It is a surface-mount device in the B case size (1411 / 3528 Metric), designed for general-purpose filtering and decoupling in power supply rails.
ESR and ripple current — what 500 mOhm means for your rail
In a 16 V input rail feeding a 3.3 V buck converter, the capacitor's ripple current capability is tied to this ESR — lower ESR means less internal temperature rise and longer life under AC load. The ESR also shifts with temperature; expect a 1.5× to 2× increase at -55°C, which raises output ripple at cold start.