PCB Assembly Classes

Class A – Through-hole mounted components only

Class B – Surface Mount components only

Class C – Simplistic through-hole and surface mount intermixed assembly

Class X – Complex intermixed assembly (Through-hole, surface mount, fine pitch and BGA)

Class Y – Complex intermixed assembly (Through-hole, surface mount, ultrafine pitch and chip scale)

Class Z – Complex intermixed assembly (Through-hole, ultrafine pitch, COB, flip-chip and TAB)

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