Electronic devices and components not controlled by 3A001 — ECCN 3A991
Controls processors, memories, converters, programmable logic and vacuum electronic devices that exceed named speed, resolution and interface thresholds.
The entry, quoted as it reads today
a. “Microprocessor microcircuits”, “microcomputer microcircuits”, and microcontroller microcircuits having any of the following: a.1. A performance speed of 5 GFLOPS or more and an arithmetic logic unit with an access width of 32 bit or more; a.2. A clock frequency rate exceeding 25 MHz; or a.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: b.1. Electrical erasable programmable read-only memories (EEPROMs) with a storage capacity; b.1.a. Exceeding 16 Mbits per package for flash memory types; or b.1.b. Exceeding either of the following limits for all other EEPROM types: b.1.b.1. Exceeding 1 Mbit per package; or b.1.b.2. Exceeding 256 kbit per package and a maximum access time of less than 80 ns; b.2. Static random access memories (SRAMs) with a storage capacity: b.2.a. Exceeding 1 Mbit per package; or b.2.b. Exceeding 256 kbit per package and a maximum access time of less than 25 ns; c. Analog-to-digital converters having any of the following: c.1. A resolution of 8 bit or more, but less than 12 bit, with an output rate greater than 200 million words per second; c.2. A resolution of 12 bit with an output rate greater than 105 million words per second; c.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 c.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: f.1. More than 144 terminals; or f.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: g.1. Coupled cavity devices, or derivatives thereof; g.2. Helix devices based on helix, folded waveguide, or serpentine waveguide circuits, or derivat
Corpus last verified 2026-08-29. Skenai never shows unquoted regulation.
In plain language
3A991 sits below 3A001 and catches electronic devices by measured parameters. Paragraph a covers processor and microcontroller microcircuits at 5 GFLOPS or more with a 32 bit arithmetic logic unit. It also catches a clock rate exceeding 25 MHz, or listed parallel interconnect bandwidth.
Paragraph b covers storage integrated circuits by capacity and access time. Flash EEPROM above 16 Mbit per package and SRAM above 1 Mbit per package are reached. Paragraph c pairs converter resolution with output rate, so a 12 bit converter is reached above 105,000,000 words per second.
Later paragraphs continue the same pattern in other device families. Field programmable logic devices are counted by single-ended digital inputs and outputs between 200 and 700. FFT processors are counted by execution time for a 1,024 point complex transform.
The questions this entry turns on
- 01Does the microprocessor reach 5 GFLOPS with a 32 bit ALU, or exceed a 25 MHz clock frequency?
- 02Does the analogue-to-digital converter exceed the output rate stated for its resolution band?
- 03Does the field programmable logic device have between 200 and 700 single-ended digital inputs and outputs?
- 04Does the FFT processor complete a 1,024 point complex transform in less than 1 ms?
- 05Does the memory exceed the stated per-package capacity, or the capacity and access time pair?
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What typically falls in, and what typically falls out
Typically in
- A software-defined radio board with a 14 bit converter sampling at 125,000,000 words per second, typically reading onto 3A991.c.4
- A mid-size FPGA with roughly 400 single-ended input and output pins, typically caught by 3A991.d
- A flight computer built on an application processor clocked well above 25 MHz, typically caught by 3A991.a.2
Typically out
- An 8 bit microcontroller clocked at 16 MHz on a sensor board
- A small CPLD with about 60 single-ended inputs and outputs, below the stated range
- A 12 bit converter sampling at 1,000,000 words per second in a data logger
These are typical cases, not determinations. Which side a specific product lands on turns on the answers in the Interview.
Adjacent entries
- Information security systems and equipment — ECCN 5A00215 CFR 774, Supplement No. 1, ECCN 5A002
- Other navigation, avionics and airborne communication equipment — ECCN 7A99415 CFR 774, Supplement No. 1, ECCN 7A994
- EAR99 designation for items subject to the EAR — 15 CFR 734.3(c)15 CFR 734.3(c)
Does your product land on this entry?
The Interview asks 5 to 9 questions, only the ones this entry turns on, and names the Determination free. The Dossier is the dated, cited record of how it was reached.
Free, no account. Dossier $249 if you want the record.