4 layers85.7 × 58.6 mm
4 layers144.3 × 143.8 mm
Cheep boards
esl-epfl/HEEPidermis12- Size
- 144.3 × 143.8 mm
- Copper layers
- 4
- Thickness
- 1.61 mm
- Parts
- 278
- Nets
- 301
- Pads
- 1,293
- Tracks, vias
- 4,201, 1,858
- Pours
- 9
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 25 Aug 2025
- Updated
- 2 Nov 2026
Overview
Cheep boards is an open-source printed circuit board by esl-epfl, from the esl-epfl/HEEPidermis repository on GitHub. It is a 4-layer board of 144.3 × 143.8 mm with 278 parts on 301 nets, routed with 4,201 tracks and 1,858 vias.
It is built around the 74AHC244D, TCA9548ARGER and MAX17577ATC+, with the W25Q128JVSIQ, SN74AXC4T774RSVR and TS5A23159DGSR among its other parts. Its parts include 115 resistors, 58 capacitors, 30 ICs, 26 diodes and 9 connectors.
Main components
12
74AHC244D
SO-20-300mil-40℃~+125℃ 10.5ns@5V,50pF 2V~5.5V 74AHC 8 80uA 8mA 8mA Schmitt trigger Tri-State SO-20-300mil Buffers, Drivers, Receivers, Transceivers ROHSNexperiaBuffer/Driver/Transceiver
TCA9548ARGER
VQFN-24-EP(4x4)-40℃~+125℃ 1.65V~5.5V 2uA 400Kbps 80uA I2C、SMBus VQFN-24-EP(4x4) Interface - Specialized ROHSTexas InstrumentsInterface - Specialized
MAX17577ATC+
SON-12-EP(3x3)-40℃~+125℃ 1 1A 400kHz~2.2MHz 900mV~36V Adjustable Built-in Inverting Yes SON-12-EP(3x3) DC-DC Converters ROHSMaxim Integrated (Analog Devices)DC-DC Converters
W25Q128JVSIQ
SOIC-8-208mil-40℃~+85℃ 100,000 cycles 120ms@(32KB) 128Mbit 133MHz 1uA 2.7V~3.6V 20 Years 3ms Power-on reset、Hardware write protection、Software write protection、Write enable latch、Absolute write protection SPI SOIC-8-208mil NOR FLASH ROHSWinbondNOR FLASH
SN74AXC4T774RSVR
UQFN-16(1.8x2.6)-40℃~+125℃ 1 310Mbps 4 650mV~3.6V 650mV~3.6V Bidirectional Tri-State UQFN-16(1.8x2.6) Translators, Level Shifters ROHSTexas InstrumentsTranslators, Level Shifters
TS5A23159DGSR
VSSOP-10-0.5mm-40℃~+85℃ 1.1Ω 1.65V~5.5V 100MHz 15ns 2 20ns 2:1 VSSOP-10-0.5mm Analog Switches, Multiplexers ROHSTexas InstrumentsAnalog Switches, Multiplexers
74AHCT1G08SE
SOT-353-40℃~+125℃ 1 100mV、550mV 2 2V 3.94V、4.4V~4.5V 4.5V~5.5V 40uA 7.9ns@5V,50pF 74AHCT Series 800mV 8mA 8mA AND Gate Push-pull Schmitt trigger SOT-353 Logic Gates ROHSDiodes IncorporatedLogic Gates
TCAL6416PW
TSSOP-24I/O ExpandersTexas Instruments
TLV75801PDBV
SOT-23-5-40℃~+125℃@(Tj) 1 130mV@(500mA) 25uA 30uVrms 500mA 50dB@(1kHz) 550mV~5.5V 6V Adjustable Positive Under Voltage Lockout、Soft Start、Short Circuit Protection、Thermal Shutdown SOT-23-5 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSTexas InstrumentsVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
TXB0304RUT
QFN124-bit Bidirectional Auto-direction Sensing Translator with Fully Symmetric 0.9V to 3.6V RangeTexas InstrumentsUncategorised74AHC1G04SE
SOT-353-40℃~+125℃ 1 1 1.5V~3.85V 1.9V、2.9V、4.4V 1uA 2V~5.5V 500mV~1.65V 7.5ns@5V,50pF 74AHC 8mA 8mA Noise suppression function Schmitt trigger SOT-353 Inverters ROHSDiodes IncorporatedInverters
FT4232HL
QFP64Quad High Speed USB to Multipurpose UART/MPSSE ICFTDIUncategorised
README
hw/vendor/breakout-board/README.mdParts
278| Qty | Value | Footprint | References |
|---|---|---|---|
| 53 | 10k | Resistor_SMD:R_0603_1608Metric | R1, R12, R13, R24, R25, R100, R101, R102, R103, R104, R105, R106, R107, R108, R109, R110 +37 |
| 38 | 100nF | Capacitor_SMD:C_0603_1608Metric | C1, C2, C10, C11, C12, C13, C14, C15, C16, C18, C21, C24, C26, C27, C28, C29 +22 |
| 28 | 1k | Resistor_SMD:R_0603_1608Metric | R10, R11, R14, R15, R16, R17, R18, R19, R20, R111, R112, R113, R114, R115, R116, R117 +12 |
| 24 | LED | LED_SMD:LED_0603_1608Metric | D1, D2, D10, D11, D12, D15, D16, D17, D18, D19, D20, D21, D22, D23, D24, D25 +8 |
| 12 | ~ | heep_footprints:chewing-gum | CG1, CG2, CG3, CG4, CG5, CG6, CG7, CG8, CG9, CG10, CG11, CG12 |
| 8 | 5029 | TestPoint:TestPoint_Keystone_5019_Miniature | TP7, TP8, TP9, TP10, TP11, TP12, TP13, TP14 |
| 6 | 23.7k | Resistor_SMD:R_0603_1608Metric | R6, R7, R8, R9, R57, R59 |
| 6 | ~ | TestPoint:TestPoint_Loop_D1.80mm_Drill1.0mm_Beaded | TP1, TP2, TP3, TP4, TP5, TP6 |
| 5 | SW_Push | Button_Switch_SMD:SW_Push_1P1T_NO_CK_KMR2 | SW1, SW4, SW5, SW6, SW7 |
| 4 | 25 | Resistor_SMD:R_0603_1608Metric | R4, R5, R70, R71 |
| 4 | 4.7uF | Capacitor_SMD:C_0603_1608Metric | C8, C9, C41, C42 |
| 4 | 5.1k | Resistor_SMD:R_0603_1608Metric | R43, R44, R58, R60 |
| 3 | 1uF | Capacitor_SMD:C_0603_1608Metric | C17, C19, C60 |
| 3 | 20k | Resistor_SMD:R_0603_1608Metric | R47, R62, R69 |
| 3 | 22uF | Capacitor_SMD:C_0603_1608Metric | C22, C30, C44 |
| 3 | 2k | Resistor_SMD:R_0603_1608Metric | R28, R29, R78 |
| 3 | SN74AXC4T774RSVR | heep_footprints:TI-UQFN-16 | IC2, IC3, IC10 |
| 3 | TS5A23159DGS | Package_SO:VSSOP-10_3x3mm_P0.5mm | U8, U14, U28 |
| 2 | 1.5k | Resistor_SMD:R_0603_1608Metric | R54, R55 |
| 2 | 100k | Resistor_SMD:R_0603_1608Metric | R46, R61 |
| 2 | 10uF | Capacitor_SMD:C_0603_1608Metric | C20, C43 |
| 2 | 1pF | Capacitor_SMD:C_0603_1608Metric | C23, C25 |
| 2 | 30pF | Capacitor_SMD:C_0603_1608Metric | C3, C4 |
| 2 | 600nH | Inductor_SMD:L_0603_1608Metric | L1, L2 |
| 2 | 74AHC244 | Package_SO:TSSOP-20_4.4x6.5mm_P0.65mm | U11, U17 |
| 2 | 74AHCT1G08 | Package_TO_SOT_SMD:SOT-23-5 | U18, U19 |
| 2 | BIWIN_DTS04GE_SMD | heep_footprints:BIWIN_DTS04GE_SMD | U15, U16 |
| 2 | Conn_01x01_Socket | Connector:Banana_Jack_1Pin | J2, J66 |
| 2 | PESD3V3U1UL | Diode_SMD:D_SOD-882 | D13, D14 |
| 2 | TCA9548ARGER | Package_DFN_QFN:Texas_RGE0024C_VQFN-24-1EP_4x4mm_P0.5mm_EP2.1x2.1mm | U21, U22 |
| 2 | TCAL6416 | Package_DFN_QFN:WQFN-24-1EP_4x4mm_P0.5mm_EP2.6x2.6mm | U6, U7 |
| 2 | TLV75801PDBV | Package_TO_SOT_SMD:SOT-23-5 | U3, U5 |
| 2 | TXB0304RUT | Package_DFN_QFN:Texas_R-PUQFN-N12 | U25, U26 |
| 1 | 1.33M | Resistor_SMD:R_0603_1608Metric | R52 |
| 1 | 100uF | Capacitor_SMD:CP_Elec_5x4.5 | C61 |
| 1 | 10uH | Inductor_SMD:L_Vishay_IHLP-2020 | L3 |
| 1 | 12k 1% | Resistor_SMD:R_0603_1608Metric | R2 |
| 1 | 2.2uF | Capacitor_SMD:C_0603_1608Metric | C39 |
| 1 | 226k | Resistor_SMD:R_0603_1608Metric | R49 |
| 1 | 24AA02E-OT | Package_TO_SOT_SMD:SOT-23-5 | U12 |
| 1 | 3.32M | Resistor_SMD:R_0603_1608Metric | R51 |
| 1 | 3.3uF | Capacitor_SMD:C_0603_1608Metric | C6 |
| 1 | 4.7k | Resistor_SMD:R_0603_1608Metric | R64 |
| 1 | 44.2k | Resistor_SMD:R_0603_1608Metric | R67 |
| 1 | 49.9k | Resistor_SMD:R_0603_1608Metric | R50 |
| 1 | 5.6nF | Capacitor_SMD:C_0603_1608Metric | C40 |
| 1 | 500k | Potentiometer_THT:Potentiometer_Bourns_3296W_Vertical | RV1 |
| 1 | 51k | Resistor_SMD:R_0603_1608Metric | R48 |
| 1 | 59k | Resistor_SMD:R_0603_1608Metric | R56 |
| 1 | 74AHC1G04 | Package_TO_SOT_SMD:SOT-23-5 | U20 |
| 1 | 74AHCT1G08 | Package_TO_SOT_SMD:SOT-353_SC-70-5 | U9 |
| 1 | 86.6k | Resistor_SMD:R_0603_1608Metric | R68 |
| 1 | Barrel Jack | Connector_BarrelJack:BarrelJack_GCT_DCJ200-10-A_Horizontal | J47 |
| 1 | Conn_01x03 | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical_SMD_Pin1Right | J6 |
| 1 | Conn_01x03 | Connector_PinSocket_2.54mm:PinSocket_1x03_P2.54mm_Vertical | J73 |
| 1 | Conn_01x04 | Connector_PinSocket_2.54mm:PinSocket_1x04_P2.54mm_Vertical | J3 |
| 1 | Conn_02x04_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x04_P2.54mm_Vertical_SMD | J9 |
| 1 | Conn_Boaxial | Connector_Coaxial:SMA_Amphenol_901-144_Vertical | J7 |
| 1 | Crystal_GND24 | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y1 |
| 1 | FT4232HL | Package_QFP:LQFP-64_10x10mm_P0.5mm | U1 |
| 1 | MAX17577 | heep_footprints:MAX17577-12-TDFN-EP | U4 |
| 1 | NX3225GA-25.000M-STD-CRG-2 | Crystal:Crystal_SMD_3225-4Pin_3.2x2.5mm | Y2 |
| 1 | OK322532.768KJBA4SL | Oscillator:Oscillator_SMD_SeikoEpson_SG8002CE-4Pin_3.2x2.5mm | X1 |
| 1 | SI5351A-B-GTR | Package_SO:MSOP-10-1EP_3x3mm_P0.5mm_EP1.68x1.88mm | U10 |
| 1 | TPS2121RUXR | heep_footprints:TI-VQFN-HR-12 | IC13 |
| 1 | TXBN0304RUT | Package_DFN_QFN:Texas_R-PUQFN-N12 | U24 |
| 1 | USB_C_Receptacle_USB2.0_16P | Connector_USB:USB_C_Receptacle_GCT_USB4105-xx-A_16P_TopMnt_Horizontal | J8 |
| 1 | W25Q128JVSIQ | Package_SO:SOIC-8_5.3x5.3mm_P1.27mm | U2 |
| 1 | ~ | heep_footprints:CHEEP_CONNECTOR_MAINBOARD | U23 |
The 276 most common of 278 parts.
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Questions
How big is the Cheep boards PCB?
It measures 144.3 × 143.8 mm and has 4 copper layers, 1.61 mm thick.
What parts does the Cheep boards use?
278 parts, built around the 74AHC244D, TCA9548ARGER, MAX17577ATC+ and W25Q128JVSIQ. 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 Cheep boards KiCad files?
From the esl-epfl/HEEPidermis repository on GitHub, at the commit this page was made from: the board is hw/vendor/cheep-boards/main-board/main-board.kicad_pcb and its schematic hw/vendor/breakout-board/heepidermis-bo.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Cheep boards design in my own project?
Its repository states no licence, so its author keeps all rights: ask esl-epfl before reusing the design.