TLLG4400 Equivalent & Substitute Parts

Part Overview

The TLLG4400 is a green diffused T-1 through-hole LED manufactured by Vishay Semiconductor Opto Division. This discrete indication LED operates at 1.9V forward voltage with a dominant wavelength of 569nm and delivers 1.2mcd luminous intensity. The part is Active status and ROHS3 compliant, suitable for standard indicator applications requiring green light emission in compact 3mm form factors.

Substitute parts are identified to address inventory availability, performance requirements, or design optimization needs while maintaining compatibility with T-1 through-hole mounting and green wavelength specifications.

Substiute Parts

TLLG4400

Vishay Semiconductor Opto DivisionIn Stock: 6073TLLG4400 Datasheet

Current PartRFQ

SLI-343M8G3F

Rohm SemiconductorIn Stock: 2287SLI-343M8G3F Datasheet

MFR RecommendedRFQ

SLI-343P8G3F

Rohm SemiconductorIn Stock: 15941SLI-343P8G3F Datasheet

MFR RecommendedRFQ

WP710A10SGD

KingbrightIn Stock: 4066WP710A10SGD Datasheet

MFR RecommendedRFQ

WP710A10SGD5V

KingbrightIn Stock: 1462WP710A10SGD5V Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TLLG4400 is determined by the following criteria:

Primary Compatibility Requirements:

• Color: Green
• Lens Transparency: Diffused
• Mounting Type: Through Hole
• Package / Case: Radial
• Supplier Device Package: T-1

Secondary Compatibility Parameters:

• Wavelength - Dominant: 560nm to 572nm range (green spectrum)
• Lens Style: Round with Domed Top
• RoHS Status: ROHS3 Compliant
• Product Status: Active

Performance Variation Allowances:

• Voltage - Forward (Vf): 1.9V to 5V (circuit design dependent)
• Current - Test: 2mA to 20mA (application specific)
• Millicandela Rating: 1.2mcd to 150mcd (brightness requirement dependent)
• Viewing Angle: 40° to 50° (application dependent)
• Height (Max): 5.60mm to 6.10mm (PCB clearance dependent)

All substitute parts listed maintain Active product status and ROHS3 compliance, ensuring regulatory and supply chain continuity.

Parameter Comparison

Engineering Selection Recommendations

SLI-343M8G3F (Rohm EXCELED™ Series)

• Highest brightness option at 150mcd
• Forward voltage 2.2V requires circuit resistor adjustment from 1.9V design
• Wavelength 572nm within green spectrum tolerance
• Reduced viewing angle 40° versus 50° original
• Lower profile 5.60mm height provides additional PCB clearance
• ROHS3 compliant, Active status

SLI-343P8G3F (Rohm EXCELED™ Series)

• Moderate brightness 22mcd, closest to original 1.2mcd performance envelope
• Forward voltage 2.2V requires circuit resistor adjustment
• Wavelength 560nm within green spectrum tolerance
• Reduced viewing angle 40° versus 50° original
• Lower profile 5.60mm height provides additional PCB clearance
• ROHS3 compliant, Active status
• Highest inventory availability at 15,920 pieces

WP710A10SGD (Kingbright)

• Brightness 40mcd, moderate increase from original
• Forward voltage 2.2V requires circuit resistor adjustment
• Wavelength 568nm closely matches original 569nm
• Reduced viewing angle 40° versus 50° original
• Height 5.90mm maintains near-original profile
• ROHS3 compliant, Active status

WP710A10SGD5V (Kingbright)

• Brightness 25mcd, moderate increase from original
• Forward voltage 5V for direct 5V supply applications
• Wavelength 568nm closely matches original 569nm
• Reduced viewing angle 40° versus 50° original
• Height 5.90mm maintains near-original profile
• ROHS3 compliant, Active status
• Limited inventory at 1,408 pieces

Frequently Asked Questions (FAQ)

Q: Can I directly replace TLLG4400 with any of these substitute parts? A: Direct replacement requires circuit evaluation. All substitutes maintain T-1 through-hole radial mounting and green diffused lens specifications. However, forward voltage differences (1.9V original versus 2.2V or 5V substitutes) necessitate resistor value recalculation to maintain proper LED current. WP710A10SGD5V is suitable only for 5V supply circuits.

Q: What is the primary difference between SLI-343M8G3F and SLI-343P8G3F? A: Both are Rohm EXCELED™ series with identical electrical specifications (2.2V, 20mA test current, 40° viewing angle, 5.60mm height). The primary difference is brightness: SLI-343M8G3F delivers 150mcd while SLI-343P8G3F delivers 22mcd. Selection depends on required luminous intensity for the application.

Q: How do wavelength differences affect substitution? A: All substitute parts emit green light within the 560nm to 572nm range. The original TLLG4400 operates at 569nm dominant wavelength. Wavelength variations within this green spectrum range produce visually consistent green indication with no functional impact on standard indicator applications.

Q: Are there height clearance concerns with substitute parts? A: The original TLLG4400 has 6.10mm maximum height. SLI-343M8G3F and SLI-343P8G3F are 5.60mm, providing 0.50mm additional clearance. WP710A10SGD and WP710A10SGD5V are 5.90mm, providing 0.20mm additional clearance. All substitutes fit within standard PCB clearance envelopes for T-1 through-hole components.

Q: What viewing angle impact should I consider? A: The original TLLG4400 has 50° viewing angle. All substitutes have 40° viewing angle, a 10° reduction. This narrower cone of light may affect visibility in applications requiring wide-angle indication. Evaluate specific application requirements before selection.

Q: Which substitute offers the closest electrical match to TLLG4400? A: WP710A10SGD provides the closest match: 2.2V forward voltage (0.3V increase), 568nm wavelength (1nm difference from 569nm), and 40mcd brightness with moderate increase. Circuit resistor adjustment is required due to forward voltage difference.

Q: Can I use WP710A10SGD5V in a 2V circuit? A: No. WP710A10SGD5V is specified for 5V supply circuits with 11.5mA test current. Using this part in a 2V circuit will result in insufficient forward voltage and non-functional LED operation.