FAQ - HW / HS 系列 霍尔元件

表面贴装・DIP型HW系列的1号引脚在哪里?

 [Q0396]

回答

霍尔元件即使旋转180°也能得到规格内的特性,表面贴装的情况下右上角是1号引脚,DIP型的情况下左上角是1号引脚。

订购HW系列霍尔元件时如何指定灵敏度等级?

 [Q0397]

回答

采用灵敏度等级为3级以上的超高灵敏度型HW霍尔元件做设计。
例)ABC、BCD、CDE、EFG等级。
高灵敏度的HW-105C只有QR等级,而HS-0111没有灵敏度等级。

需要限位电阻吗? 如何决定电阻值?

 [Q0398]

回答

HW・HS系列霍尔元件在高温下电阻值会急剧下降而造成烧损,因此需要特别驱动电路。一般情况下,为了防止烧损,会对霍尔元件串联电阻。决定电阻值的方法请参照这里。

没有限制电阻也可以使用吗?

 [Q0399]

回答

可以使用。但是,可以施加的电压和电流与有限制电阻的情况相比会大幅降低。具体内容请参照这里。

超高灵敏度型和高灵敏度高线性型的区别是什么?

 [Q0400]

回答

超高灵敏度类型的内部装有磁性材料,在低磁场下输出会变高,但当磁性体饱和时,倾斜会发生变化,输出电压与磁通密度不成比例(参照下图)。因此,这种类型不适合测量磁通密度,用于检测有无磁石。

高灵敏度高线性型由于不含磁性物质,所以可以在大范围内获得线性输出特性。此外,求线性时,请在恒定电流驱动下使用。恒定电压驱动受磁阻效应影响,与磁通密度成比例。

Related FAQ - 霍尔元件

霍尔元件的等效电路是怎样的?

 [Q0388]

回答

四个电阻的桥接电路。

霍尔元件有极性吗?

 [Q0389]

回答

在霍尔元件目录的外形尺寸图上有记载。

例如HW-101A,在1号引脚上加上+,在3号引脚上加上-的输入,将N极的磁铁靠近封装表面时,2号引脚上+,4号引脚上-输出。如果S极磁铁靠近封装表面时,输出极性相反,2号引脚-,4号引脚+输出。

霍尔元件怎么驱动?

 [Q0390]

回答

请参照以下。

霍尔元件的输出怎么放大?

 [Q0391]

回答

请参照以下。

霍尔元件的引脚镀金是什么?

 [Q0392]

回答

HW-300B和HW-32B有镀银和镀锡。其他都是镀锡。全部都支持RoHS。(2010年5月)

对应无卤素吗?

 [Q0393]

回答

也有对应的等级。详情请咨询。

相对于磁通量密度线性最好的霍尔元件是哪个?

 [Q0394]

回答

HG系列霍尔元件。定电流驱动时,线性在0.5T以下,不到2%。

霍尔元件的特性有滞后现象吗?

 [Q0395]

回答

超高灵敏度型的HW霍尔元件内部有磁性体,因此存在滞回性。

FAQ

HW / HS Series : Hall Ellements

HW / HS

[Q0396]
・For the surface mounting DIP type HW series, where is No.1 pin?
A.
・Because the hall element can maintain characteristics within the specified range even if it turns by 180°, the upper right pin is No. 1 pin for the surface mounting type and the upper left pin is No. 1 pin for the DIP type.
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[Q0397]
・How should we specify the sensitivity rank when ordering HW series hall elements?
A.
・Specify the sensitivity rank 3 or above for the design using ultra-sensitive type HW series hall elements.
Ex) ABC, BCD, CDE, EFG ranks
Highly sensitive types HW-105C and HW-108C have the sensitivity rank QR only, and HS-0111 has no sensitivity rank.
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[Q0398]
・How should we determine the value of the limiting resistor.
A.
・The resistor values of HW series and HS series hall elements drop quickly at high temperature. Therefore, they are easily subject to burnout and care should be taken of the drive circuit. In general, a resistor is added in series with the hall element to prevent burnout. Click here to see how to determine the resistor value.
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[Q0399]
・Can we use it without the limiting resistor?
A.
・Yes, you can. However, the voltage and current are considerably reduced compared with those with limiting resistors. Click here for the details.
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[Q0400]
・What is the difference between the ultra-sensitive type and highly sensitive high linearity type?
A.
・The ultra-sensitive type has a magnetic core inside of it, so the output becomes higher at low magnetic field, but when the magnetic core reaches magnetic saturation, the tilting direction changes and the output voltage is not proportional to the magnetic flux density. (Refer to the figures below.) Therefore, this type is not suitable for the measurement of the magnetic flux density, then used to detect presence of the magnet.
Because the highly sensitive high linearity type has no magnet core inside of it, it can obtain the linear output characteristics in wide range. For your information, when requiring the linearity, use it in the constant current drive. The constant voltage drive is affected by the magnetic resistance effect, so it is not proportional to the magnetic flux density.
fig
fig
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