A radiation-tolerant FPGA rating is evidence about a particular device under particular test conditions—not a guarantee that it will work in every space environment. To assess a part, read its cumulative-dose (TID) and single-event-effects (SEE) data separately, check exactly what was tested, and match those results to the spacecraft’s orbit, mission life, and system design.
What does a radiation-tolerant FPGA rating mean?
It is a bounded claim about a device’s response to specified radiation exposure, measured with a stated method and endpoint. The claim may come from a manufacturer’s product page or a detailed test report; either way, its meaning depends on the exact part, configuration, operating conditions, and test setup. A number without that context is not enough to establish suitability for a mission.
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NASA’s Electronic Radiation Characterization Project notes that radiation hazards differ with mission orbit, timeframe, duration, and spacecraft design. NASA’s radiation characterization guidance therefore supports evaluating requirements mission by mission, rather than applying one universal threshold.
How do TID and SEE ratings differ?
TID: accumulated exposure
Total ionizing dose (TID) describes cumulative ionizing radiation exposure, which can change device parameters over time. A rating such as 100 krad refers to a dose level associated with a particular test and endpoint; it does not say how the FPGA responds to an individual particle strike. Dose rate and other test conditions matter, and sample testing does not necessarily guarantee that every device from a wafer lot will meet the observed result. Microchip makes this limitation explicit in its radiation-tolerant FPGA data and resources.
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SEE: effects from individual particle interactions
Single-event effects (SEE) result from individual particle interactions in a device. Their consequences vary: a single-event upset (SEU) can alter stored data or state; a single-event transient (SET) is a temporary disturbance that may propagate through logic; and a single-event latch-up (SEL) can create a potentially destructive high-current condition. A TID rating does not specify the device’s SEU, SET, or SEL response. JPL describes the distinction between transient and potentially catastrophic effects in its Radiation Effects Database guidance.
LET is not a mission event rate
Linear energy transfer (LET), commonly reported in MeV·cm²/mg, characterizes energy deposited along a particle’s path and is used in SEE testing. A threshold LET value alone does not tell you how often an event will occur in orbit. Estimating mission risk also requires the relevant particle environment and device-response information, such as cross-section data where available.
How should you read an FPGA radiation test report?
Before comparing headline figures, establish what part was tested, what exposure it received, how it was operated, and what outcome counted as a pass or failure. Look for these details in the product documentation and, where available, the underlying test report:
- Exact device and configuration: Record the part number, package, configuration technology, and any relevant device revision. Results for one part or package should not automatically be assigned to another.
- Radiation type and test method: Identify whether the evidence concerns TID or a specific SEE test, and whether the exposure used heavy ions, protons, neutrons, or another source.
- Dose conditions and endpoint: For TID, check dose level, dose rate, operating or bias state, and the parameter or failure criterion used to define the reported limit.
- SEE effects and metrics: Check which effects were monitored, the LET range or threshold, and cross-section information if published. A result about configuration-memory upset, for example, is not automatically a result about every register or logic path.
- Operating conditions: Note voltage, temperature, clocking, I/O state, and operating mode. A stated threshold may apply only under those conditions.
- Samples and lots: Look for the number and provenance of tested devices and any stated lot limitations. Sample results are evidence, not proof that every production unit behaves identically.
- Qualification and screening: Verify these separately for the exact part and package. Radiation-effect data do not by themselves establish a procurement qualification or flight approval.
JPL cautions that test response can vary with conditions, lot, application, and mission environment. Its database guidance also states that absence of data for a part or effect is not evidence of tolerance or immunity, and that inclusion of a part or dataset is not endorsement, certification, or qualification for flight. The database may be expanded or revised; users remain responsible for due diligence and for determining suitability for their use case. See the JPL Radiation Effects Database guidance.
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The following are manufacturer-published claims, not independent endorsements or guarantees of mission performance. The product pages are not necessarily equivalent test reports, so their figures should not be treated as a direct ranking.
| Device | Manufacturer-published radiation claims | Other stated details |
|---|---|---|
| Microchip RTG4 | TID > 100 krad; configuration-memory upset immunity to LET > 103 MeV·cm²/mg; SEL immunity to LET > 103 MeV·cm²/mg. | The product page describes SEU-hardened registers with built-in TMR, EDAC for SRAM, and SET-hardened global clocks and resets. It lists QML-V qualification for specified ceramic packages and JEDEC qualification for a plastic package. Consult the page and linked reports for device- and package-specific context. |
| Microchip RT PolarFire SoC (RTPF500ZT) | 100 krad TID; SEL threshold > 75 MeV·cm²/mg with 2.5 V I/Os. | The 2.5 V I/O condition is part of the SEL claim. The product page identifies the RTPF500ZT as QML Class Q qualified and describes package qualification pathways. |
See the manufacturer’s RTG4 product information and RT PolarFire SoC product information. Microchip’s radiation data index links device- and effect-specific reports, including heavy-ion, proton, neutron, and TID materials. Use those reports to check the test context instead of inferring it from a product-page summary.
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” describes performance against specified effects or exposures; it does not mean immune to all radiation or suitable for every orbit and mission duration. A tested or marketed rating also does not, by itself, qualify a part for flight. Qualification and screening information is separate from radiation-response figures and must be checked for the exact package and part within the relevant procurement and mission-assurance process.
Likewise, missing test data is not proof of poor performance—or proof of tolerance. JPL’s database guidance says its records can change and places responsibility for due diligence and use-case qualification on the user.
How do you compare FPGA radiation ratings for a satellite?
Compare evidence on separate axes, then assess it against the mission environment and the spacecraft’s mitigation strategy. A useful comparison record includes:
- Exact part number, package, and configuration technology.
- TID level, radiation source, dose rate, operating conditions, test endpoint, and sample or lot limitations.
- SEE effects tested, LET range or threshold, and cross-section data where published.
- Voltage and operating mode, including the conditions attached to any claimed threshold.
- Qualification and screening status for the exact part and package.
- Mission orbit, duration, and spacecraft design assumptions that determine the relevant radiation environment.
- System-level measures—such as error detection and correction, redundancy, reset strategy, and recovery behavior—that affect the consequences of an event.
Do not rank two devices by their largest published number if one figure describes TID and the other describes a particular SEE response. Nor should the same label or threshold be assumed to mean the same thing when tests, packages, voltages, or endpoints differ. NASA emphasizes that the hazard is mission-specific, while JPL warns that test response depends on conditions and application context; the comparison only becomes useful when those boundaries are visible.
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