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5V/800mA Switch Mode Power Supply (SMPS) Module PCB

5V/800mA SMPS is an easy-to-use module, which uses minimal components to convert a 220V AC input to a 5V DC output. The module has an output current rating of 800mA. It is widely used in mobile chargers, audio/video players, and more.


Features and Specification

This section mentions some of the features and specifications of the SMPS module.

  1. Input Voltage: 220V AC
  2. Output Voltage: 5V DC
  3. Output current: 800mA


Pin Configuration 

The module has a simple pin configuration. It has a total of four I/O pins, 2 of which are for the AC input and the other two for 5V DC output.

Pin Type

Pin Description

IN +

Positive supply 220V AC

IN -

Negative supply AC


Positive supply output 5V DC


Negative supply DC


Note: Some of the modules might not have pinouts mentioned. You can use a multimeter and find out the output pins on the board.



The onboard circuit is not very complexed, it uses minimal and basic components in order to perform its operation. The circuit contains a step-down transformer which lowers down the 220V AC(input) to 5V AC, once the voltage is stepped down to 5V it is then passed through four diodes which act as a rectifier and convert the AC voltage into DC voltage. After which a series of capacitors and resistors are used to filter out the AC components and provide a pure 5V DC output.



As mentioned earlier that some of the SMPS modules which you buy would not have the pinout mentioned. The image below can be referred to know the input and output pins of this module.

5V SMPS Module

In this specific module on which NC-329 is mentioned. The output can be taken across the filter capacitor, which is beside the transformer. The image can be referred for a better understanding. Other SMPS modules are also available in the marker whose pinouts are not mentioned, so it is always wise to use a multimeter and locate the filter capacitor and take the output across it.



ZFX-M303 AC100-240V DC 5V, HLK-PM01 Hi-link - 5V 3W, Precision 5V 700mA (3.5W) Isolation Power Supply Module AC-DC Step- Down Module 220V to 5V.



Here are some of the applications of the SMPS.

  1. Mobile/laptop chargers
  2. Microcontroller Supply
  3. Audio/Video players
  4. DC motors


2D Model / Dimensions

Below is the 2D model of the SMPS module along with its dimensions in millimeters and inches. The following information can be used to create custom footprints and be used for PCB designing and CAD modelling.

5V SMPS Module Dimensions

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