【产品】汽车级露天式电流采样电阻,阻值低至1mΩ
OARS系列(OARS1,OARS3,OARS-XP,OARS-1Z)是TT Electronics推出的一款符合AEC-Q200标准,表面贴装的采样电阻, 其有针对热膨胀的弹性导线,露天式的设计利于PCB的散热。除此之外,其电阻值可低至1mΩ,元件TCR系数为±20ppm/°C,版型为零欧65A的跳线版本。
OARS系列电阻针对不同型号有不同的电子特性。OARS1的电阻范围在0.002Ω~0.05Ω,OARS3的电阻范围在0.002Ω~0.015Ω,OARS-XP的电阻范围在0.001Ω~0.025Ω。所有OARS系列电阻环境温度范围均为-55°C 至160°C。其它更多电子特性如图1所示:
图1 OARS系列电子特性
OARS系列更多性能数据如图2所示:
图2 OARS性能数据
如图3所示是对OARS进行热力学性能测试,这些热像图是在25°C下的静止空气环境条件下拍摄的,元件均安装在如下定义的垂直标准测试板上:
图3 OARS系列部分热像图
JEDEC标准电路板:
图4 JEDEC标准电路板
2寸(50.8mm)方形FR4,2个外部电源层,2盎司(70μ)铜;
1寸(25.4mm)方形盘裸露在外,2个内部信号层,1盎司(35μ)铜(持续层);
与普通平板芯片版型对比,OARS的版型使得与热点保持热力学距离焊接和减少不必要的热量输送到PCB板中。其他欧姆值和功耗的热像图可根据要求提供。
开尔文(四线)检测法
对于高精度应用,推荐使用开尔文(四线)检测法。 如图5所示来说明设计原理。电流的连接要做成是两对较大的焊盘点,而电压感测连接是两个较小且位于中央焊盘点。
图5 开尔文(四线)检测法
如图6所示,是用于测量未安装零件的标准4终端探头位置。
图6 4终端探头位置
OARS系列采用铜终端焊接到电阻合金带而制成。电阻值通过控制其宽度进行调整,而不需要打磨或对切口进行修整。无铅终端由96%锡/ 4%银合金所构成。值得注意的是在任何温度或过载条件下,电阻均不会燃烧或发射白炽颗粒。这些部件的图例标有欧姆值和偏差代码。
OARS系列有以下两种part number:
图7 European及USA版型
OARS系列的特点:
·AEC-Q200标准;
·TCR系数为±20ppm/°C;
·电感<10nH;
·露天式设计;
·无铅并兼容RoHS标准;
·环境温度范围为-55°C 至160°C;
OARS系列的应用:
·电流采样电阻
·贴片电阻
·汽车级电阻
·汽车电子
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TT Electronics (TT)电阻器选型指南
目录- Technology and Product Selector Guides Current Sense Resistors High Value/Voltage Resistors Surge/Pulse Resistors High Power Resistors Precision/Fusible Resistors High Reliability Resistors Temperature Sense & Thermal Management Resistors Zero-Ohm Jumper & General Purpose Resistors Colour Code for Band-marked Resistors
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目录- AEC-Q200 认证的电阻
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服务
可定制分流器电阻范围20uΩ~100uΩ,可自由设计铜排形状尺寸,电镀:镀锡/镀镍。支持RoHS指令 、AEC-Q200。认证资格:IATF16949;ISO9001;检测精度:0.1%。
最小起订量: 100个 提交需求>
可定制变压器电压最高4.5KV,高频30MHz;支持平面变压器、平板变压器、OBC变压器、DCDC变压器、PLC信号变压器、3D电源、电流变压器、反激变压器、直流直流变压器、车载充电器变压器、门极驱动变压器等产品定制。
最小起订量: 100000 提交需求>
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