2 layers90.1 × 24 mm
SDCardInterposer
HWS-XMS/SecureSDCards
Artifacts for our work accepted at HASP2026 called "Secure SD Cards: A Threat Model and Security Analysis"
20 partsMIT
4 layers70.7 × 53.3 mm
GreatFET neighbor
HWS-XMS/SecureSDCardsArtifacts for our work accepted at HASP2026 called "Secure SD Cards: A Threat Model and Security Analysis"
- Size
- 70.7 × 53.3 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 27
- Nets
- 110
- Pads
- 223
- Tracks, vias
- 137, 10
- Pours
- 4
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 1 Oct 2026
- Updated
- 2 Oct 2026
Overview
GreatFET neighbor is an open-source printed circuit board by HWS-XMS, from the HWS-XMS/SecureSDCards repository on GitHub, published under the MIT licence. It is a 4-layer board of 70.7 × 53.3 mm with 27 parts on 110 nets, routed with 137 tracks and 10 vias.
It is built around the M24C02-FMN6TP and TPS7A2033PDBVR-TP. Its parts include 8 connectors, 5 capacitors, 2 ICs and 1 resistor.
Main components
2
M24C02-FMN6TP
SOIC-8-40℃~+85℃ 1.7V~5.5V 200 Years 2Kbit 4,000,000 Cycles 400kHz 5ms Hardware write protection function、Noise suppression function、Built-in power-on reset (POR) I2C SOIC-8 EEPROM ROHSSTMicroelectronicsEEPROM
TPS7A2033PDBVR-TP
SOT-23-5-40℃~+85℃ 1 180uV@(300mA) 2uA 3.3V 300mA 5.5V 75dB@(1kHz) Fixed Over Current Protection、Enable、Thermal Shutdown Positive SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTECH PUBLICUncategorised
README
hardware/sd-interposer/README.mdSD Card Interposer
An SD-card-form-factor interposer that taps the card bus for protocol capture. Cutting the DAT1 and DAT2 traces forces commodity readers to fall back to the single-bit SD protocol, which an affordable logic analyzer can sample.
Open SDCardInterposer.kicad_pro in KiCad. Approximate build cost: $15.
Parts
27| Qty | Value | Footprint | References |
|---|---|---|---|
| 4 | MOUNTING_HOLE | neighbor:HOLE126MIL-COPPER | MH1, MH2, MH3, MH4 |
| 3 | Conn_02x01 | Connector_PinHeader_2.54mm:PinHeader_2x01_P2.54mm_Vertical | J4, J9, J10 |
| 3 | Jumper_3_Bridged12 | neighbor:0603-JUMPER-3-BRIDGED12 | JP1, JP2, JP3 |
| 2 | 100nF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C3, C4 |
| 2 | 1uF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2, C5 |
| 2 | Conn_Coaxial | Connector_Coaxial:SMA_Amphenol_901-143_Horizontal | SMA_SHUNT_H1, SMA_SHUNT_L1 |
| 1 | 100nF | Capacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolder | C1 |
| 1 | 10k | Resistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolder | R1 |
| 1 | 4.99 | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R_SHUNT1 |
| 1 | BONUS_ROW | neighbor:HEADER-1x20 | J7 |
| 1 | Conn_02x06_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x06_P2.54mm_Vertical | J8 |
| 1 | FerriteBead | Inductor_SMD:L_0805_2012Metric_Pad1.05x1.20mm_HandSolder | FB1 |
| 1 | M24C02-FMN6TP | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U1 |
| 1 | Micro_SD_Card | Connector_Card:microSD_HC_Wuerth_693072010801 | J3 |
| 1 | NEIGHBOR1 | neighbor:HEADER-2x20 | J1 |
| 1 | NEIGHBOR2 | neighbor:HEADER-2x20 | J2 |
| 1 | TPS7A2033PDBVR | TPS7A2033PDBVR:SOT95P280X145-5N | U3 |
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Questions
How big is the GreatFET neighbor PCB?
It measures 70.7 × 53.3 mm and has 4 copper layers, 1.6 mm thick.
What parts does the GreatFET neighbor use?
27 parts, built around the M24C02-FMN6TP and TPS7A2033PDBVR-TP. 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 GreatFET neighbor KiCad files?
From the HWS-XMS/SecureSDCards repository on GitHub, at the commit this page was made from: the board is hardware/greatfet-neighbor/GreatFET-neighbor.kicad_pcb and its schematic hardware/greatfet-neighbor/GreatFET-neighbor.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the GreatFET neighbor design in my own project?
Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).