During the SEL characterization, the device was heated to 125°C by using a closed-loop PID controlled heat gun (MISTRAL 6 System [120V, 2400W]). The temperature of each exposed die was constantly monitored during testing at TAMU through an IR camera integrated into the control loop to create closed-loop temperature control, while at KSEE, a standalone FLIR thermal camera was used to verify temperature prior to exposure.

The species used for SEL testing was Silver (¹⁰⁹Ag at 15MeV/nucleon and 19.5MeV/nucleon at TAMU and KSEE, respectively). For both ions, an incident angle of 0° was used to achieve an LET_EFF = 48MeV·cm²/mg (for more details refer to Section 5). The kinetic energy in the vacuum for ¹⁰⁹Ag is 1.633GeV and 2.123GeV for TAMU and KSEE, respectively. A flux of 9.54 × 10⁴ to 1.11 × 10⁵ ions/cm²/s and a fluence of approximately 10⁷ ions/cm² per run was used. Run duration to achieve this fluence was approximately two minutes. The six units were powered up and exposed to the heavy-ions using a PVIN voltage of 150V. No SEL events were observed during all nine runs, indicating that the TPS7H6101-SEP is SEL-free up to 48MeV·cm²/mg. Table 8-4 shows the SEL test conditions and results. Figure 7-1 and Figure 7-2 show plots of the current versus time for runs number 1 and number 5.

Using the MFTF method described in Single-Event Effects (SEE) Confidence Interval Calculations application report and combining (or summing) the fluences of the six runs at 125°C (6 × 10⁷), the upper-bound cross-section (using a 95% confidence level) is calculated as:

σ_SEL ≤ 6.15 × 10^-8 cm²/device for LET_EFF = 48MeV·cm²/mg and T = 125°C.