4A101 Category 4A

Analog computers, “digital computers” or digital differential analyzers, other than those controlled by 4A001 designed or modified for use in “missiles”, having any of the following (see List of Items Controlled).

Category 4: Computers

Reasons for control

MT: Missile technology
AT: Anti-terrorism

Country chart

Control	Column
AT applies to entire entry	AT 1
MT applies to entire entry	MT 1

List-based license exceptions

Exception	As stated in the entry
GBS	N/A
LVS	N/A

Items

a. Rated for continuous operation at temperatures from below 228 K (−45 °C) to above 328 K (+55 °C); or
b. Designed as ruggedized or 'radiation hardened'.

Related controls

The act of incorporating a radiation hardened integrated circuit into a computer that is specified under ECCN 4A994 or designated as EAR99 does not, in and of itself, cause the computer to meet the parameters of ECCN paragraph 4A101.b.

Notes

Note: For the purposes of 4A101, 'radiation hardened' means that the “part,” “component” or equipment is designed or rated to withstand radiation levels which meet or exceed a total irradiation dose of 5 × 10 5 rads (Si).

Source: eCFR, version 2026-08-01, retrieved 2026-08-20T04:04:59+00:00.