The thermal resistance of the TFSD270RJE is not explicitly stated in the datasheet, but according to Ohmite's application notes, the thermal resistance (RθJA) is approximately 10°C/W for this specific model.
While the TFSD270RJE is primarily designed for low-frequency applications, it can be used in high-frequency applications up to 100 kHz with some caution. However, the inductance and capacitance of the resistor may affect its performance at higher frequencies, and additional analysis or simulation may be necessary to ensure suitability.
The TFSD270RJE has a maximum working voltage of 250V, but it's essential to consider the voltage coefficient of resistance (VCR) and the resistor's power rating when operating at high voltages. Consult Ohmite's application notes or contact their technical support for guidance on high-voltage applications.
To ensure proper derating, follow Ohmite's derating guidelines, which typically involve reducing the power rating by 1.5% to 2% per degree Celsius above the rated temperature (125°C for the TFSD270RJE). Additionally, consider the resistor's thermal resistance and the ambient temperature when calculating the derating factor.
The TFSD270RJE has a moisture sensitivity level (MSL) of 1, indicating it can withstand normal humidity levels. However, exposure to extreme humidity or wet conditions may affect its performance and reliability. If you plan to use the resistor in a humid or wet environment, consider applying a conformal coating or using a resistor with a higher MSL rating.
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TFSD270RJE Overview
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