Based on this product's specifications, here are some alternatives and similar models
Power adapter GIGABYTE 280W 20V – original laptop power supply
Summary description:
Original GIGABYTE power adapter delivering 280W output at 20V for compatible portable devices and laptops. Designed as an OEM replacement, it provides stable power delivery for charging and operation of high-performance notebooks and mobile workstations. Suitable for use at home, office, or on the road where the specified voltage and power match device requirements.