: PRG series
1. Applications
2. Benefits
3. Recommended part numbers
12
Application Notes
* Curie Point means the temperature at which the resistance value reaches twice the resistance at 25 C.
Please ask for details.
Type
SMD
Lead
type
type
Overheat/Overcurrent Protection for High Brightness LED
POSISTORr is an effective solution to protect the LED against overheat and overcurrent situation.
(1) LED lighting instruments (Appliances, Automotive etc.)
(1) Posistor installed in series with LED provides both
(2) No additional driver IC or software required
Choose an appropriate part number having max. voltage
and resistance value. Review the protective threshold
• 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.
overheat and overcurrent protection
PRG21BC0R6MM1RA
PRG21BC0R2MM1RA
PRG21BC1R0MM1RA
PRG21BC2R2MM1RA
PRG21BC3R3MM1RA
PRG21BC6R8MM1RA
PRG21BC4R7MM1RA
PTGL04AS100K2N51B0
PTGL04AS100K2B51B0
PTGL05AS3R9K2B51B0
PTGL07AS2R7K2B51B0
PTGL07AS1R8K2B51B0
PTGL09AS1R2K2B51B0
PTGL12AS0R8K2B51B0
PTGL04AS100K3B51B0
PTGL05AS6R8K3B51B0
PTGL07AS3R3K3B51B0
PTGL09AS2R2K3B51B0
PTGL12AS1R2K3B51B0
PTGL07AR220M3P51B0
PTGL07AR8R2M3P51B0
PTGL09AR150M3B51B0
PTGL10AR3R9M3P51B0
PTGL09AR4R7M3B51B0
PTGL10AR3R9M3B51B0
PTGL14AR3R3M3B71B0
Part Number
a) Overcurrent
b) Overheat
Voltage
Max.
(V)
12
16
20
24
24
30
30
30
30
30
30
30
51
51
51
51
51
56
56
56
56
56
56
56
6
6
Current
Max.
6.5
6.0
3.5
5.0
1.5
2.0
3.5
4.5
5.0
6.0
7.0
1.0
1.5
3.0
4.0
5.0
1.0
1.0
1.2
2.0
2.0
2.0
2.5
(A)
10
10
10
Resistance up !!
Resistance up !!
Hold Current
(at +60 C)
(mA)
285
500
220
150
120
100
122
167
269
336
420
556
685
168
197
307
412
592
130
150
210
270
300
380
80
90
Heat up by
overcurrent !
Heat up by
overheat situation !
(3) Automatic reset from protective trip mode
(4) 0603 and 0805 SMD type available (smaller than
current range based on the operating current and
temperature of the LED.
1/2W or 1W chip resistor)
Trip Current
(at -10 C)
1100
2000
1097
1352
1168
(mA)
850
600
480
320
400
240
330
530
663
829
332
388
606
814
240
350
400
550
700
800
980
Resistance
(at +25 C)
0.6 20%
0.2 20%
1.0 20%
2.2 20%
3.3 20%
6.8 20%
4.7 20%
3.9 10%
2.7 10%
1.8 10%
1.2 10%
0.8 10%
6.8 10%
3.3 10%
2.2 10%
1.2 10%
8.2 20%
3.9 20%
4.7 20%
3.9 20%
3.3 20%
10 10%
10 10%
10 10%
22 20%
15 20%
(ohm)
Curie Point
( C) *
130
130
130
130
130
130
130
130
130
130
130
130
120
120
120
120
120
120
120
90
90
90
90
90
90
90
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Details
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Apr.25,2011
R90E.pdf