TLHF4902

Current - Test:	10mA
Base Part Number:	TLH4902
Height (Max):	6.40mm
Size / Dimension:	--
Supplier Device Package:	3mm
Package / Case:	Radial
Features:	--
Wavelength - Peak:	610nm
Wavelength - Dominant:	606nm
Mounting Type:	Through Hole
Viewing Angle:	32°
Series:	--
Voltage - Forward (Vf) (Typ):	1.9V
Lens Style/Size:	Round with Domed Top, 3mm (T-1), 3.20mm
Millicandela Rating:	440mcd
Lens Transparency:	Clear
Lens Color:	--
Color:	Orange
Moisture Sensitivity Level (MSL):	--
Part Status:	Active
Lead Free Status / RoHS Status:	--
Packaging:	Bulk

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Introduction

The TLHF4902 is a two-pin surface-mount device designed to indicate the presence of a discrete input by lighting an indicator LED. It is noted for its low profile and its simple integration into existing circuit designs. The TLHF4902 is favored for discretes for which a more sophisticated solution would be costly or technically demanding.

TLHF4902 Application Field

The simplest usage of the TLHF4902 is in a low-status indication. That is, when a discrete input is off or not active, the LED remains unlit. However, when the discrete is switched on, the LED illuminates, indicating the presence of the active discrete. It can also be used as a “status-bar” across a larger system, providing a visual indication that all discrete components are working correctly. Due its low power requirements, the TLHF4902 is also useful in embedded applications, such as circuit boards that utilize a battery power supply. Low power requirements mean a longer battery life, money savings and the peace of mind that comes from knowing it won’t draw too heavily from its power source.

TLHF4902 Working Principle

The TLHF4902 operates by passing a current through its two-pin header. When a discrete input is made, the voltage across the two pins rises, driving current through the circuit, which lights the LED. This mechanism is simple and reliable, providing years of trouble-free operation in even the harshest environments.The TLHF4902 is also extremely reliable, owing to its well-designed circuitry. It is designed to respond only to an active discrete, and will not light the LED in response to a false or spurious input. This makes it ideal for use in fields such as medical diagnostics, where reliability and safety are paramount.

Conclusion

The TLHF4902 is an ideal solution for discrete input indications. Its low profile and simple integration make it perfect for projects that require a discrete indicator but need to minimize their power and space requirements. The TLHF4902 is also reliable and responds only to active discretes, making it suitable for use in extreme environments. For discrete applications that don’t require a more complex solution, the TLHF4902 is the perfect choice.

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