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What does a radiation-tolerant FPGA rating actually claim?
A rating is evidence about a defined device under defined conditions. Its meaning depends on what part and configuration were tested, what radiation was used, how the device was operated, and which failure or performance endpoint was measured. A headline number without those details is incomplete.
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NASA’s Electronic Radiation Characterization Project notes that radiation hazards differ with mission orbit, timeframe, duration, and spacecraft design. The same FPGA rating can therefore be relevant to one mission and insufficient to answer another mission’s risk question. NASA Electronic Radiation Characterization Project
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TID: accumulated exposure
Total ionizing dose (TID) is accumulated ionizing radiation over time. Exposure can change device parameters, and a TID rating describes behavior against a cumulative-dose test—not the device’s response to each particle interaction. Microchip describes TID as accumulated radiation dose over a specified period. Dose rate and other test conditions matter, and the company cautions that sample-test results do not guarantee that every unit from each wafer lot will meet the observed levels. Microchip radiation effects information
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SEE: effects from individual particle interactions
Single-event effects (SEE) result from individual particle interactions. They include several different behaviors, so a TID value does not establish a device’s upset or latch-up response.
- SEU (single-event upset): a particle-induced change in stored data or device state.
- SET (single-event transient): a transient response that may propagate through logic or a signal path; its system impact depends on where and how it propagates.
- SEL (single-event latch-up): a potentially damaging state that can cause excessive current and may require intervention.
LET (linear energy transfer) is an index of energy deposited along a particle’s path, often used to characterize SEE response. An LET threshold alone does not give an event rate for a particular mission: estimating risk also requires the mission particle environment and device response data, such as a cross-section where available. JPL discusses transient effects such as SEU and potentially catastrophic effects such as SEL in its Radiation Effects Database.
What does a 100 krad TID rating mean?
It means the rating is expressed as a cumulative-dose result at the stated level; it does not mean the FPGA is immune to all radiation effects up to that number, nor does it predict an in-orbit lifetime by itself. Confirm the dose unit and conditions, the tested device and configuration, and what the test counted as an acceptable endpoint. Then compare that evidence with the expected dose for the mission and its design margins.
In particular, 100 krad TID does not answer how often the FPGA may experience SEUs or SETs, whether it is susceptible to SEL, or whether the tested result applies to every unit in a production lot. Those questions require separate SEE data and device-specific evidence.
How should you read a vendor rating or test report?
Start with the underlying report where one is available; a product-page summary may not provide enough detail for a fair comparison. JPL warns that results depend on test conditions, lot variability, application context, and mission environment. JPL Radiation Effects Database guidance
- Exact part and package: Check the device identifier, package, and configuration tested. Do not assume evidence for one package or variant automatically covers another.
- Radiation type and test method: Identify whether the result concerns TID, heavy-ion or other SEE testing, and the test method used.
- Dose conditions: For TID, record the dose and dose rate, plus temperature, bias, and operating conditions when reported.
- SEE conditions and results: Look for the effect tested, particle and LET range, fluence, observed events, and cross-section information where published. A threshold and a measured cross-section are different kinds of evidence.
- Operating mode and voltage: Note whether the device was powered, what functions were active, and the relevant supply or I/O voltages.
- Endpoint and sample limits: Find out what counted as failure or an upset, how many samples were tested, and whether the vendor says results are representative of a lot or only of tested samples.
- Qualification and screening: Treat package or manufacturing qualification as separate from radiation-effect data. Confirm the status for the exact part and package, and interpret it under the mission’s procurement and assurance requirements.
Microchip’s radiation data index links device- and effect-specific reports, including heavy-ion, proton, neutron, and TID materials. These reports can provide context not shown in a short product summary.
What do RTG4 and RT PolarFire ratings show?
The following are manufacturer-published claims, not independent endorsements or guarantees of mission performance. Their different metrics and stated conditions mean they should not be ranked by headline numbers alone.
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| Device | Manufacturer-published radiation claims | Additional context |
|---|---|---|
| Microchip RTG4 | TID > 100 krad; configuration-memory upset immunity to LET > 103 MeV·cm²/mg; SEL immunity to LET > 103 MeV·cm²/mg. | Microchip also describes SEU-hardened registers with built-in TMR, EDAC for SRAM, and SET-hardened global clocks and resets. Its page lists QML-V qualification for specified ceramic packages and JEDEC qualification for a plastic package. RTG4 product page |
| Microchip RT PolarFire SoC | 100 krad TID; SEL threshold > 75 MeV·cm²/mg with 2.5 V I/Os. | The I/O voltage is part of the SEL claim. Microchip describes the RTPF500ZT as QML Class Q qualified and specifies package qualification pathways. RT PolarFire SoC product page |
The product-page summaries do not establish that the two devices were tested under matching methods, sample sizes, operating modes, or endpoints. Use their linked reports and the exact configuration planned for the design before drawing a comparison.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Does radiation-tolerant mean radiation-proof or flight-qualified?
No. “Radiation-tolerant” is not a blanket guarantee of immunity, and a published rating is not by itself flight qualification. JPL states that inclusion of a part or dataset in its database does not constitute endorsement, certification, or qualification for flight or mission use. It also cautions that absence of data for a part or effect is not evidence of tolerance or immunity. JPL database guidance
Radiation performance evidence, manufacturing or package qualification, screening, and mission approval address different questions. A qualification label must be checked against the precise part and package, then interpreted within the program’s procurement and mission-assurance requirements.
How do you compare FPGA radiation ratings for a satellite?
Compare evidence across the same categories, then ask whether it addresses the satellite’s actual radiation environment and system design. A practical review should capture:
- Mission environment: Define orbit, mission duration, shielding and spacecraft configuration, and the resulting TID and particle environment.
- Exact candidate: Record the part, package, configuration technology, and procurement or qualification status.
- TID evidence: Compare dose level and test conditions, including dose rate and operating state where reported.
- SEE evidence: Compare which effects were tested—SEU, SET, SEL—and the LET range, cross-section, or other response data available.
- System behavior: Evaluate how the FPGA’s mitigation features and the spacecraft’s design handle upsets, transients, and fault recovery.
- Evidence fit: Check sample and lot limitations, test endpoints, package applicability, and whether the evidence supports the intended use.
- Residual risk: Identify untested effects or conditions and decide whether further analysis, testing, or design mitigation is needed.
NASA’s radiation-characterization guidance and JPL’s database are useful starting points, but component data do not replace a mission-specific radiation assessment. JPL notes that database records may be revised or expanded and that users remain responsible for due diligence and qualification for their use case. JPL Radiation Effects Database
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