Items Covered
- a."Microprocessor microcircuits", "microcomputer microcircuits", and microcontroller microcircuits having any of the following:
- 1. A performance speed of 5 GFLOPS or more and an arithmetic logic unit with an access width of 32 bit or more;
- 2. A clock frequency rate exceeding 25 MHz; or
- 3. More than one data or instruction bus or serial communication port that provides a direct external interconnection between parallel "microprocessor microcircuits" with a transfer rate of 2.5 Mbyte/s;
- b.Storage integrated circuits, as follows:
- 1. Electrical erasable programmable read-only memories (EEPROMs) with a storage capacity;
- 1.a. Exceeding 16 Mbits per package for flash memory types; or
- 1.b. Exceeding either of the following limits for all other EEPROM types:
- 1.b.1. Exceeding 1 Mbit per package; or
- 1.b.2. Exceeding 256 kbit per package and a maximum access time of less than 80 ns;
- 2. Static random access memories (SRAMs) with a storage capacity:
- 2.a. Exceeding 1 Mbit per package; or
- 2.b. Exceeding 256 kbit per package and a maximum access time of less than 25 ns;
- 1. Electrical erasable programmable read-only memories (EEPROMs) with a storage capacity;
- c.Analog-to-digital converters having any of the following:
- 1. A resolution of 8 bit or more, but less than 12 bit, with an output rate greater than 200 million words per second;
- 2. A resolution of 12 bit with an output rate greater than 105 million words per second;
- 3. A resolution of more than 12 bit but equal to or less than 14 bit with an output rate greater than 10 million words per second; or
- 4. A resolution of more than 14 bit with an output rate greater than 2.5 million words per second;
- d.Field programmable logic devices having a maximum number of single-ended digital input/outputs between 200 and 700;
- e.Fast Fourier Transform (FFT) processors having a rated execution time for a 1,024 point complex FFT of less than 1 ms;
- f.Custom integrated circuits for which either the function is unknown, or the control status of the equipment in which the integrated circuits will be used is unknown to the manufacturer, having any of the following:
- 1. More than 144 terminals; or
- 2. A typical "basic propagation delay time" of less than 0.4 ns;
- g.Traveling-wave "vacuum electronic devices," pulsed or continuous wave, as follows:
- 1. Coupled cavity devices, or derivatives thereof;
- 2. Helix devices based on helix, folded waveguide, or serpentine waveguide circuits, or derivatives thereof, with any of the following:
- 2.a. An "instantaneous bandwidth" of half an octave or more; and
- 2.b. The product of the rated average output power (expressed in kW) and the maximum operating frequency (expressed in GHz) of more than 0.2;
- 2.c. An "instantaneous bandwidth" of less than half an octave; and
- 2.d. The product of the rated average output power (expressed in kW) and the maximum operating frequency (expressed in GHz) of more than 0.4;
- h.Flexible waveguides designed for use at frequencies exceeding 40 GHz;
- i.Surface acoustic wave and surface skimming (shallow bulk) acoustic wave devices (i.e., "signal processing" devices employing elastic waves in materials), having either of the following:
- 1. A carrier frequency exceeding 1 GHz; or
- 2. A carrier frequency of 1 GHz or less; and
- 2.a. A frequency side-lobe rejection exceeding 55 Db;
- 2.b. A product of the maximum delay time and bandwidth (time in microseconds and bandwidth in MHz) of more than 100; or
- 2.c. A dispersive delay of more than 10 microseconds;
- j.Cells as follows:
- 1. Primary cells having an energy density of 550 Wh/kg or less at 293 K (20 °C);
- 2. Secondary cells having an energy density of 350 Wh/kg or less at 293 K (20 °C);
- k."Superconductive" electromagnets or solenoids "specially designed" to be fully charged or discharged in less than one minute, having all of the following:
- 1. Maximum energy delivered during the discharge divided by the duration of the discharge of more than 500 kJ per minute;
- 2. Inner diameter of the current carrying windings of more than 250 mm; and
- 3. Rated for a magnetic induction of more than 8T or "overall current density" in the winding of more than 300 A/mm2;
- l.Circuits or systems for electromagnetic energy storage, containing "components" manufactured from "superconductive" materials "specially designed" for operation at temperatures below the "critical temperature" of at least one of their "superconductive" constituents, having all of the following:
- 1. Resonant operating frequencies exceeding 1 MHz;
- 2. A stored energy density of 1 MJ/M3 or more; and
- 3. A discharge time of less than 1 ms;
- m.Hydrogen/hydrogen-isotope thyratrons of ceramic-metal construction and rate for a peak current of 500 A or more;
- n.Digital integrated circuits based on any compound semiconductor having an equivalent gate count of more than 300 (2 input gates);
- o.Solar cells, cell-interconnect-coverglass (CIC) assemblies, solar panels, and solar arrays, which are "space qualified" and not controlled by 3A001.e.4;
- p.Integrated circuits, n.e.s., having any of the following:
- 1. A processing performance of 8 TOPS or more; or
- 2. An aggregate bidirectional transfer rate over all inputs and outputs of 150 Gbyte/s or more to or from integrated circuits other than volatile memories.
- a.For purposes of 3A991.p, 'MacTOPS' is the theoretical peak number of Tera (10^12) operations per second for multiply-accumulate computation (D = A × B + C).
- b.The 2 in the formula is based on industry convention of counting one multiply-accumulate computation, D = A × B + C, as 2 operations for purpose of datasheets. Therefore, 2 × 'MacTOPS' may correspond to the reported TOPS or FLOPS on a datasheet.
Control Reasons Explained
This ECCN is controlled for the following reasons. Each reason maps to a column on the Commerce Country Chart, which determines whether a license is required for a given destination.
- ATAnti-Terrorism
- Basic anti-terrorism controls that apply to most items on the CCL. A license is required for exports to countries designated as state sponsors of terrorism.
Common Questions About 3A991
What does ECCN 3A991 cover?
ECCN 3A991 is an entry on the Commerce Control List (Electronics). The List of Items Controlled below describes the products, software, or technology captured by this classification. Compare your item against those parameters when self-classifying.
How do license requirements work for this ECCN?
License need depends on the control reasons shown for this code (for example NS, RS, MT, AT), the destination country, and how your transaction maps against the Commerce Country Chart, de minimis, and other EAR provisions. This page is a research aid only. Confirm against the current rule text and your specific facts before exporting.
Where is the official text for this ECCN?
The legal text appears in Supplement No. 1 to part 774 of the Export Administration Regulations (15 CFR Part 774). Use the official BIS link on this page to open the current supplement entry for this ECCN.
What if my product matches more than one ECCN?
When several ECCNs appear to fit, the controlling entry is usually the one that is most specific to your item's form, function, or technical limits. Cross-references in the List of Items Controlled and related ECCNs listed on this page are common starting points for narrowing the choice.
How often should I re-check this classification?
The Commerce Control List changes when BIS publishes new or amended rules. Revisit the official entry when regulations update, when the product's technical parameters change, or when the destination, end-user, or end-use of a transaction changes.
What do the control reason codes mean?
Each control reason (NS, RS, MT, AT, etc.) maps to a column on the Commerce Country Chart in Supplement No. 1 to part 738 of the EAR. When a control reason applies to your ECCN and the destination country has an X in that column, a license is generally required unless an exception applies. See the Control Reasons Explained section on this page for details on each code.