Bourns provides a recommended PCB layout in their application note AN204, which includes guidelines for pad layout, trace width, and spacing to ensure optimal performance and minimize parasitic effects.
To handle the high current rating of the SRN8040HA-6R8M, ensure that the PCB traces and pads are designed to handle the maximum current rating. Use thick copper traces (at least 2 oz) and wide pads to minimize resistance and heat generation. Additionally, consider using multiple vias to connect the inductor pads to the internal layers to reduce thermal resistance.
The self-resonant frequency (SRF) of the SRN8040HA-6R8M is not explicitly stated in the datasheet. However, according to Bourns' application note AN203, the SRF can be estimated using the following formula: SRF ≈ 1 / (2 * π * √(L * C)), where L is the inductance and C is the parasitic capacitance. For the SRN8040HA-6R8M, the estimated SRF is around 150 MHz.
The SRN8040HA-6R8M is rated for operation up to 155°C. However, the inductor's performance and lifespan may degrade at high temperatures. If your application requires operation above 125°C, consider using a high-temperature-rated inductor or consulting with Bourns' technical support for guidance on derating the component.
To ensure proper soldering, follow Bourns' recommended soldering profile, which includes a peak temperature of 260°C and a dwell time of 10-30 seconds. Use a solder with a high melting point (e.g., SAC305) and ensure the PCB pads are clean and free of oxidation. Apply a small amount of solder paste to the pads and use a reflow oven or hot air gun to solder the inductor.
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SRN8040HA-6R8M Overview
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