SNOAA62A February   2023  – February 2023 LMP7704-SP

 

  1.   Abstract
  2.   Trademarks
  3. 1Overview
  4. 2SEE Mechanisms
  5. 3Test Device and Test Board Information
  6. 4Irradiation Facility and Setup
  7. 5SEL Results
  8. 6SET Results
  9. 7Summary
  10.   A Confidence Interval Calculations
  11.   B References
  12.   C Revision History

5 SEL Results

During SEL characterization, the device was heated using forced hot air, maintaining the IC temperature at 125°C. The temperature was monitored by means of a K-type thermocouple attached as close to the IC as possible. The species used for the SEL testing was a Praseodymium (59Pr) ion with an angle-of-incidence of 39° for an LETEFF = 85 MeV-cm2/mg. The kinetic energy in the vacuum for this ion is 2.114 GeV (15-MeV/amu line). A flux of approximately 105 ions/s-cm2 and a fluence of approximately 107 ions/cm2 were used for two runs. The VS supply voltage is supplied externally onboard at the recommended maximum voltage setting of 12 V. Run duration to achieve this fluence was approximately 2 minutes. No SEL events were observed during both runs shown in Table 5-1. #T5559186-1 shows a plot of the current vs time.

Table 5-1 LMP7704-SP SEL Conditions Using 59Pr at an Angle-of-Incidence of 39°
RUN #DISTANCE
(mm)		TEMPERATURE
(°C)		IONANGLEFLUX
(ions/s-cm2)		FLUENCE
(ions/cm2)		LETEFF
(MeV-cm2/mg)
1040125

Pr

39°1.00E+051.00E+07

85

311

40

125

Pr

39°1.00E+051.00E+07

85

No SEL events were observed, indicating that the LMP7704-SP is SEL-immune at LETEFF = 85 MeV-cm2/mg and T = 125°C. Using the MFTF method described in Appendix A and combining (or summing) the fluences of the two runs at 125°C (2 × 107 ions/cm2), the upper-bound cross-section (using a 95% confidence level) is calculated in Equation 1:

Equation 1. σSEL ≤ 1.84 × 10–7 cm2 for LETEFF = 85 MeV-cm2/mg and T = 125°C
GUID-20210126-CA0I-6SCC-VLG3-VCCHPJVQGLZB-low.jpgFigure 5-1 Current vs Time (I vs t) Data for VS Current During SEL Run # 10