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WR12W2004FTL是华新科(Walsin)推出的通用型厚膜固定电阻器,属于其WR12W系列主力型号。作为电子电路中最基础的被动元件之一,该型号以「2.00MΩ标准阻值+±1%精度+250mW(1/4W)额定功率」为核心特征,兼顾性能稳定性与成本效益,适配中低功耗电子系统的批量应用。
华新科作为全球被动元件头部厂商,在厚膜电阻领域拥有20余年工艺积累,产品覆盖消费电子、工业控制、汽车电子等多领域。WR12W2004FTL继承了品牌在厚膜电阻上的可靠性优势,符合RoHS、REACH等环保标准,适配现代电子设备的小型化与自动化生产需求。
该型号的电气参数直接决定应用场景的适配性,核心参数及实际意义如下:
标称阻值2.00MΩ(对应电阻代码「2004」,即200×10⁴Ω),精度±1%。这一精度属于「通用精度」范畴:既满足大多数电路对阻值一致性的要求(如分压电路的电压比例控制),又避免了高精度电阻(如±0.1%)的成本溢价,平衡了性能与成本。
250mW(1/4W):是电阻长期连续工作允许的最大功耗。实际应用需结合环境温度降额(如155℃高温下,功率需降至额定值的50%),避免过热导致阻值漂移或失效。
200V:由器件绝缘性能与封装耐压决定。2.00MΩ阻值下,200V对应的工作电流仅100μA(功率20mW),远低于额定功率,因此电压限制是器件安全工作的核心边界(过高电压可能击穿绝缘层)。
±100ppm/℃:表示阻值随温度变化的速率(温度每升1℃,阻值变化±100×10⁻⁶)。以2.00MΩ为例,温度变化100℃时,阻值仅变化±200Ω(±0.01%),这一稳定性足以满足工业、汽车等宽温场景的需求。
WR12W2004FTL采用厚膜工艺制造,具备以下优势:
厚膜电阻通过「丝网印刷+高温烧结」形成电阻膜,相比碳膜电阻更稳定,相比薄膜电阻成本更低,适合批量应用。
-55℃~+155℃:覆盖工业控制(户外设备)、汽车电子(发动机舱附近)等极端温度场景,无需额外温度补偿电路。
适配表面贴装(SMD)工艺,可与其他SMD元件集成,满足现代电子设备小型化、自动化生产的需求(封装尺寸符合行业通用标准,无需特殊治具)。
结合参数特征,该型号的核心应用场景包括:
为确保长期可靠运行,应用时需注意:
工作电压不得超过200V(即使功率未达额定值,过高电压可能击穿绝缘层)。
若应用场景对精度要求高于1%(如精密测量),需结合环境温度计算阻值偏差(如100℃变化下偏差±200Ω),或采用温度补偿电路。
遵循华新科推荐曲线:回流焊峰值温度≤260℃(时间≤10秒),波峰焊温度≤250℃(时间≤5秒),避免高温损坏电阻膜。
WR12W2004FTL是一款高性价比厚膜电阻,以稳定的电气性能、宽温适应性与成本优势,成为工业、汽车、消费电子等领域的常用选型,适合对阻值精度、功率有中等需求的电子电路设计。
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