The side overhang is lowered to a 25% maximum of the width of the lead (4), and end joint thickness (3) is increased to a minimum of 75% of the lead width (4). The solder thickness (5) requirement remains “not specified,” and the side joint length (6) are the same as Class 2, but many of the other specifications have increased requirements.įor instance, the side overhang (2) and end joint width (3), are tightened in both directions by 25%. Mil / Aero and Medical applications typically require Class 3 products.Ĭlass 3 increases the requirements in most areas of inspection for the solder joint over Class 2. Many of Samtec’s products can meet IPC-A-610 Class 3 which is normally required when a product must have continued high performance in extreme / harsh conditions. The side joint length (6) of the solder joint, at the narrowest point, must be at least 150% the width of the lead (4). The solder thickness (5) between the lead and the pad landing is not specified, but a properly wetted fillet must be present.
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