iCE40UL1K
LatticeiCE40 UltraThe iCE40UL1K is a iCE40 Ultra FPGA from Lattice, built on a 40 nm process. It provides 1,248 LUT4 look-up tables, 0.1 Mb of block RAM, with no hard multipliers. It offers up to 26 user I/O pins. It is available in 2 packages, from the WLCSP16 (1.4 × 1.4 mm) to the ucBGA36 (2.5 × 2.5 mm). Designs are built with Lattice iCEcube2.
Specifications
| Vendor | Lattice |
|---|---|
| Family | iCE40 Ultra |
| Series | iCE40 |
| Process | 40 nm |
| Configuration memory | NVCM |
| LUT4-equivalent capacity | 1,248 |
| Look-up tables (LUT4) | 1,248 |
| Block RAM | 0.1 Mb |
| DSP (16×16 MAC) | None |
| Max. user I/O | 26 |
|---|---|
| Transceivers | None |
| PCI Express | None |
| Analog / monitor | None |
| Design tool | Lattice iCEcube2 |
Packages
| Package | Size (mm) | Pitch (mm) | User I/O | Transceivers |
|---|---|---|---|---|
| WLCSP16 | 1.4 × 1.4 | 0.35 | 10 | — |
| ucBGA36 | 2.5 × 2.5 | 0.4 | 26 | — |
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 iCE40UL1K
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 |
|---|---|---|---|---|---|---|---|
| iCE40LM1KLattice iCE40 LP/HX/LM | 1.1K 1.1K LUT4 | 1.1K LC | — | 0.1 Mb | 39 | — | — |
| GW1AN-1SGowin Arora | 1.2K 1.2K LUT4 | — | — | 0.1 Mb | 44 | — | — |
| GW1NZ-1Gowin LittleBee | 1.2K 1.2K LUT4 | — | — | 0.1 Mb | 48 | — | — |
| iCE40LM2KLattice iCE40 LP/HX/LM | 2K 2K LUT4 | 2K LC | — | 0.1 Mb | 39 | — | — |
| iCE40LP1KLattice iCE40 LP/HX/LM | 1.3K 1.3K LUT4 | 1.3K LC | — | 0.1 Mb | 97 | — | — |
| iCE40HX1KLattice iCE40 LP/HX/LM | 1.3K 1.3K LUT4 | 1.3K LC | — | 0.1 Mb | 98 | — | — |
Compare side by side: iCE40UL1K vs iCE40LM1K, iCE40UL1K vs GW1AN-1S, iCE40UL1K vs GW1NZ-1, iCE40UL1K vs iCE40LM2K.
iCE40UL1K quick facts
How many LUTs does the iCE40UL1K have?
The iCE40UL1K has 1,248 LUT4 look-up tables, about 1,248 LUT4 equivalents.
How many DSP blocks does the iCE40UL1K have?
The iCE40UL1K has no 16×16 MAC blocks and 0.1 Mb of block RAM.
Does the iCE40UL1K have transceivers?
No, the iCE40UL1K has no multi-gigabit transceivers. Its user I/O supports up to 26 pins.
What are the alternatives to the iCE40UL1K?
Devices of similar size in other families include iCE40LM1K (Lattice iCE40 LP/HX/LM), GW1AN-1S (Gowin Arora), GW1NZ-1 (Gowin LittleBee).
Which software is used to design with the iCE40UL1K?
Designs for the iCE40UL1K are built with Lattice iCEcube2.
Other iCE40 Ultra devices
| Device | LUT4-eq. | Vendor logic | DSP | Block RAM | Max I/O | Transceivers | PCIe |
|---|---|---|---|---|---|---|---|
| iCE40UL640 | 640 640 LUT4 | — | — | 0.1 Mb | 26 | — | — |
| iCE5LP1K | 1.1K 1.1K LUT4 | — | 2 | 0.1 Mb | 39 | — | — |
| iCE40UL1K | 1.2K 1.2K LUT4 | — | — | 0.1 Mb | 26 | — | — |
| iCE5LP2K | 2K 2K LUT4 | — | 4 | 0.1 Mb | 39 | — | — |
| iCE5LP4K | 3.5K 3.5K LUT4 | — | 4 | 0.1 Mb | 39 | — | — |
Source: Lattice iCE40 Ultra 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.