Temperature range and ESR — what they mean for the circuit
The TPSD477M006R0100: Rated for -55°C to 125°C, this capacitor operates across the full industrial and military temperature envelope. At the cold end, capacitance typically drops by about 10-15% from the 25°C value, while the ESR rises — a factor to budget for in a power supply that must start at -40°C. The 100 mOhm ESR at 100 kHz is the figure that governs ripple current handling. For a 1 A ripple at 100 kHz, the self-heating is I²R = 0.1 W, well within the part's dissipation capability in still air. Derate the ripple current above 85°C per the manufacturer's curve.