Microchip’s RTG4 FPGAs Earn QML Class V Qualification for Space Missions

Microchip’s announcement covers its radiation-tolerant RTG4 FPGA family with lead-free flip-chip bumps. On October 17, 2024, Microchip said these devices achieved Qualified Manufacturers List (QML) Class V status, the highest space-component qualification level designated by the U.S. Defense Logistics Agency (DLA). The qualification applies to specified ceramic-package variants—not every Microchip FPGA or every RTG4 orderable configuration.

For a flight program, QML Class V is an important mission-assurance credential, but engineers must still match the exact part number, package, radiation environment, operating conditions and qualification records to the mission.

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What QML Class V means for space missions

Microchip describes QML Class V as the highest qualification level for space components and says it is relevant to mission assurance for human-rated, deep-space and national-security programs. The designation indicates that a device and its manufacturing process have passed the applicable high-reliability controls and testing required for that qualification level.

It is not a universal suitability certificate. A spacecraft team still has to review the applicable military drawing or qualification record, lot acceptance data, radiation analysis, package construction, environmental limits, derating rules and configuration-management requirements.

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Microchip’s October 17, 2024 announcement is available at Microchip’s RTG4 QML Class V announcement.

Which RTG4 packages are covered?

Microchip’s current RTG4 product page lists QML Class V qualification for these ceramic package families:

The 2024 milestone specifically concerns RTG4 devices using lead-free flip-chip bumps. Before specifying a component, verify the exact orderable part, package suffix, drawing revision and associated QML documentation on the RTG4 product page and through Microchip or its authorized channel.

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How the RTG4 qualification milestones fit together

Several announcements describe different RTG4 package or process milestones. They should not be treated as one qualification event:

• 2018: Microsemi, later acquired by Microchip, announced QML Class V qualification for RTG4 and highlighted Class 1 space-flight systems. See the 2018 announcement.
• 2020: Microchip announced QML Class V qualification in the ceramic quad-flat-pack (CQFP) option. See the 2020 CQFP announcement.
• 2024: The announcement relevant to this headline covers lead-free flip-chip-bump RTG4 FPGAs.

RTG4 capabilities relevant to spacecraft designers

Microchip describes RTG4 as a fourth-generation Flash-based FPGA family with high-speed interfaces, including SerDes. The following figures are manufacturer-published specifications, not independent test results:

Those values come from Microchip’s current RTG4 specifications. They do not eliminate the need for system-level shielding, power-distribution analysis, fault management or mission-specific radiation testing.

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What the lead-free bump data adds

In a February 6, 2026 technical blog, Microchip reported reliability testing of lead-free bump connections through up to 2,000 thermal cycles between −65°C and 150°C. The company also says QML Class V devices receive more extensive burn-in, temperature cycling and life testing than QML Class Q devices. These are Microchip’s published test details; they are not a substitute for reviewing the complete device-specific qualification report and assembly guidance.

Read the company’s explanation at RTG4 QML-V to RT Mil-Plastic.

Flight heritage claims and how to use them

Microchip says RTG4 has flight heritage on Mission Extension Vehicles 1 and 2, CAS-500 and Artemis II, and is baselined in many U.S. and international programs. These are company statements; the public claim does not by itself establish the FPGA’s exact role, variant or operating conditions on each spacecraft.

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Microchip’s February 2026 blog also describes more than 60 years of company space-flight heritage. That is a company-level figure, not 60 years of RTG4 operation.

Engineering checklist before selecting an RTG4 device

1. Identify the exact device and package. Record the full orderable number, ceramic package, bump option and applicable drawing.
2. Confirm the qualification record. Check that the selected configuration—not merely the RTG4 family—is listed at QML Class V.
3. Build the radiation case. Compare the mission’s total-ionizing-dose, displacement-damage and single-event-effects environments with the data for the exact device and conditions.
4. Review assembly constraints. Lead-free flip-chip construction, ceramic package handling, board materials, rework rules and inspection requirements can affect manufacturing flow and schedule.
5. Check interfaces and performance. Validate the required register capacity, SerDes lane count and data rate, power, timing and thermal margins.
6. Document mission assurance. Include procurement controls, lot screening, traceability, derating, redundancy and fault-response requirements in the program plan.

QML Class V versus QML Class Q

Microchip states that QML Class V devices undergo more extensive burn-in, temperature cycling and life testing than QML Class Q devices. The higher class can support programs with stringent assurance requirements, but it may also affect availability, documentation, screening flow and cost. The right choice depends on the customer’s contract, mission criticality, schedule and approved parts policy; QML V is not automatically the best fit for every spacecraft.

What this announcement does—and does not—establish

• Established: Microchip announced QML Class V status for RTG4 FPGAs with lead-free flip-chip bumps in October 2024.
• Established: The product page identifies the CG(G)A/LG(G)A 1657 and CQ(G)FP 352 ceramic package families as QML Class V qualified.
• Not established: That every RTG4 package, part number or Microchip FPGA family carries the same qualification.
• Not established: That qualification alone guarantees performance in a particular orbit, launch environment or spacecraft design.
• Not independently verified here: The device-level role of RTG4 in each spacecraft named in Microchip’s flight-heritage claims.

Bottom line for procurement and design teams

Microchip’s 2024 announcement is a meaningful qualification milestone for the RTG4 radiation-tolerant FPGA family, specifically its lead-free flip-chip-bump implementations. QML Class V can simplify mission-assurance justification for demanding space programs, but only when the exact package and configuration are covered. Treat the designation as one element of a documented parts, radiation, assembly and reliability review—not as a blanket approval for any RTG4-based design.

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Frequently Asked Questions

Does QML Class V apply to every Microchip FPGA?

No. The announcement concerns RTG4 devices with lead-free flip-chip bumps, and Microchip lists specific ceramic package families. Other RTG4 configurations and other FPGA families require separate verification.

Is QML Class V a guarantee that an RTG4 FPGA will work on my mission?

No. It is a high-level component qualification. Mission teams must still verify radiation conditions, package, operating limits, assembly controls and the applicable qualification records.

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