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Small green circuit board with two USB ports and screw terminals

JacobsParts Inc.

JacobsParts Inc. USBMOD-J 5V 3A Step-Down Power Strip 6-40V IN

SKU CH-EW52-CTM44

A 6-40 V DC buck module adds dual USB charging at 5 V 3 A with screw-terminal input

  • TypeStep Down (Buck) Voltage Regulator
  • Input Voltage5 V
  • Current Rating3 A
  • Power Rating15 W
  • FeaturesDC to DC
  • Converts 6-40V DC sources into dual USB charging
  • LM2596 regulator delivers 5V at 3A total output
  • Screw terminals enable secure, tool-free power connections
  • Compact 59mm x 21mm x 17mm board fits tight enclosures
  • 15W capacity charges phones, tablets and USB devices

USB step-down module with dual ports

The JacobsParts USBMOD-J converts a 6-40V DC source into a regulated 5V 3A supply using an LM2596 buck regulator. Two USB ports deliver up to 15W total for charging phones, tablets or powering small boards. Screw terminals provide a secure wiring connection and the board measures 59mm by 21mm by 17mm.

Builders adding USB power to existing DC systems

This module suits engineers or hobbyists integrating USB charging into custom enclosures, vehicles, solar setups or industrial gear where a 6-40V rail is already present. It is not for users needing a mains-powered strip, AC surge protection, higher output current, multiple independent voltage rails or a finished housing with switches and indicators.

Fixed 5V 3A output from 6-40V input

The single specification that decides fit is the regulator’s fixed 5V 3A output driven by the LM2596 IC across the full 6-40V input range. If the target device requires a different voltage, adjustable output, more than 3 amps or an input outside 6-40V DC, this board will not meet the requirement.

Highlights

  • Converts 6-40V DC sources into dual USB charging
  • LM2596 regulator delivers 5V at 3A total output
  • Screw terminals enable secure, tool-free power connections
  • Compact 59mm x 21mm x 17mm board fits tight enclosures
  • 15W capacity charges phones, tablets and USB devices

Specifications

BrandJacobsParts
ModelUSBMOD-J
TypeStep Down (Buck) Voltage Regulator
Input Voltage5 V
Current Rating3 A
Power Rating15 W
FeaturesDC to DC

Questions about this item

What are the board dimensions and screw-terminal spacing for mounting the USBMOD-J?

The module measures 59mm long, 21mm wide and 17mm high; the screw terminals sit on the 21mm edge so allow that clearance when drilling your enclosure.

How do I wire the 6-40V input to the screw terminals without reversing polarity?

Loosen both terminals, insert the positive lead into the terminal marked + and the negative into the terminal marked −, then tighten; reversing them will damage the LM2596 regulator.

Will the LM2596 regulator need a heatsink or replacement after continuous 3A use?

At full 3A load the LM2596 runs warm; adding a small heatsink to the IC extends its life, and the module itself is replaced only if the regulator fails.

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