Get Amped Up on PCB Reliability
By Phoenix Contact
Executive Summary
Terminal blocks are small, but
they play an important role in the
performance of a printed circuit
board (PCB). Unfortunately, many
terminal block suppliers use
inferior materials and practice
poor-quality control in their
manufacturing processes. A
design engineer who knows how
to identify a high-quality PCB
terminal block can ultimately
prevent dangerous electrical and
mechanical faults in a system.
Not all PCB terminal blocks are created equally. As you begin to compare terminal
blocks, review the options thoroughly. This paper will help you identify potential
pitfalls before you purchase by properly evaluating:
• Design
• Materials
• Manufacturing quality
- Screws
- Housings
- Wire cage
- Plating
- Assembly
Even the smallest mistakes can be costly. Poor workmanship not only causes
individual parts to fail, but can also be detrimental to the overall system. When
selecting a terminal block, consider every aspect of design and manufacturing,
from the housing to the pressure plate.
Common Defects
Pin placement
Look for inconsistent pin placement. Improperly aligned pins can cause stubbing
with the mating connector. Pins not centered in through-hole can also cause poor
solder and difficulty in PCB placement. Receptacle gap results in high resistance,
as well as potential stubbing with header.
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