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Counting Legs or Pins of IC

Any mobile phone PCB has several IC or Integrated Circuit. These are SMD or Surface Mount Electronic Components. Before understanding how to count legs or pins of any IC, let us learn about IC.
What is an IC?
An IC is an electronic component made up of combination or integration of several other electronic components like resistor, capacitor, coil, diode, transistor etc.
How Many Types of IC are There?
There are mainly 2 types of ICs:
  1. Leg-Type IC: This type of IC has legs or pins. These types of ICs are again divided into different categories but we will not discuss it here because it has nothing to do with mobile repairing.
  2. Ball-Type IC: This type of IC has BGA (Ball Grid Array) underneath the IC. These types of ICs are again divided into different categories but we will not discuss it here because it has nothing to do with mobile repairing.
How to Count Legs or Pins of Leg-Type IC?
Counting of leg-type IC starts in Numerical Digit in Anticlockwise Direction starting from the Nose Point or Cut Point. Have a look at the photo below to understand it clearly.
How to Count Legs or Pins of Leg-Type IC
How to Count Legs or Pins of Leg-Type IC
How to Count Balls of Ball-Type IC?
Counting of Ball-type IC is done in Both Clockwise and Anti-Clockwise Direction. Rows are counted in Digit Numbers (1, 2, 3, 4…) in Clockwise Direction. Columns are counted in Alphabet (A, B, C, D…) in Anti-Clockwise Direction.
NOTE: When counting Columns, “I” and “O” are omitted because they look like “1” and “0”.
How to Count Balls of Ball-Type IC
How to Count Balls of Ball-Type IC
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