Printed Circuit Board Assembly & PCB Design SMT Electronics Assembly Manufacturing Forum

Printed Circuit Board Assembly & PCB Design Forum

SMT electronics assembly manufacturing forum.


Solder Iron Temp.

Jorge L. Torres

#9764

Solder Iron Temp. | 7 September, 1999

My company is starting a prototype. The chips that will be used appear to be very sensitive. The vendor part number is Neta-40-2. My question is what solder temp should be used for this part? Any advice is appreciated. THX.

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#9765

Re: Solder Iron Temp. | 7 September, 1999

| My company is starting a prototype. The chips that will be used appear to be very sensitive. The vendor part number is Neta-40-2. | My question is what solder temp should be used for this part? | Any advice is appreciated. | THX. | | If you�re uncertain about that thing best ask your vendor to supply you with the correct datasheets. If there is something different from normal handling procedures than there should be some kind of hint in the datasheet.

Good luck Wolfgang

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Earl Moon

#9766

Re: Solder Iron Temp. | 7 September, 1999

| | My company is starting a prototype. The chips that will be used appear to be very sensitive. The vendor part number is Neta-40-2. | | My question is what solder temp should be used for this part? | | Any advice is appreciated. | | THX. | | | | | If you�re uncertain about that thing best ask your vendor to supply you with the correct datasheets. If there is something different from normal handling procedures than there should be some kind of hint in the datasheet. | | Good luck | Wolfgang | The solder iron tip temperature has to be what it takes to make solder joints - number one. After that, what components will solder wet and stay alive for operational cycles. Pre-heating is a factor for some parts, and I agree with Wolfgang that there ought to be something in the data sheets concerning thermal requirements and cautions. Often there isn't.

Earl Moon

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#9767

Re: Solder Iron Temp. | 7 September, 1999

| | | My company is starting a prototype. The chips that will be used appear to be very sensitive. The vendor part number is Neta-40-2. | | | My question is what solder temp should be used for this part? | | | Any advice is appreciated. | | | THX. | | | | | | | | If you�re uncertain about that thing best ask your vendor to supply you with the correct datasheets. If there is something different from normal handling procedures than there should be some kind of hint in the datasheet. | | | | Good luck | | Wolfgang | | | The solder iron tip temperature has to be what it takes to make solder joints - number one. After that, what components will solder wet and stay alive for operational cycles. Pre-heating is a factor for some parts, and I agree with Wolfgang that there ought to be something in the data sheets concerning thermal requirements and cautions. Often there isn't. | | Earl Moon | Tip temperature is not the key element in soldering although you should always start at the lowest temperature possible. A good rule of thumb is to set the soldering iron tip temperature at 260�C (500�F)and increase the temperature as needed to obtain the desired result.

However, controlling soldering iron tip temperature is not the key element in soldering. The key element is controlling the heat cycle of the work. How fast the work gets hot, how hot it gets, and how long it stays hot is the element to control for reliable solder connections.

The first factor that needs to be considered when soldering is the relative thermal mass of the joint to be soldered. This mass may vary over a wide range. Each joint, has its own particular thermal mass, and how this combined mass compares with the mass of the iron tip determines the time and temperature rise of the work.

A second factor of importance when soldering is the surface condition. If there are any oxides or other contaminants covering the pads or leads, there will be a barrier to the flow of heat. Even though the iron tip is the right size and temperature, it may not be able to supply enough heat to the joint to melt the solder.

A third factor to consider is thermal linkage. This is the area of contact between the iron tip and the work.

This information is copied from our online soldering/rework guide. You can get more details at http://www.circuitnet.com/catalog/c7-1-1.htm

Jeff Ferry

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