M5Stack Stamp-C3U ESP32-C3 Core Module and Mate Accessory Kit
Need a larger quantity?
Need bulk pricing?
Get a formal quotation with lead time and volume pricing.
For universities, companies, distributors, and project orders.
M5Stack Stamp-C3U ESP32-C3 Core Module and Mate Accessory Kit
Description
M5Stack Stamp-C3U is a compact ESP32-C3 core module built for small IoT devices, embedded control, and flexible prototyping. This listing includes two related variants: the bare Stamp-C3U module and the accessory-focused Stamp-C3U Mate kit. Both are built around the ESP32-C3 with 4MB Flash, 400KB SRAM, 2.4GHz Wi-Fi, USB Type-C, and a programmable RGB LED, making them practical choices for RISC-V IoT prototyping and smart device development. For teams building compact nodes, M5Stack Stamp-C3U is a strong foundation.
Features
- M5Stack Stamp-C3U provides a compact ESP32-C3 core module with 14 GPIO resources.
- The board supports SMT, DIP, and flying-lead style integration for flexible product builds.
- The Stamp-C3U module includes USB Type-C, a programmable RGB LED, reset button, and user button.
- The Stamp-C3U Mate kit adds headers, HY2.0 sockets, and installation accessories for faster breadboard or circuit integration.
- Both variants are well suited to RISC-V IoT prototyping, compact wireless nodes, and smart device development.
- For low-footprint products, M5Stack Stamp-C3U remains a practical ESP32-C3 core module choice.
Specifications
| Specification | Parameter |
|---|---|
| SoC | ESP32-C3@32-bit RISC-V Single-Core Processor, Main Frequency up to 160MHz |
| Flash | 4MB |
| SRAM | 400KB |
| ROM | 384KB |
| RTC SRAM | 8KB |
| Wi-Fi | 2.4 GHz Wi-Fi (supports 20/40MHz bandwidth, 802.11 b/g/n, up to 150Mbps) |
| Input Voltage | 5V@500mA |
| Human-Machine Interaction | Programmable Physical Button x 1, Reset/Debug Button x 1, Programmable RGB LED (SK6812) x 1 |
| USB Interface | USB Type-C x 1 |
| Antenna Type | 2.4G 3D Antenna |
| Module Peripheral Interface Resources | ADC, GPIO, SPI, UART, I2C, I2S, PWM, RMT, DMA, USB Serial, TWAI |
| IO Interfaces x14 | G0, G1, G3, G4, G5, G6, G7, G8, G9, G10, G18, G19, G21, G22 |
| IO Interface Pitch | 2.54mm |
| Mounting Screw Specification | M2 x 4 Countersunk Hex Socket Machine Screw |
| Product Size | 34.0 x 20.0 x 4.6mm |
| Product Weight | 3.5g |
| Package Size | 138.0 x 93.0 x 5.6mm |
| Gross Weight | 9.8g |
Applications
M5Stack Stamp-C3U is useful for compact wireless controllers, custom sensors, and low-footprint ESP32-C3 core module designs. The bare Stamp-C3U module is better when space and direct integration matter, while the Stamp-C3U Mate kit is better for quick assembly, breakout-style work, and RISC-V IoT prototyping that needs headers and sockets from the start. Both variants support fast smart device development for compact products and custom wireless tools, and both variants keep RISC-V IoT prototyping simple for small connected builds.
Product List
- 1 × Stamp-C3U
- 1 × High-temperature Sticker
- 2 × 2.54-12P Female Header
- 2 × 2.54-10P Male Header
- 2 × HY2.0-4P Female Socket (90°)
- 1 × Hex Key L-Shape 1.5 mm (For M2 Screw)
Other Content
The pin map, size drawing, and schematic are helpful when deciding which variant is better for direct soldering, breakout wiring, or enclosure planning.




Resources
FAQ
What is the difference between Stamp-C3U and Stamp-C3U Mate?
The Stamp-C3U module is the bare minimum core board, while the Stamp-C3U Mate kit adds practical headers and sockets for easier prototyping.
What kind of projects are they good for?
Both variants are excellent for RISC-V IoT prototyping, compact wireless nodes, and smart device development built around an ESP32-C3 core module. If you need a small Wi-Fi controller, M5Stack Stamp-C3U is the more direct option, while the Stamp-C3U Mate kit is better for quick integration work.
1. General Shipping Information
- We provide reliable shipping services with a tracking number for each order.
- Shipping addresses must be entered in English and should not contain special symbols, so that the courier system can recognize your location correctly.
- Please make sure your shipping address is accurate before placing your order. We ship strictly according to the address provided at checkout.
- In-stock orders are usually dispatched within 1 business day after order confirmation.
- Estimated delivery times refer to the period after dispatch and do not include order processing time, weekends, public holidays, customs inspection, or force majeure delays.
- If you need to cancel or modify your order, please contact us before the order is marked as “Shipped”. Once shipped, the order cannot be canceled or changed.
🚀 Need Faster Shipping?
If you require expedited shipping, please contact our customer support team at info@upenelab.com for a customized quote based on your destination.
2. Shipping Rates & Options
Shipping rates are calculated based on order value, destination, and available shipping methods. The final available options will be displayed at checkout.
2.1 Germany Domestic Shipping
| Shipping Method | Order Value | Cost | Est. Delivery |
|---|---|---|---|
| Deutsche Post | €0.00 - €50.00 | €4.95 | 2-4 Business Days |
| Deutsche Post | Over €50.00 | Free | 2-4 Business Days |
|
DHL Paket (Faster Delivery) |
€0.00 - €50.00 | €6.95 | 1-3 Business Days |
|
DHL Paket (Faster Delivery) |
€50.00 - €100.00 | €2.00 | 1-3 Business Days |
|
DHL Paket (Faster Delivery) |
Over €100.00 | Free | 1-3 Business Days |
2.2 Selected EU Countries / Regions
Available EU shipping destinations are shown at checkout based on your shipping address. For orders shipped to selected EU countries or regions outside Germany, we use FedEx Regional Economy.
| Shipping Method | Order Value | Cost | Est. Delivery |
|---|---|---|---|
| FedEx Regional Economy | €0.00 - €100.00 | €7.95 | 3-5 Business Days |
| FedEx Regional Economy | Over €100.00 | Free | 3-5 Business Days |
EU orders may be fulfilled from our Munich warehouse or, when applicable, from our Shenzhen warehouse depending on inventory availability. For EU member states, OpenELAB covers applicable import duties and taxes under DDP service where required.
2.3 United States
| Region | Shipping Method | Order Value | Cost | Est. Delivery |
|---|---|---|---|---|
|
Continental U.S. (50 States) |
USPS Ground Advantage | €0.00 - €45.00 | €4.95 | 3-7 Business Days |
| USPS Ground Advantage | Over €45.00 | Free | 3-7 Business Days | |
| USPS Priority Mail | €0.00 - €45.00 | €16.95 | 1-4 Business Days | |
| USPS Priority Mail | Over €45.00 | €14.95 | 1-4 Business Days | |
|
Non-Continental U.S. (AK, HI, PR, etc.) |
USPS Ground Advantage | €0.00 - €60.00 | €6.95 | 5-9 Business Days |
| USPS Ground Advantage | Over €60.00 | Free | 5-9 Business Days |
Non-Continental U.S. regions include Alaska, American Samoa, Guam, Hawaii, the Marshall Islands, the Northern Mariana Islands, Palau, Puerto Rico, the U.S. Virgin Islands, and U.S. Armed Forces addresses.
2.4 International Destinations Outside the EU
For selected international destinations outside the EU, including Switzerland, the United Kingdom, and Norway, shipping rates are as follows:
| Order Amount | Shipping Cost |
|---|---|
| €0.00 - €300.00 | €19.95 |
| Over €300.00 | Free |
For non-EU destinations, import duties, taxes, and customs fees may be charged by the destination country and are the responsibility of the recipient.
3. Warehouses & Fulfillment
Our products may be stored in our Munich, Arlington, and Shenzhen warehouses. The actual shipping warehouse depends on product availability and destination.
3.1 Munich Warehouse
For products stored in our Munich warehouse, we use Deutsche Post or DHL Paket for domestic deliveries within Germany. For selected EU destinations outside Germany, we use FedEx Regional Economy.
3.2 Arlington Warehouse
For products stored in our Arlington warehouse, we use USPS or UPS for deliveries within the United States.
3.3 Shenzhen Warehouse
For pre-order items or products fulfilled directly from our Shenzhen warehouse, we arrange reliable international shipping based on destination and inventory status. For EU member states, OpenELAB covers applicable import duties and taxes under DDP service where required.
4. Inventory, Pre-orders & Split Shipments
- Inventory Status: Please check the product page for real-time stock information. If an item is out of stock in our local warehouses, it may be marked as “Pre-order”.
- Pre-order Fulfillment: Pre-order items may be shipped directly from Shenzhen or restocked to a local warehouse first before final delivery.
- Split Shipments: If your order contains both in-stock and pre-order items, we may ship them separately. No additional shipping fee will be charged for split shipments caused by our fulfillment arrangement.
5. Customs, Taxes & Delivery Issues
5.1 Customs and Taxes
For EU Member States:
Whether shipped from Germany or China, OpenELAB covers applicable import duties and taxes under DDP service where required. Customers in EU member states should not be charged additional import duties or VAT upon delivery.
For destinations outside the European Union, such as Switzerland, Norway, and the United Kingdom, import duties, taxes, and customs fees may be charged by local authorities upon delivery. These fees are the responsibility of the recipient.
5.2 Damaged, Delayed, or Lost Parcels
Please inspect your parcel upon delivery where possible. If you notice visible damage, please report it to the courier and contact us as soon as possible. This does not affect your statutory consumer rights.
If your parcel is delayed, lost, returned to sender, or the tracking information has not updated for an unusual period of time, please contact us at info@upenelab.com. We will assist you in checking the shipment status with the courier.
5.3 Incorrect Address or Failed Delivery
If a parcel cannot be delivered due to an incorrect or incomplete address provided by the customer, refusal of delivery, or failure to collect the parcel, additional shipping or return costs may apply.
6. VAT
For orders within the EU, VAT is collected at checkout according to the applicable destination rules. No additional VAT should be collected upon delivery for EU member state orders covered under our DDP shipping arrangement.








