RTAX4000SL-1LG1272E - 4M-Gate Rad-Tolerant FPGA | Microchip
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Drop-in alternatives for RTAX4000SL-1LG1272E — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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RTAX4000SL-LG1272E
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View Datasheet →RTAX4000SL-1LG1272E Maximum Ratings & Electrical Characteristics
| Family | RTAX-SL (Radiation-Tolerant FPGA) |
| Equivalent System Gates | 4,000,000 |
| CLB Count | 40,320 |
| Logic Cell Count | 60,480 |
| Process Technology | 0.15 um CMOS |
| Core Supply Voltage | 1.5 V |
| Maximum Combinatorial Delay | 0.99 ns per CLB |
| Package | 1272-Pin LGA |
| Mounting Type | Surface Mount |
| Programmability | One-Time Programmable (antifuse) |
| Live at Power-Up | Yes |
| Radiation Tolerance | Radiation-tolerant (space-flight grade) |
| Configuration | True single-chip, no external config PROM |
RTAX4000SL-1LG1272E 1272-pin lga Pin Configuration Guide
Complete pinout information for RTAX4000SL-1LG1272E (1272-pin lga 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 RTAX4000SL-1LG1272E.
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
RTAX4000SL-1LG1272E is suitable for 6 applications: Satellite Payload Data Processing, Spacecraft Bus Control and Command Subsystems, Instrumentation and Sensor Front-End Digital Processing, Launch Vehicle Avionics, Radiation-Tolerant Glue Logic Consolidation, Deep-Space Probe Electronics.
Satellite Payload Data Processing
The RTAX4000SL-1LG1272E fits payload data-processing chains that must withstand total ionizing dose and single-event effects without configuration loss. With 4,000,000 equivalent gates, 60,480 logic cells, and a 0.99 ns maximum CLB combinatorial delay on the 0.15 um antifuse process, it absorbs high-throughput functions such as image preprocessing, compression front-ends, and channel coding at densities beyond the RTAX2000SL. Its one-time-programmable fabric cannot suffer configuration-memory upsets, a key SEE advantage over SRAM FPGAs, and the 1.5 V core keeps static power low for power-limited spacecraft. The trade-off is lack of in-orbit reconfiguration, so all functionality must be frozen pre-launch.
Recommended
Spacecraft Bus Control and Command Subsystems
For telemetry, tracking, and command (TT&C) electronics, the RTAX4000SL-1LG1272E provides live-at-power-up (LAPU) operation, meaning the FPGA is functional the instant bus power is applied - essential during launch sequencing and power-cycled ground testing. The true single-chip form factor eliminates the external configuration PROM that adds parts, mass, and failure modes. The 1272-pin LGA supplies abundant I/O for interfacing with rad-tolerant microcontrollers, memories, and redundant bus transceivers, while the antifuse architecture ensures deterministic startup behavior. Designers should implement triple-module redundancy in RTL for sequential logic because fabric upsets, though rare, remain possible.
Recommended
Instrumentation and Sensor Front-End Digital Processing
Spaceborne scientific instruments - spectrometers, star trackers, and imaging sensors - generate high-rate digital streams that the RTAX4000SL-1LG1272E can buffer, format, and pre-reduce before downlink. Its 4M-gate fabric and 0.99 ns CLB delay support parallel datapaths and FIFO/serdes-style interfaces, while the 1.5 V core supply minimizes heat near thermally sensitive detectors. The radiation-tolerant antifuse fabric maintains timing integrity across the mission dose profile, avoiding the configuration-refresh complexity SRAM FPGAs impose in the same environment. Because the device is programmed once, instrument modes must be fixed at design time; the large capacity allows multiple operating modes to be compiled into a single fusemap.
Recommended
Launch Vehicle Avionics
Launch-vehicle flight computers and stage-control electronics face extreme vibration and short but intense radiation exposure. The RTAX4000SL-1LG1272E's land-grid-array contacts and single-chip construction support mechanically robust boards, while live-at-power-up operation guarantees the logic is active through battery-cyc avionics power sequences. The 0.15 um antifuse fabric delivers deterministic timing (0.99 ns maximum CLB combinatorial delay) needed for hard-real-time sequencing, and 60,480 logic cells consolidate sequencers, safety interlocks, and bus interfaces that would otherwise span multiple rad-hard ASSPs. Prototyping on RTAX4000SL-1LG1272PROTO hardware allows full functional verification before flight-device programming.
Recommended
Radiation-Tolerant Glue Logic Consolidation
Space programs traditionally fill boards with rad-hard SSI/MSI devices; the RTAX4000SL-1LG1272E replaces dozens of these with one 4M-gate device, cutting board area, mass, assembly cost, and interconnect failure points. The 1272-pin LGA provides the I/O breadth to interface legacy MIL-STD buses, memories, and custom ASICs, while 0.99 ns worst-case CLB delay easily covers address decoding, bus bridging, and control-sequencing functions. Live-at-power-up and single-chip configuration remove bring-up complexity in mixed-vendor systems. The one-time-programmable constraint is acceptable here because glue logic is functionally stable, making this consolidation one of the lowest-risk uses of the RTAX-SL family.
Recommended
Deep-Space Probe Electronics
Deep-space missions accumulate total ionizing dose over a decade or more and cannot be serviced, demanding components with proven radiation tolerance. The RTAX4000SL-1LG1272E's antifuse configuration is immune to configuration-memory corruption, its 1.5 V CMOS core minimizes leakage-driven power drain as devices age, and the single-chip form factor removes external configuration storage that would itself need radiation qualification. The 60,480 logic cells support autonomous fault-management logic, science-data formatting, and subsystem controllers within one device. Designers must complete all verification before launch because no reprogramming is possible; the EDIF netlist migration flow to prototyping silicon supports this discipline.
Recommended
Recommended Products Summary
Engineering reference data for RTAX4000SL-1LG1272E — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | RTAX4000SL-LG1272E | RTAX4000SL-1LG1272V | RTAX4000SL-1CG1272E | RTAX4000S-LG1272V |
|---|---|---|---|---|---|
| Package | 1272-Pin LGA | 1272-Pin LGA - same | 1272-Pin LGA - same | 1272-Pin CG ceramic package family | LGA-1272 - same footprint |
| Brand | Microchip Technology (Actel) | Microchip Technology (Actel) | Microchip Technology (Actel) | Microchip Technology (Actel) | |
| Equivalent System Gates | 4,000,000 | 4,000,000 | 4,000,000 | 4,000,000 | 4,000,000 |
| CLB Count | 40,320 | 40,320 | 40,320 | 40,320 | |
| Logic Cells | 60,480 | 60,480 | 60,480 | 60,480 | |
| Core Supply Voltage | 1.5 V | 1.5 V | 1.5 V | [DATA_NEEDED] | |
| Max Combinatorial Delay per CLB | 0.99 ns | [DATA_NEEDED] | 0.99 ns (same die) | [DATA_NEEDED] | |
| Screening Flow / Intended Use | Flight grade, 'E' flow, LG package | Flight grade, 'V' flow | Prototyping flow | 'B' qualified flow, CG package |
Key Differentiators
- One-time-programmable antifuse fabric eliminates configuration upset risk (vs RTAX4000S-LG1272V)
- Largest RTAX-SL density in the 1272-pin package (vs RTAX250SL-1LG624E)
- Live-at-power-up, single-chip configuration (vs SRAM-based space FPGAs (e.g., Xilinx Virtex-QV class))
Design Notes
The RTAX4000SL is one-time programmable (antifuse). Any functional change after programming requires a new device - there is no in-system reconfiguration or firmware update path. Complete all simulation, timing closure, and hardware verification in Microchip's Libero flow, and prototype on the footprint-compatible RTAX4000SL-1LG1272PROTO before releasing the fusemap to flight silicon. Budget extra schedule time for this verification loop; it is the single largest schedule risk in RTAX-SL programs.
With 1272 LGA contacts, power integrity dominates signal integrity. Follow the RTAX-S/SL datasheet's power-supply decoupling recommendations for the 1.5 V core and I/O banks, using multiple bulk plus high-frequency ceramic capacitors distributed across the land pattern. Series-terminate high-speed I/O to control reflections on back-terminated spacecraft harnesses, and respect the 0.99 ns worst-case CLB combinatorial delay when closing timing on long combinational paths - register heavily between functional blocks.
Even though the antifuse configuration is SEE-immune, the routing and sequential fabric are not. Apply triple-module redundancy (TMR) to state machines and control registers, use EDAC or CRC on external memories, and follow Microchip's rad-tolerant design application notes for RTAX-S/SL. Estimated: a single-event functional interrupt rate budget should be derived from your mission's orbital environment, not assumed from the datasheet alone - obtain mission-specific SEE test reports from Microchip for the RTAX4000SL.
The 1.5 V core supply on a 0.15 um process yields low static power, but dynamic power scales with clock frequency and switching activity on 60,480 logic cells. Estimated: for payload data processing above 50 MHz, perform a Libero power analysis early; supply plane resistance across a 1272-contact LGA requires a solid core power plane. Verify live-at-power-up inrush behavior against your spacecraft's current-limit protections, as antifuse FPGAs draw their full static current immediately at power application.
Compliance Information
Compliance data not stated in verified web data. Space-grade flow devices may carry exemption profiles; obtain Material Declaration Data Sheets from Microchip for program documentation.
