SBOK090A January 2025 – April 2025 THVD9491-SEP
PRODUCTION DATA
5.1 SEL Results
During SEL characterization, the device was heated using forced hot air, maintaining device temperature at 125°C ± 5°C. A FLIR (FLIR ONE Pro LT) thermal camera was used to validate die temperature to make sure the device was being accurately heated. The species used for SEL testing was a Silver (109Ag) ion at an energy of 15MeV/μ with an angle-of-incidence of 0° for an LETEFF of 47.5MeV-cm2/mg. A fluence of approximately 1 × 107ions / cm2 were used for the runs.
The three devices were powered up and exposed to the heavy-ions using the maximum recommended supply voltage of 5.5V with a National Instruments PXI Chassis PXIe-4139 and a second National Instruments PXI Chassis PXIe-4139 used for the different voltage levels on the A input pin. The run duration to achieve this fluence was approximately one and a half minutes. As listed in Table 5-3, no SEL events were observed during the six runs, which indicates that the THVD9491-SEP is SEL-free. Figure 5-1, Figure 5-2 show the plot of current versus time for runs one and four, respectively. The R output pin was also monitored during SEL.
| Run Number | Unit Number | Bias | Distance (mm) | Temperature (°C) | Ion | Angle | FLUX (ions × cm2 / mg) | Fluence (Number of ions) | LETEFF (MeV × cm2 / mg) | Did an SEL event occur? |
|---|---|---|---|---|---|---|---|---|---|---|
| 1 | 1 | 1 | 40 | 124.1 | Ag | 0° | 1.00E + 05 | 1.00E + 07 | 47.5 | No |
| 2 | 1 | 2 | 40 | 124.1 | Ag | 0° | 1.00E + 05 | 1.00E + 07 | 47.5 | No |
| 3 | 2 | 1 | 40 | 123.7 | Ag | 0° | 1.00E + 05 | 1.00E + 07 | 47.5 | No |
| 4 | 2 | 2 | 40 | 123.7 | Ag | 0° | 1.00E + 05 | 1.00E + 07 | 47.5 | No |
| 5 | 3 | 1 | 40 | 123 | Ag | 0° | 1.00E + 05 | 1.00E + 07 | 47.5 | No |
| 6 | 3 | 2 | 40 | 123 | Ag | 0° | 1.00E + 05 | 1.00E + 07 | 47.5 | No |
Figure 5-1 Current versus Time for Run Number 1 of the THVD9491-SEP at T = 125°C
Figure 5-2 Current versus Time for Run Number 4 of the THVD9491-SEP at T = 125°CNo SEL events were observed, which indicates that the THVD9491-SEP is SEL-immune at LETEFF = 47.5MeV-cm2 / mg and T = 125°C. Using the MFTF method described in Section 5.2, the upper-bound cross-section (using a 95% confidence level) is calculated as: