What is a SMD machine?
SMT (surface mount technology) component placement systems, commonly called pick-and-place machines or P&Ps, are robotic machines which are used to place surface-mount devices (SMDs) onto a printed circuit board (PCB).
The purpose of this guide is to introduce SMD (Surface Mount Device) hand soldering. The guide is organized into different methods. Each method is used specifically for a group of SMD components.
- Dip soldering is a small-scale soldering process by which electronic components are soldered to a printed circuit board (PCB) to form an electronic assembly. The solder wets to the exposed metallic areas of the board (those not protected with solder mask), creating a reliable mechanical and electrical connection.
- Profile recommendations
Zone Lead (Sn63 Pb37) Preheat to 150 °C in 60 s Soak from 150 °C to 165 °C in 120 s Reflow Peak temperature 225 °C to 235 °C, hold for 20 s Cooling -4 °C/s or free-air cooling
- Therefore, solder that contains lead is considered to be toxic. Ingesting even a small amount of lead is dangerous because it is a cumulative poison which is not excreted by normal bodily function. Soldering with lead (or other metals used in soldering) may produce fumes that are hazardous.
SMD resistors on a circuit board from a USB memory stick. SMD stands for Surface Mounted Device. An SMD is any electronic component that is made to use with SMT, or Surface Mount Technology.
- Position the resistor with the gold or silver color band to the right..
- Read the color sequence that must be decoded to determine resistance.
- Determine the coded number for the resistive value.
- Determine the tolerance of the resistor.
- Determine the decoded number for the resistive value.
- "Tolerance is the percentage of error in the resistor's resistance, or how much more or less you can expect a resistor's actual measured resistance to be from its stated resistance. A gold tolerance band is 5%tolerance, silver is 10%, and no band at all would mean a 20% tolerance." Source: Resistor Color Codes.
- A solder paste is essentially powder metal solder suspended in a thick medium called flux. Flux is added to act as a temporary adhesive, holding the components until the soldering process melts the solder and fuses the parts together. The paste is a gray, putty-like material.
Updated: 16th October 2019