CRT0603-BY-1003ELF is a thin-film precision chip resistor from Bourns designed for high-accuracy current sensing and precision circuit applications. The device features ultra-tight tolerance of ±0.25%, a temperature coefficient of resistance of ±25 PPM/°C, and operates across a wide temperature range from -55°C to +155°C. It is rated for 1/10 watt power at 70°C with a maximum working voltage of 75 V and maximum overload voltage of 150 V, supporting resistance values from 49.9 O to 511 kO depending on tolerance grade. The resistor is RoHS compliant with tin-plated termination and is commonly used in medical equipment, printers, automation systems, and navigation equipment where precision and reliability are critical.