PRF18BA471QB5RB Datasheet, PDF (85/104 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.
R90E.pdf
Sep.24,2012
c Resistance - Temperature Characteristics
10⁴
BB
BC
BD
10³
BE
BF
BG
BH
10²
10
c Example of Thermal Response Time
Operating Time of POSISTORr
100
80
PTFM04BE222Q2N34B0
POSISTORr R meter
60
Screw
40
Heater
Aluminum plate
T=90°C constant
20
1
–20 0
20 40 60 80 100 120 140
Temperature (°C)
0
0
10
20
30
40
50
60
Time (sec.)
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.
c Overheat Protection Circuit
+Vcc
R1
RL
PTH
Thermal
Connection
c Overheat Sensing Circuit
RL1
R1
RL2
+Vcc
RE2
R2
RE
PTH
Load
RE1
c Resistance - Temperature Characteristics Range (Ref. Only)
PTF_04BH471Q2N34B0
10⁴
PTF_04BG471Q2N34B0
10⁴
10³
10³
10²
10²
10
–20 0
20 40 60 80 100 120 140
Temperature (°C)
10
–20 0
20 40 60 80 100 120 140
Temperature (°C)
Continued on the following page.
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