8 layers127 × 75 mm
4 layers51.6 × 62.3 mm
Socket7-cyclonev
alphaonex86/FPGA-CPUFPGA CPU x86 real socket
- Size
- 51.6 × 62.3 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 116
- Nets
- 327
- Pads
- 1,037
- Tracks, vias
- 0, 0
- Routed
- Not yet
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 18 Oct 2026
- Updated
- 7 Nov 2026
Overview
Socket7-cyclonev is an open-source printed circuit board by alphaonex86, from the alphaonex86/FPGA-CPU repository on GitHub, published under the GPL-3.0 licence. It is a 4-layer board of 51.6 × 62.3 mm with 116 parts on 327 nets.
It is built around the MT25QL01GBBB8ESF-0SIT, TLV62585PDRL and BLM18AG601SN1D, with the TLV75725PDBVR-MS among its other parts. Its parts include 88 capacitors, 19 resistors, 4 ICs, 1 connector and 1 inductor. It belongs with the FPGA and CPLD boards of this library.
Main components
4
MT25QL01GBBB8ESF-0SIT
SOIC-16-300mil-40℃~+85℃ 1.8ms 100,000 cycles 133MHz 1Gbit 2.7V~3.6V 20 Years Hardware write protection、Software write protection、Write enable latch SPI SO-16-300mil NOR FLASH ROHSMicron TechNOR FLASH
TLV62585PDRL
SOT-563-40℃~+125℃@(TJ) 1 1.5MHz 2.5V~5.5V 35uA 3A 600mV~5.5V Adjustable Buck Buck Built-in Yes SOT-563 DC-DC Converters ROHSTexas InstrumentsDC-DC Converters
BLM18AG601SN1D
0603-55℃~+125℃ 1 380mΩ 500mA 600Ω@100MHz ±25% 0603 Ferrite Beads ROHSMurataFerrite Beads
TLV75725PDBVR-MS
SOT-23-5SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSMSKSEMIUncategorised
README
sockets/kicad/README.mdSocket models (KiCad)
ZIF-socket footprints, symbols, STEP models and pin maps copied from
FPGAmotherboard. Their
generators are only in the operator's full tree, not the public repo:
socket3/tools/gen_socket3_footprint.py @a73daf8, socket7/tools/gen_socket7_*.py
@e84b442, socket370/tools/gen_pga370_*.py @57f3c94. Socket3_Am5x86_237.step
is the one regenerated in FPGAmotherboard on 2026-10-18 (the old one predated the
measured lever).
| Socket | ZIF footprint | CPU pins / holes | Pin map (source) | Symbol | ZIF body + lever |
|---|---|---|---|---|---|
| 3 | Socket3_Am5x86_237 | 168 / 241 | am5x86_pga168.csv (AMD 19751C) | none yet | photo-scaled off the operator's MB-8433UUD-A, ±0.6 mm; top face 7.3 ±0.4 mm (photo, 2026-10-31; STEP still 8.0), hole depth 5 mm (caliper) |
| 7 | Socket7_P55C_296 | 296 / 320 | socket7_p55c.csv (Intel 243185-004) | CPU_Intel_Socket7 | assumed (PGA370 envelope), not measured |
| 370 | PGA370_Socket_ZIF | 370 / 370 | pga370_coppermine.csv (Intel 245264-008) | CPU_Intel_PGA370 | Intel 244410-002 Fig. 1/2a |
Interposer base
python3 tools/gen_base.py builds, per socket, the interposer's CPU-side pins:
a Mill-Max PGA header soldered under the board (catalog in
../parts/mill-max_catalog_metric.pdf, p.140 pins, p.137 insulator).
| Socket | Footprint | 3D model (built, not in git) | Check board (base on the ZIF) | Header | Drill / pad | Board above socket |
|---|---|---|---|---|---|---|
| 3 | Interposer.pretty/Socket3_Base_PGA168 | 3dmodels/Socket3_Base_PGA168.step | socket3-base-check.kicad_pcb | 551, pin #5503 | 0.90 / 1.50 mm | 6.40 mm |
| 7 | Interposer.pretty/Socket7_Base_PGA296 | 3dmodels/Socket7_Base_PGA296.step | socket7-base-check.kicad_pcb | 550, pin #5012 | 0.80 / 1.25 mm | 3.99 mm |
| 370 | Interposer.pretty/Socket370_Base_PGA370 | 3dmodels/Socket370_Base_PGA370.step | socket370-base-check.kicad_pcb | 550, pin #5012 | 0.80 / 1.25 mm | 3.99 mm |
- Pin positions come from the ZIF footprints (socket top view = interposer top view), so the base goes unmirrored on the interposer's F.Cu; the generator fails unless they match the pin map exactly.
- Male pin 0.48 x 3.91 mm (CPU: 0.43-0.51 x 3.05-3.30 mm); tails stand 1.6 mm (551) / 2.57 mm (550) above a 1.6 mm board. F.CrtYd is the tail ring, B.CrtYd the header insulator; F.Fab shows the original CPU package.
- Footprints load their 3D models from
${KIPRJMOD}/3dmodels/; the check boards live here so that resolves. - Not measured yet (see
plan/interposers.mdM1-M3): Socket 3/7 ZIF height (the STEPs use 8.0 mm), free space around each socket, header seating depth.
Parts
116| Qty | Value | Footprint | References |
|---|---|---|---|
| 17 | 4.7nF | C_0402_P1.00 | C7, C8, C10, C11, C12, C13, C14, C15, C16, C17, C18, C19, C63, C64, C65, C66 +1 |
| 14 | 10nF | C_0402_P1.00 | C20, C21, C22, C23, C24, C25, C26, C27, C28, C67, C68, C69, C70, C80 |
| 12 | 22nF | C_0402_1005Metric | C37, C38, C39, C40, C41, C42, C43, C44, C45, C46, C47, C48 |
| 8 | 100nF | C_0402_1005Metric | C2, C53, C54, C55, C75, C76, C77, C88 |
| 8 | 10nF | C_0402_1005Metric | C29, C30, C31, C32, C33, C34, C35, C36 |
| 7 | 10k | R_0402_1005Metric | R8, R9, R10, R11, R12, R14, R15 |
| 7 | 4k7 | R_0402_1005Metric | R1, R2, R3, R4, R5, R6, R7 |
| 5 | 47nF | C_0402_1005Metric | C49, C50, C51, C52, C74 |
| 4 | 1uF | C_0402_1005Metric | C6, C59, C78, C79 |
| 3 | 2.2nF | C_0402_P1.00 | C60, C61, C62 |
| 2 | 100k | R_0402_1005Metric | R18, R19 |
| 2 | 100nF | C_0402_P1.00 | C81, C83 |
| 2 | 220nF | C_0402_1005Metric | C56, C57 |
| 2 | 22nF | C_0402_P1.00 | C71, C72 |
| 2 | 22uF/6.3V | C_0805_2012Metric | C3, C84 |
| 1 | 10uF | C_0805_2012Metric | C85 |
| 1 | 10uF/10V | C_0805_2012Metric | C5 |
| 1 | 1k | R_0402_1005Metric | R13 |
| 1 | 1nF | C_0402_1005Metric | C4 |
| 1 | 1uF | C_0402_P1.00 | C82 |
| 1 | 1uH XFL4020-102 | L_Coilcraft_XxL4020 | L1 |
| 1 | 22uF | C_0805_2012Metric | C86 |
| 1 | 22uF/10V | C_0805_2012Metric | C1 |
| 1 | 2k0 1% | R_0402_1005Metric | R16 |
| 1 | 4.7uF | C_0603_1608Metric | C87 |
| 1 | 470nF | C_0402_1005Metric | C58 |
| 1 | 47nF | C_0402_P1.00 | C73 |
| 1 | 82.5k | R_0402_1005Metric | R17 |
| 1 | BLM18AG601SN1D | L_0603_1608Metric | FB1 |
| 1 | Conn_02x03_Odd_Even | PinHeader_2x03_P2.54mm_Vertical | J1 |
| 1 | FPGA_CycloneV_5CEFA9_F484 | FPGA_CycloneV_5CEFA9_F484_BGA | U1 |
| 1 | Intel_Pentium_MMX_P55C_Socket7 | Socket7_Base_PGA296 | U2 |
| 1 | MT25QL01GBBB8ESF-0SIT | SOIC-16W_7.5x10.3mm_P1.27mm | U4 |
| 1 | TLV62585PDRL | SOT-563 | PS1 |
| 1 | TLV75725PDBVR | SOT-23-5 | PS2 |
| 1 | TPS22918DBVR | SOT-23-6 | U3 |
Questions
How big is the Socket7-cyclonev PCB?
It measures 51.6 × 62.3 mm and has 4 copper layers, 1.6 mm thick.
What parts does the Socket7-cyclonev use?
116 parts, built around the MT25QL01GBBB8ESF-0SIT, TLV62585PDRL, BLM18AG601SN1D and TLV75725PDBVR-MS. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Socket7-cyclonev KiCad files?
From the alphaonex86/FPGA-CPU repository on GitHub, at the commit this page was made from: the board is hw/socket7-cyclonev/socket7-cyclonev.kicad_pcb and its schematic hw/slot1-c2cart/slot1-c2cart.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Socket7-cyclonev design in my own project?
Its repository publishes it under the GPL-3.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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