-
solder ball
-
生產
-
主要生產公司
-
SMIC (千柱)
- alpha
- DS(ducksan)
- MKE
-
大小
- 150um~750um
-
組成
composition
-
lead
- low melting T
- low cost
- phase out
due to toxicity
-
lead free
- lead free solder = SAC 305
- 組成表
-
生產過程
(主要兩種方法)
-
Cutting
- Cutting
- Melting Zone
- Sphering(球形) zone
- Cooling Zone
- 所切的Solder Chip Volume
決定錫球大小
-
Atomizing
- Melting Zone
- Exciter (控制錫球大小
- Low Velocity Zone
- Sphering(球形) zone
- Cooling Zone
- [Exciter ]
frequency & nozzle 直徑
決定錫球大小
-
後續步驟
-
保存
-
保存在
- 玻璃罐(glass jar)或塑膠罐(plastic jar)
-
使用
-
常常使用在
-
BGA
- CSP
- FC
-
特殊
-
Cu core solder ball
- use on Shinko MCeP,PoP
- reflow will not collapse and keep space
-
Plastic core solder ball
- plastic can improve mechanical stress
and improve reliability for CTC and drop test