# DC-DC Buck Converter Module 5-80V to 5V, 1.25A

> DC-DC buck converter with variable input voltage of 5-80V DC and fixed output voltage of 5V DC. Continuous current 1.25A, peak current 1.5A, efficiency above 90%, standby consumption 0.1 µA. Enable threshold 1.35V, shutdown threshold 1.1V. Aluminum substrate for heat dissipation. Dimensions 27.5 x 16mm. Suitable for powering USB devices, Arduino, ESP32, STM32.

- Page: https://sigmanortec.ro/en/dc-dc-buck-converter-module-5-80v-to-5v-125a
- Price: 15.60 RON
- Availability: Out of stock
- Reference: 88190 · EAN: 5943208582716
- Category: Electronic components > Step Down Modules
- Specifications: Source Type: descend; Current Adjustment: Not; Voltage Adjustment: Not; Adjustment Type: Fixed; Maximum Output Current: 1.25; Input Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.; Output Voltage Type: “DC” in Romanian can mean **“de ce”**, which translates to **“why”** in English.
- Updated: 2026-09-14
- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Prices: RON, VAT included; prices and stock as of 2026-10-22 04:14 (Europe/Bucharest)

## Description

DC-DC buck converter for obtaining a stable 5V supply from variable sources between 5 and 80V, ideal for USB, Arduino and control modules. It provides up to 1.25A continuous, efficiency above 90% and very low standby consumption, the aluminum substrate helps with thermal dissipation for reliable operation in industrial and automotive applications.
This DC-DC buck (step-down) converter is designed to transform a variable input voltage (5-80V) into a stable 5V output voltage, ideal for powering USB devices, microcontrollers (Arduino, ESP32, STM32), sensors, or other circuits. The aluminum substrate ensures efficient heat dissipation, allowing operation at higher currents without overheating. The module is suitable for photovoltaic systems, wind turbines, onboard power supplies, or any application requiring a stable 5V source from an input with large fluctuations.
The converter provides a continuous current of 1.25A and a peak current of 1.5A, with an efficiency of over 90%.
Specifications:
Input voltage: 5 - 80 VDC
Output voltage: 5 VDC
Continuous current: 1.25 A
Maximum peak current: 1.5 A
Efficiency: > 90%
Standby current (shutdown): 0.1 µA
Enable voltage threshold: 1.35V
Shutdown voltage threshold: 1.1 V
Pinout:
Pin
Description
VIN+
Positive input (5-80V DC)
VIN-
Negative input (ground)
OUT+
Positive 5V output
OUT-
Negative output (common ground)
Usage:
Connect the DC power source (solar panel, battery, lab power supply) to the VIN+ and VIN- terminals, respecting polarity. Do not reverse polarity; there is a risk of damaging the module.
Before connecting the load, measure the output voltage with a multimeter; it should be approximately 5V.
After verification, connect the device to be powered to the OUT+ and OUT- terminals. Ensure that the load does not exceed the maximum current.
Dimension diagram: