4 layers136.3 × 71.1 mm
2 layers236.1 × 74.2 mm
UT47.3
coarse/UT47.37STM32 40% keyboard based on Gnap
- Size
- 236.1 × 74.2 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 175
- Nets
- 147
- Pads
- 659
- Tracks, vias
- 1,566, 81
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 5 (file 20171130)
- Created
- 24 Feb 2019
- Updated
- 13 Mar 2019
Overview
UT47.3 is an open-source printed circuit board by coarse, from the coarse/UT47.3 repository on GitHub. It is a 2-layer board of 236.1 × 74.2 mm with 175 parts on 147 nets, routed with 1,566 tracks and 81 vias.
It is built around the LD1117AG-33-AA3-A-R, WS2812B and K2-1187SQ-A4SW-06, with the MMBT3904 among its other parts. Its parts include 55 diodes, 49 resistors, 15 capacitors, 2 ICs and 2 switches. It belongs with the keyboards and input boards and the STM32 boards of this library.
Main components
4
LD1117AG-33-AA3-A-R
SOT-223-20℃~+125℃@(Tj) 1 1.3V@(1A) 100uV 15V 1A 3.3V 5mA 75dB@(120Hz) Fixed Over Current Protection、Over Temperature Protection Positive SOT-223-4 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSUTCVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
WS2812B
5mm X 5mm Surface Mount RGB LED with Intelligent ControlWorldsemiUncategorised
K2-1187SQ-A4SW-06
SMD-4P,5.2x5.2mm-25℃~+85℃ 1.5mm 100,000 cycles 12V 2.5N 5.2mm 5.2mm 50mA Round Button SPST Surface Mount,Vertical SMD-4P,5.2x5.2mm Tactile Switches ROHSHRO ElectronicsTactile Switches
MMBT3904
SOT-23-55℃~+150℃ 1 NPN 100 100nA 200mA 200mW 300MHz 300mV 40V 6V NPN SOT-23 Bipolar (BJT) ROHSJiangsu Changjing Electronics Technology (CJ)Bipolar (BJT)
README
README.mdUT47.3
STM32 40% Keyboard PCB
Keyboard Layout Editor layout: Layout
Made with permission from KeyHive.
The design is inspired by 40percent.club's Gnap keyboard, which is licensed under CC BY-SA 4.0.
Notes
At the moment, UT 47.3 is not compatible with most UT47.2 and UT47 cases. A number of differences from the two other PCBs are as follow:
- USB port location
- UT47.3's USB port is located at the top left part of the case. UT47 and UT47.2's USB port is located at the top right part of the case. This will be fixed in another revision
- ARM Microcontroller
- Unlike UT47 and UT47.2, UT47.3 uses an ARM microcontroller instead of an AVR microcontroller. Specifically, the UT47.3 uses an STM32F072 microcontroller due to not needing an external crystal to use it as an HID keyboard device which keeps costs low.
- Reset switch location/s
- UT47.3, powered by an STM32 chip, needs two physical switches for reset and entering DFU. Because of that, the location of the switches on the UT47.3 are differnet.
- RGB underglow LED
- UT47.3 was meant to be a budget PCB therefore the number of underglow LEDs were reduced to 8.
- Single color backlight
- UT47.3 introduces a simple single-zone backlighting.
- Non-hotswap
- Because backlighting is present, using hotswap modules is not an option for this PCB.
Parts
175| Qty | Value | Footprint | References |
|---|---|---|---|
| 47 | 470 | Resistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolder | R2, R10, R11, R12, R13, R14, R15, R16, R17, R18, R19, R20, R21, R22, R23, R24 +31 |
| 47 | D | Diode_SMD:D_SOD-123 | D1, D2, D10, D11, D12, D13, D14, D15, D16, D17, D18, D19, D20, D21, D22, D23 +31 |
| 40 | MX-1U | MX_Alps_Hybrid:MXOnly-1U | MX1, MX2, MX10, MX11, MX14, MX15, MX16, MX17, MX18, MX19, MX20, MX21, MX22, MX23, MX26, MX27 +24 |
| 9 | 100nF | Capacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolder | C2, C3, C4, C7, C9, C11, C13, C14, C15 |
| 8 | WS2812B | led:WS2812B | LED1, LED2, LED3, LED4, LED5, LED6, LED7, LED8 |
| 4 | 4.7uF | Capacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolder | C1, C8, C10, C12 |
| 4 | MX-1.25U | MX_Alps_Hybrid:MXOnly-1.25U | MX13, MX24, MX41, MX43 |
| 2 | 10k | Resistor_SMD:R_0603_1608Metric_Pad1.05x0.95mm_HandSolder | R1, R49 |
| 2 | 10uF | Capacitor_SMD:C_0603_1608Metric_Pad1.05x0.95mm_HandSolder | C5, C6 |
| 2 | K2-1187SQ-A4SW-06 | tact_switches:K2-1187SQ-A4SW-06 | SW1, SW2 |
| 2 | LOGO | silkscreen:pb-logo | G***, G*** |
| 2 | MX-1.5U | MX_Alps_Hybrid:MXOnly-1.5U | MX12, MX25 |
| 1 | LD1117AG-33-AA3-A-R | Package_TO_SOT_SMD:SOT-223 | U1 |
| 1 | MMBT3904 | Package_TO_SOT_SMD:SOT-23 | Q1 |
| 1 | MX-2U | MX_Alps_Hybrid:MXOnly-2U-ReversedStabilizers | MX42 |
| 1 | STM32F072CBTx | Package_QFP:LQFP-48_7x7mm_P0.5mm | U2 |
| 1 | USB_mini_micro_B | usb_mini:USB-Mini-B_ LCSC-C46398 | USB1 |
The 174 most common of 175 parts.
Questions
How big is the UT47.3 PCB?
It measures 236.1 × 74.2 mm and has 2 copper layers, 1.6 mm thick.
What parts does the UT47.3 use?
175 parts, built around the LD1117AG-33-AA3-A-R, WS2812B, K2-1187SQ-A4SW-06 and MMBT3904. 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 UT47.3 KiCad files?
From the coarse/UT47.3 repository on GitHub, at the commit this page was made from: the board is ut47.3.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the UT47.3 design in my own project?
Its repository states no licence, so its author keeps all rights: ask coarse before reusing the design.
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