Contents
What is SAC105?
Tin-silver-copper (Sn-Ag-Cu, also known as SAC), is a lead-free (Pb-free) alloy commonly used for electronic solder. Cheaper alternatives with less silver are used in some applications, such as SAC105 and SAC0307 (0.3% silver, 0.7% copper), at the expense of a somewhat higher melting point.
What is SAC305 alloy solder?
SAC305 is a lead-free alloy that contains 96.5% tin, 3% silver, and 0.5% copper. This alloy falls under the JEIDA recommendation for lead-free soldering. When used in wave soldering, AIM’s SAC305 bar solder offers far superior fluidity as compared to other alloys and makes of bar, resulting in excellent flow.
What is SAC405?
LINQALLOY SAC405 solder Spheres are lead-free Tin/Silver/Copper alloys that contain 95.5% Tin (Sn), 4% Silver (Ag), and 0.5% Copper (Cu) and is often written as Sn95.
What is non lead solder made of?
Lead-free solder can be made from different compositions (% weight) of metals, such as Tin (usually the main element), Silver, Copper, Antimony, Bismuth, Cobalt, Nickel, Indium, Zinc, Germanium, and rare earth elements. The different compositions decide the properties of the solder paste.
Is SAC305 RoHS compliant?
SAC305 lead-free alloy contains 96.5 % tin, 3% silver, and 0.5% copper and is RoHS, REACH and JEIDA compliant. Applications include Wave, Selective, Hand and SMT Reflow Soldering. SAC305 is also available in AIM flux cored wire solders and solder pastes.
What is the typical peak temperature of SAC305 solder alloy?
SAC305 begins to melt at 217°C, reaching its fully liquid state at approximately 220.6°C. Recommended reflow temperatures are typically at least 13°C higher than melting temperatures; hence the SAC305 peak temperature window of 233 – 255.
What is eutectic solder?
The words eutectic solder describe a solder alloy that melts and freezes at one single temperature. A good example of this is Tin 63% / Lead 37% solder which melts and freezes at 183 °C. This melting point is much lower than the melting points of either pure metal which are 232 °C (tin) and 327 °C (lead).
Is lead-free solder same as silver solder?
Since even small amounts of lead have been found detrimental to health as a potent neurotoxin, lead in plumbing solder was replaced by silver (food-grade applications) or antimony, with copper often added, and the proportion of tin was increased (see Lead-free solder.)
Is lead-free solder better than lead?
From a mechanical influence point of view, lead-free solder is stronger than leaded solder. Furthermore, lead-free solder forms surface oxides, flux impurity, and alloy deposits that can cause poor contact resistance performance.
Why is lead in solder?
1.1 Lead Solder Generally, leaded solder is composed of tin and lead. The advantage of using leaded solder is its adequate flowing capacity. It has a lower melting point than lead-free solder; hence, presenting less thermal effects to components.
What temperature does solder melt?
The melting points of tin and lead are 232 °C and 328 °C respectively, whilst the solder melts at a lower temperature than either of these. (Lead-free solder tends to melt at about 220°C.) Thus the order of melting is: solder, tin and lead and the order of solidifying is the opposite.
What temperature should I reflow solder?
Reflow solder heat resistance: Reflow peak temperature of 260°C (500F) for 10 seconds maximum, and reflow zone temperature of 220°C (428F) for 60 seconds.
Which is better SAC105 ball or SAC305 paste?
SAC105 ball with SAC305 paste has the lowest thermal fatigue resistance under the conditions tested, with Sn-3.5Ag and SAC 305 having similar and superior performance. Failures for all alloys were confirmed to be due to thermal fatigue in the bulk solder near the package pad.
What kind of solder paste is sac 305?
SAC 305 solder paste was used in all cases to solder the packages to the test boards, which is the most common practice in industry today. The test vehicle used in this study was leveraged from an earlier project by our “Industry Working Group,” as described by Bath et al. [10].
What is the peak reflow temperature of SAC105 paste?
Three sets of boards were built to investigate the three different ball alloys. In each case, the peak reflow temperature was 240-243°C in order to achieve full mixing, given ball alloy liquidus temperatures of 219°C – 225°C and SAC305 paste liquidus of 219°C [11, 12].
What kind of alloys are used in solder joints?
This investigation focused on the thermal fatigue performance of solder joints made using three common BGA ball alloys: SAC105, Sn-3.5Ag, and SAC305. Accelerated thermal cycle (ATC) testing was performed using a 1.0-mm pitch, 676 PBGA daisy-chain test vehicle.