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307C1421

更新时间： 2024-02-25 04:32:21
品牌 Logo 应用领域
威世 - VISHAY 电阻器温度相关电阻器NTC温度相关电阻器PTC过载保护
页数 文件大小 规格书
5页 120K
描述
PTCR Overcurrent Protection

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307C1421 技术参数

是否无铅： 含铅是否Rohs认证： 不符合
生命周期：Active包装说明：,
Reach Compliance Code：unknownECCN代码：EAR99
HTS代码：8533.40.80.70风险等级：5.87
安装特点：THROUGH HOLE MOUNT端子数量：2
封装形状：DISK PACKAGE额定（AC）电压（URac）：120 V
电阻：13 Ω电阻器类型：PTC THERMISTOR
子类别：Non-linear Resistors表面贴装：NO
端子位置：RADIAL端子形状：WIRE
热敏电阻器应用：OVERLOAD PROTECTION容差：20%
Base Number Matches：1

307C1421 数据手册

 浏览型号307C1421的Datasheet PDF文件第2页浏览型号307C1421的Datasheet PDF文件第3页浏览型号307C1421的Datasheet PDF文件第4页浏览型号307C1421的Datasheet PDF文件第5页 
307C Overcurrent Thermistors  
Vishay Cera-Mite  
PTCR Overcurrent Protection  
FEATURES:  
A NEW DIMENSION  
Sizes For Your Application - Hold currents from 5 mA to 1.5 A are available  
in sizes from 4 to 22mm.  
The Positive Temperature Coefficient  
Resistor’s (PTC thermistor) unique property  
of dramatically increasing its resistance  
above the curie temperature makes it  
an excellent candidate for overcurrent  
protection applications. Overcurrent  
situations in electronic devices occur  
due to voltage fluctuations, changes in  
load impedance, or problems with system  
wiring. PTC thermistors monitor current in  
series connected loads, trip in the event  
of excess current, and reset after the  
overload situation is removed, creating a  
new dimension of flexibility for designers.  
Better Protection, Maintenance Free - PTCRs reset after an overcurrent  
situation. Protection levels may be set lower than possible with fuses, without  
worrying about nuisance trips.  
Resetting, Non Cycling - Functioning as a manual reset device, PTCR  
overcurrent protectors remain latched in the tripped state and automatically  
reset only after voltage has been removed. This prevents continuous cycling,  
and protects against reclosing into a fault condition.  
Simplified Mounting - PTCRs may be mounted directly inside end use  
equipment. Unlike fuses, no bulky fuseholder or access for user replacement  
is required.  
Ceramic Material Selection - Various curie materials are available to tailor  
hold and trip current operating points.  
Repeatable, No Hysteresis - After resetting, ceramic PTCRs return to the  
initial resistance value, providing repeatable, consistent protection levels.  
Unlike polymer type PTCRs, Vishay Cera-Mite devices exhibit no resistance  
hysteresis application problems.  
APPLICATIONS:  
• Telecommunication Products  
• Electronic Power Supplies  
• Automotive Motor Protection  
• Industrial Control Systems  
Telecom Line Balance - In telecom circuits matched pairs are used to  
maintain line balance. Unlike polymer PTCRs, ceramic devices maintain  
balance after resetting.  
APPLICATION DATA  
This relationship is shown in Fig P-2,  
which provides hold current (IH) derating  
estimates for ambient temperatures in  
excess of 25°C. Five curie materials  
illustrate the design flexibility offered by  
ceramic PTCR’s.  
In a typical current limiter application, the PTC device is connected in series  
with a load impedance (Fig P-1). When current (I) flows, internal I2R losses  
attempt to increase the PTCR’s temperature. To maintain the low resistance  
“on” state, stabilization must occur below the switching temperature, where  
the heat generated (I2R) is balanced by heat lost due to radiation and  
conduction.  
Hold current (IH) is the maximum continuous current at which a PTCR can  
be maintained in a low resistance “on” state while operating at rated ambient  
temperature (typ 25°C). To prevent nuisance tripping, choose the rated hold  
current to be greater than the normal current expected.  
Fig P-2  
PTC Thermistor Overcurrent Protectors  
Ambient Temperature Derating of Hold and  
Trip Currents  
Since heat dissipated by the device is proportional to the ambient temperature,  
hold current must be derated for ambients higher than 25°C according to  
the following relationship:  
140%  
70°C Curie Material  
80°C Curie Material  
120%  
90°C Curie Material  
105°C Curie Material  
120°C Curie Material  
100%  
80%  
60%  
40%  
20%  
0%  
Hold Current (IH) = D(TSW - TA)  
RPTC  
Where:  
Fig P-1  
D
= Dissipation Constant  
(varies based on disc  
size, wire type, &  
Typical PTC Current Limiter Application  
PTC  
coating material)  
-10  
0
10 20 30 40 50 60 70 80 90 100 110 120  
Ambient Temperature (°C)  
AC  
or  
DC  
TSW = Switching (Curie)  
Temperature of  
V
LOAD  
PTCR Material  
TA = Ambient Temperature  
R
PTC= Resistance of PTCR  
at 25°C  
Document Number: 23089  
Revision 14-May-02  
www.vishay.com  
11  
ceramite.support@vishay.com  
12345

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