What is not permitted for tempered leads in terms of termination?

The concept of termination for tempered leads in electronic assemblies emphasizes the need for secure and reliable connections. A full-clinch configuration is a type of lead termination where the lead is completely bent over the surface of the printed circuit board to form a secure connection. Although full-clinch configurations have their place in certain applications, for tempered leads, they are not permitted. This is primarily because they can create stress points that may lead to failure under thermal cycling or mechanical strain.

Tempered leads are designed to maintain their shape and resist deformation over time. Therefore, a less aggressive termination such as a partial-clinch configuration is often more appropriate as it allows for some flexibility while still ensuring a secure connection. Loose connections, while they might seem benign, can result in intermittent failures and are therefore strictly not allowed. On the other hand, direct soldering is encouraged for providing robust electrical connections but does not typically apply specifically to lead configurations that require certain treatment like tempering.

Overall, understanding the limitations and requirements for different lead terminations is crucial in ensuring the reliability and integrity of soldered assemblies in compliance with J-STD-001 standards.