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NTCG164LH104HT1 是 TDK 推出的 SMD 型负温度系数(NTC)热敏电阻器,阻值标称为 100 kΩ(25℃),适用于精密温度测量与温度补偿场合。元件尺寸为 0603(1.6 × 0.8 × 0.8 mm),小型化封装便于用于空间受限的便携与消费类电子产品。
NTCG164LH104HT1 在 25℃ 时阻值为 100 kΩ。B 值为温度-电阻关系的重要参数,可用下列 B 参数公式描述元件在两个温度点间的电阻变化: 1/T = 1/T0 + (1/B)·ln(R/R0)
其中 T 与 T0 单位为 K(开尔文),R 与 R0 单位为 Ω。
例如,使用 B(25/50)=4485 K,可计算 50℃ 时电阻:约 31.2 kΩ;使用 B(25/85)=4550 K,可得 85℃ 时电阻约 7.8 kΩ。
耗散系数 1 mW/℃ 表示器件在静态条件下每吸收 1 mW 功率约引起 1℃ 温升。厂家限定最大稳态电流 100 μA,对 100 kΩ 的元件而言对应功率约 1 mW(I^2·R),因此在常见测量电流下能将自发热引起的测量误差控制在可接受范围。
常见接法为与上拉/下拉电阻构成分压后送入 ADC 测量。若以 3.3 V 为电源、上拉电阻取 100 kΩ,在 25℃ 时分压点约 1.65 V。元件在 25℃ 附近的阻值温度系数可由下式估算: dR/dT ≈ -R·B/T^2
带入 R=100 kΩ、B≈4485 K、T=298.15 K,可得 dR/dT ≈ -5.0 kΩ/℃。对应电压敏感度在该工作点约 -44 mV/℃(以 100 kΩ 上拉、3.3 V 为例),适合中等分辨率的 ADC 直接采样。
该器件以其高阻值、小体积与良好的 B 值稳定性,适合对尺寸与功耗有严格限制但仍需较高温度灵敏度的应用。
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