HLMPQ155AYR Optoelectronics

Current - Test:	1mA
Base Part Number:	HLMPQ155A
Height (Max):	2.92mm
Size / Dimension:	2.20mm L x 2.10mm W
Supplier Device Package:	Yoke Lead
Package / Case:	2-SMD, Yoke Bend
Features:	--
Wavelength - Peak:	660nm
Wavelength - Dominant:	--
Mounting Type:	Surface Mount
Viewing Angle:	25°
Series:	--
Voltage - Forward (Vf) (Typ):	1.6V
Lens Style/Size:	Round with Domed Top, 1.75mm
Millicandela Rating:	4mcd
Lens Transparency:	Clear
Lens Color:	Colorless
Color:	Red
Moisture Sensitivity Level (MSL):	--
Part Status:	Obsolete
Lead Free Status / RoHS Status:	--
Packaging:	Tape & Reel (TR)

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LED Indication - Discrete

LEDs, or Light Emitting Diodes, are electronic components used to emit light. In the case of the HLMPQ155AYR, it is a type of discrete (individual or independent) LED that is typically employed in applications where small built-in illumination or a display indicator is required. For example, this product family is often used in alarm systems, on/off switch indicator lights, operating status indicators, and so forth. The HLMPQ155AYR is one of many such discrete indicator components.The HLMPQ155AYR is an LED in an attractive red housing, which contains three internal components: a dielectric filter, one red LED and an infrared filter. The filter is tuned to allow only light emitted by the red LED to pass through it, which creates the pure red package color desired by designers. The infrared filter helps protect the appearance of the package from the intense infrared light generated by the red LED. The dielectric filter is designed to reduce light bleed throughout the package, as well as improving light intensity and beam control. The key feature of the HLMPQ155AYR is its wide angle emission. This is largely due to its special design which consists of three optical elements — the dielectric filter, the red LED, and the infrared filter — all contained within a 2-3 degree cone. The several optical elements allow for a wide angle of emission from the HLMPQ155AYR as it can focus a narrow beam of light while at the same time emitting a larger area of visible details to the user. The beam of light produced is up to approximately 145° depending on the position of the LED. This wide angle can be utilized to make a unique focus area without stray light and without turning the LED off and on, which is how its bright white light is utilized most effectively.When considering its working principle, the HLMPQ155AYR is essentially a light-producing semiconductor with one p-type semiconductor layer and one n-type semiconductor layer. A positive voltage is applied to the anode, which causes current to flow through the junction of the two semiconductor layers. This current flow generates a steady stream of photons, the particles that make up light. The photons then travel through the filter, the LED and the infrared filter to the user, thus creating a bright and focused light in a particular area without any stray light.The HLMPQ155AYR is an extremely valuable LED offering unique lighting characteristics. With its bright white light, wide angle of emission, and narrow focused beams, the HLMPQ155AYR is commonly used in applications such as alarm systems, on/off switch indicator lights, and operating status indicators, as well as many other applications requiring small built-in illumination with a display indicator. Its design, containing a dielectric filter, one red LED, and an infrared filter allows for much precision in terms of the amount of light emitted and the beam used. Additionally, its wide angle of emission offers a lot of flexibility in illumination, allowing designers to make a focused area with minimal stray light, often without turning any LED’s off or on. Understanding the working principle of the HLMPQ155AYR and its sophisticated optical design allows for maximum efficiency in many different applications requiring discrete LED indication.

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