TLHB44K2M1 Equivalent & Substitute Parts

Part Overview

The TLHB44K2M1 is a blue diffused T-1 through-hole LED manufactured by Vishay Semiconductor Opto Division, designed for indication applications with a dominant wavelength of 466nm and a typical forward voltage of 3.8V at 10mA test current. This component is classified as obsolete, making identification of functionally equivalent substitute parts essential for ongoing design support and production continuity.

Substiute Parts

TLHB44K2M1

Vishay Semiconductor Opto DivisionIn Stock: 1013TLHB44K2M1 Datasheet

Current PartRFQ

5219831F

DialightIn Stock: 22485219831F Datasheet

MFR RecommendedRFQ

SSL-LX305F6USBD

Lumex Opto/Components Inc.In Stock: 716SSL-LX305F6USBD Datasheet

MFR RecommendedRFQ

SSL-LX30FT4USBD

Lumex Opto/Components Inc.In Stock: 1131SSL-LX30FT4USBD Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TLHB44K2M1 are selected based on the following critical parameters that define functional equivalence:

• Color: Blue (all substitutes match)
• Lens Transparency: Diffused (all substitutes match)
• Mounting Type: Through Hole Radial (all substitutes match)
• Lens Style: Round with Domed Top (all substitutes match)
• Lens Size: 3mm T-1 form factor (all substitutes match or are compatible)
• Voltage Range: Forward voltage between 4.6V and 3.8V (acceptable for indication circuits)
• Wavelength: Blue spectrum 465nm–470nm (within acceptable blue LED range)
• RoHS Compliance: ROHS3 Compliant (all substitutes match)

The three identified substitute parts meet these core criteria while maintaining through-hole radial package compatibility and blue diffused lens characteristics required for direct replacement in indication applications.

Parameter Comparison

Engineering Selection Recommendations

5219831F (Dialight 521 Series)

This substitute maintains the closest electrical and mechanical alignment with the TLHB44K2M1. Forward voltage is 0.3V lower (4.6V vs. 3.8V), and millicandela rating is slightly lower (13.15mcd vs. 15mcd), making it suitable for applications where the original brightness and voltage characteristics are not critical constraints. The part is active and ROHS3 compliant with unlimited moisture sensitivity rating. Lens size is marginally smaller (2.80mm vs. 3mm), which may require minor mechanical accommodation in tight PCB layouts.

SSL-LX305F6USBD (Lumex Opto/Components)

This substitute offers significantly higher brightness (80mcd vs. 15mcd) and operates at 4.6V forward voltage with a 20mA test current. The 3mm lens diameter and 60° viewing angle match the original specification closely. This option is suitable for applications requiring enhanced visibility or where the increased brightness does not create design conflicts. Product is active and ROHS3 compliant.

SSL-LX30FT4USBD (Lumex Opto/Components)

This substitute provides the widest viewing angle (100° vs. 60°) among available options, with the same 80mcd brightness and 4.6V forward voltage as the SSL-LX305F6USBD. The T-1 package designation and 3mm lens size provide direct mechanical compatibility. This option is optimal for applications requiring wide-angle visibility. Product is active, ROHS3 compliant, and has unlimited moisture sensitivity rating.

All three substitutes are currently in active production status, ensuring long-term availability and supply chain stability compared to the obsolete TLHB44K2M1.

Frequently Asked Questions (FAQ)

Q: Can the 5219831F be used as a direct drop-in replacement for the TLHB44K2M1?

A: The 5219831F is mechanically compatible as a through-hole radial mount blue diffused LED. The 0.3V lower forward voltage (4.6V vs. 3.8V) is within acceptable tolerance for indication circuits. The slightly smaller lens diameter (2.80mm vs. 3mm) may require verification in space-constrained layouts. Electrical circuit validation is recommended for applications with tight voltage or current specifications.

Q: What is the primary difference between the two Lumex options (SSL-LX305F6USBD and SSL-LX30FT4USBD)?

A: Both Lumex parts share identical electrical specifications (4.6V, 20mA test, 80mcd brightness, 470nm peak wavelength). The primary difference is viewing angle: SSL-LX305F6USBD provides 60° viewing angle matching the original TLHB44K2M1, while SSL-LX30FT4USBD provides 100° wide-angle viewing. Select based on required field of view for your application.

Q: Why do the Lumex substitutes have higher millicandela ratings than the original part?

A: The Lumex parts are specified at 20mA test current, compared to 10mA for the TLHB44K2M1. Higher brightness at elevated current is a characteristic of these LED designs. Circuit design must accommodate the 20mA current requirement if these parts are selected.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. The TLHB44K2M1 and all three substitute parts (5219831F, SSL-LX305F6USBD, SSL-LX30FT4USBD) are ROHS3 compliant and REACH unaffected, meeting current environmental and regulatory requirements.

Q: What is the impact of the different peak wavelengths (428nm vs. 470nm)?

A: Both wavelengths fall within the blue LED spectrum. The TLHB44K2M1 and 5219831F peak at 428nm (shorter wavelength, more violet-blue appearance), while the Lumex parts peak at 470nm (longer wavelength, more pure blue appearance). Visual perception differences are minimal in indication applications; selection should be based on specific color matching requirements if the application is color-critical.

Q: Can these substitutes be used interchangeably in the same circuit?

A: Circuit compatibility depends on forward voltage tolerance and current handling capability. The 0.3V difference between the TLHB44K2M1 (3.8V) and substitutes (4.6V) may require resistor value adjustment in current-limiting circuits. The Lumex parts require 20mA vs. 10mA, necessitating circuit redesign. Electrical validation is required before interchangeable use.