Soldered surfaces must be free of lead to begin with. This includes the PCB as well as the component. Lead contamination on a lead-free solder joint will significantly reduce the reliability of the joint. All lead-free alloys melt at a higher temperature than traditional tin-lead alloys. The temperature of the soldering iron may need to be increased, and both the components and PCB will need to withstand these higher levels.

Primarily NEMI and IPC in the United States and Soldertec and Smartgroup in Europe. NEMI, which develops technology “roadmaps” for the electronics industry, identified a gap in the manufacturing infrastructure necessary for conversion to lead free in the early 1990’s when the first WEEE draft appeared. Since then NEMI has been instrumental in providing leadership and coordination to facilitate the conversion to lead-free.

Higher melting point of Lead-free solder may cause physical and thermal damage to components and PCB.

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Since there is higher tin content, with higher temperature and presence of more active flux, the erosion of soldering tips occurs faster than regular tin/lead solder.

Altera does not have a set schedule to introduce lead-free solder bump flip-chip products at this time. Internal solder bumps are exempted from the RoHS Directive until 2010, and Altera is closely monitoring the industry progress with a plan to start qualification in the near future. Home | Products | Support | End Markets | Technology Center | Education & Events | Corporate | Buy On-Line

Reflow soldering: SnAgCu, SnAgCuBi, SnAg, SnAgBi, SnZnBi, SnIn (the bismuth-containing solders are more suitable for low temperature soldering) Wave Soldering: SnAgCu, SnCu, SnCu(Ni 0.1%), SnCuX, where X is the small fraction of elements claimed to increase performance A13. No suitable alternative has yet been identified for this solder which melts at around 302OC.

A31. Yes, but there is the potential for poor alignment and open joints. Since the usual SnPb reflow profile may not exceed the melting point of the BGAs’ lead-free solder balls, the SnPb solder paste melts but the SnAgCu solder balls do not. The lack of ball collapse may cause a lack of contact between the solder paste and the solder ball.

QUESTION ? I have been reading some stuff about concrete, and since I have lung problems (chronic bronchitis)I wonder what kind of mask or respirator I should use. One article said to use something that is rated for silica because of the lung disea

Click http://www.freescale.com/files/product/doc/ENV_MSLPPT.pdf to download the Freescale recommendation. Freescale targets a PPT of 260°C with an MSL of 3 or better, however, some products may not be able to meet this target. Freescale provides the PPT and MSL level for each part number via web access or by special request.

Vacuum sealing has become an increasingly popular method of extending food life without adversely affecting food quality. However, certain common sense food safety principles do apply. For example: It is always advisable that poor quality foods should never be vacuum packed in attempt to extend shelf life, nor should vacuum sealing be used solely as a means of perpetual conservation of leftover foods. Vacuum packing is never a substitute for chilling or freezing.

A: You should note that some alternative compounds have a higher melting point than the tin-lead compound. As such, a substantially higher re-flow temperature may be required for lead-free alternatives. Manufacturing equipment to handle material with these high temperatures, such as a multi-zone oven, is costly, and will require significant investment from your company or your contract manufacturer.

A18. Yes, for example, maintaining the composition of the solder bath, and advice should be sought from your solder and equipment suppliers. For example, the copper levels must be taken into account when replenishing the solder bath, and copper dissolution of the tracks and pads can result in their being less than the minimum acceptable thickness.

A29. There might be. If the component termination is lead-free, no compatibility issues would be expected with lead-free soldering. However, if the component termination does contain lead, the resulting lead concentration in the solder joint may be in the range 1-5wt%. If so, the there can be risks of poorer reliability. (NB. This is an area of keen research).

Aavid Thermalloy's RoHS policy is described in its RoHS specification, RoHS-9000. It generally sets the same limits for the six RoHS substances as currently specified by the EU legislation. It also bans asbestos and the use of ozone-depleting substances.

We highly recommend Audio Note silver solder. This is one of the very few solders that has been specifically developed for audio use and is very highly rated.

Solder is a lead/tin mixture that is melted and used to bond two pieces of certain types of metal together.

If a customer requires that a package type not qualified as lead-free be manufactured and supplied, a request must be submitted to the Maxim Integrated Products Business Units.

We believe it is an unethical conflict of interest for a certifying organization to profit from failing its students. A more in-depth explanation follows. The International Dance Exercise Association (IDEA) once admitted that their pass rate was only 64%. And they were proud of it, remarking that it reflects on the toughness of their testing.

When it became apparent that a large number of inmates were identified definitively as gang members, the NJDOC designed a special unit to house the leaders apart from the general population. To that end, the Security Threat Group Management Unit (STGMU), located at Northern State Prison in Newark, was devised to isolate problematic gang-affiliated inmates, or those identified as gang leaders, from the general population.