SMD Polarity Identification of LED, Capacitor, Diode, Inductor, IC(Part7)

January 04, 2022

SMD IC Polarity Identification

All ICs (including BGAs) are polarized. Below we list the polarity identification methods for IC packages BGA, SOIC, SOP/QFP, QFN.

BGA polarity identification

BGA is an IC packaging that uses solder balls to replace the pins. The polarity of BGA means that the first ball of the BGA is in the same direction as the PCB pad of the first ball. The BGA polarity is marked by:

BGA polarity

1. The first ball of the BGA is marked by a round point.
2. The first ball of the BGA is marked by a round circle.
3. The first ball of the BGA is marked by the number 1.
4. The first ball of the PCB is marked by a round point.
5. The first ball of the PCB is marked by a round circle.
6. The first ball of the PCB is marked by the letter A.
7. The first ball of the PCB is marked by the number 1.
8. The first ball of the PCB is marked by a bevel.

SOIC polarity identification

The polarity of SOIC is marked by:

1. The first pin of the SOIC is marked by a color strip/round point/round/circle/groove/bevel/slope.
2. The first pin of the PCB is marked by a "*" symbol/round circle.

SOP/QFP polarity identification

The polarity of SOP/QFP is marked by:

1. The first pin of the SOP/QFP is marked by a pit.
2. The first pin of the SOP/QFP is marked by a point that is different from other points in size/shape.
3. The first pin of the PCB is marked by a round point/round circle/color strip.

QFN polarity identification

The polarity of QFN is marked by:

1. The first pin of the QFN is marked by a round point/"+" symbol/< symbol/bevel/point that is different from other points.
2. The first pin of the PCB is marked by a "*" symbol/round circle.

Now you may know how to distinguish polarized components and identify SMD component polarity. If you need SMD components and PCB assembly services, below is what you are looking for.

SMD Component Sourcing and PCB Assembly One-Stop Solution

PCB-HERO, a one-stop advanced PCB manufacturer founded in 1999, provides electronic components sourcing, PCB manufacturing, PCB assembly, complete PCBA tests, and value-added services such as conformal coating, IC programming, end-product assembly.