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| 型号： | PRF21BE471QB5RA |
| 厂商： | Murata Electronics North America |
| 文件页数： | 7/105页 |
| 文件大小： | 0K |
| 描述： | THERMISTOR |
| 标准包装： | 4,000 |
| 系列： | PRF18/21 |
| 在 25°C 时的电阻（欧姆）： | 470 |
| 电阻公差： | ±50% |
| 工作温度： | -20°C ~ 100°C |
| 安装类型： | PCB，表面贴装 |
| 封装/外壳： | 芯片 |
| 供应商设备封装： | * |
| 包装： | * |
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! 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 speci?cations. Therefore, please approve our product speci?cations or transact the approval sheet for product speci?cations before ordering.
R90E.pdf
Mar.4,2014
Basic Characteristics of POSISTOR r
c Basic Characteristics
POSISTOR r has three main characteristics.
1. Resistance - Temperature Characteristics
10
Although there is a negligible difference between the
normal and "Curie Point" temperature, POSISTOR r
shows almost constant resistance-temperature
Resistance - Temperature Characteristic
5
10
10
characteristics. Yet they have resistance-temperature
characteristics that cause resistance to sharply increase
when the temperature exceeds the Curie Point.
The Curie Point (C.P.) is defined as the temperature at
4
3
BD BC BB AR
10
which the resistance value is twice the one at 25°C.
2
10
1
0
50
100
150 200
C.P. (AR: 120°C)
Temperature (°C)
2. Current - Voltage Characteristics (Static Characteristic)
This shows the relation between applied voltage when
voltage applied to POSISTOR r causes balancing of
Current - Voltage Characteristic (Static Characteristic)
10
inner heating and outer thermal dissipation and stabilized
current. This has both a maximum point of current and
3
Ta=25°C
constant output power.
2
10
10
1
0.1
1
10
2
10
Voltage (V)
3. Current - Time Characteristics (Dynamic Characteristic)
This shows the relation between current and time before
inner heating and outer thermal dissipation arrive at
equilibrium state. This features having large initial current
and abruptly continuous attenuating portion.
Current - Time Characteristic (Dynamic Characteristic)
1.5
Ta=25°C
1.0
0.5
Time (sec.)
5
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