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  • Overview

    Laser laminate BGA (L2BGA) is one of two types of cavity-down thermally enhanced BGA offered at ASE. It is designed with the chip seated onto the copper heat sink to absorb the heat easily. This method desensitizes the performance deviation out of the chip size and lowers the thermal resistance of junction-to-case (θJC) which makes the external heat sink or fan work more effectively.

    Cavity-Down BGA enhance thermal performance by about 15~20% improvement compared with 4-layer PBGA and by 35% compare with 2-layer PBGA. Electrical performance of Cavity-Down BGA is significant as well. Reasons are attributed to their flexible layout for staggered traces on different layers, shorter VIAS and better shielding effect out of the copper heat sink. With the heat sink covering the signal traces fully, Cavity-Down BGA provides better resistance to external EMI (Electro- Magnetic Interference) noise.

    Application

    Thermally enhanced package design extensive applications include high-speed, high-power semiconductors, such as ASICs, Micro processors, Gate Arrays and DSPs. CS BGA market covers telecom/cellular, laptops/sub-notebooks, PDAs, VME CPU/BUS boards, video GUI and wireless.

    Cavity-Down BGA is an excellent solution for graphic, networking, and communication ICs with high-power and high-speed quality performances.

    Features

    Superior thermal performance (>6W)
    Superior electrical performance
    Build-up substrate design with laser VIA for much higher design density solution
    Designed substrate with stiffiner to control substrate warpage and to enhance more the thermal dissipation
    JEDEC MO-192 / MS-034 standard outlines

    Reliability

    Package Level
    Test Item Reference Standard Condition/Duration
    MSL JEDEC22-A103 Level 3, 30°C/60% RH, 192 hrs
    TCT JEDEC 22-A104-B -55°C to 125°C, 1000 cycles
    HAST JEDEC 22-A118 130°C/85% RH, 33.5 psi 96 hrs
    HTST JEDEC 22-A103-B 150°C, 1000 hrs