What are SOT and SOD packages?
SOT's full English name is: Small Outline Transistor (Small Outline Transistor), SOT is a surface mount package form, generally pin less than or equal to 5 small outline transistors. According to the different width of the surface is divided into two kinds, a width of 1.3mm, a width of 1.6mm.
SOD's full English name is: Small Outline Diode (Small Outline Diode), SOD is often followed by a string of numbers, indicating the standard serial number of the package, such as: SOD-23, SOD-523, SOD323 and so on.
In fact, SOD refers to the package of SMD diode, while SOT is generally refers to the package of SMD triode.
Common SOT package.
Common SOD package
The previous article to the 1970s DIP package, and to the early 1980s, SMT (Surface Mount Technology surface mount technology) became popular, the package pin began to change, from the DIP direct plugging way slowly derived from the SOP package form.
What is SOP package?
SOP's full English name: Small Outline package (small outline package), pins from the two longer sides of the lead, the end of the pins outwardly extended in a gull-wing shape of a surface mount package.SOP naming rules
SOP package naming is the same as DIP, the number after it indicates the number of pins of the package, such as SOP8, 8 indicates the number of pins (4 pins on each side).
Common types of SOP
SOP's "alternative" package
1、SOJ package
SOJ's full English name: Small Outline J-Lead (small size J-shaped pin package), the pins from both sides of the package lead down to the J-shaped. Mainly used in storage.2, SOIC package
SOIC's full English name: Small Outline Integrated Circuit (small outline chip), literally understand SOIC = SOP, but I look at the data of the major manufacturers found that its size has a wide body (wide) and narrow body (narrow), to TI's SN74hc595 for example.In its pdf data shows that the SOIC16 package size has wide and narrow body two. After burning the small universe of science and technology, I finally found that SOIC follows different standards (JEDEC standard and EIAJ standard), resulting in the same package but the size of different situations.
