Learn about TID (Total Dose Effect).

TID (Total Ionizing Dose effects) teeth, for semiconductor devicesgamma rays, proton beams, electron beams etc a large amount of incident death,
generated by its ionizing action Charge accumulates in the insulating film inside the device by being "Causing deterioration of electrical characteristics" say.

Specific phenomena include increases in power supply current and leakage current, and changes in operation timing.

In addition, TID, as the word "total" suggests,
It depends on the total dose, "how much radiation was the device exposed to?"​

Therefore, the impact of TID on semiconductor devices is
It is necessary to consider based on the prediction of "how much dose will there be​ ​during the mission period?"

What devices are resistant to TID (Total Dose Effect)?

Rad-Hardand​ ​Rad-Tolerant​ ​devices with TID resistance (semiconductors for space use)​ ​
​Confirmation (testing) of TID resistance is carried out by the manufacturer.

On the other hand, for other devices (consumer parts, automotive parts),
Since most of them have not been confirmed for TID resistance,
Tolerance assessment should be performed independently if necessary.

As a TIDtolerance evaluation, there is a TID test at a radiation irradiation facility.

In this TID test, the device under evaluation is exposed to radiation fields such as gamma rays and electron beams,
Check "how the characteristics of the device change".

For products that pass these tests,
It is adopted for equipment launched into space as a device that can be expected to operate normally in space.

So far, What is TID"How much radiation were you exposed to? to rely on
TIDDevices that are resistant to"TID Those who passed the exam and were selected Do you understand what it means to be?

In the next and subsequent articles, I will introduce the "TID I will delve into and explain the countermeasures for. looking forward to.