IR3508ZMPBF International Rectifier, IR3508ZMPBF Datasheet - Page 18

• Manufacturer Part Number: IR3508ZMPBF
• Description: The IR3508ZM Phase IC combined with any IR XPhase3 Control IC provides a full featured and flexible way to implement a power solution for the latest high performance CPUs and ASICs.
• Manufacturer: International Rectifier

Specifications of IR3508ZMPBF

• Package: 20-Lead MLPQ
• Circuit: X-Phase Phase IC
• Pbf: PbF Option Available

Stencil Design
• The stencil apertures for the lead lands should be approximately 80% of the area of the lead lands.
• The stencil lead land apertures should therefore be shortened in length by 80% and centered on the lead
• The land pad aperture should be striped with 0.25mm wide openings and spaces to deposit approximately
• The maximum length and width of the land pad stencil aperture should be equal to the solder resist opening
Reducing the amount of solder deposited will minimize the occurrence of lead shorts. Since for 0.5mm pitch
devices the leads are only 0.25mm wide, the stencil apertures should not be made narrower; openings in
stencils < 0.25mm wide are difficult to maintain repeatable solder release.
land.
50% area of solder on the center pad. If too much solder is deposited on the center pad the part will float
and the lead lands will be open.
minus an annular 0.2mm pull back to decrease the incidence of shorting the center land to the lead lands
when the part is pushed into the solder paste.
Page 18 of 19
Jan 09, 2009
IR3508Z