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2020-06-04 | Document No.: AN149
Handling recommendations
Please be aware of ESD safety while handling the LED (see Application Note
“ESD protection while handling LEDs”). In addition to the general guidelines for
the handling of LEDs, additional care should be taken that mechanical stress
(e.g. sheering forces) on to the elastic silicone encapsulation is eliminated or
reduced to the greatest extent possible (see also application note “Handling of
silicone resin LEDs”).
Although manual handling and assembly is possible, automatic placement is
highly recommended. For manual assembly and placement — in the production
of prototypes, for example — the diligent use of tweezers is recommended. The
LED must not be lifted from the top, because this may cause damage to the
surface. In addition, it is recommended to hold the LED metal substrate by using
tweezers and applying any force equally to the entire LED package as shown in
Figure 17. If there is no alternative to the use of tweezers, the LED can be picked
and handled at the metal substrate using finger cots or anti-static plastic gloves.
In general, any type of sharp objects (e.g. forceps, fingernails, etc.) should be
avoided in order to prevent stress to, or penetration of, the encapsulation since
this can lead to the impairment of the component.
Figure 17: Recommended manual handling
When processing by means of automated placement machines, care should be
taken to use an appropriate pick-and-place tool and to ensure that the process
parameters comply with the package's characteristics. An example of a suitable
pick-and-place nozzle is given in the form of the ASM SIPLACE tool number
308199. Figure 18 shows the recommended nozzle.
