A54SX16-1TQG176I - 24K-Gate SX FPGA, TQFP-176 | Microchip
MPN: A54SX16-1TQG176I ✓ Active| Qty | Unit Price | Extended |
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Drop-in alternatives for A54SX16-1TQG176I — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
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A54SX16-2TQG176
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A54SX16-2TQG176I
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View Datasheet →A54SX16-1TQG176I Maximum Ratings & Electrical Characteristics
| Manufacturer Part Number | A54SX16-1TQG176I |
| Product Family | SX (Actel antifuse FPGA) |
| System Gates | 24000 gates |
| LABs/CLBs | 1452 |
| User I/Os | 147 |
| Supply Voltage (Core/IO) | 3 V to 3.6 V |
| Supply Voltage (Second Rail) | 4.75 V to 5.25 V |
| Operating Supply Voltage (typical) | 3.3 V, 5 V |
| Speed Grade | -1 |
| Operating Temperature | -40C to +85C (TA) |
| Package / Case | 176-LQFP / TQFP-176 (24x24 mm) |
| Mounting Type | Surface Mount (SMD/SMT) |
| Programming Technology | Antifuse (one-time programmable) |
| Packaging | Tray |
| RoHS Status | ROHS3 Compliant, Lead Free |
| Product Status | Active |
| Manufacturer Lead Time | 10 weeks |
A54SX16-1TQG176I 176-lqfp / tqfp-176 (24x24 mm) Pin Configuration Guide
Complete pinout information for A54SX16-1TQG176I (176-lqfp / tqfp-176 (24x24 mm) 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 A54SX16-1TQG176I.
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
A54SX16-1TQG176I is suitable for 6 applications: Industrial Control and Automation, Legacy 5V System Interface Bridging, High-Reliability and Security-Oriented Logic, Communication Equipment Control Plane, Obsolete CPLD/PAL Logic Consolidation, Test and Measurement Instrument Logic.
Industrial Control and Automation
The A54SX16-1TQG176I fits industrial control and factory automation systems where deterministic, instantly-available logic is required at power-up and the operating environment spans -40C to +85C. Its 24,000 system gates and 147 user I/Os provide ample capacity for PLC I/O mapping, encoder interface decoding, and interlock logic, while the industrial temperature grade removes the need for convection-controlled cabinets. The dual supply architecture (3.0-3.6V core/IO with 4.75-5.25V rail) lets designers bridge legacy 5V sensor and actuator signaling to 3.3V subsystems on a single chip, replacing multiple discrete glue-logic devices. Because configuration is stored in antifuses, there is no configuration PROM to fail in high-vibration machinery, improving MTBF. Design the I/O for the -1 speed grade timing and confirm worst-case setup/hold in Libero static timing analysis before freezing the PCB.
Recommended
Legacy 5V System Interface Bridging
Many installed systems still run 5V TTL or 5V CMOS buses, and the A54SX16-1TQG176I's second supply rail (4.75V to 5.25V) makes it one of the few still-active FPGAs that can live natively in such environments. The 147 user I/Os assigned to the 5V-tolerant bank can directly terminate 5V signals, level-translate to the 3.0-3.6V core domain, and implement bus arbitration, address decoding, and wait-state generation for legacy backplanes. Compared with discrete level-shifters and PAL/GAL devices, one SX16 integrates the translation plus the logic, cutting board area and inventory. Verify the exact 5V input thresholds in the 54SX datasheet DC characteristics for your VCCI corner, and add series termination on long backplane traces to control reflections, since the -1 grade output edges are fast enough to matter even in 5V systems.
Recommended
High-Reliability and Security-Oriented Logic
The A54SX16-1TQG176I suits high-reliability control logic because its antifuse configuration is one-time-programmable: there is no configuration bitstream in external flash to read, clone, or corrupt, and no configuration upset from single-event effects on SRAM configuration cells. This is the classic Actel argument for defense-adjacent, avionics support, and secure industrial equipment. The 24K-gate capacity covers checksum engines, secure key-handling support logic, voter circuits, and watchdog/monitoring functions. The industrial -40C to +85C grade covers most harsh environments, and for full space qualification Microchip's RTAX family on the same antifuse heritage is the upgrade path (e.g., RTAX2000S devices). Note that antifuse programming is irreversible - hold design reviews before tape-out of the programming file, and purchase programmer-supported speed grades consistent across the build to keep lot timing uniform.
Recommended
Communication Equipment Control Plane
In telecom and networking line cards, the A54SX16-1TQG176I implements the non-time-critical control plane: backplane ID coding, LED driving, fan monitoring, hot-swap state machines, and MAC/PHY management interfaces such as MDIO. Its instant-on antifuse boot means the FPGA is functional the moment power arrives - valuable for power-good sequencing and fault reporting before a host processor loads software. With 147 I/Os, one device absorbs the many small control signals that would otherwise consume a CPLD plus discrete logic. The 3.0-3.6V rail matches standard card logic while the 4.75-5.25V rail serves legacy shelf hardware. Designers should budget standby power across both rails in rack-level thermal calculations and keep JTAG access on the 176-TQFP dedicated pins for field diagnostics even though reprogramming is not possible.
Recommended
Obsolete CPLD/PAL Logic Consolidation
A common retrofit task is consolidating dozens of aging 22V10 PALs, GALs, or EPM7000-style CPLDs that are end-of-life. The A54SX16-1TQG176I's 1,452 LAB/CLB capacity and 24K gates absorb multiple such devices while its dual-rail operation eases integration into older boards that mix 5V and 3.3V domains. Consolidation reduces component count, improves timing consistency between formerly separate devices, and removes sourcing risk from multiple obsolete SKUs. Map each legacy device into a Libero project, run timing at the -1 grade, and pay special attention to asynchronous paths such as reset distribution, which the antifuse fabric routes with different delays than the original devices. Because programming is one-time, validate the consolidated design in simulation thoroughly before committing hardware; keep the A54SX16-2TQG176 as a same-footprint timing upgrade if margins are tight.
Recommended
Test and Measurement Instrument Logic
Bench and rack instruments benefit from the A54SX16-1TQG176I as a sequencer, trigger-logic engine, and interface bridge. The 24K-gate fabric implements trigger state machines, timebase gating, and pattern generation for custom test fixtures, while the 147 I/Os connect to front-panel controls, relay banks, and measurement front ends. Instant-on antifuse configuration means the instrument is ready the moment mains power is applied - no boot delay that customers perceive as sluggishness. The industrial temperature rating supports uncooled rack environments, and the TQFP-176's 0.5mm pitch keeps assembly on standard SMT lines. For timing-critical paths, remember the -1 grade is the slowest SX16 option; static timing analysis in Libero against the 3.3V commercial corner should be completed before the test-firmware team locks external timing assumptions.
Recommended
Recommended Products Summary
Engineering reference data for A54SX16-1TQG176I — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | A54SX16-2TQG176 | A54SX16-1TQG176 | A54SX16-TQG176I |
|---|---|---|---|---|
| Brand | Microchip Technology (Actel/Microsemi) | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | TQFP-176 (24x24 mm) | TQFP-176 (24x24 mm) - same | TQFP-176 (24x24 mm) - same | TQFP-176 (24x24 mm) - same |
| System Gates | 24000 | 24000 | 24000 | 24000 |
| User I/Os | 147 | 147 | 147 | 147 |
| Speed Grade | -1 (standard) | -2 (faster) | -1 (standard) | [DATA_NEEDED] |
| Operating Temperature | -40C to +85C (I grade) | 0C to +70C (commercial) | 0C to +70C (commercial) | -40C to +85C (I grade) |
| Supply Voltage | 3V-3.6V, 4.75V-5.25V | 3V-3.6V, 4.75V-5.25V | 3V-3.6V, 4.75V-5.25V | 3V-3.6V, 4.75V-5.25V |
| RoHS / Lead Free | ROHS3 Compliant, Lead Free | ROHS3 Compliant (G suffix) | ROHS3 Compliant (G suffix) | Lead Free / RoHS Compliant |
Key Differentiators
- Industrial temperature range for harsh environments (vs A54SX16-1TQG176)
- Lowest-cost speed grade with upgrade path (vs A54SX16-2TQG176)
- Dual-rail 5V compatibility increasingly rare in FPGAs (vs A54SX16-TQG176I variants and modern SRAM FPGAs)
Design Notes
The A54SX16-1TQG176I requires two supply rails: 3.0V-3.6V (3.3V nominal) and 4.75V-5.25V (5.0V nominal). Verify rail sequencing requirements in the 54SX datasheet power-up section, as Actel antifuse FPGAs of this era specify which rail must arrive first and ramp-rate limits. Decouple each rail with bulk capacitance plus 0.1uF ceramics distributed across the four VCC pin groups of the 176-TQFP. Budget static power for both rails continuously, since antifuse FPGAs draw standby current from power-on - important in battery-backed and always-on industrial equipment.
Antifuse programming is permanent - there is no rework path. Complete full simulation, static timing analysis at the -1 speed grade across voltage and temperature corners, and design review before generating the programming file. The -1 grade is the slowest SX16 speed grade; if timing margins are under 20%, plan a same-footprint -2 variant (e.g., A54SX16-2TQG176) as contingency. Also, the commercial-grade variants (A54SX16-1TQG176, A54SX16-2TQG176) are rated 0C to +70C and must not be substituted into the industrial -40C to +85C application of the -I part.
The TQFP-176 has 0.5mm lead pitch with leads on all four sides of the 24x24 mm body. Use a courtyard footprint matching the datasheet mechanical drawing, fan out with 0.2-0.25mm traces and thermal reliefs on ground connections. Inspect with X-ray or AOI for solder bridging, a common defect on 0.5mm-pitch QFPs. Keep high-speed I/O stubs short and add series resistors (22-33 ohm) on long or backplane-routed signals to control ringing; the 5V-tolerant bank used for legacy interfaces should follow the same SI rules as the 3.3V bank.
Since the device requires no external configuration PROM, reserve board area for a JTAG header on the dedicated programming pins for production programming and boundary-scan test. Actel Designer supports pin assignment locking; lock your pinout early and re-run timing after every routing change, because antifuse routing delay varies with route length and the final programmed netlist is what matters, not the post-synthesis estimate.
Compliance Information
ROHS3 Compliant and lead free per Microchip USA and Newark product data (G suffix = lead-free/green package). REACH, halogen-free, and conflict-minerals status not stated in the reviewed data.
