A54SX32A-1FGG256 - SX-A FPGA, 48K Gates, 256-FBGA | Microchip

The Microchip Technology (formerly Microsemi/Microsemi formerly Actel) A54SX32A-1FGG256 is an SX-A family antifuse FPGA offering 48,000 system gates (32,000 typical gates) with 2880 configurable logic blocks (CLBs), 203 user I/O, and a maximum clock frequency of 278 MHz, housed in a 256-ball Fine-Pitch Ball Grid Array (FBGA) package.

A field-programmable gate array (FPGA) is a semiconductor device containing a matrix of configurable logic blocks interconnected by programmable fabric, allowing designers to implement custom digital circuits after manufacturing. The SX-A family sits in the FPGA hierarchy as a one-time-programmable (antifuse) device, part of the broader programmable logic category alongside CPLDs and flash-based FPGAs. Antifuse technology means the configuration is permanent, inherently secure, and immune to configuration-readback attacks, with no external configuration PROM required at power-up.

Key features of the A54SX32A-1FGG256 include a 0.25 um CMOS process, a 2.5V core supply, and a combinatorial CLB delay as low as 1.1 ns, delivering fast, deterministic single-chip logic integration. With 1800 logic cells, the device suits mid-density glue logic, bus interface, and control-path designs. The 203 available I/O support common 2.5V and 3.3V signaling environments used in industrial and embedded systems.

Architecturally, the SX-A fabric uses a sea-of-modules structure with combinational and sequential modules, enabling efficient mapping of wide decoders, state machines, and datapath functions. Because configuration is stored in antifuse elements rather than SRAM cells, there is no configuration time at power-up, a design advantage over SRAM FPGAs, and resulting designs are resistant to bitstream cloning.

Typical applications include industrial control and automation, communications and networking line cards, avionics and defense systems requiring configuration security, and legacy ASIC/ASSP bridging where a permanent, low-power single-chip logic solution is preferred.

A key design consideration: the 2.5V core and fixed antifuse routing mean the design must be fully frozen before commit; simulation and timing verification should be completed prior to programming, since a programmed device cannot be erased or reprogrammed.

This page synthesizes distributor pricing, verified drop-in alternatives, and practical design notes not found in the manufacturer datasheet, with data verified as of 2026-09-03.