2 layers290.1 × 130 mm
2 layers20.4 × 17.8 mm
5V to 3.3V LDO
a0405chain3x10/3.3V-Linear-Power-Module1- Size
- 20.4 × 17.8 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 9
- Nets
- 4
- Pads
- 20
- Tracks, vias
- 33, 3
- Pours
- 1
- Routed
- Yes
- KiCad
- KiCad 10.0 (file 20260206)
- Created
- 16 Sep 2026
- Updated
- 23 Sep 2026
Overview
5V to 3.3V LDO is an open-source printed circuit board by a0405chain3x10, from the a0405chain3x10/3.3V-Linear-Power-Module repository on GitHub. It is a 2-layer board of 20.4 × 17.8 mm with 9 parts on 4 nets, routed with 33 tracks and 3 vias.
It is built around the AMS1117-3.3. Its parts include 4 capacitors, 2 connectors, 1 resistor, 1 IC and 1 diode.
Main components
1README
Readme.md3.3V Linear Power Delivery Module
Overview
This repository contains the KiCad design files for a custom 5V to 3.3V power delivery network. Built around the AMS1117-3.3 Low-Dropout (LDO) regulator, this module is designed to provide stable, filtered power for mixed-signal microcontrollers by implementing both high-frequency and bulk decoupling strategies.
Visuals
(Note: Ensure image files are uploaded to the root of the repository so these links render correctly)
Design Highlights
- Dual-Stage Decoupling: Utilizes a 100µF bulk capacitor for instantaneous current spikes and a 0.1µF bypass capacitor for high-frequency noise filtration on both the input and output rails.
- Thermal Management: The LDO tab is coupled to a solid copper ground plane on the PCB to act as a thermal heatsink during high-current draw.
- Trace Routing: Calculated trace widths used for the +5V and 3V3 nets to safely handle required current without excessive voltage drop.
Bill of Materials (BOM)
| Ref | Qty | Component Details | Package | Source Link |
|---|---|---|---|---|
| C1, C3 | 2 | 0.1µF, 50V MLCC (KEMET C0805C104K5RAC7210) | SMD 0805 | Robu.in |
| C2, C4 | 2 | 100µF, 6.3V MLCC (MURATA 21BR60J107ME15K) | SMD 0805 | Robu.in |
| D1 | 1 | 5mm Red DIP LED | THT 5.0mm | Robu.in |
| J1, J2 | 2 | 2.54mm Pitch Male Header (Breakable) | THT 2.54mm | Robu.in |
| R1 | 1 | 68Ω, 125mW Resistor (Yageo RC0805JR-0768RL) | SMD 0805 | Robu.in |
| U1 | 1 | AMS1117-3.3V 1A LDO Voltage Regulator | SMD SOT-223 | Robu.in |
Fabrication Specs
- Layers: 2 (Front Cu, Back Cu)
- Design Rule Check (DRC): 0 Violations
- EDA Tool: KiCad 10.0
Parts
9| Qty | Value | Footprint | References |
|---|---|---|---|
| 2 | 0.1uF | Capacitor_SMD:C_0805_2012Metric | C1, C3 |
| 2 | 100uF | Capacitor_SMD:C_0805_2012Metric | C2, C4 |
| 2 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1, J2 |
| 1 | 68 | Resistor_SMD:R_0805_2012Metric | R1 |
| 1 | AMS1117-3.3 | Package_TO_SOT_SMD:SOT-223-3_TabPin2 | U1 |
| 1 | LED | LED_THT:LED_D5.0mm | D1 |
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Questions
How big is the 5V to 3.3V LDO PCB?
It measures 20.4 × 17.8 mm and has 2 copper layers, 1.6 mm thick.
What parts does the 5V to 3.3V LDO use?
9 parts, built around the AMS1117-3.3. 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 5V to 3.3V LDO KiCad files?
From the a0405chain3x10/3.3V-Linear-Power-Module repository on GitHub, at the commit this page was made from: the board is 5V to 3.3V LDO.kicad_pcb and its schematic 5V to 3.3V LDO.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the 5V to 3.3V LDO design in my own project?
Its repository states no licence, so its author keeps all rights: ask a0405chain3x10 before reusing the design.