2.1 Creepage Distance Provided by Silicon Labs Packages Silicon Labs offers numerous packages with various creepage distances. The following table details these differences. Typical Creepage Distances Offered by Silicon Labs Packages Package Nominal Creepage (mm) Creepage in Air Per IEC60112 (mm) QSOP-16 3.6 3.6 SOIC-8 4.01 3.9. Pcb Creepage Calculator High Voltage Pcb Design Electrical Engineering Stack Exchange. High Voltage Pcb Design Creepage And Clearance Distance Pcb.
The international standard for medical safety equipment,IEC 60601, covers electrical aspects of isolation componentsand differs from other standards in several respects, includingcreepage and clearance requirements and defibrillationtolerance testing. The creepage requirements under manyother standards allow the relationship between creepageand working voltage to be interpolated smoothly betweenthe values listed in the specification tables. For example,if the creepage is slightly below the table values, the workingvoltage can be scaled down proportionately, and the part willretain most of its operating range. The IEC 60601 standard,in contrast, explicitly disallows interpolation of creepageand working voltages. 125 V rms working voltage requiresgreater than 6 mm of creepage, and 250 V rms workingvoltage requires greater than 8 mm of creepage for insulationthat provides two means of patient protection—there areno exceptions to this for piece parts.
A common package for reinforced isolator components is theJEDEC standard SOIC16-W that is 7.4 mm wide and 2 mmthick. The shortest path along the surface of this package isusually around the end and is typically only 7.6 mm. Thisis shorter than what one might expect because, similarto most leaded devices, it includes metal tabs along thecreepage path, which must be deducted from the creepagedistance according to the rules for measuring creepage.
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These metal tabs are tie bars that hold the package leadframe during the lead forming step in manufacturing. Thesetie bars are usually not connected to the internal lead framebut are exposed as floating metal at each end of the packge.Even so, the creepage measurement must account for the tiebars, resulting in 7.6 mm,* which, for medical applications,fails to meet the 8 mm creepage requirements. As a result,JEDEC standard SOIC-16W packages may be used only up toa working voltage of 125 V rms. Because the world primarilyworks on 220 V rms to 240 V rms, this package is not adequatefor medical applications in most of the world.Fortunately, there are a number of ways to meet 8 mmcreepage requirements for worldwide medical applications.With specialty packaging, however, it is desirable to keep suchpackages close to JEDEC standard dimensions to reduce costand risk for designers. An oddly shaped package incurs highcosts because assembly lines must be retooled to handlethem, and they create high risk because custom assemblyequipment creates a single source bottleneck if broken down,as it becomes more difficult to maintain or replace, resultingin production downtime. Keeping compliance to JEDEC standardpackaging allows part cost to be minimized throughuse of standard tooling and does not lock assembly intospecific locations in case of facility problems. ADI’s challengewas to make a package that matches JEDEC standards.
Gallery vault pro key 1.2.1 apk free download. The iCoupler® solution is to change the creepage path forthe isolator by extending the end of the package. When thepackage is extended from the end pin to the end of thepackage, the shortest distance moves from around-the-endof the package to over-the-top. This removes the tie barsfrom the creepage path and allows the full thickness of themolding compound to be counted in the creepage. This valueis 8.3 mm (minimum) for a JEDEC standard wide-body SOIC.To achieve this, ADI has introduced a package that uses thebody of a 20-lead SOIC package with the lead frame of a16-lead package. This increases the distance around theend of the packge by 2.54 mm to about 10 mm and changesthe creepage path to over-the-top of the device. Becausethe package dimensions are the same as JEDEC standardpackaging, production tooling is compatible with the newpackage, keeping costs and infrastructure in line withcurrent products. This new package is rated for 250 V rmsworking voltage under IEC 60601.
Clearance And Creepage Distance Calculator Worksheet
*Some suppliers specify creepage based on their own measurements that do not consider tiebars. It is recommended that designers refer to the certified creepage as measured by UL,CSA, VDE, TUV, and other certifying agencies.