CRT0805-BX-4021ELF is a thin-film precision chip resistor from Bourns designed for current sensing, precision circuits, and demanding applications including medical equipment, printers, and automation systems. The device features ultra-tight tolerance with a power rating of 1/8 watt at 70°C and a maximum working voltage of 150 V, supporting a maximum overload voltage of 300 V. It offers a temperature coefficient of resistance (TCR) ranging from 2 to 50 PPM/°C depending on the selected value, with resistance values available from 24.9 O to 1 MO across various tolerance grades. The resistor is RoHS compliant with tin-plated termination (LF), operates over a temperature range of -55°C to +155°C, and is ideal for applications requiring high precision and stability in compact form factors.