Information required on RoHS Declaration Class( & Exception 7A) for MOSFET NVTFS5C471NLWFTAG

Question

I need clarification regarding ROHS compatibility of NVTFS5C471NLWFTAG(n-Channel MOSFET).

Document given by onsemi says

Now, I need to confirm this ROHS compliant or not?

Because the exception calls for “Lead in high melting temperature type solders(i.e. lead based solder alloys containing 85% by weight or more lead)."

If we use the Lead-free assembly process, whether this component can be accepted as ROHS complaint.

I need to get confirmation from my ASSY vendor on this.

Answer 1

In the legislation, there are 4 exemptions that can be granted when the substitutions/solutions are

• Scientifically and/or practically not applicable or not feasible, or
• The negative impacts to environment/health/safety is negligible against the benefits.

The exemption you marked is one of those 4.

It indicates that during the manufacturing of the component (the NMOS in your case but could be an IC or any chip-type component that contains a substrate) lead-based solder (having at least 85% by weight) is used at chip level by the manufacturer. This is under exemption and therefore allowed because the alternative processes were possibly impractical for the manufacturer.

The component is still RoHS-compliant even with having lead-based solder at chip level. So this doesn't concern you. But you still should follow lead-free soldering process requirements.