SMD LEDS, An Ideal Choice for Membrane Switches

PublishTime： 2021-06-30 Article Source：Nicomatic

Nicomatic Light Emitting Diodes (LEDs) are extremely thin – with a height of 0.5mm or 0.35mm to select from – and in a total size of 3.2 x 1.6 x 0.5mm or 0.35mm (3.2 x 2.5 x 0.5mm or 0.35mm in bi-color). They are an ideal choice for membrane switches as their small height reduces the thickness of the layer and eliminates embossing, which in turn decreases the cost of the membrane switch total construction. They are widely used in white goods and domotics, printed electronic & keyboards, medical, consumer electronics, and civil avionics.

Electrostatic Discharge (ESD) can cause damage to unprotected electronic devices even when the discharge can be at times imperceptible. Even though all LEDs are susceptible to ESD damage it is the GaN-based LEDs (blue, white, and some green colors) that are more sensitive to surge voltages caused by ESD.

Ratings for Nicomatic UltraThin SMD LEDs are per industry standards with Red, Yellow, Green, and Orange at 2000V ESD and blue and white at 150V ESD.

Nicomatic does offer an alternative ruggedized version of our UltraThin Blue SMD LED, designated as ZHB55W-05 with an ESD rating of 1000 Volts.

Damage can vary in its degree, from very subtle to catastrophic, and invariably will affect the LEDs' performance and life. This can show up in some unusual operating characteristics such as; increased reverse leakage current, changes to the forward voltage, increase in the "turning on" point (not lighting at low currents), flickering, erratic behavior or performance, etc.

Nicomatic recommends that all personnel, devices, equipment, instruments, and machinery be properly grounded at all times. Anti-electronic wristbands and electrically conductive mats, ionizing fans should be used when handling LED products and tests to ensure that the proper and true grounding indeed exists from the equipment that handles, touches and mounts LED lamps.

Electrostatic buildup occurs (and or increases) easily in dry environmental conditions (low relative humidity). Relative humidity of 50% or higher is recommended for electronic components manufacturing environments. Be careful when RH drops below 50%.

General features:

(1) Easy to place standard package (1206 & 1210 for bicolor)

(2) Reel with 8mm dimension for P&P automatic devices

(3) Available mostly from stock

(4) Can be run at low currents

(5) ESD value at 2000V for 0.35mm LEDs

(6) 21 P/Ns to choose from

(7) Use temperature from -30°C to +80°C

(8) Shelf life of minimum 12 months in a sealed bag

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