# DC-DC Buck Converter Module 5-80V to 9V, 1.25A

> DC-DC buck (step-down) converter with input voltage 5-80V DC and fixed output 9V DC, continuous current 1.25A, peak current 1.5A, efficiency over 90%. Shutdown current consumption 0.1 µA, enable threshold 1.35V, shutdown threshold 1.1V. Aluminum substrate for thermal dissipation. Suitable for Arduino (VIN), wireless modules, motor drivers (L298N, L293D) and embedded systems.

- Page: https://sigmanortec.ro/en/dc-dc-buck-converter-module-5-80v-to-9v-125a
- Price: 14.94 RON
- Availability: Out of stock
- Reference: 88191 · EAN: 5946956911142
- Category: Electronic components > Step Down Modules
- Specifications: Source Type: descend; Current 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 step-down buck converter, ideal for obtaining a stable 9V supply from sources with wide variations between 5 and 80V. It delivers up to 1.25A continuous, over 90% efficiency for reduced losses, extremely low standby consumption, and an aluminum substrate for efficient heat dissipation. Suitable for Arduino on VIN, wireless modules, motor drivers, and embedded systems.
This buck (step-down) DC-DC converter is designed to convert a variable input voltage (5-80V) to a stable 9V 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 9V source from a highly fluctuating input.
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: 9 VDC
Continuous current: 1.25 A
Maximum peak current: 1.5 A
Efficiency: > 90%
Quiescent 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 9V output
OUT-
Negative output (common ground)
Usage:
Connect the DC power source (solar panel, battery, laboratory power supply) to the VIN+ and VIN- terminals, respecting the polarity. Do not reverse the polarity, as there is a risk of damaging the module.
Before connecting the load, measure the output voltage with a multimeter; it should be approximately 9V.
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: