PRF18BA471QB5RB Datasheet, PDF (14/104 Pages) Murata Manufacturing Co., Ltd. – POSISTOR for Circuit Protection

!Note • 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. Therefore, please approve our product specifications or transact the approval sheet for product specifications before ordering.
Application Notes
R90E.pdf
Sep.24,2012
c Overheat/Overcurrent Protection for High Brightness LED
Leaded POSISTORr: PTGL series & Chip POSISTORr: PRG series
1. Applications
POSISTORr is an effective solution to protect the LED against overheat and overcurrent situation.
(1) LED lighting instruments (Appliances, Automotive etc.)
a) Overcurrent
Resistance up !!
b) Overheat
Heat up by
overcurrent !
Resistance up !!
Heat up by
overheat situation !
2. Benefits
(1) Posistor installed in series with LED provides both
overheat and overcurrent protection
(2) No additional driver IC or software required
(3) Automatic reset from protective trip mode
(4) 0603 and 0805 SMD type available (smaller than
1/2W or 1W chip resistor)
3. Recommended part numbers
Choose an appropriate part number having max. voltage
and resistance value. Review the protective threshold
current range based on the operating current and
temperature of the LED.
Type
Part Number
SMD
type
Lead
type
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
Max.
Voltage
(V)
6
6
12
16
20
30
30
30
30
30
30
30
30
30
51
51
51
51
51
56
56
56
56
56
56
56
Max.
Current
(A)
10
10
10
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
Hold Current
(at +60 °C)
(mA)
285
500
220
150
120
80
100
122
167
269
336
420
556
685
168
197
307
412
592
90
130
150
210
270
300
380
Trip Current
(at -10 °C)
(mA)
1100
2000
850
600
480
320
400
240
330
530
663
829
1097
1352
332
388
606
814
1168
240
350
400
550
700
800
980
* Curie Point means the temperature at which the resistance value reaches twice the resistance at 25°C.
Please ask for details.
Resistance
(at +25 °C)
(ohm)
0.6 ±20%
0.2 ±20%
1.0 ±20%
2.2 ±20%
3.3 ±20%
6.8 ±20%
4.7 ±20%
10 ±10%
10 ±10%
3.9 ±10%
2.7 ±10%
1.8 ±10%
1.2 ±10%
0.8 ±10%
10 ±10%
6.8 ±10%
3.3 ±10%
2.2 ±10%
1.2 ±10%
22 ±20%
8.2 ±20%
15 ±20%
3.9 ±20%
4.7 ±20%
3.9 ±20%
3.3 ±20%
Curie Point
(°C) *
90
90
90
90
90
90
90
130
130
130
130
130
130
130
130
130
130
130
130
120
120
120
120
120
120
120
More
Details
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