General > General Technical Chat

Flat Sections in LED Leads -- Why?

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wraper:

--- Quote from: EPAIII on December 07, 2021, 12:46:59 pm ---it can be used both in the production process to mold the plastic around the working end in a precise manner.

--- End quote ---
Dunno how it is supposed to help, neither I've ever seen the plastic molded around the LED. EDIT: seems I understood what was meant wrong

--- Quote ---And secondly it can be used to space the LED a precise height above the PCB for mechanical assembly as the circuit board is assembled. Many products will have an outer case with a hole which the LED protrudes through. It needs to be high enough to be seen but low enough to not interfere with final assembly.
--- End quote ---
It has little use for such application since does not help to keep the LED straight on the board.

--- Quote ---It can also be used to automate the precision bending of the leads if that is needed for assembly.
--- End quote ---
I don't see how it will help with this either. It only bakes bending harder, since bending close to wider area will cause the bend area to have a sharp radius where the width changes and make it prone to cracking.

langwadt:

--- Quote from: wraper on December 07, 2021, 01:06:00 pm ---
--- Quote from: EPAIII on December 07, 2021, 12:46:59 pm ---it can be used both in the production process to mold the plastic around the working end in a precise manner.

--- End quote ---
Dunno how it is supposed to help, neither I've ever seen the plastic molded around the LED.

--- End quote ---

the plastic that makes up the plastic part of led is molded ...

TimFox:
When LEDs were a novelty, I remember through-hole parts (low-power red LEDs) in a metal case similar to TO-18 (with clear plastic top) that had non-rigid wire leads (again, similar to a 2N2484 transistor) without the steps.  I haven't seen them in decades, however.

wraper:

--- Quote from: langwadt on December 07, 2021, 06:28:14 pm ---
--- Quote from: wraper on December 07, 2021, 01:06:00 pm ---
--- Quote from: EPAIII on December 07, 2021, 12:46:59 pm ---it can be used both in the production process to mold the plastic around the working end in a precise manner.

--- End quote ---
Dunno how it is supposed to help, neither I've ever seen the plastic molded around the LED.

--- End quote ---

the plastic that makes up the plastic part of led is molded ...

--- End quote ---
I understood it as if after the LED was produced someone molds the plastic over it. Leadframe in a way to keep its shape not only during plastic molding but during the whole manufacturing process, such as die attaching, wire bonding.

Infrared_Fred:

--- Quote from: TimFox on December 07, 2021, 07:05:43 pm ---When LEDs were a novelty, I remember through-hole parts (low-power red LEDs) in a metal case similar to TO-18 (with clear plastic top) that had non-rigid wire leads (again, similar to a 2N2484 transistor) without the steps.  I haven't seen them in decades, however.

--- End quote ---
JSYK you can still get some from Digikey though they are expensive, apparently they are for rather exotic sounding applications. Digikey Metal Can LEDs

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