TLHR4405-AS21 Equivalent & Substitute Parts

Part Overview

The TLHR4405-AS21 is a red diffused T-1 through-hole LED manufactured by Vishay Semiconductor Opto Division, designed for LED indication applications with a dominant wavelength of 619nm and typical forward voltage of 2V at 10mA test current. This part is classified as obsolete, making identification of active equivalent and substitute components essential for ongoing production and maintenance applications. Active alternatives from Vishay and cross-manufacturer sources provide functional compatibility while offering improved availability and compliance status.

Substiute Parts

TLHR4405-AS21

Vishay Semiconductor Opto DivisionIn Stock: 1007TLHR4405-AS21 Datasheet

Current PartRFQ

TLHR4405

Vishay Semiconductor Opto DivisionIn Stock: 4276TLHR4405 Datasheet

Parametric EquivalentRFQ

TLLK4401

Vishay Semiconductor Opto DivisionIn Stock: 6493TLLK4401 Datasheet

Parametric EquivalentRFQ

TLUR4400

Vishay Semiconductor Opto DivisionIn Stock: 5443TLUR4400 Datasheet

Parametric EquivalentRFQ

TLUR4401

Vishay Semiconductor Opto DivisionIn Stock: 6030TLUR4401 Datasheet

Parametric EquivalentRFQ

WP3A8ID

KingbrightIn Stock: 2840WP3A8ID Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution eligibility for the TLHR4405-AS21 is determined by the following critical parameters:

Primary Compatibility Criteria:

• Color: Red
• Lens Transparency: Diffused
• Lens Size: 3mm, T-1
• Mounting Type: Through Hole
• Package / Case: Radial
• Voltage - Forward (Vf) (Typ): 2V (±0.2V tolerance acceptable)
• Current - Test: 10mA (±5mA tolerance acceptable)
• Viewing Angle: 60° (±10° tolerance acceptable)
• Height (Max): 6.10mm (±0.5mm tolerance acceptable)

Secondary Compatibility Criteria:

• Wavelength - Dominant: 619nm to 630nm range
• Wavelength - Peak: 635nm to 643nm range
• Millicandela Rating: 15mcd to 18mcd range

Substitute parts are grouped into two categories:

Category 1: Parametric Equivalents (Vishay TLH/TLU Series) Parts TLHR4405, TLUR4400, and TLUR4401 meet all primary compatibility criteria with identical mechanical form factors and electrical operating points. These parts maintain the same 2V forward voltage and 10mA test current specifications.

Category 2: Manufacturer-Recommended Alternative (Kingbright WP3A8ID) The WP3A8ID from Kingbright meets primary mechanical and electrical compatibility criteria but operates at 20mA test current and exhibits different optical characteristics (25mcd vs. 15mcd, 50° viewing angle vs. 60°). This part is designated as manufacturer-recommended and requires circuit validation for brightness and viewing angle requirements.

Category 3: Partial Compatibility (TLLK4401) The TLLK4401 operates at reduced forward voltage (1.8V) and test current (2mA), making it suitable only for applications where lower power consumption is acceptable and brightness reduction is tolerable.

Parameter Comparison

Engineering Selection Recommendations

Primary Recommendation: TLHR4405

The TLHR4405 is the direct parametric equivalent to TLHR4405-AS21. It maintains identical electrical specifications (2V forward voltage, 10mA test current), optical characteristics (15mcd, 60° viewing angle, 619nm dominant wavelength), and mechanical form factor (3mm T-1 radial package, 6.10mm height). The part is manufactured by Vishay Semiconductor Opto Division and carries Active product status with ROHS3 compliance and EAR99 ECCN classification. Current inventory availability is 4188 pieces.

Secondary Recommendation: TLUR4400 or TLUR4401

Both TLUR4400 and TLUR4401 provide full parametric compatibility with identical 2V forward voltage, 10mA test current, 60° viewing angle, and mechanical specifications. The primary difference is wavelength shift to 630nm dominant (640nm peak) and brightness variation (TLUR4400: 15mcd, TLUR4401: 18mcd). These parts are suitable for applications where the wavelength shift from 619nm to 630nm is acceptable. Both carry Active status, ROHS3 compliance, and strong inventory availability (5400 and 6014 pieces respectively).

Alternative Consideration: WP3A8ID (Kingbright)

The WP3A8ID is designated as manufacturer-recommended and provides mechanical compatibility but operates at 20mA test current with increased brightness (25mcd) and reduced viewing angle (50° vs. 60°). This part is suitable only for applications where higher brightness is beneficial and the narrower viewing angle does not compromise functionality. The part carries Active status and ROHS3 compliance. Height is reduced to 5.00mm, which may affect mechanical fit in some applications.

Not Recommended for Direct Substitution: TLLK4401

The TLLK4401 operates at reduced forward voltage (1.8V) and test current (2mA), resulting in significantly different circuit behavior and reduced brightness (17mcd). This part is suitable only for specialized low-power applications and is not recommended as a general substitute for the TLHR4405-AS21.

Frequently Asked Questions (FAQ)

Q: Can TLHR4405 be used as a direct replacement for TLHR4405-AS21?

A: Yes. The TLHR4405 is a parametric equivalent with identical electrical and optical specifications. The primary difference is product status (Active vs. Obsolete) and compliance certification (ROHS3 vs. RoHS non-compliant). The part is mechanically and electrically interchangeable.

Q: What is the difference between TLUR4400 and TLUR4401?

A: Both parts share identical electrical specifications (2V, 10mA) and mechanical form factors. The TLUR4401 provides slightly higher brightness (18mcd vs. 15mcd). The wavelength is identical between both parts (630nm dominant, 640nm peak). Selection depends on brightness requirements.

Q: Can WP3A8ID be used in place of TLHR4405-AS21?

A: WP3A8ID provides mechanical and basic electrical compatibility but operates at 20mA test current with increased brightness (25mcd) and reduced viewing angle (50° vs. 60°). Circuit validation is required to confirm that the higher current draw and brightness do not cause issues. The narrower viewing angle may affect visibility in some applications.

Q: Why does TLLK4401 have different electrical specifications?

A: TLLK4401 is designed for low-power indication applications with 1.8V forward voltage and 2mA test current. It is not a direct substitute for the TLHR4405-AS21 and is suitable only for specialized applications where reduced power consumption is a primary requirement.

Q: Are all substitute parts RoHS compliant?

A: All active substitute parts (TLHR4405, TLUR4400, TLUR4401, TLLK4401, WP3A8ID) carry ROHS3 compliance certification. The original TLHR4405-AS21 is RoHS non-compliant. Compliance requirements should be confirmed for your application.

Q: What is the mechanical difference between these parts?

A: All parts use identical 3mm T-1 radial packages with diffused lenses. Height specifications are 6.10mm for Vishay parts and 5.00mm for the Kingbright WP3A8ID. The 1.10mm height difference may affect mechanical fit in space-constrained applications.

Q: Can these parts be used interchangeably in existing PCB designs?

A: Yes, for through-hole designs using standard 0.100-inch pitch breadboards or PCBs. All parts use identical radial lead spacing and 3mm lens diameter. The reduced height of WP3A8ID (5.00mm vs. 6.10mm) may affect visual alignment in some applications but does not prevent electrical functionality.