Weidmüller is a leading international provider of solutions for electrical connectivity,transmission and conditioning of power, signal and data in industrial environments.The company with headquarters in Detmold/Germany develops, produces and sellsproducts in the field of electrical connectivity and electronics all over the world.
the
same time this ensures 100% compatibility with the SMT
process. The progress made the development of
surface mounted devices (SMD), that allowed the devlopment
of the SMT manufacturing process the first place has also
played role.
Benefits THR:
• stable connection the PCB
• only one soldering process
• longer need for hand wave soldering
• automatic assembly
• lower production costs
In order use THR components the SMT process, they
must meet certain requirements. SMT now the accepted standard PCB
manufacturing.
The THR procedure came from the awareness that for heavy
components such coils transformers and anywhere where
there mechanical forces act the (for example, terminals,
connectors, relay sockets etc. THR ensures stable connection the THT
components the PCB using the push-through pins.W.), still required stable solder
connections. Weidmüller has developed product
range for the through hole reflow process (THR), this makes
wired component parts usable the SMT process and
allows100% processing the SMT production line. There are still some components, the main
electro-mechanical components like connectors relays,
which are not available SMD version, they are therefore
mounted following the SMT process using the classical THT
assembly onto the PCB.12
Technicalappendix
W
SMT design-in recommendations
Weidmüller connectors the reflow soldering process
The PCB assembly process has undergone fundamental
change recent years. SMT compatible product always compromise between
optimal SMT capability and the stability the solder
connection.
Through hole reflow method connect THT components
with the SMT reflow solder process. Supplementary to
conventional SMD assembly, the THR method allows SMD
components and wired components placed the SMT
printed-circuit board and soldered using the reflow process. The conventional through-hole
mounting technology (Through Hole Technology, THT) has been
increasingly replaced surface mounting technology (SMT).
The reasons for this was the increasing demands of
miniaturisation, higher functional density and lower
manufacturing costs. SMD solder connections are not suitable for heavy
components terms their mechanical strength.
