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Surface Mount-Types of SMD(Surface Mount Device) Packages

Surface Mount Technology (SMT) and the Surface Mount Device (SMD) is pretty much the same thing. A massive variety of SMD packages is present. For working with the surface-mount box, you usually need a custom printed circuit board (PCB) made for them, which has a matching pattern of copper on which they’re soldered. There a wide variety of SMD packages available in the market, and a user can use it according to its convenience of the electronic component.

 

1、Surface Mount Discrete Resistors

 

There are two main types of surface mount resistors: thick film and thin film.

 

Thick Film Surface Mount Resistors:

 

This SMD is constructed by screening resistive film ruthenium dioxide-based paste or similar material on a flat, high purity alumina substrate surface as opposed to depositing the resistive film on a round core as in axial resistors.

 

Image 1: Surface Mount

 

In Thin Film Resistors:

 

These are constructed on a ceramic substrate with a protective coating, which is also known as a glass coating, with a silver deposited as thick film paste on the ceramic substrate on the terminators. A surface mount resistor has some form of the colored resistive layer with the protective coating on one side and generally a white base material on the other side. Thus the outer appearance offers a simple way to distinguish between resistors and capacitors.

 

Resistor Networks

 

The surface mounts resistor networks or R-packs are commonly used to replace a series of discrete resistors. This saves real estate and placement time.

 

Surface MountImage 2: Surface Mount

 

Ceramic Capacitors for SMT

 

Surface mounts capacitors are another most critical type of SMD package, ideal for high-frequency circuit usage. It does not have any leads and can be placed underneath the container on the opposite side of the PCB. The application Surface mounts capacitors are the decoupling applications and for frequency control.

 

Leadless Ceramic Chip Carriers (LCCC):

 

LCCC has gold plated, groove-shaped terminations known as castellation that provide shorter signal paths allowing higher operating frequencies. The LCCs can be divided into different families depending on the pitch of the package. The most common is 50 mil ceramic leaded chip carrier families. Others are 40,25and, 20 mil families.

 

Surface MountImage 3: Surface Mount