MT121L-YL

LED Indication - Discrete Overview

The MT121L-YL is a general-purpose yellow light-emitting diode manufactured by Marktech Optoelectronics. It features a 5.5mm round lens with a domed top, designed for through-hole mounting. The device operates at a typical forward voltage of 5.8V and a test current of 20mA. Its peak emission wavelength is 585nm, classifying it as a high-brightness indicator suitable for visual signaling applications.

LED Indication - Discrete Feature Summary

• High luminance output for clear visual indication
• Durable through-hole construction with white ceramic base
• Wide radiation pattern for broad visibility

LED Indication - Discrete Applications

• Currency validation systems
• Medical and biofluorescence instrumentation
• General equipment status indication
• Push button backlighting

LED Indication - Discrete Procurement Notes

Verify the specific datasheet version to confirm electrical tolerances and optical characteristics. Ensure compatibility with standard through-hole PCB layouts. Confirm that the 5.8V forward voltage aligns with the system's power supply constraints. Check for RoHS compliance requirements if applicable to the final assembly.

LED Indication - Discrete Selection Notes

Select this component when a high-brightness yellow indicator is required in a 5.5mm form factor. The 585nm peak wavelength provides distinct visibility. Consider the 20mA operating current for driver circuit design. The through-hole package offers robust mechanical stability compared to surface-mount alternatives.

LED Indication - Discrete Part Context

This part belongs to the MT121NP series of multi-chip emitters from Marktech Optoelectronics. While the broader series supports various wavelengths and custom sorting, the MT121L-YL specifically denotes the yellow variant. It shares the high-reliability construction and wide radiation pattern characteristics of the family.

LED Indication - Discrete Replacement Considerations

Direct substitutes include other 5.5mm yellow LEDs with similar 5.8V forward voltage and 20mA current ratings. Verify mechanical dimensions and pin spacing to ensure fit within existing through-hole footprints.