During SEL characterization, the device was heated using forced hot air, maintaining device temperature at 125°C. A FLIR (FLIR ONE Pro LT) thermal camera was used to validate die temperature to make sure the device was accurately heated (see Figure 4-3.) The species used for SEL testing was a Silver (¹⁰⁹Ag) ion at 19.5MeV / µ with an angle-of-incidence of 0° for an LET_EFF of 47MeV-cm²/ mg. A fluence of approximately 1 × 10⁷ ions / cm² was used for each run.

The three devices were powered up and exposed to the heavy-ions using the maximum recommended supply voltage of 5.5V using a National Instruments™ PXI Chassis PXIe-4137 on VCC, input A and input B. The run duration to achieve this fluence was approximately 100 seconds. As listed in Table 5-2, no SEL events were observed during the nine runs, indicating that the SN54SC1G08-SEP is SEL-free. Figure 5-1, Figure 5-2, and Figure 5-3 show the plots of current versus time for runs one, six, and seven, respectively.

Figure 5-1 Current versus Time for Run 1 of the SN54SC1G08-SEP at T = 125°C

Figure 5-2 Current versus Time for Run 6 of the SN54SC1G08-SEP at T = 125°C

Figure 5-3 Current versus Time for Run 7 of the SN54SC1G08-SEP at T = 125°C

No SEL events were observed per specification (10μA) , indicating that the SN54SC1G08-SEP is SEL-immune at LET_EFF = 47 MeV-cm² / mg and T = 125°C. Using the MFTF method shown in Single-Event Effects (SEE) Confidence Internal Calculations , the upper-bound cross-section (using a 95% confidence level) is calculated as: