Example object

NXP ARM7 LPC2148
64 pins with pin distance of 0.5mm

Introduction

This tutorial outlines how to solder very small mounted devices like micro controller using standard soldering equipment. The tutorial is structured in logical steps starting with necessary tools over placing of the part, fixing, soldering, cleaning and testing the soldered device.

Tools

tweezer with small head
magnifier
transparent tape (e.g. Scotch) for placing of the part
soldering creme
tin-solder smaller than 0.5 mm diameter of wire
soldering iron with small head

click image to enlarge

Step 1: Preparation for soldering

Place a small cord of thin soldering creme to the pad.

click image to enlarge

Pull the injection needle with the soldering creme around 20mm over the pads and create the thin cord. Repeat this for each of the four edges

click image to enlarge

Step 2: Prepare micro controller for placement

Put a small transparent strip on top of the micro controller and place the part to the board. Check if the pins are onto the pads using a magnifier.

Step 3:

Fix the part by soldering diagonal pins. Move the soldering iron orthogonal to the pin. Do not pull the iron in a horizontal way.

click image to enlarge

Step 4: Check position of part

Check the position of the part using a magnifier. Repeat step 3 if necessary

Step 5: Soldering process

Solder all pins my moving the soldering iron orthogonal to the chip. Do not pull the head of the iron over the pins!

click image to enlarge

Step 6: Cleaning

Remove dead soldering cream using a brush and alcohol. Move the hairs of the brush betwenn the pins.

Step 7: Visual and elelektronic testing

Test all pins for short circuits as well as connection. If necessary use soldering wire for removing short circuits. Check soldering using the magnifier.