TLLG4401-AS12Z Equivalent & Substitute Parts

Part Overview

The TLLG4401-AS12Z is a green diffused T-1 (3mm) through-hole LED manufactured by Vishay Semiconductor Opto Division, designed for LED indication applications with a dominant wavelength of 569nm. This part is classified as obsolete, making identification of suitable substitute components essential for ongoing production, maintenance, and design updates. The original part specifications include a forward voltage of 1.9V at 2mA test current, 2mcd brightness rating, and a 50° viewing angle. Due to its obsolete status and limited availability relative to active alternatives, equivalent parts from current manufacturers provide viable replacements while maintaining functional compatibility.

Substiute Parts

TLLG4401-AS12Z

Vishay Semiconductor Opto DivisionIn Stock: 878TLLG4401-AS12Z Datasheet

Current PartRFQ

HLMP-1790-A0002

Broadcom LimitedIn Stock: 26218HLMP-1790-A0002 Datasheet

DirectRFQ

5219210F

DialightIn Stock: 47655219210F Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitute parts for the TLLG4401-AS12Z are qualified based on strict alignment with the following critical parameters:

• Color and Wavelength: All substitutes must be green LEDs with dominant wavelength in the 568–569nm range to ensure color consistency and application compatibility.
• Lens Configuration: Substitutes must feature a 3mm T-1 diffused lens with round domed top to maintain identical optical and mechanical form factors.
• Mounting Type: All substitutes must be through-hole radial packages to ensure PCB compatibility without redesign.
• Electrical Characteristics: Forward voltage and test current must remain within acceptable circuit design tolerances. Variations in Vf and brightness (mcd) are permissible provided the part operates within the same general application envelope.
• Physical Dimensions: Height and overall package dimensions must be compatible with existing PCB layouts and mechanical assemblies.

The two identified substitutes—HLMP-1790-A0002 (Broadcom) and 5219210F (Dialight)—meet these criteria while offering the advantage of active product status and improved availability.

Parameter Comparison

Engineering Selection Recommendations

HLMP-1790-A0002 (Broadcom Limited) is the primary substitute for direct replacement applications. This part maintains identical electrical characteristics (1.9V Vf, 2mA test current) and optical parameters (569nm dominant wavelength, 50° viewing angle) to the original TLLG4401-AS12Z. The HLMP-1790-A0002 is ROHS3 compliant and carries active product status with substantial inventory availability (26,157 pcs), ensuring long-term supply chain stability. Physical dimensions are compatible, with a maximum height of 6.35mm compared to the original 6.10mm, representing a negligible difference for standard through-hole PCB applications.

5219210F (Dialight) serves as an alternative substitute where higher brightness output is acceptable or beneficial. This part operates at 2.1V forward voltage and 10mA test current, with a significantly higher brightness rating of 12.6mcd compared to the original 2mcd. The dominant wavelength remains within specification at 568nm, and the physical form factor is compatible. The 5219210F is ROHS3 compliant and actively manufactured. Circuit design modifications may be required to accommodate the higher forward voltage and test current; existing current-limiting resistor values should be recalculated to ensure proper operation at the intended brightness level.

Both substitutes are ROHS3 compliant, addressing regulatory requirements that the original obsolete part does not meet. Selection between these two options depends on brightness requirements and circuit design flexibility.

Frequently Asked Questions (FAQ)

Q: Can HLMP-1790-A0002 be used as a direct drop-in replacement for TLLG4401-AS12Z?

A: Yes. The HLMP-1790-A0002 matches the original part in forward voltage (1.9V), test current (2mA), dominant wavelength (569nm), viewing angle (50°), and physical form factor (3mm T-1 diffused lens, through-hole radial package). No circuit modifications are required.

Q: What are the key differences between HLMP-1790-A0002 and 5219210F?

A: The primary differences are forward voltage (1.9V vs. 2.1V), test current (2mA vs. 10mA), and brightness rating (2.3mcd vs. 12.6mcd). The HLMP-1790-A0002 is the closer electrical match to the original part. The 5219210F offers higher brightness and a wider viewing angle (60° vs. 50°) but requires circuit design adjustments for the higher voltage and current specifications.

Q: Are both substitute parts compatible with existing PCB layouts designed for TLLG4401-AS12Z?

A: Yes. Both substitutes use identical 3mm T-1 through-hole radial packages with compatible lead configurations. Physical dimensions are within acceptable tolerances for standard PCB assemblies. The HLMP-1790-A0002 height of 6.35mm and 5219210F height of 6.00mm are both compatible with the original 6.10mm specification.

Q: Do the substitute parts meet current regulatory requirements?

A: Yes. Both HLMP-1790-A0002 and 5219210F are ROHS3 compliant and REACH unaffected, addressing modern regulatory standards. The original TLLG4401-AS12Z is RoHS non-compliant, making substitution necessary for new designs or updated production runs subject to RoHS requirements.

Q: If I select 5219210F, what circuit modifications are necessary?

A: The 5219210F operates at 2.1V forward voltage and 10mA test current compared to the original 1.9V and 2mA. Recalculate the current-limiting resistor value using Ohm's law: R = (Supply Voltage − Vf) / I. For example, with a 5V supply, the original resistor would be (5V − 1.9V) / 2mA = 1.55kΩ, while the 5219210F would require (5V − 2.1V) / 10mA = 290Ω. Verify that the new resistor value is available in standard series and that the resistor power rating is adequate.

Q: What is the inventory status of these substitute parts?

A: HLMP-1790-A0002 has 26,157 pcs in stock. 5219210F has 4,730 pcs in stock. Both parts are actively manufactured and available through standard distribution channels, providing reliable long-term supply compared to the obsolete TLLG4401-AS12Z.