Molded tantalum, 1 µF at 10 V — the decoupling and filtering role
The TPSR105K010R9000: The 9 Ohm ESR at 100 kHz is the dominant loss term in the impedance profile — for a 1 µF part, this ESR sets the self-resonant frequency near 1.7 MHz and defines the ripple current capability. In a 10 V rail decoupling application, the 9 Ohm ESR means the capacitor dissipates I²R heat from ripple current; the 0805 body limits the total dissipation to roughly 100 mW before the surface temperature rise exceeds 20°C above ambient. The -55°C to 125°C operating range covers the full military temperature grade (MIL-PRF-55365 Class C) and industrial extended-range applications. Capacitance change over this range follows the typical tantalum characteristic: approximately +10% at -55°C and -15% at 125°C relative to the 25°C value, with the ESR roughly doubling at the cold end. The molded case provides mechanical protection and standard reflow solderability — no conformal coating or hermetic seal, so moisture sensitivity level (MSL) is typically 3 for this construction.
0805 footprint and board integration
The manufacturer size code R corresponds to this case. The termination is standard tin-plated nickel barrier for reflow soldering — the recommended land pattern per IPC-7351B is 1.40 mm pad width, 1.00 mm pad length, with a 1.00 mm gap between pads. The molded body is non-magnetic and compatible with automated optical inspection (AOI) systems.