4 layers94.7 × 69.1 mm
VariometerV2.2.1
oiver12/VariometerV2
Paragliding variometer: custom KiCad PCBs, ESP32 firmware, sensor fusion, e-ink UI, and desktop flight replay.
158 partsMIT
4 layers38 × 48 mm
PCB Layout of the STDC Project
- Size
- 38 × 48 mm
- Copper layers
- 4
- Thickness
- 1.6 mm
- Parts
- 127
- Nets
- 136
- Pads
- 470
- Tracks, vias
- 836, 197
- Pours
- 35
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 17 Jun 2026
- Updated
- 17 Jun 2026
Overview
STDC is an open-source printed circuit board by SebastianThomas, from the SebastianThomas/STDC-PCB repository on GitHub. It is a 4-layer board of 38 × 48 mm with 127 parts on 136 nets, routed with 836 tracks and 197 vias.
It is built around the SN74LV1T34DCK, PAM2306AYPKE and R1200N001A-TR-FE, with the W25Q32JWSNIQ, TPS22916CNYFPR and BQ51050BRHLR among its other parts. Its parts include 57 capacitors, 30 resistors, 19 ICs, 6 diodes and 4 inductors. It belongs with the STM32 boards of this library.
Main components
12
SN74LV1T34DCK
SC-70-5-40℃~+125℃ 1 1 1.6V~5.5V 10uA 5.5ns@5V,15pF 74LV 8mA 8mA Level shifting Push-pull Unidirectional SC-70-5 Buffers, Drivers, Receivers, Transceivers ROHSTexas InstrumentsBuffers / Drivers
PAM2306AYPKE
WDFN-12L-EP(3x3)-40℃~+85℃ 1.5MHz 1A 2 2.5V~5.5V 40uA Adjustable Buck Buck Built-in Yes WDFN-12L-EP(3x3) DC-DC Converters ROHSDiodes IncorporatedDC-DC Converters
R1200N001A-TR-FE
SOT-23-6-40℃~+85℃ 1 1.2MHz 17V 2.3V~5.5V 500uA 700mA Adjustable Boost Boost Built-in No SOT-23-6 DC-DC Converters ROHSNisshinbo Micro Devices Inc.DC-DC Converters
W25Q32JWSNIQ
SOIC-8SOIC-8 NOR FLASH ROHSWinbond ElecNOR FLASH
TPS22916CNYFPR
DSBGA-4(0.7x0.7)-40℃~+85℃ 1 1V~5.5V 2A 60mΩ Active High Load Switch DSBGA-4(0.7x0.7) Power Distribution Switches ROHSTexas InstrumentsPower Distribution Switches
BQ51050BRHLR
QFN-20-EP(3.7x4.7)0℃~+125℃ 1.5A 3uA 4.2V 4V~10V Charging IC Lithium Battery Support QFN-20-EP(3.7x4.7) Battery Management ROHSTexas InstrumentsBattery ManagementDW01A
SOT-23-6L-40℃~+85℃ 1 2.5V 300mV~10V 3uA 4.3V Protection IC Support SOT-23-6L Battery Management ROHSPUOLOPBattery ManagementMS5849-30BA
BGA-8_3.3x3.3mmUncategorisedTE Connectivity
PCA9306D
SO-8-40℃~+105℃ 1 1.8V~5.5V 1V~3.6V 2 2Mbps Automatic direction detection、Output enable high-impedance Bidirectional Level translator Open-drain SMBus、I2C SO-8 Translators, Level Shifters ROHSNXP SemiconductorsTranslators, Level Shifters
AO3400A
SOT-23-55℃~+150℃ 1 N-channel 1.45V 1.4W 30V 48mΩ@2.5V 5.7A 50pF 630pF 75pF 7nC@10V N-Channel SOT-23 MOSFETs ROHSAlpha & Omega SemiconductorMOSFETs
RB522ES-30T15R
SMD06031 Independent 100mA 30V 370mV@10mA 500mA 7uA@10V SMD0603 Schottky Diodes ROHSROHM SemiconductorSchottky DiodesQ13FC1350000400
SMD3215-2PSMD3215-2P Crystals ROHSSeiko EpsonCrystals
Parts
127| Qty | Value | Footprint | References |
|---|---|---|---|
| 25 | 100n | Capacitor_SMD:C_0402_1005Metric | C5, C11, C12, C13, C14, C36, C37, C40, C41, C42, C46, C47, C48, C49, C50, C51 +9 |
| 11 | 10k | Resistor_SMD:R_0402_1005Metric | R1, R2, R5, R17, R18, R24, R25, R26, R28, R29, R30 |
| 7 | 4u7 | Capacitor_SMD:C_0402_1005Metric | C1, C2, C15, C28, C29, C44, C45 |
| 6 | 10u | Capacitor_SMD:C_0402_1005Metric | C25, C26, C30, C31, C35, C39 |
| 5 | 2k2 | Resistor_SMD:R_0402_1005Metric | R9, R20, R21, R22, R23 |
| 5 | SN74LV1T34DCK | Package_TO_SOT_SMD:SOT-353_SC-70-5 | U7, U8, U10, U11, U14 |
| 4 | 1u | Capacitor_SMD:C_0402_1005Metric | C3, C33, C38, C43 |
| 3 | 100p | Capacitor_SMD:C_0402_1005Metric | C21, C27, C32 |
| 3 | 10n | Capacitor_SMD:C_0402_1005Metric | C4, C18, C22 |
| 3 | 150R | Resistor_SMD:R_0402_1005Metric | R3, R7, R11 |
| 3 | 680R | Resistor_SMD:R_0402_1005Metric | R6, R10, R27 |
| 2 | 15pF | Capacitor_SMD:C_0402_1005Metric | C9, C10 |
| 2 | 22n | Capacitor_SMD:C_0402_1005Metric | C17, C23 |
| 2 | 470n | Capacitor_SMD:C_0402_1005Metric | C16, C24 |
| 2 | AO3400A | Package_TO_SOT_SMD:SOT-23 | Q1, Q2 |
| 2 | RB522ES-30T15R | RB522ES-30T15R:RB522ES30 | D4, D5 |
| 2 | TPS22916CNYFPR | TPS22916CNYFPR:BGA4C40P2X2_78X78X50 | IC1, IC2 |
| 2 | TestPoint | TestPoint:TestPoint_THTPad_1.0x1.0mm_Drill0.5mm | TP1, TP4 |
| 1 | 100k | Resistor_SMD:R_0402_1005Metric | R12 |
| 1 | 10u | Inductor_SMD:L_1812_4532Metric | L4 |
| 1 | 15k | Resistor_SMD:R_0402_1005Metric | R15 |
| 1 | 1M5 | Resistor_SMD:R_0402_1005Metric | R19 |
| 1 | 1k | Resistor_SMD:R_0402_1005Metric | R4 |
| 1 | 200k | Resistor_SMD:R_0402_1005Metric | R13 |
| 1 | 220R | Resistor_SMD:R_0402_1005Metric | R8 |
| 1 | 220k | Resistor_SMD:R_0402_1005Metric | R14 |
| 1 | 220n | Capacitor_SMD:C_0402_1005Metric | C19 |
| 1 | 22u | Capacitor_SMD:C_0402_1005Metric | C34 |
| 1 | 2n2 | Capacitor_SMD:C_0402_1005Metric | C20 |
| 1 | 2u2 | Inductor_SMD:L_1210_3225Metric | L3 |
| 1 | 49.9R | Resistor_SMD:R_0402_1005Metric | R16 |
| 1 | 4u7 | Inductor_SMD:L_1210_3225Metric | L2 |
| 1 | BQ51050BRHL | Package_DFN_QFN:Texas_VQFN-RHL-20 | U4 |
| 1 | Blue | LED_SMD:LED_0603_1608Metric | D3 |
| 1 | DW01A | Package_TO_SOT_SMD:SOT-23-6 | U2 |
| 1 | FH34SRJ-34S-0.5SH_50_ | FCC FPC 34Pin:FH34SRJ34S05SH50 | J3 |
| 1 | Green | LED_SMD:LED_0603_1608Metric | D6 |
| 1 | LM810 | Package_TO_SOT_SMD:SOT-23 | U13 |
| 1 | LOGO | images:eth_logo_neg | G*** |
| 1 | MAX17262REWL_T | MAX17262REWL_T:BGA9N40P3X3_144X146X69N | U3 |
| 1 | MCP1700x-250xxTT | Package_TO_SOT_SMD:SOT-23 | U6 |
| 1 | MS5849-30BA | MS5849-30BA:MS584930BA | IC4 |
| 1 | Orange | LED_SMD:LED_0603_1608Metric | D1 |
| 1 | PAM2306AYPKE | Package_DFN_QFN:WDFN-12-1EP_3x3mm_P0.45mm_EP1.7x2.5mm | U5 |
| 1 | PCA9306 | Package_SON:X2SON-8_1.4x1mm_P0.35mm | U9 |
| 1 | Q13FC1350000400 | Crystal:Crystal_SMD_3215-2Pin_3.2x1.5mm | X1 |
| 1 | R1200N001A-TR-FE | LIB_R1200N001A-TR-FE:SOT95P280X110-6N | IC3 |
| 1 | RN4871 | RF_Module:Microchip_RN4871 | U12 |
| 1 | Red | LED_SMD:LED_0603_1608Metric | D2 |
| 1 | S3B-PH-SM4-TB_LF__SN_ | JST PH S3B Connector:JST_S3B-PH-SM4-TB_LF__SN_ | J2 |
| 1 | STM32L476RGTx | Package_QFP:LQFP-64_10x10mm_P0.5mm | U1 |
| 1 | TC2030 | Connector:Tag-Connect_TC2030-IDC-NL_2x03_P1.27mm_Vertical | J1 |
| 1 | UART_RX | TestPoint:TestPoint_THTPad_1.0x1.0mm_Drill0.5mm | TP3 |
| 1 | UART_TX | TestPoint:TestPoint_THTPad_1.0x1.0mm_Drill0.5mm | TP2 |
| 1 | W25Q32JWSNIQ | Winbond-W25Q32JWSNIQ:SOIC127P600X175-8N | IC5 |
| 1 | WPC Charging RX | L_IWAS4832-QiCoil:L_IWAS4832ABEB110JF1 | L1 |
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Questions
How big is the STDC PCB?
It measures 38 × 48 mm and has 4 copper layers, 1.6 mm thick.
What parts does the STDC use?
127 parts, built around the SN74LV1T34DCK, PAM2306AYPKE, R1200N001A-TR-FE and W25Q32JWSNIQ. 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 STDC KiCad files?
From the SebastianThomas/STDC-PCB repository on GitHub, at the commit this page was made from: the board is STDC.kicad_pcb and its schematic STDC.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the STDC design in my own project?
Its repository states no licence, so its author keeps all rights: ask SebastianThomas before reusing the design.