RTAX250S-LG624V - 250K-Gate Rad-Tolerant FPGA | Microchip
MPN: RTAX250S-LG624V ✓ Active| Qty | Unit Price | Extended |
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| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
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| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
RTAX250S-LG624V Overview
A radiation-tolerant FPGA is a field-programmable gate array engineered to survive and operate in the space-flight radiation environment, where high-energy particles cause single-event effects (SEE) and total ionizing dose (TID) degradation. Within the power-management hierarchy of spacecraft electronics, the RTAX-S family sits alongside radiation-hardened ASICs as the FPGA of choice for space designers, offering true single-chip operation and live-at-power-up functionality without the configuration-pumping of SRAM FPGAs.
Key features include 250K gate density with 4,224 logic cells and 248 user inputs/outputs, single-chip flip-chip packaging, and a -55C to +125C military-grade operating temperature range. The 'V' grade suffix denotes the qualified space-flow variant. The 649 MHz toggle capability and 0.15 um antifuse-based CMOS technology combine low static power with high logic throughput, making the device suitable for mission-critical signal processing and control paths.
Architecturally, the RTAX250S uses a Sea-of-Modules structure with combinable logic modules, embedded SRAM blocks, and clock-management resources, retaining its configuration in non-volatile antifuse interconnect so the device is functional immediately at power-up - a significant advantage for spacecraft that cannot afford a separate configuration device or boot sequence.
Typical applications include satellite telemetry/command subsystems, payload data processing, spacecraft bus control, and radiation-environment instrumentation where SEU resilience and single-chip integration are mandatory.
Designers should budget I/O standards and supply decoupling for the 1.5V core rail, and use the Microchip Libero SoC flow with the RTAX-S design libraries; prototyping can be done on commercial Axcelerator devices using Microchip extender boards per application note AC170.
This page synthesizes distributor data, same-family drop-in package-compatible variants, and design guidance not consolidated in the manufacturer datasheet.
Drop-in alternatives for RTAX250S-LG624V — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with RTAX250S-LG624V (same form factor and footprint) — differing in Package, Configuration, Equivalent System Gates, Radiation Tolerance, Family.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
RTAX250S-1LG624V
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
Contact for price
View Datasheet →RTAX250S-1LG624B
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2020 / Unit
View Datasheet →RTAX250SL-LG624B
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2380 / Unit
View Datasheet →RTAX250SL-CG624B
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$3950 / Unit
View Datasheet →RTAX1000S-LG624V
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$2600 / Unit
View Datasheet →RTAX2000S-1LG624V
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
Contact for price
View Datasheet →RTAX2000SL-1LG624V
✅ Drop-In ⚠️ Specs Unverified✓ In Stock
$9600 / Unit
View Datasheet →RTAX250S-LG624V Maximum Ratings & Electrical Characteristics
| Logic Cells | 4224 |
| Configurable Logic Blocks (CLBs) | 2816 |
| Equivalent Gate Count | 250000 gates |
| Maximum Toggle Frequency | 649 MHz |
| Process Technology | 0.15 um CMOS |
| Core Supply Voltage (Nominal) | 1.5 V |
| User I/O Count | 248 |
| Package | 624-Pin LGA (LG624) |
| Operating Temperature | -55C to +125C |
| Family | RTAX-S Radiation-Tolerant FPGA |
| Radiation Tolerance | Radiation-tolerant (space-grade flow, V grade) |
| Mounting Type | Surface Mount |
RTAX250S-LG624V 624-pin lga (lg624) Pin Configuration Guide
Pin configuration for RTAX250S-LG624V (624-pin lga (lg624) 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 RTAX250S-LG624V.
Refer to the datasheet for full pin configuration.
Typical Applications
RTAX250S-LG624V is suitable for 6 applications: Satellite Payload Data Processing, Spacecraft Bus Control and Telemetry/Command, Radiation-Hardened Instrumentation and Science Instruments, Launch Vehicle Avionics, Prototyping with Commercial Axcelerator Devices, Small-Sat and CubeSat Onboard Computing.
Satellite Payload Data Processing
The RTAX250S-LG624V fits payload processing chains where radiation exposure makes commercial FPGAs unusable: its antifuse configuration cannot suffer configuration upsets, and its 250K gates / 4,224 logic cells handle framing, formatting, and compression of instrument data at rates up to the 649 MHz family toggle limit. In a typical payload, the FPGA bridges sensor or receiver interfaces to downlink formatters via its 248 user I/Os, implementing standardized protocols on the single 1.5V core rail. Because it is live at power-up, payloadBring-up does not wait for configuration; the trade-off is one-time programmability, so functional changes require the design flow to be re-validated and a new flight part programmed.
Recommended
Spacecraft Bus Control and Telemetry/Command
Spacecraft bus controllers demand deterministic, immediately available logic at power-up - exactly what the RTAX250S-LG624V's antifuse, live-at-power-up architecture provides. The 4,224 logic cells and 248 I/Os accommodate MIL-STD-1553, SpaceWire, and discrete command interfaces, while the -55C to +125C range covers launch and eclipse thermal environments. Operating from a 1.5V core with low static power, the device limits bus-load power budgets compared with SRAM alternatives, and eliminates external configuration memory and scrubbing electronics, simplifying redundancy voting schemes in dual-string bus architectures.
Recommended
Radiation-Hardened Instrumentation and Science Instruments
Science instruments on exploration missions accumulate total ionizing dose and frequent single events; the RTAX250S-LG624V is qualified through Microchip's space-grade V flow for exactly this environment. Instrument sequencers, ADC interface logic, and detector front-end aggregation fit within 2816 CLBs, and the 624-pin LGA provides sufficient I/O for multi-channel detector arrays. Designers typically pair the FPGA with rad-hardened memory and power converters; the single-chip form factor reduces board area and, because there is no configuration device, removes the dominant SEE failure mode found in SRAM FPGA instruments.
Recommended
Launch Vehicle Avionics
Launch avionics experience extreme vibration, thermal swings, and brief but intense radiation belts; the RTAX250S-LG624V's ceramic-based LGA packaging and -55C to +125C rating address these conditions. Typical roles include flight-event sequencing, telemetry encoding, and safety-critical interlocks where live-at-power-up operation guarantees control logic is active from the first clock cycle. The 649 MHz capability supports high-rate timestamp counters and redundant comparison logic. One-time programmability is an advantage here: the flight configuration cannot be corrupted in flight, supporting certification arguments for single-string safety functions.
Recommended
Prototyping with Commercial Axcelerator Devices
Microchip application note AC170 defines a documented prototyping path: RTAX-S/SL designs are targeted to commercial Axcelerator (AX) devices, and Microchip extender boards map the commercial package onto the RTAX-S package footprint. Design teams use this flow to validate RTL and timing at low cost before committing flight units, since both families share the same architecture fabric. The RTAX250S-LG624V maps to the equivalent AX250 device, allowing early software and hardware bring-up. Expect small timing differences and verify final timing in Libero SoC against RTAX-S libraries before the flight build.
Recommended
Small-Sat and CubeSat Onboard Computing
Small-sat platforms increasingly fly RTAX-S devices for mission assurance within tight power budgets. The RTAX250S-LG624V's 250K-gate capacity accommodates onboard data handling, housekeeping telemetry, and simple autonomy for LEO CubeSats, while the antifuse fabric draws low static power from the 1.5V rail - valuable given solar-panel constraints. The true single-chip form factor reduces PCB area and mass, and the absence of configuration storage avoids SEU-driven reconfiguration power spikes. For constellation programs, the shared LG624 footprint across RTAX250S/1000S/2000S densities lets one carrier board scale with mission requirements.
Recommended
Recommended Products Summary
Engineering reference data for RTAX250S-LG624V — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | RTAX250S-1LG624V | RTAX250SL-LG624B | RTAX1000S-LG624V | RTAX2000S-1LG624V |
|---|---|---|---|---|---|
| Package | 624-Pin LGA (LG624) | 624-Pin LGA (LG624) - same | 624-Pin LGA (LG624) - same | 624-Pin LGA (LG624) - same | 624-Pin LGA (LG624) - same |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Logic Cells | 4224 | 4224 | 4224 | 1512 CLBs (~1M gates) | ~2M gates |
| Equivalent Gate Count | 250000 gates | 250000 gates | 250000 gates | ~1000000 gates | ~2000000 gates |
| Speed Grade | Standard | -1 (faster) | Standard (SL die) | Standard | -1 (faster) |
| Core Supply Voltage | 1.5 V nominal | 1.5 V nominal | 1.5 V nominal | 1.5 V nominal | 1.5 V nominal |
| Qualification Flow | V (space grade) | V (space grade) | B (high-rel) | V (space grade) | V (space grade) |
| Operating Temperature | -55C to +125C | -55C to +125C | -55C to +125C | -55C to +125C | -55C to +125C |
Key Differentiators
- Standard speed grade at lower cost (vs RTAX250S-1LG624V)
- Lower static power than SL alternative is reversed - SL saves power (vs RTAX250SL-LG624B)
- Optimal density point in LG624 footprint (vs RTAX2000S-1LG624V)
- One-time-programmable antifuse eliminates configuration SEE (vs SRAM-based rad-tolerant FPGAs)
Design Notes
The RTAX250S-LG624V operates from a 1.5V nominal core supply (range per Microchip family documentation starting at 1.4V). Antifuse FPGAs draw low static power, but dynamic power scales with toggle rate - at multi-hundred-MHz operation, budget decoupling with bulk capacitance near each core supply pin pair on the LG624 land pattern. Verify I/O bank supply requirements against the selected I/O standards in Libero SoC before freezing the power tree.
The 624-pin LGA requires a fine-pitch land pattern with careful paste stencil design; LGAs have no compliant leads, so coplanarity and board flatness are critical for reliable solder joints in vibration environments. Follow the Microchip RTAX-S/SL datasheet LG624 footprint dimensions and IPC-recommended LGA assembly practices. Use through-vias or in-pad vias judiciously for the many ground pins, and confirm with your contract manufacturer's LGA assembly capability.
The RTAX250S is one-time programmable (antifuse): there is no re-work path after programming, so complete timing closure and hardware validation - ideally via the AC170 Axcelerator prototyping flow - before committing flight units. Pin assignments differ between packages (e.g., CQ352 vs LG624), so never reuse pin constraints from other packages; regenerate the pin mapping from the LG624 tables in the RTAX-S/SL datasheet.
With 248 user I/Os at speeds approaching the family's 649 MHz capability, manage simultaneous switching noise by distributing I/Os across banks and returning each bank to solid ground reference. Simulate flight-critical high-speed interfaces with IBIS models from Microchip, and honor setup/hold requirements of the selected I/O standards. For SEU robustness at the system level, apply triple-module redundancy to control registers in RTL regardless of the antifuse fabric's configuration immunity.
Compliance Information
Space-flow V-grade device; environmental compliance data was not stated in the verified web data as of 2026-09-02. Confirm finish and compliance certificates with Microchip for the specific order code.
