Adding to its series of recently introduced optimized material sets, Henkel has announced a materials combination designed for stacked CSP (SCSP) devices. Uniting die attach material Hysol QMI536NB with mold compound Hysol GR9820, this material set reportedly delivers JEDEC Level 1/260° reflow performance.
 
Both materials perform well in Pb-free environments, with a high resistance to elevated temperatures and demanding manufacturing conditions. GR9820 is a versatile epoxy molding compound with adhesion properties that can be optimized for varying leadframe metallizations. The low-stress, “green” mold compound exhibits ultra low warpage in a matrix package format, with the ability to alter the mold compound resin components to counter-correct “smiling face” or “crying face” warpage in a range of package types.
 
QMI536NB is one-material solution for thin stacked die applications. Traditionally, different die attach materials are used for each of the various layers of a stacked package so as to avoid damage to the die passivation of the first die. This protective and low-bleed formulation can be used for both mother and daughter die, enabling packaging specialists to qualify a single material.  
 
Henkel, www.electronics.henkel.com

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