RTAX4000D-CQ352E - 4M Gate Rad-Tolerant FPGA CQFP-352 | Microchip
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Drop-in alternatives for RTAX4000D-CQ352E — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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RTAX4000D-CQ352V
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View Datasheet →RTAX4000DL-CQ352E
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View Datasheet →RTAX4000DL-1CQ352E
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View Datasheet →RTAX4000SL-1CQ352E
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View Datasheet →RTAX4000SL-CQ352EV
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View Datasheet →RTAX4000D-1CQ352E
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View Datasheet →RTAX4000D-CQ352E Maximum Ratings & Electrical Characteristics
| Family | RTAX-DSP Radiation-Tolerant FPGA |
| System Gates | 4,000,000 |
| Logic Cells | 33,600 |
| Process Technology | 0.15 um CMOS |
| Core Supply Voltage | 1.5 V |
| Package | 352-Pin CQFP (CQ352) ceramic, hermetic |
| Configuration | Live at power-up (antifuse, single-chip) |
| Embedded Memory | Embedded SRAM with built-in FIFO control logic |
| Clocking | Segmentable clocks, chip-wide highway routing |
| Speed Grade | Standard (no dash-1 speed suffix indicated in CQ352E ordering code) |
| Radiation Tolerance | Radiation-tolerant, space-flight qualified family (per Microchip RTAX-DSP product page) |
| Mounting Type | Surface Mount |
| Design Software | Microsemi/Microchip Libero SoC |
RTAX4000D-CQ352E 352-pin cqfp (cq352) ceramic, hermetic Pin Configuration Guide
Complete pinout information for RTAX4000D-CQ352E (352-pin cqfp (cq352) ceramic, hermetic package). This digital IC includes GPIO, communication interfaces (UART, SPI, I2C), and power pins. Refer to the manufacturer datasheet for alternate pin functions and configuration options. Essential for embedded system design and PCB layout.
No detailed pinout data available for RTAX4000D-CQ352E.
Refer to the datasheet for full pin configuration.
Safe Operating Area (SOA) & Thermal Characteristics
No official SOA curve available for this digital IC. Always operate within absolute maximum ratings specified in the datasheet. Ensure adequate cooling and derate as needed.
Typical Applications
RTAX4000D-CQ352E is suitable for 6 applications: Satellite Payload Data Processing, Spacecraft Bus Avionics, On-Board Software-Defined Radio, Instrumentation and Sensor Interface Boards, Radiation-Exposed Industrial and Test Systems, Launch Vehicle and Avionics Proto-typing.
Satellite Payload Data Processing
The RTAX4000D-CQ352E fits satellite payload processing because its 4M system gates, 33,600 cells, and RTAX-DSP multiply-accumulate blocks provide the compute density needed for on-board image compression, FFT processing, and sensor data reduction while meeting radiation-tolerance requirements. The device runs live-at-power-up from its antifuse fabric, eliminating external configuration memory - a reliability advantage at orbit insertion when configuration upsets are most likely. Designers typically connect high-speed sensor interfaces directly to the FPGA I/O, implement signal chains in the DSP blocks, and use embedded SRAM FIFOs for buffering between processing stages, all within the hermetic 352-pin CQFP package suitable for flight boards.
Recommended
Spacecraft Bus Avionics
For spacecraft command and data handling avionics, the RTAX4000D-CQ352E provides glue logic, bus interfaces, and telemetry/telecommand framing in a single live-at-power-up chip. Microchip emphasizes low power consumption and true single-chip form factor as key RTAX-DSP advantages for space designs: the 1.5V core reduces logic power on power-constrained buses, and the absence of a boot flash removes a common single-point failure. The segmentable clock network lets one FPGA serve multiple clock domains (processor bus, redundant MIL-STD-style interfaces, and housekeeping channels), while chip-wide highway routing simplifies timing closure for large interface multiplexing across the 352-pin CQFP pin ring.
Recommended
On-Board Software-Defined Radio
The DSP multiply-accumulate resources of the RTAX4000D make it suitable for spaceborne software-defined radio front-ends: digital down-conversion, filtering, and symbol processing can be implemented in the DSP fabric, with the 4M-gate capacity accommodating multiple concurrent channels. Embedded SRAM blocks with built-in FIFO control support sample buffering between the ADC interface and processing stages. Because the fabric is based on the proven Axcelerator architecture in 0.15um CMOS at 1.5V, designers gain deterministic timing for fixed-rate radio pipelines without the configuration-upset concerns of SRAM-based space FPGAs. The hermetic CQFP package supports the thermal and vacuum environment of transceiver boards on LEO and GEO platforms.
Recommended
Instrumentation and Sensor Interface Boards
Scientific instruments on space missions use the RTAX4000D-CQ352E as a sensor front-end controller: it implements ADC/DAC timing, calibration math, and packetization in one radiation-tolerant device. The 33,600-cell fabric handles high-channel-count detector arrays, while the embedded SRAM/FIFO resources queue science data toward mass storage. Live-at-power-up operation means the instrument is functional immediately after switching events without a configuration controller, which matters for instruments that power-cycle during cruise. The 352-pin CQFP provides enough I/O perimeter for parallel detector interfaces, and Microchip's Libero SoC flow supports the rigorous simulation and sign-off required for flight instrument qualification.
Recommended
Radiation-Exposed Industrial and Test Systems
Beyond orbit, the RTAX4000D-CQ352E serves high-radiation terrestrial environments such as particle accelerator instrumentation, nuclear plant monitoring, and space-heritage test equipment. The 0.15um antifuse fabric is inherently immune to configuration upsets that plague SRAM FPGAs, making it a lower-risk choice where reconfiguration is impossible mid-experiment. Its 4M gates allow replication of commercial FPGA reference designs into a rad-tolerant device, and the ceramic CQFP can be socketed or conformally mounted in test racks. For such systems, the same footprint family (CQ352) enables a common carrier board across RTAX4000D, DL, and SL variants to cover density, speed, and power trade-offs.
Recommended
Launch Vehicle and Avionics Proto-typing
The RTAX4000D-CQ352E is well suited to launch-vehicle avionics where flight heritage and deterministic configuration matter more than reprogrammability. Antifuse one-time programming protects the bitstream against single-event upsets during ascent through radiation belts, and the 4M-gate capacity accommodates flight control interfaces, redundant voting logic, and telemetry formatting in a single device. Development teams commonly prototype logic on lower-cost RTAX proto units (for example the RTAX2000SL-1CQ352PROTO class parts) before committing flight CQFP silicon, since the Libero SoC project maps directly across the family. The hermetic package supports the vibration and thermal profile of booster electronics bays.
Recommended
Recommended Products Summary
Engineering reference data for RTAX4000D-CQ352E — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | RTAX4000D-CQ352V | RTAX4000DL-CQ352E | RTAX4000SL-1CQ352E | RTAX4000D-1CQ352E |
|---|---|---|---|---|---|
| Package | 352-Pin CQFP (CQ352) | 352-Pin CQFP - same | 352-Pin CQFP - same | 352-Pin CQFP - same | 352-Pin CQFP - same |
| Brand | Microsemi (Microchip) | Microsemi | Microsemi | Microsemi | Microchip Technology |
| Family | RTAX-DSP | RTAX-DSP | RTAX-DSP (DL low-power) | RTAX-SL (no DSP) | RTAX-DSP |
| System Gates | 4,000,000 | 4,000,000 | 4,000,000 | 4,000,000 | 4,000,000 |
| Logic Cells | 33,600 | 33,600 | 33,600 | 33,600 | 33,600 |
| DSP Blocks | Yes (D suffix) | Yes | Yes | No | Yes |
| Speed Grade | Standard | Standard | Standard (DL) | -1 (faster) | -1 (faster) |
| Core Voltage | 1.5 V | 1.5 V (V voltage option) | 1.5 V | 1.5 V | 1.5 V |
| Configuration | Antifuse, live-at-power-up | Antifuse | Antifuse | Antifuse | Antifuse |
Key Differentiators
- Dedicated DSP multiply-accumulate blocks (vs RTAX4000SL-1CQ352E)
- Faster standard speed grade available in family (vs RTAX4000D-1CQ352E)
- Lower power option on same footprint (vs RTAX4000DL-CQ352E)
Design Notes
Estimated: power budgeting for the RTAX4000D-CQ352E must account for the 1.5V core plus I/O bank supplies; a 33,600-cell fabric with high toggle rates can draw hundreds of milliwatts on the core alone. Use the power calculation features in Microchip Libero SoC with your actual utilization and toggle rates, then derate for worst-case radiation and temperature. Follow the datasheet power-sequencing and decoupling guidance; place bulk and 0.1uF decoupling capacitors at each supply pin pair of the CQ352.
The RTAX4000D is one-time programmable antifuse silicon - there is no reconfiguration after programming, so any logic bug after programming flight units means scrapping the device. Complete full simulation, timing closure in Libero SoC, and a formal design review before submitting programming files. Also verify package mechanicals: Microchip's support knowledge base documents that 1272-pin CCGA/LGA body sizes differ between RTAX4000D/DL and RTAX4000S/SL devices, so footprint heritage from the S/SL family must not be blindly reused.
With 352 perimeter pins on a ceramic CQFP, manage I/O switching noise by grouping fast-switching banks away from sensitive analog or clock pins, and assign series termination per the RTAX-S/SL/DSP datasheet AC characteristics. Use the segmentable clock resources to keep high-fanout clocks on dedicated routing rather than general fabric. For flight boards, follow the manufacturer's rad-hard design application guidance including SEU mitigation (TMR) on state machines, even though the antifuse configuration itself is upset-immune.
Estimated: the ceramic CQFP-352 conducts most heat through its leads and ceramic body; junction temperature should be verified with theta_JA or theta_JB data from the manufacturer datasheet against your mission thermal environment (vacuum limits convection, so board conduction paths matter). Keep worst-case power below the junction limit at maximum case temperature with margin, and bond the package body to a thermal plane where the mechanical design allows.
Compliance Information
Space-flight hermetic ceramic CQFP component; compliance declarations must be obtained from Microchip for the exact ordering code. AEC-Q100 automotive qualification is not applicable to this space-grade product family.
