Part Details for 1239AS-H-4R7M by TOKO Inc

The recommended land pattern for the 1239AS-H-4R7M inductor is a rectangular pad with a size of 3.5mm x 2.5mm, with a 1.5mm x 1.5mm thermal pad in the center. The pad should be solder-mask defined and have a non-solder-mask-defined area of 0.5mm around the perimeter.

The 1239AS-H-4R7M inductor has a maximum operating temperature of 125°C. To ensure reliable operation, it's essential to provide adequate thermal relief by using a thermal pad or via to dissipate heat. A minimum of 2-3 thermal vias with a diameter of 0.3mm to 0.5mm is recommended.

The self-resonant frequency (SRF) of the 1239AS-H-4R7M inductor is approximately 150MHz. This is not explicitly stated in the datasheet, but it can be estimated based on the inductor's physical characteristics and materials.

While the 1239AS-H-4R7M inductor is suitable for high-frequency applications, its performance may degrade above 100MHz due to its self-resonant frequency. For frequencies above 100MHz, it's recommended to consider alternative inductors with a higher SRF or to use impedance matching techniques to optimize performance.

To ensure the reliability of the 1239AS-H-4R7M inductor in a high-reliability application, it's essential to follow proper storage, handling, and assembly procedures. Additionally, consider using a conformal coating to protect the inductor from environmental factors, and ensure that the operating conditions are within the specified ratings.