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RTSX-SU Radiation-Tolerant FPGAs

High-Reliability, Radiation-Tolerant, Antifuse-Based FPGAs

The RTSX-SU family is a unique product offering for space applications. RTSX-SU radiation-tolerant FPGAs feature SEU-hardened D-type flip-flops that offer the benefits of Triple Module Redundancy (TMR) without the associated overhead. Manufactured using 0.25 µm technology at the United Microelectronics Corporation (UMC) facility in Taiwan, RTSX-SU FPGAs offer levels of radiation survivability that greatly exceed those of typical CMOS devices.

Features

  • Highly reliable, nonvolatile antifuse technology
  • Low power
  • Up to 360 user-programmable I/Os
  • Hermetically sealed packages for space applications (CQFP, CCGA/LGA, CCLG)

Radiation Tolerance

  • SEU-hardened registers that eliminate the need to implement TMR
  • Immune to Single-Event Upsets (SEUs) to LETTH > 40 MeV-cm2/mg
  • SEU rate < E10-10 upsets/bit-day in worst-case geosynchronous orbit
  • Up to 100 krad (Si) Total Ionizing Dose (TID)
  • Single-Event Latch-Up (SEL) immunity

Qualification 

  • QML class Q qualification
  • Heritage in many major programs including Pluto New Horizons, Juno, GOES-R and Iridium NEXT

Learn About Our Space FPGA Portfolio

Radiation and Reliability 

Radiation-Tolerant FPGAs

Sub-QML FPGAs

Products 

Device

RTSX32SU

RTSX72SU

Typical Gates

32,000

72,000

System Gates

48,000

108,000

Logic Modules

2,880

6,036

Combinatorial Cells

1,800

4,024

SEU-Hardened Register Cells

1,080

2,012

Maximum Flip-Flops

1,980

4,024

Maximum User I/Os

227

360

Clocks

3

3

Quadrant Clocks

0

4

Speed Grades

STD,-1

STD, -1

Qualification

B,E,M

B,E

CCGA/LGA Package

256 CCLG

624 CCGA

CQFP Package

84/208/256

208/256

Documentation

Search Documentation
Showing for
Document Category Title Date
Supporting Collateral
RT54SX-S Tr/Tf Experiment 		06 Jul 2004
Supporting Collateral
RT54SX Tr/Tf Experiment 		06 Jul 2004
User Guide
RadHard/RadTolerant Programming Guide 		30 Mar 2003
Supporting Collateral
Achieving High Performance in Military and Aerospace Applications 		25 Nov 2003
Supporting Collateral
Power Supply Transients on RTAX-S and RTSX-SU Devices White Paper 		13 Feb 2020
Supporting Collateral
Enhanced Qualification and Lot Acceptance Procedures 		25 Aug 2005
Application Notes
AC149: Design Migration from the RT54SX32 to the RT54SX32S Device App Note 		14 Jan 2003 Design Files
Application Notes
AC251: Power Cycling of RTSX-S Devices App Note 		22 Mar 2004 Design Files
Application Notes
AC198: Clock Skew and Short Paths Timing App Note 		17 Mar 2004 Design Files
Application Notes
AC172: Post-Programming Burn-In (PPBI) for Actel RT54SX-S and SX-A FPGAs App Note 		15 Jan 2003 Design Files
Application Notes
AC233: Electro-Static Discharge App Note 		14 Jul 2005 Design Files
Application Notes
AC158: Microsemi SX-A and RTSX-SU Devices in Hot-Swap and Cold-Sparing Applications App Note 		14 Jan 2003 Design Files
Application Notes
AC200: Actel eX, SX-A and RTSX-S I/Os App Note 		14 Jan 2003 Design Files
Application Notes
AC169: Using A54SX72A and RT54SX72S Quadrant Clocks App Note 		05 Feb 2003 Design Files
Application Notes
AC308: Antifuse MetaReport AN 		06 May 2013 Design Files
Application Notes
AC379: Advanced Static Timing Analysis Using SmartTime App Note 		30 Oct 2011 Design Files
Application Notes
AC263: Simultaneous Switching Noise and Signal Integrity 		19 Feb 2003 Design Files
Application Notes
AN6216: Board-Level Considerations of Antifuse and Older Flash FPGAs Application Note (Earlier AC276) 		04 Nov 2025 Design Files
Application Notes
AC160: IEEE Standard 1149.1 (JTAG) in the SX/RTSX/SX-A/eX/RT54SX-S Families App Note 		14 Jan 2003 Design Files
Application Notes
Source-Synchronous Clock Designs: Timing Constraints and Analysis App Note 		02 Aug 2011 Design Files
Application Notes
AC274: CQFP to FBGA Adapter Sockets App Note 		18 Jan 2004 Design Files
Application Notes
AC341: Microsemi CCGA to CLGA Adapter Socket Application Note 		03 Mar 2010 Design Files
Application Notes
AC342: CQFP to CLGA Adapter Socket Application Note 		03 Mar 2010 Design Files
Application Notes
AN5557: Ceramic Column Grid Array 		24 Mar 2025 Design Files
Application Notes
Moisture Sensitivity Application Note 		19 Jan 2026 Design Files
Application Notes
AC193: Ceramic Chip Carrier Land Grid (CC256) Package Handling App Note 		23 Nov 2003 Design Files
Board Design Files
RTSX-S/RTSX-SU IBIS Model - All I/O Configurations 		06 Mar 2005
Board Design Files
Design-Based (Custom) RTSX-S/RTSX-SU IBIS Model Generation Script 		11 Feb 2009
IBIS
RTSX16/RTSX32 IBIS Model Mixed Voltage Operation 		08 Apr 2024
Data Sheets
HiRel SX-A Family FPGAs Datasheet 		14 Jan 2003
CQ208-RTSX.zip 		12 Aug 2022
Data Sheets
RTSX-SU RadTolerant FPGAs (UMC) Datasheet 		20 Jun 2004
CC256-RTSX32SU.xlsx 		12 Aug 2022
CG624-RTSX72SU.xlsx 		12 Aug 2022
CQ84-RTSX32SU.xlsx 		12 Aug 2022
Data Sheets
PD3068: Package Mechanical Drawings Datasheet 		12 Sep 2025
Board Design Files
RT54SX32S-CG256 BSDL 		08 Mar 2005
Board Design Files
RT54SX32S-CQ208 BSDL 		08 Mar 2005
Board Design Files
RT54SX32S-CQ256 BSDL 		08 Mar 2005
Board Design Files
RT54SX72S-CG624 BSDL 		08 Mar 2005
Board Design Files
RT54SX72S-CQ208 BSDL 		08 Mar 2005
Board Design Files
RT54SX72S-CQ256 BSDL 		08 Mar 2005
Board Design Files
RT54SX32S-CQ84 BSDL 		12 May 2010
Supporting Collateral
eX, SX-A and RT54SX-S Power Calculator 		19 Mar 2003
Application Notes
AC174: Assembly Instructions for CQFP Packages SMT on PCB 		06 May 2013 Design Files
Application Notes
AC220: Package Thermal Characteristics 		06 May 2013 Design Files
Application Notes
AC243: Assembly and PCB Layout Guidelines for Chip-Scale Packages 		06 May 2013 Design Files
Packaging Specifications
Solder Reflow Profile for Standard and Lead-Free Packages 		07 May 2013
Packaging Specifications
Package Thermal Characteristics and Weights 		05 Jun 2003
Packaging Specifications
Hermetic Package MechanicalConfiguration 		15 Jan 2003
Packaging Specifications
Microchip SoC RoHS Certificate of Compliance 		07 May 2013
Packaging Specifications
Backward Compatibility of RoHS Compliant components 		07 May 2013
User Guide
Prohibitive Substances 		07 May 2013
User Guide
Visual Inspection Criteria for Microchip CQFP Packages 		07 May 2013
User Guide
Tray Drawings 		04 Jun 2003
User Guide
Leadframe Rework on Microchip CQFP Packages 		07 May 2013
User Guide
Package Material Information 		19 Jan 2026
Packaging Specifications
Use of Pure Tin Components Intended for Space Application 		07 May 2013
Packaging Specifications
CCGA Board Level Testing Report 		07 May 2013
Packaging Specifications
EU RoHS and PFOS, PFOA, and Deca-BDE Compliance Customer Letter 		07 May 2013
Application Notes
AC275: Actel CCGA to FBGA Adapter Socket Instructions 		07 Oct 2003 Design Files
User Guide
Mechanical Drawings for the RTSX Adapter Board 		05 Jun 2003
Application Notes
AC195: Prototyping for the RT54SX-S Enhanced Aerospace FPGA 		14 Jan 2003 Design Files
Board Design Files
EIA Standard Board Layout Drawing for BGA, CCGA, CSP, and QFN 		07 May 2013
Packaging Specifications
EIA Standard Board Layout of Soldered Pad for QFP Devices and QFP Surface Mount Socket 		07 May 2013
Document Category
Title
Date
Supporting Collateral
RT54SX-S Tr/Tf Experiment
06 Jul 2004
Document Category
Title
Date
Supporting Collateral
RT54SX Tr/Tf Experiment
06 Jul 2004
Document Category
Title
Date
User Guide
RadHard/RadTolerant Programming Guide
30 Mar 2003
Document Category
Title
Date
Supporting Collateral
Achieving High Performance in Military and Aerospace Applications
25 Nov 2003
Document Category
Title
Date
Supporting Collateral
Power Supply Transients on RTAX-S and RTSX-SU Devices White Paper
13 Feb 2020
Document Category
Title
Date
Supporting Collateral
Enhanced Qualification and Lot Acceptance Procedures
25 Aug 2005
Document Category
Title
Date
Application Notes
AC149: Design Migration from the RT54SX32 to the RT54SX32S Device App Note
14 Jan 2003
Document Category
Title
Date
Application Notes
AC251: Power Cycling of RTSX-S Devices App Note
22 Mar 2004
Document Category
Title
Date
Application Notes
AC198: Clock Skew and Short Paths Timing App Note
17 Mar 2004
Document Category
Title
Date
Application Notes
AC172: Post-Programming Burn-In (PPBI) for Actel RT54SX-S and SX-A FPGAs App Note
15 Jan 2003
Document Category
Title
Date
Application Notes
AC233: Electro-Static Discharge App Note
14 Jul 2005
Document Category
Title
Date
Application Notes
AC158: Microsemi SX-A and RTSX-SU Devices in Hot-Swap and Cold-Sparing Applications App Note
14 Jan 2003
Document Category
Title
Date
Application Notes
AC200: Actel eX, SX-A and RTSX-S I/Os App Note
14 Jan 2003
Document Category
Title
Date
Application Notes
AC169: Using A54SX72A and RT54SX72S Quadrant Clocks App Note
05 Feb 2003
Document Category
Title
Date
Application Notes
AC308: Antifuse MetaReport AN
06 May 2013
Document Category
Title
Date
Application Notes
AC379: Advanced Static Timing Analysis Using SmartTime App Note
30 Oct 2011
Document Category
Title
Date
Application Notes
AC263: Simultaneous Switching Noise and Signal Integrity
19 Feb 2003
Document Category
Title
Date
Application Notes
AN6216: Board-Level Considerations of Antifuse and Older Flash FPGAs Application Note (Earlier AC276)
04 Nov 2025
Document Category
Title
Date
Application Notes
AC160: IEEE Standard 1149.1 (JTAG) in the SX/RTSX/SX-A/eX/RT54SX-S Families App Note
14 Jan 2003
Document Category
Title
Date
Application Notes
Source-Synchronous Clock Designs: Timing Constraints and Analysis App Note
02 Aug 2011
Document Category
Title
Date
Application Notes
AC274: CQFP to FBGA Adapter Sockets App Note
18 Jan 2004
Document Category
Title
Date
Application Notes
AC341: Microsemi CCGA to CLGA Adapter Socket Application Note
03 Mar 2010
Document Category
Title
Date
Application Notes
AC342: CQFP to CLGA Adapter Socket Application Note
03 Mar 2010
Document Category
Title
Date
Application Notes
AN5557: Ceramic Column Grid Array
24 Mar 2025
Document Category
Title
Date
Application Notes
Moisture Sensitivity Application Note
19 Jan 2026
Document Category
Title
Date
Application Notes
AC193: Ceramic Chip Carrier Land Grid (CC256) Package Handling App Note
23 Nov 2003
Document Category
Title
Date
Board Design Files
RTSX-S/RTSX-SU IBIS Model - All I/O Configurations
06 Mar 2005
Document Category
Title
Date
Board Design Files
Design-Based (Custom) RTSX-S/RTSX-SU IBIS Model Generation Script
11 Feb 2009
Document Category
Title
Date
IBIS
RTSX16/RTSX32 IBIS Model Mixed Voltage Operation
08 Apr 2024
Document Category
Title
Date
Data Sheets
HiRel SX-A Family FPGAs Datasheet
14 Jan 2003
Document Category
Title
Date
CQ208-RTSX.zip
12 Aug 2022
Document Category
Title
Date
Data Sheets
RTSX-SU RadTolerant FPGAs (UMC) Datasheet
20 Jun 2004
Document Category
Title
Date
CC256-RTSX32SU.xlsx
12 Aug 2022
Document Category
Title
Date
CG624-RTSX72SU.xlsx
12 Aug 2022
Document Category
Title
Date
CQ84-RTSX32SU.xlsx
12 Aug 2022
Document Category
Title
Date
Data Sheets
PD3068: Package Mechanical Drawings Datasheet
12 Sep 2025
Document Category
Title
Date
Board Design Files
RT54SX32S-CG256 BSDL
08 Mar 2005
Document Category
Title
Date
Board Design Files
RT54SX32S-CQ208 BSDL
08 Mar 2005
Document Category
Title
Date
Board Design Files
RT54SX32S-CQ256 BSDL
08 Mar 2005
Document Category
Title
Date
Board Design Files
RT54SX72S-CG624 BSDL
08 Mar 2005
Document Category
Title
Date
Board Design Files
RT54SX72S-CQ208 BSDL
08 Mar 2005
Document Category
Title
Date
Board Design Files
RT54SX72S-CQ256 BSDL
08 Mar 2005
Document Category
Title
Date
Board Design Files
RT54SX32S-CQ84 BSDL
12 May 2010
Document Category
Title
Date
Supporting Collateral
eX, SX-A and RT54SX-S Power Calculator
19 Mar 2003
Document Category
Title
Date
Application Notes
AC174: Assembly Instructions for CQFP Packages SMT on PCB
06 May 2013
Document Category
Title
Date
Application Notes
AC220: Package Thermal Characteristics
06 May 2013
Document Category
Title
Date
Application Notes
AC243: Assembly and PCB Layout Guidelines for Chip-Scale Packages
06 May 2013
Document Category
Title
Date
Packaging Specifications
Solder Reflow Profile for Standard and Lead-Free Packages
07 May 2013
Document Category
Title
Date
Packaging Specifications
Package Thermal Characteristics and Weights
05 Jun 2003
Document Category
Title
Date
Packaging Specifications
Hermetic Package MechanicalConfiguration
15 Jan 2003
Document Category
Title
Date
Packaging Specifications
Microchip SoC RoHS Certificate of Compliance
07 May 2013
Document Category
Title
Date
Packaging Specifications
Backward Compatibility of RoHS Compliant components
07 May 2013
Document Category
Title
Date
User Guide
Prohibitive Substances
07 May 2013
Document Category
Title
Date
User Guide
Visual Inspection Criteria for Microchip CQFP Packages
07 May 2013
Document Category
Title
Date
User Guide
Tray Drawings
04 Jun 2003
Document Category
Title
Date
User Guide
Leadframe Rework on Microchip CQFP Packages
07 May 2013
Document Category
Title
Date
User Guide
Package Material Information
19 Jan 2026
Document Category
Title
Date
Packaging Specifications
Use of Pure Tin Components Intended for Space Application
07 May 2013
Document Category
Title
Date
Packaging Specifications
CCGA Board Level Testing Report
07 May 2013
Document Category
Title
Date
Packaging Specifications
EU RoHS and PFOS, PFOA, and Deca-BDE Compliance Customer Letter
07 May 2013
Document Category
Title
Date
Application Notes
AC275: Actel CCGA to FBGA Adapter Socket Instructions
07 Oct 2003
Document Category
Title
Date
User Guide
Mechanical Drawings for the RTSX Adapter Board
05 Jun 2003
Document Category
Title
Date
Application Notes
AC195: Prototyping for the RT54SX-S Enhanced Aerospace FPGA
14 Jan 2003
Document Category
Title
Date
Board Design Files
EIA Standard Board Layout Drawing for BGA, CCGA, CSP, and QFN
07 May 2013
Document Category
Title
Date
Packaging Specifications
EIA Standard Board Layout of Soldered Pad for QFP Devices and QFP Surface Mount Socket
07 May 2013

Application Notes

Title
Date
AC149: Design Migration from the RT54SX32 to the RT54SX32S Device App Note 14 Jan 2003 Link
AC251: Power Cycling of RTSX-S Devices App Note 22 Mar 2004 Link
AC198: Clock Skew and Short Paths Timing App Note 17 Mar 2004 Link
AC172: Post-Programming Burn-In (PPBI) for Actel RT54SX-S and SX-A FPGAs App Note 15 Jan 2003 Link
AC233: Electro-Static Discharge App Note 14 Jul 2005 Link
AC158: Microsemi SX-A and RTSX-SU Devices in Hot-Swap and Cold-Sparing Applications App Note 14 Jan 2003 Link
AC200: Actel eX, SX-A and RTSX-S I/Os App Note 14 Jan 2003 Link
AC169: Using A54SX72A and RT54SX72S Quadrant Clocks App Note 05 Feb 2003 Link
AC308: Antifuse MetaReport AN 06 May 2013 Link
AC379: Advanced Static Timing Analysis Using SmartTime App Note 30 Oct 2011 Link
AC263: Simultaneous Switching Noise and Signal Integrity 19 Feb 2003 Link
AN6216: Board-Level Considerations of Antifuse and Older Flash FPGAs Application Note (Earlier AC276) 04 Nov 2025 Link
AC160: IEEE Standard 1149.1 (JTAG) in the SX/RTSX/SX-A/eX/RT54SX-S Families App Note 14 Jan 2003 Link
Source-Synchronous Clock Designs: Timing Constraints and Analysis App Note 02 Aug 2011 Link
AC274: CQFP to FBGA Adapter Sockets App Note 18 Jan 2004 Link
AC341: Microsemi CCGA to CLGA Adapter Socket Application Note 03 Mar 2010 Link
AC342: CQFP to CLGA Adapter Socket Application Note 03 Mar 2010 Link
AN5557: Ceramic Column Grid Array 24 Mar 2025 Link
Moisture Sensitivity Application Note 19 Jan 2026 Link
AC193: Ceramic Chip Carrier Land Grid (CC256) Package Handling App Note 23 Nov 2003 Link
Data Sheets
IBIS Models
BSDL Models
Packaging/PPATs

Data Sheets

Title
Date
RTSX-SU RadTolerant FPGAs (UMC) Datasheet 20 Jun 2004
HiRel SX-A Family FPGAs Datasheet 14 Jan 2003
PD3068: Package Mechanical Drawings Datasheet 12 Sep 2025
CQ84-RTSX32SU.xlsx 12 Aug 2022
CQ208-RTSX.zip 12 Aug 2022
CC256-RTSX32SU.xlsx 12 Aug 2022
CG624-RTSX72SU.xlsx 12 Aug 2022

IBIS Models

Title
Date
RTSX-S/RTSX-SU IBIS Model - All I/O Configurations 06 Mar 2005
Design-Based (Custom) RTSX-S/RTSX-SU IBIS Model Generation Script 11 Feb 2009
RTSX16/RTSX32 IBIS Model Mixed Voltage Operation 08 Apr 2024

BSDL Models

Title
Date
RT54SX32S-CG256 BSDL 08 Mar 2005
RT54SX32S-CQ208 BSDL 08 Mar 2005
RT54SX32S-CQ256 BSDL 08 Mar 2005
RT54SX72S-CG624 BSDL 08 Mar 2005
RT54SX72S-CQ208 BSDL 08 Mar 2005
RT54SX72S-CQ256 BSDL 08 Mar 2005
RT54SX32S-CQ84 BSDL 12 May 2010

Packaging/PPATs

Title
Date
AC174: Assembly Instructions for CQFP Packages SMT on PCB 06 May 2013
AC220: Package Thermal Characteristics 06 May 2013
AC243: Assembly and PCB Layout Guidelines for Chip-Scale Packages 06 May 2013
AC274: CQFP to FBGA Adapter Sockets App Note 18 Jan 2004
AC341: Microsemi CCGA to CLGA Adapter Socket Application Note 03 Mar 2010
AC342: CQFP to CLGA Adapter Socket Application Note 03 Mar 2010
AN5557: Ceramic Column Grid Array 24 Mar 2025
Moisture Sensitivity Application Note 19 Jan 2026
Solder Reflow Profile for Standard and Lead-Free Packages 07 May 2013
AC193: Ceramic Chip Carrier Land Grid (CC256) Package Handling App Note 23 Nov 2003
Package Thermal Characteristics and Weights 05 Jun 2003
Hermetic Package MechanicalConfiguration 15 Jan 2003
Microchip SoC RoHS Certificate of Compliance 07 May 2013
Backward Compatibility of RoHS Compliant components 07 May 2013
Prohibitive Substances 07 May 2013
Visual Inspection Criteria for Microchip CQFP Packages 07 May 2013
Tray Drawings 04 Jun 2003
Leadframe Rework on Microchip CQFP Packages 07 May 2013
Package Material Information 19 Jan 2026
Use of Pure Tin Components Intended for Space Application 07 May 2013
CCGA Board Level Testing Report 07 May 2013
EU RoHS and PFOS, PFOA, and Deca-BDE Compliance Customer Letter 07 May 2013
AC275: Actel CCGA to FBGA Adapter Socket Instructions 07 Oct 2003
Mechanical Drawings for the RTSX Adapter Board 05 Jun 2003
AC195: Prototyping for the RT54SX-S Enhanced Aerospace FPGA 14 Jan 2003
EIA Standard Board Layout Drawing for BGA, CCGA, CSP, and QFN 07 May 2013
EIA Standard Board Layout of Soldered Pad for QFP Devices and QFP Surface Mount Socket 07 May 2013

User Guides

Title
Date
RadHard/RadTolerant Programming Guide 30 Mar 2003
Title
Date
eX, SX-A and RT54SX-S Power Calculator 19 Mar 2003

White Papers

Title
Date
Achieving High Performance in Military and Aerospace Applications 25 Nov 2003
Power Supply Transients on RTAX-S and RTSX-SU Devices White Paper 13 Feb 2020
Enhanced Qualification and Lot Acceptance Procedures 25 Aug 2005
Radiation Reports

Technical Papers

Title
Date
RT54SX-S Tr/Tf Experiment 06 Jul 2004
RT54SX Tr/Tf Experiment 06 Jul 2004

RTSX-SU radiation-tolerant FPGAs are enhanced versions of our commercial SX-A family of devices specifically designed for enhanced radiation performance. Featuring SEU-hardened D-type flip-flops that offer the benefits of triple module redundancy (TMR) without requiring cumbersome user intervention, the RTSX-SU family is a unique product for space applications.

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