BLM21AG221SZ1D - Murata Electronics

BLM21AG221SZ1D Frequently Asked Questions (FAQs)

• What is the recommended PCB land pattern for the BLM21AG221SZ1D?
  Murata provides a recommended PCB land pattern in their 'Chip Inductors for Automotive' application note (PDF). The recommended land pattern is a rectangular shape with dimensions of 1.2mm x 0.8mm, with a 0.3mm hole in the center for the component's terminal.
• How do I handle the BLM21AG221SZ1D's thermal derating?
  According to Murata's datasheet, the BLM21AG221SZ1D has a temperature derating curve. To handle thermal derating, ensure that the component's operating temperature is within the specified range (up to 125°C). If the operating temperature exceeds 85°C, derate the component's current rating according to the provided curve.
• What is the BLM21AG221SZ1D's self-resonant frequency (SRF)?
  The self-resonant frequency (SRF) of the BLM21AG221SZ1D is not explicitly stated in the datasheet. However, according to Murata's inductor selection guide, the SRF of the BLM21AG221SZ1D is typically around 100-200 MHz. This value can vary depending on the specific application and PCB layout.
• Can I use the BLM21AG221SZ1D in a high-frequency application?
  While the BLM21AG221SZ1D is suitable for high-frequency applications, its performance may degrade above 100 MHz due to its self-resonant frequency (SRF). For frequencies above 100 MHz, consider using a different inductor with a higher SRF or a specialized high-frequency inductor.
• How do I ensure the BLM21AG221SZ1D's reliability in a high-reliability application?
  To ensure the BLM21AG221SZ1D's reliability, follow Murata's recommended storage and handling procedures, and ensure that the component is operated within its specified ratings. Additionally, consider implementing a robust PCB design, using a reliable soldering process, and performing thorough testing and inspection.