iCE40LM4K
LatticeiCE40 LP/HX/LMThe iCE40LM4K is a iCE40 LP/HX/LM FPGA from Lattice, built on a 40 nm process. It provides 3,520 LUT4 look-up tables, 0.1 Mb of block RAM, with no hard multipliers. It offers up to 39 user I/O pins. It is available in 3 packages, from the WLCSP25 (1.71 × 1.71 mm) to the ucBGA49 (3 × 3 mm). Designs are built with Lattice iCEcube2.
Specifications
| Vendor | Lattice |
|---|---|
| Family | iCE40 LP/HX/LM |
| Series | iCE40 |
| Process | 40 nm |
| Configuration memory | NVCM or SRAM |
| LUT4-equivalent capacity | 3,520 |
| Look-up tables (LUT4) | 3,520 |
| Logic cells | 3,520 |
| Block RAM | 0.1 Mb |
| DSP (16×16 MAC) | None |
| Max. user I/O | 39 |
|---|---|
| Transceivers | None |
| PCI Express | None |
| Analog / monitor | None |
| Design tool | Lattice iCEcube2 |
Packages
| Package | Size (mm) | Pitch (mm) | User I/O | Transceivers |
|---|---|---|---|---|
| WLCSP25 | 1.71 × 1.71 | 0.35 | 20 | — |
| ucBGA36 | 2.5 × 2.5 | 0.4 | 30 | — |
| ucBGA49 | 3 × 3 | 0.4 | 39 | — |
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 iCE40LM4K
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 |
|---|---|---|---|---|---|---|---|
| GW1N-2Gowin LittleBee | 2.3K 2.3K LUT4 | — | — | 0.1 Mb | 125 | — | — |
| GW1NZ-2Gowin LittleBee | 2.3K 2.3K LUT4 | — | — | 0.1 Mb | 125 | — | — |
| GW1NR-2Gowin LittleBee | 2.3K 2.3K LUT4 | — | — | 0.1 Mb | 126 | — | — |
| GW3AT-6Gowin Arora III | 6.9K 6.9K LUT4 | — | — | 0.3 Mb | 70 | 1 SERDES 8.5 Gb/s | — |
| LFMXO4D-040Lattice MachXO4 | 3K 3K LUT4 | 3.6K LC | — | 0.1 Mb | 204 | — | — |
| GW1AN-3Gowin Arora | 3.2K 3.2K LUT4 | — | — | 0.1 Mb | 208 | — | — |
Compare side by side: iCE40LM4K vs GW1N-2, iCE40LM4K vs GW1NZ-2, iCE40LM4K vs GW1NR-2.
iCE40LM4K quick facts
How many LUTs does the iCE40LM4K have?
The iCE40LM4K has 3,520 LUT4 look-up tables, about 3,520 LUT4 equivalents.
How many DSP blocks does the iCE40LM4K have?
The iCE40LM4K has no 16×16 MAC blocks and 0.1 Mb of block RAM.
Does the iCE40LM4K have transceivers?
No, the iCE40LM4K has no multi-gigabit transceivers. Its user I/O supports up to 39 pins.
What are the alternatives to the iCE40LM4K?
Devices of similar size in other families include GW1N-2 (Gowin LittleBee), GW1NZ-2 (Gowin LittleBee), GW1NR-2 (Gowin LittleBee).
Which software is used to design with the iCE40LM4K?
Designs for the iCE40LM4K are built with Lattice iCEcube2.
Other iCE40 LP/HX/LM devices
| Device | LUT4-eq. | Vendor logic | DSP | Block RAM | Max I/O | Transceivers | PCIe |
|---|---|---|---|---|---|---|---|
| iCE40LP384 | 384 384 LUT4 | 384 LC | — | — | 39 | — | — |
| iCE40LP640 | 640 640 LUT4 | 640 LC | — | 0 Mb | 10 | — | — |
| iCE40LM1K | 1.1K 1.1K LUT4 | 1.1K LC | — | 0.1 Mb | 39 | — | — |
| iCE40LP1K | 1.3K 1.3K LUT4 | 1.3K LC | — | 0.1 Mb | 97 | — | — |
| iCE40HX1K | 1.3K 1.3K LUT4 | 1.3K LC | — | 0.1 Mb | 98 | — | — |
| iCE40LM2K | 2K 2K LUT4 | 2K LC | — | 0.1 Mb | 39 | — | — |
| iCE40LP4K | 3.5K 3.5K LUT4 | 3.5K LC | — | 0.1 Mb | 180 | — | — |
| iCE40HX4K | 3.5K 3.5K LUT4 | 3.5K LC | — | 0.1 Mb | 109 | — | — |
| iCE40LM4K | 3.5K 3.5K LUT4 | 3.5K LC | — | 0.1 Mb | 39 | — | — |
| iCE40LP8K | 7.7K 7.7K LUT4 | 7.7K LC | — | 0.1 Mb | 180 | — | — |
| iCE40HX8K | 7.7K 7.7K LUT4 | 7.7K LC | — | 0.1 Mb | 208 | — | — |
Source: Lattice iCE40 LP/HX/LM 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.