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參數(shù)資料
| 型號： | SFC3.3-4.WF |
| 元件分類： | TVS二極管 - 瞬態(tài)電壓抑制 |
| 英文描述： | 150 W, UNIDIRECTIONAL, 4 ELEMENT, SILICON, TVS DIODE, MO-211BB |
| 封裝： | FLIP CHIP-6 |
| 文件頁數(shù)： | 4/7頁 |
| 文件大?。?/td> | 214K |
| 代理商： | SFC3.3-4.WF |
4
2004 Semtech Corp.
www.semtech.com
PRELIMINARY
PROTECTION PRODUCTS
SFC3.3-4
Device Schematic and Pin Configuration
Layout Example
NSMD Package Footprint
Device Connection Options
The SFC3.3-4 has solder bumps located in a 3 x 2
matrix layout on the active side of the device. The
bumps are designated by the numbers 1 - 3 along the
horizontal axis and letters A - B along the vertical axis.
The lines to be protected are connected at bumps A1,
B1, A3, and B3. Bumps A2 and B2 are connected to
ground. All path lengths should be kept as short as
possible to minimize the effects of parasitic inductance
in the board traces.
Flip Chip TVS
Flip chip TVS devices are wafer level chip scale pack-
ages. They eliminate external plastic packages and
leads and thus result in a significant board space
savings. Manufacturing costs are minimized since they
do not require an intermediate level interconnect or
interposer layer for reliable operation. They are com-
patible with current pick and place equipment further
reducing manufacturing costs. Certain precautions
and design considerations have to be observed how-
ever for maximum solder joint reliability. These include
solder pad definition, board finish, and assembly
parameters.
Printed Circuit Board Mounting
Non-solder mask defined (NSMD) land patterns are
recommended for mounting the SFC3.3-4. Solder
mask defined (SMD) pads produce stress points near
the solder mask on the PCB side that can result in
solder joint cracking when exposed to extreme fatigue
conditions. The recommended pad size is 0.225 ±
0.010 mm with a solder mask opening of 0.350 ±
0.025 mm.
Printed Circuit Board Finish
A uniform board finish is critical for good assembly
yield. Two finishes that provide uniform surface coat-
ings are immersion nickel gold and organic surface
protectant (OSP). A non-uniform finish such as hot air
solder leveling (HASL) can lead to mounting problems
and should be avoided.
To Protected IC
To Connector
Ground
Applications Information
6
54
12
3
A
B
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