SMD LED size for beginners

16 Nov.,2022


types of smd leds

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Many SMD LEDs are excessively fragile if hand soldered, and really need  reflowing with a well controlled temperature profile for reliability.  It is possible to hand-solder many packages but even slight pressure on the package when its hot can result in failure, and manual hot air reflow may cook the LED.  Damaged bond wires may not initially cause a problem if they are still making contact but may cause the LED to start blinking due to intermittent contact, or fail totally a considerable time later.  As such whenever manual assembly is a requirement its worth choosing a package and laying out the board for easy assembly - extra pad length so you've got room to get the iron tip on it without nudging the LED, and try to avoid small packages, and ones that have a substrate heatsinking pad under the package.