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Combinational-logic soft errors are expected to be the dominant reliability issue for advanced technologies. One of the major factors affecting the soft-error rates is single-event transient (SET) pulsewidths. The SET pulsewidths, which are controlled by drift, diffusion, and parasitic bipolar-transistor parameters, are a strong function of operating temperature. In this paper, heavy-ion induced SET pulsewidths are reported at temperatures ranging from 25??C to 100??C, as measured with an autonomous SET capture circuit. Experimental and simulation results in a 90-nm bulk CMOS technology indicate an increase of as high as 37% in measured average SET pulsewidth with increasing operating temperature, with some pulses almost 2 ns long at higher temperatures. The increase in the SET pulsewidth can be explained by the dependence of parasitic bipolar-transistor characteristics on temperature.