The Galaxy S24 Ultra users report that the S Pen emits a plastic burning odor reminiscent of previous models such as the S22 Ultra and S23 Ultra.

A user of the Galaxy S24 Ultra recently shared on Reddit that their S Pen has a strong, unpleasant smell when sniffed closely, akin to burnt plastic. This has prompted speculation about the root cause of this issue. Interestingly, individuals who have tested the S Pen of the S22 Ultra and S23 Ultra have reported a similar scent.

It is speculated by 9to5google that the reason behind this issue may stem from the coating material used on the surface of the S Pen since the S22 Ultra onwards. Notably, the S Pen of the Note 20 employs a different material.

Samsung representative AndrewL responded to inquiries on the Samsung Community, explaining that the proximity of the S Pen to the internal components of the device causes it to heat up during usage. This heat results in the plastic of the S Pen warming up and emitting a smell. As the S Pen cools down, the smell dissipates on its own. He likened this process to the scent one might encounter when a car has been parked in the sun for a while, releasing odors from the plastic and upholstery inside the vehicle.

Sources – Reddit, 9to5google, Ars Technica

TLDR: Users of the Galaxy S24 Ultra have reported a strong, unpleasant smell emanating from their S Pens, speculated to be caused by the heating of the plastic coating when in close contact with internal device components. AndrewL from Samsung explained this phenomenon, likening it to the scent released from a sun-baked car interior.