# DC-DC Converter MEAN WELL DCWN03B-12 3W 18-36V 125mA

**URL:** https://aio.lv/en/product--mean-well-dcwn03b-12--10504581
**Data updated:** 2026-01-13 21:33 (EET)
**Category:** I/O Adapters & Controllers
**Manufacturer:** mean well
**Manufacturer code:** DCWN03B-12
**EAN:** 4021087046923
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 23.99 €
**Prices and availability valid until:** 2026-07-23 23:59
**Price without VAT (21%):** 19.83 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--mean-well-dcwn03b-12--10504581

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 23.07.2026 | free |
| Pickup points | 28.07.2026 | 1.89 EUR |
| Courier delivery to door | 28.07.2026 | 4.99 EUR |

## Summary description

The MEAN WELL DCWN03B-12 is a compact DC-DC converter with a power output of 3W. It operates with a DC input voltage range of 18-36V and provides an output current of 125mA. With dimensions of 20.3mm x 31.8mm x 10.2mm, it is suitable for various applications requiring efficient voltage conversion.

## Long description

The MEAN WELL DCWN03B-12 is a compact DC-DC converter delivering 3W of output power. It accepts a DC input voltage range of 18–36V and provides a regulated output current of 125mA. With small dimensions of 20.3mm × 31.8mm × 10.2mm, the module is suitable for installations with limited space where reliable voltage conversion and low-profile design are required.
Advantages
The converter offers a small footprint and light weight while maintaining stable output current and efficient power conversion. Its wide input voltage range allows flexible use with varied supply sources. Thermal behaviour and mechanical dimensions make it easy to integrate into compact electronic assemblies without significant redesign of enclosures or mechanical supports.
Suitable for
 Embedded systems and single-board computers requiring a stable auxiliary supply
 Industrial control panels and sensors with limited space for power modules
 Telecommunications equipment and interface modules needing isolated or regulated outputs
 Battery-powered or vehicle applications operating within the input voltage range
Key specifications
 Output power: 3 W
 Input voltage range: 18–36 V DC
 Output current: 125 mA
 Package dimensions: 20.3 mm × 31.8 mm × 10.2 mm
 Typical conversion type: DC-DC step-down/isolation as applicable to module design
How to use
Install the DC-DC converter on a stable surface or PCB according to the mechanical dimensions. Connect the input to a DC supply within the specified 18–36 V range, observing correct polarity. Connect the output to the load that requires the regulated current or voltage provided by the module. Ensure adequate cooling or airflow when the module is used near its power limits and verify connections before applying power to avoid damage to the converter or connected equipment.
Usage recommendations
For reliable operation, keep the module within its rated input range and avoid extended operation at maximum ambient temperature. Provide at least minimal spacing around the module for heat dissipation, and use proper decoupling or filtering on input and output lines if the application is sensitive to electrical noise.

## Specifications

| Feature | Value |
|---|---|
| Power | 3 W |
| On/off switch | No |
| Output current | 125 mA |
| DC input voltage | 18 - 36 |
| USB connectivity | No |

### Operational conditions

| Feature | Value |
|---|---|
| Operating temperature (T-T) | -40 - 90 |

### Ports & interfaces

| Feature | Value |
|---|---|

### Other features

| Feature | Value |
|---|---|
| Type | DC/DC |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 0.0125 kg |
| Height | 10.2 mm |
| Width | 20.3 mm |
| Depth | 31.8 mm |

### Power

| Feature | Value |
|---|---|
| Output voltage | -12 - 2 |

### Design

| Feature | Value |
|---|---|
| Product colour | Black |

### Performance

| Feature | Value |
|---|---|
| Certification | RoHS, EN55032, CE, EAC |

### Logistics data

| Feature | Value |
|---|---|
| Country of origin | China |

## FAQ

### How much does the DC-DC Converter MEAN WELL DCWN03B-12 cost, and is it available for purchase?

The price is 23.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 2 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 23.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All mean well products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized mean well service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

### How can I tell if this product suits my needs?

When making a choice, we recommend paying attention to the key features: weight, product colour, compatibility with your devices or usage conditions, material quality, functionality, and warranty terms. These characteristics will help you determine how well the model meets your needs.

### Where can I download the instructions for DC-DC Converter MEAN WELL DCWN03B-12?

You can download the instructions in PDF format from the “Instructions” section on the product description page. The file contains complete information about installation, setup, and usage.

## Image

https://aio.lv/img/cache/product/10504581/64395832_large.webp