Understanding IPC Class 2 vs Class 3 Solder Joints

8 月 22, 2023 CONNECTOR

In the manufacturing world there are standards for just about everything, and they all are typically there to ensure a product can perform as expected for the end application. Among these standards is IPC-A-610 covering solder joints for varying types of connector termination styles.

we are going to take a quick look at IPC-A-610 Class 2 and Class 3 solder joints, and some of the requirements of those two classifications. To narrow the focus further, we are looking at a J-Lead solder joint exclusively.

What is IPC-A-610?

IPC-A-610 covers the “Acceptability of Electronic Assemblies,” and more specifically for this blog we will look at the requirements for J-Lead solder connections. Since varying applications have different requirements, IPC has different classes and what a solder joints must look like to meet those class requirements.

Class 2 (J-Lead Components)

Class 3 (J-Lead Components)

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. Mil / Aero and Medical applications typically require Class 3 products.

Class 3 increases the requirements in most areas of inspection for the solder joint over Class 2. 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.

For instance, the side overhang (2) and end joint width (3), are tightened in both directions by 25%. 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). While this may not seem to be a huge increase, it does add to the difficulty of producing a conforming product.

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