The TPS7H1111-SP HDR exposure was performed
on biased and unbiased devices in a Co-60 gamma cell at Texas Instruments in Dallas,
Texas. The dose rate for exposure was between 50-300 rad(Si)/s. After exposure up to the
target dose rate, the devices were electrically tested at Texas Instruments. ATE test
limits are set per SMD electrical limits based on qualification and characterization
data. As shown in
Table 1-1 the 100krad(Si) biased and unbiased devices were annealed with the respective biased
and unbiased conditions for one week. The effective dose rate for these devices was 165
mrad(Si)/s.
The TPS7H1111-SP LDR exposure was performed on biased and unbiased devices in a Co-60 gammacell under a 10-mrad(Si)/s exposure rate. The dose rate of the irradiator used in the exposure ranges from < 10 mrad(Si)/s to a maximum of approximately 84 rad(Si)/s, determined by the distance from the source. For the LDR (10 mrad(Si)/s) exposure, the test box was positioned approximately 2 m from the source. The exposure boards are housed in a lead-aluminum box (as specified in MIL-STD-883 TM 1019.9) to harden the gamma spectrum and minimize dose enhancement effects. The irradiator calibration is maintained by Logmire Laboratories using Thermoluminescence Dosimeters (TLDs) traceable to the National Institute of Standards and Technology (NIST) and the dosimetry was verified using TLDs prior to the radiation exposures. After exposure, devices were electrically tested at Texas Instruments. ATE test limits are set per SMD electrical limits based on qualification and characterization data.