ELM21553GD

Series:	ELM2
Packaging:	Tray
Lead Free Status / RoHS Status:	--
Part Status:	Active
Moisture Sensitivity Level (MSL):	--
Color:	Green
Wavelength - Peak:	568nm
Configuration:	Single
Current:	30mA
Millicandela Rating:	25mcd
Viewing Angle:	35°
Lens Type:	Diffused, Tinted
Lens Style/Size:	Round with Domed Top, 3mm (T-1)
Voltage Rating:	2.1V
Mounting Type:	Through Hole

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ELM21553GD Application Field and Working Principle

The ELM21553GD is a semiconductor device that belongs to an extensive range of LEDs – Circuit Board Indicators, Arrays, Light Bars, Bar Graphs. The ELM21553GD is a small, surface mounted LED that emits a very bright light in response to an applied voltage or current. It is commonly used as an indicator light on circuit boards, as a backlight in LCD displays, as status indicators on switch panels, and a variety of other applications.The ELM21553GD is composed of two components; the semiconductor chip itself and a package that serves as a mechanical protector, heat sink, and as a lens to direct the light output. The semiconductor chip contains two layers of doped material – an “N”-type layer and a “P”-type layer – making it a PN junction. When a voltage or current is applied across the PN junction, the semiconductor absorbs energy. This energy is then released in the form of a photon, or light particle, which is then amplified by the mechanical and optical components of the package.The ELM21553GD is available in several colors and brightness levels. Typically, the light output is measured in millicandelas (mcd). The range of colors offered includes white, green, red, amber, blue, and yellow. Depending on the voltage or current applied, the brightness levels range from 1.5 mcd to 2800 mcd. The ELM21553GD can be powered by either direct current (DC) or alternating current (AC). For DC applications, the voltage required depends on the brightness level desired. Generally, if the current is applied to the PN junction, the brightness will increase with higher voltages. For AC applications, a bridge rectifier is used to convert the AC voltage to a safe DC voltage. The ELM21553GD has two commonly used mounting methods; solder and press-fit. For the solder mounting method, the LED is soldered directly to the board. For the press-fit, a holder is installed onto the board and the LED is pressed into place. Depending on the application, a third option – leadless chip carriers – can also be used.In summary, the ELM21553GD is a versatile LED that can be used for a variety of applications. It is composed of a semiconductor chip, optics, and a mechanical protector to protect against impact and temperature changes. The ELM21553GD emits a bright light for either DC or AC applications, and there are several colors and brightness levels available. Finally, its two most popular mounting methods are solder and press-fit.

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