| Name | PCB size (mm) |
|---|---|
| WTX | 356 × 425 |
| AT | 350 × 305 |
| Baby-AT | 330 × 216 |
| BTX | 325 × 266 |
| ATX | 305 × 244 |
| EATX (Extended) | 305 × 330 |
| LPX | 330 × 229 |
| microBTX | 264 × 267 |
| NLX | 254 × 228 |
| Ultra ATX | 244 × 367 |
| microATX | 244 × 244 |
| DTX | 244 × 203 |
| FlexATX | 229 × 191 |
| Mini-DTX | 203 × 170 |
| EBX | 203 × 146 |
| microATX (min.) | 171 × 171 |
| Mini-ITX | 170 × 170 |
| EPIC (Express) | 165 × 115 |
| ESM | 149 × 71 |
| Nano-ITX | 120 × 120 |
| COM Express | 125 × 95 |
| ESMexpress | 125 × 95 |
| ETX/XTX | 114 × 95 |
| Pico-ITX | 100 × 72 |
| PC/104 (-Plus) | 96 × 90 |
| ESMini | 95 × 55 |
| Qseven | 70 × 70 |
| mobile-ITX | 60 × 60 |
| CoreExpress | 58 × 65 |
| Type | Professional Organization |
|---|---|
| Founded | September, 2007 |
| Key people | Colin McCracken (current president) |
| Area served | Worldwide |
| Focus | Standards for small, low power computers, building blocks, and accessories[1] |
| Method | Industry Standards, Conferences, Publications |
| Members | 16 |
| Motto | Advanced modular technologies enabling compact design. |
| Website | www.sff-sig.org |
In the computer hardware world, the Small Form Factor Special Interest Group or SFF-SIG (read ess-eff-eff) is an international non-profit standards body focused on the advancement of modular technologies used in embedded and small form factor computers and controllers. It has a diverse membership mainly of computer board and component manufacturers.
SFF-SIG creates, promotes, and maintains embedded computer standards for form factors and computer buses. Examples include the governing documents and trademarks for CoreExpress©, Pico-ITXTM, Express104TM, and SUMITTM. Members use the specifications to build specialized embedded computers used in both commercial and rugged environments where applications insist on reliable control and data acquisition, for example.
Primarily focused on hardware, SFF-SIG defines new single-board computer (SBC) and computer-on-module (COM) form factors. SFF-SIG standardizes expansion connectors for the latest desktop and notebook chipset interfaces to create the building blocks required by system manufacturers to rapidly deploy their unique applications. Each specification is a free open standard by ITU-T definition.
SFF-SIG generally targets low power chipsets and processors from VIA and Intel including the Nano and Atom processors, although solutions for RISC processors are discussed in some working groups. VIA Technologies, WinSystems, and Octagon Systems were founding members of SFF-SIG in 2007.
Nearly all of the specification work leverages proven high-speed and easy-interface buses and interconnects such as PCI Express[1] , USB 2.0[2], ExpressCard [3], Low Pin Count (LPC) Bus[4], SPI / uWire[5], and I2C / SMBus[6], with adaptations for modular and extensible usage. Testing has been completed to establish operation to 5 Gigahertz. Some standards preserve the ISA Bus and legacy peripherals.