M40-LS720 Solder Paste

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Senju Ecosolder® paste M40-LS720 is a Low Sliver lead-free solder paste which has been formulated as the coming generation of solder paste to save soldering cost strongly desired SMT market.

Sometimes both negative property of low silver solder such as deterioration of thermal fatigue property and rising of melting temperature have obstructed the introduction of low silver solder paste into SMT.

However, Ecosolder® paste M40-LS720 conquered these obstructions with optimizing solder alloy composition, also can stand comparison with previous SAC305 (Senju M705) solder paste in all soldering ability by designing exclusive chemical flux.

Main Features & Benefits

Cost saving

Same process window (Print & Reflow) & Quality as SAC305 solder paste.
Same or more high reliability of solder joint as SAC305 solder paste.
Reducible Head in Pillow, Tombstone problem.
High yield in AOI, ICT process and Excellent Flux cosmetics after reflow.

Solder Alloy Code	M40
Alloy Composition	Sn-1.0Ag-0.7Cu-Bi-In
Melting Temperature (℃)	Solidus: 211 Melting Peak: 1st: 215 / 2nd: 222 Liquidus: 222
Tensile Strength (MPa)	59.4
Elongation (%)	62.8
Poisson ratio	0.35
CTE	21.3
Patent No	JP3753168