LFE5U-45
LatticeECP5The LFE5U-45 is an ECP5 FPGA from Lattice, built on a 40 nm process. It provides 44,000 LUT4 look-up tables, 1.9 Mb of block RAM and 72 18×18 multipliers. It offers up to 245 user I/O pins. It is available in 5 packages, from the csfBGA285 (10 × 10 mm) to the caBGA554 (23 × 23 mm). Designs are built with Lattice Diamond.
Specifications
| Vendor | Lattice |
|---|---|
| Family | ECP5 |
| Series | ECP5 |
| Process | 40 nm |
| Configuration memory | SRAM |
| LUT4-equivalent capacity | 44,000 |
| Look-up tables (LUT4) | 44,000 |
| Distributed RAM | 351 Kb |
| Block RAM | 1.9 Mb (108 × 18 Kb) |
| DSP (18×18 multiplier) | 72 |
| Max. user I/O | 245 |
|---|---|
| Transceivers | None |
| PCI Express | None |
| Analog / monitor | None |
| Design tool | Lattice Diamond |
Packages
| Package | Size (mm) | Pitch (mm) | User I/O | Transceivers |
|---|---|---|---|---|
| TQFP144 | 20 × 20 | 0.5 | 98 | — |
| csfBGA285 | 10 × 10 | 0.5 | 118 | — |
| caBGA256 | 14 × 14 | 0.8 | 197 | — |
| caBGA381 | 17 × 17 | 0.8 | 203 | — |
| caBGA554 | 23 × 23 | 0.8 | 245 | — |
Package names are shown as in the selection guide; the full ordering code adds speed grade and temperature (see the data sheet).
Alternatives to the LFE5U-45
Closest matches in other families and vendors by logic, DSP, memory, I/O and transceivers. Check pin compatibility and tools before migrating.
| Device | LUT4-eq. | Vendor logic | DSP | Block RAM | Max I/O | Transceivers | PCIe |
|---|---|---|---|---|---|---|---|
| 5CEA4Altera Cyclone V | 37K 18.5K ALMs | 49K LE | 66 | 3 Mb | 224 | — | — |
| Ti40Efinix Titanium | ≈38.9K 38.9K LEs | 38.9K LE | 100 | 1.5 Mb | 183 | — | — |
| Ti35Efinix Titanium | 35.5K 35.5K LUT4 | 36.2K LE | 93 | 1.5 Mb | 169 | — | — |
| LIFCL-40Lattice CrossLink-NX | 32.5K 32.5K LUT4 | 39K LC | 56 | 1.5 Mb | 191 | — | Gen2 |
| XC7S50AMD Spartan-7 | 52.2K 32.6K LUT6 | 52.2K LC | 120 | 2.6 Mb | 250 | — | — |
| GW5A-60Gowin Arora V | 59.9K 59.9K LUT4 | — | 118 | 2.1 Mb | 320 | — | — |
Compare side by side: LFE5U-45 vs 5CEA4, LFE5U-45 vs Ti40, LFE5U-45 vs Ti35.
LFE5U-45 quick facts
How many LUTs does the LFE5U-45 have?
The LFE5U-45 has 44,000 LUT4 look-up tables, about 44,000 LUT4 equivalents.
How many DSP blocks does the LFE5U-45 have?
The LFE5U-45 has 72 18×18 multipliers and 1.9 Mb of block RAM.
Does the LFE5U-45 have transceivers?
No, the LFE5U-45 has no multi-gigabit transceivers. Its user I/O supports up to 245 pins.
What are the alternatives to the LFE5U-45?
Devices of similar size in other families include 5CEA4 (Altera Cyclone V), Ti40 (Efinix Titanium), Ti35 (Efinix Titanium).
Which software is used to design with the LFE5U-45?
Designs for the LFE5U-45 are built with Lattice Diamond.
Other ECP5 devices
| Device | LUT4-eq. | Vendor logic | DSP | Block RAM | Max I/O | Transceivers | PCIe |
|---|---|---|---|---|---|---|---|
| LFE5U-12 | 12K 12K LUT4 | — | 28 | 0.6 Mb | 197 | — | — |
| LFE5UM-25 | 24K 24K LUT4 | — | 28 | 1 Mb | 197 | 2 SERDES 3.2 Gb/s | — |
| LFE5UM5G-25 | 24K 24K LUT4 | — | 28 | 1 Mb | 197 | 2 SERDES 5 Gb/s | — |
| LFE5U-25 | 24K 24K LUT4 | — | 28 | 1 Mb | 197 | — | — |
| LFE5UM-45 | 44K 44K LUT4 | — | 72 | 1.9 Mb | 245 | 4 SERDES 3.2 Gb/s | — |
| LFE5UM5G-45 | 44K 44K LUT4 | — | 72 | 1.9 Mb | 245 | 4 SERDES 5 Gb/s | — |
| LFE5U-45 | 44K 44K LUT4 | — | 72 | 1.9 Mb | 245 | — | — |
| LFE5UM-85 | 84K 84K LUT4 | — | 156 | 3.7 Mb | 365 | 4 SERDES 3.2 Gb/s | — |
| LFE5UM5G-85 | 84K 84K LUT4 | — | 156 | 3.7 Mb | 365 | 4 SERDES 5 Gb/s | — |
| LFE5U-85 | 84K 84K LUT4 | — | 156 | 3.7 Mb | 365 | — | — |
Source: Lattice ECP5 product page, Family Table, retrieved 2026-10-24. Data is extracted automatically from the vendor's selection guide; verify critical values in the device data sheet.