The recommended mounting method is to use a screw or clip to secure the resistor to a heat sink or chassis, ensuring good thermal contact. Ohmite recommends using a thermal interface material (TIM) to fill any gaps between the resistor and heat sink.
To calculate power derating, use the following formula: Pd = (Tc - Ta) / θca, where Pd is the power derating, Tc is the case temperature, Ta is the ambient temperature, and θca is the thermal resistance from case to ambient. Consult the datasheet for specific thermal resistance values.
The maximum allowable voltage for the OK1235E is 250V, which is the maximum voltage rating for the resistor. However, it's essential to consider the power rating and derating factors when selecting an operating voltage.
The OK1235E is designed for general-purpose applications and may not be suitable for high-frequency applications. Ohmite recommends using their high-frequency resistors, such as the HFC series, for applications above 100 kHz.
Yes, the OK1235E is RoHS (Restriction of Hazardous Substances) and REACH (Registration, Evaluation, Authorization, and Restriction of Chemicals) compliant, meeting the requirements for lead-free and hazardous substance-free components.
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