1. Qualification & Grade: The B220AQ-13-F is designated as “Automotive” Grade and is “AEC-Q101” Qualified, indicating it has passed the reliability standard tests defined by the Automotive Electronics Council (e.g., more stringent temperature cycling, humidity bias, etc.). The B220A-13-F carries no such marking and is a standard industrial/commercial-grade component. The B220AQ-13-F is suitable for automotive electronics and other fields demanding high long-term reliability and environmental endurance. The B220A-13-F is intended for consumer electronics, general industrial equipment, and similar applications. 2. Junction Capacitance Test Condition: The junction capacitance (200 pF) of the B220AQ-13-F is measured at 40 V, whereas that of the B220A-13-F is measured at 4 V. The junction capacitance (Cj) of a Schottky diode decreases as the reverse bias voltage (Vr) increases. A capacitance measurement taken at a higher voltage (closer to the rated voltage) better reflects the high‑frequency switching performance under typical operating conditions. The data for the B220AQ-13-F is more representative of actual high‑voltage applications (e.g., freewheeling diodes in switching power supplies), providing a more rigorous characterization of its dynamic behavior. The B220A-13-F is tested under the standard low‑voltage condition; its actual capacitance in high‑voltage applications may be slightly lower than the nominal value. Summary: The core differences lie in the reliability qualification grade and the rigor of parameter testing. The former determines the applicable field, while the latter may lead to subtle performance variations in high‑frequency, high‑voltage applications—though this is often negligible in most ordinary circuits. The choice ultimately depends on the environmental and reliability requirements of the end application.