# DC-DC converter TracoPower TRN 3-1212, 3 W, input 9–18 V, output 12 V 250 mA, dimensions 8×12.1×11.9 mm

**URL:** https://aio.lv/en/product--tracopower-trn-3-1212--12223935
**Data updated:** 2026-03-29 16:11 (EEST)
**Category:** I/O Adapters & Controllers
**Manufacturer:** TracoPower
**Manufacturer code:** TRN 3-1212
**EAN:** 2050005006758
**Warranty:** 2 Years
**Availability:** Out of stock

## Summary description

TracoPower TRN 3-1212 is a compact 3 W DC-DC converter with a 9–18 V DC input and a fixed 12 V output capable of 250 mA. Its small form factor (8 × 12.1 × 11.9 mm) suits embedded systems, industrial control, instrumentation and low-power electronics where stable 12 V supply and galvanic isolation or voltage conversion are required.

## Long description

TracoPower TRN 3-1212 is a compact 3 W DC-DC converter designed for applications requiring a regulated 12 V output from a 9–18 V DC input. The module delivers up to 250 mA in a cubical package measuring 8 × 12.1 × 11.9 mm, offering a small footprint suitable for embedded systems, industrial control, instrumentation and other low-power electronics. The converter belongs to the TRN 3 series which provides full regulation, wide 2:1 input range operation and reliable full-load performance up to 65°C ambient temperature.
Advantages
The TRN 3-1212 provides a stable fixed 12 V output with short-circuit protection and no minimum load requirement, which simplifies integration. Its high isolation rating (1600 VDC I/O) meets IEC/EN 62368-1 test requirements and supports galvanic isolation between input and output. The small 1 cm³ package saves board space while delivering fully regulated performance and a wide input voltage range for tolerance to supply variations.
Suitable for
Embedded systems and single-board computers with limited PCB area
Industrial control modules and automation equipment
Instrumentation, sensors and measurement devices requiring isolated 12 V
Low-power electronic devices and battery-powered systems
Key specifications
Output power: 3 W
Input voltage range: 9–18 V DC (2:1)
Output voltage: fixed 12 V DC
Output current: up to 250 mA
Isolation voltage (I/O): 1600 VDC (60 s test per IEC/EN 62368-1)
Efficiency: high performance class for 3 W converters (manufacturer specification)
Operating ambient temperature: reliable full-load operation up to 65°C
Package dimensions: 8 × 12.1 × 11.9 mm (approx. 1.00 cm³)
Protection: short-circuit and overcurrent protection
How to use
Connect the converter input to a stable DC source within the 9–18 V range, observing correct polarity. Provide adequate PCB mounting or mechanical fixation for the small cubical package to ensure reliable thermal contact and mechanical stability. The TRN 3-1212 does not require a minimum output load for regulation; however, follow the manufacturer's layout and grounding recommendations to preserve isolation and minimize noise. Ensure the output is connected only to circuits rated for a 12 V supply and limited to the 250 mA maximum output current.
Usage recommendations
Allow for sufficient clearance and thermal dissipation on the PCB when operating near the upper ambient limit (up to 65°C). Use appropriate input filtering and transient protection on the supply side if the converter is exposed to harsh or noisy environments. Verify isolation requirements in your application and test under actual operating conditions to ensure compliance with safety standards.

## Specifications

| Feature | Value |
|---|---|
| Power | 3 W |
| Output current | 250 mA |
| DC input voltage | 9-18 |

### Operational conditions

| Feature | Value |
|---|---|
| Operating relative humidity (H-H) | 0 - 95 |
| Storage temperature (T-T) | -50 - 125 |
| Operating temperature (T-T) | -40 - 85 |
| Storage relative humidity (H-H) | 0 - 95 |

### Technical details

| Feature | Value |
|---|---|
| Sustainability compliance | Yes |
| Compliance certificates | RoHS, REACH |

### Other features

| Feature | Value |
|---|---|
| Type | DC/DC |
| Material | Copper, Silicone, Nickel |
| Quantity | 1 |

### Weight & dimensions

| Feature | Value |
|---|---|
| Weight | 0.0021 kg |
| Height | 11.9 mm |
| Width | 8 mm |
| Depth | 12.1 mm |

### Power

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

### Design

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

## FAQ

### 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 TracoPower 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 TracoPower 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.

## Image

https://aio.lv/img/cache/product/12223935/68117046_large.webp