Datasheet > 307C1470

307C1470

更新时间： 2024-10-27 22:45:11

品牌	Logo	应用领域
威世 - VISHAY		/
页数	文件大小	规格书
5页	120K
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PTCR Overcurrent Protection

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307C1470 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：	unknown	ECCN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）：	220 V
电阻：	25 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

307C1470 数据手册

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 (I_H) 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 (I_H) 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%

Hold Current (I_H) = D(T_SW- T_A)

R_PTC

Where:

Fig P-1

= Dissipation Constant

(varies based on disc

size, wire type, &

Typical PTC Current Limiter Application

PTC

coating material)

-10

10 20 30 40 50 60 70 80 90 100 110 120

Ambient Temperature (°C)

T_SW= Switching (Curie)

Temperature of

LOAD

PTCR Material

T_A= Ambient Temperature

_PTC= Resistance of PTCR

at 25°C

Document Number: 23089

Revision 14-May-02

www.vishay.com

ceramite.support@vishay.com

12 3 4 5

中文翻译

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