WP424EDT LED Orange Diffused T-1 Through Hole Equivalent & Substitute Parts

Part Overview

The WP424EDT is an orange diffused LED indicator manufactured by Kingbright, designed for discrete indication applications in through-hole mounting configurations. This T-1 (3mm) form factor component operates at 2V forward voltage with a 4mcd brightness rating and 617nm dominant wavelength. The part is currently Active in product status with full RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are identified when equivalent electrical performance and mechanical compatibility can be maintained across different manufacturers while preserving the core functional requirements of LED indication circuits. The following substitute components meet the established parameter criteria for this application category.

Key Parameters

Parameter	WP424EDT Value	Substitution Relevance
Lens Size / Form Factor	3mm, T-1	Critical - Determines mechanical fit and mounting compatibility
Mounting Type	Through Hole Radial	Critical - Defines PCB assembly method
Voltage - Forward (Vf) Typical	2V	Critical - Determines circuit design and current limiting requirements
Current - Test	20mA	Important - Establishes operating point and brightness reference
Lens Transparency	Diffused	Important - Affects light distribution and viewing characteristics
Viewing Angle	100°	Application-dependent - Influences visibility range
Wavelength - Dominant	617nm (Orange)	Application-dependent - Color specification for indication function
Millicandela Rating	4mcd	Application-dependent - Brightness level for visibility requirements
RoHS Status	ROHS3 Compliant	Regulatory - Environmental compliance requirement
Moisture Sensitivity Level	1 (Unlimited)	Handling - Storage and assembly process compatibility

Substitute Part Grouping Explanation

Substitute parts for the WP424EDT are grouped based on strict adherence to the following electrical and mechanical parameters:

Primary Substitution Criteria (Must Match):

Mounting Type: Through Hole Radial configuration
Lens Size: 3mm T-1 form factor
Package / Case: Radial
Voltage - Forward (Vf): 2V to 2.1V range (within typical LED forward voltage tolerance)
Lens Transparency: Diffused
RoHS Status: ROHS3 Compliant
Moisture Sensitivity Level: 1 (Unlimited)

Secondary Compatibility Parameters (Allowable Variation):

Millicandela Rating: Brightness variations acceptable based on circuit design
Viewing Angle: Application-dependent selection
Wavelength: Color selection based on indication requirements
Current - Test: Operating point variations within standard LED operating ranges
Height (Max): Mechanical clearance considerations

Parts that deviate from primary substitution criteria are excluded from direct equivalency classification.

Parameter Comparison

Part Number	Manufacturer	Color	Vf (Typ)	Current Test	mcd Rating	Viewing Angle	Wavelength Dom	Lens Size	Height Max	Product Status
WP424EDT	Kingbright	Orange	2V	20mA	4mcd	100°	617nm	3mm T-1	6.00mm	Active
SLR-332DU3F	Rohm Semiconductor	Orange	2V	10mA	10mcd	85°	605nm	3.20mm	4.60mm	Not For New Designs
SLR-332YY3F	Rohm Semiconductor	Yellow	2.1V	10mA	6.3mcd	85°	587nm	3.20mm	4.60mm	Active
LTL-4251N	Lite-On Inc.	Yellow	2.1V	10mA	5.6mcd	60°	588nm	3mm T-1	5.85mm	Active
SSL-LX3044YD	Lumex Opto/Components Inc.	Yellow	2.1V	20mA	15mcd	40°	585nm	3mm T-1	4.60mm	Active
SSL-LX3044LYD	Lumex Opto/Components Inc.	Yellow	2.1V	20mA	30mcd	60°	585nm	3mm T-1	4.60mm	Active
HLMP-1719	Broadcom Limited	Yellow	1.8V	2mA	2.1mcd	50°	585nm	3mm T-1	6.35mm	Active
HLMP-1620	Broadcom Limited	Yellow	5V	10mA	2.2mcd	60°	585nm	3mm T-1	6.35mm	Active
HLMP-1621	Broadcom Limited	Yellow	12V	13mA	2.2mcd	60°	585nm	3mm T-1	6.35mm	Active
SSL-LX20465YD	Lumex Opto/Components Inc.	Yellow	2.1V	20mA	10mcd	70°	585nm	2mm T-2 Taper	5.00mm	Active

Engineering Selection Recommendations

Direct Mechanical and Electrical Equivalents (2V Forward Voltage, 3mm T-1 Form Factor):

The SLR-332DU3F (Rohm Semiconductor) represents the closest electrical equivalent with matching 2V forward voltage and orange color specification. However, this part carries "Not For New Designs" product status, indicating manufacturer discontinuation trajectory. The SLR-332DU3F maintains RoHS3 compliance and MSL-1 rating, supporting direct substitution in existing production environments where design freeze conditions apply.

Active Production Alternatives (2.1V Forward Voltage, 3mm T-1 Form Factor):

The LTL-4251N (Lite-On Inc.) and SSL-LX3044 series (Lumex Opto/Components Inc.) operate at 2.1V forward voltage, representing a 0.1V increase from the WP424EDT specification. This voltage differential falls within standard LED forward voltage tolerance bands and requires circuit validation for current-limiting resistor adjustment. All three parts maintain Active product status with full RoHS3 and MSL-1 compliance.

The SSL-LX3044LYD provides the highest brightness rating (30mcd) among 2.1V alternatives, suitable for applications requiring enhanced visibility. The SSL-LX3044YD offers moderate brightness (15mcd) with narrower viewing angle (40°), appropriate for directed indication applications.

Voltage-Variant Alternatives (1.8V and 5V-12V Options):

The HLMP-1719 series (Broadcom Limited) operates at 1.8V, enabling lower-power circuit designs with reduced current draw (2mA test current). This variant requires circuit redesign for voltage compatibility but maintains mechanical form factor equivalency.

The HLMP-1620 (5V) and HLMP-1621 (12V) variants support higher-voltage circuit architectures. These parts are suitable only for applications where forward voltage matching is not a primary constraint and circuit topology permits voltage adaptation.

Non-Equivalent Form Factor (2mm T-2 Taper):

The SSL-LX20465YD represents a different mechanical form factor (2mm T-2 Taper body) and is not recommended as a direct substitute due to mounting incompatibility with T-1 through-hole PCB layouts.

Frequently Asked Questions (FAQ)

Q: Can the SLR-332DU3F be used as a direct replacement for the WP424EDT in new designs?

A: No. The SLR-332DU3F carries "Not For New Designs" product status from Rohm Semiconductor, indicating the manufacturer is discontinuing this part. While electrical and mechanical parameters are compatible, new designs should utilize Active status alternatives such as the LTL-4251N or SSL-LX3044 series to ensure long-term supply availability.

Q: What is the impact of the 0.1V forward voltage difference between WP424EDT (2V) and LTL-4251N (2.1V)?

A: The 0.1V difference falls within standard LED forward voltage tolerance specifications and does not prevent substitution. However, circuit validation is required. The current-limiting resistor value may require adjustment to maintain the intended brightness level at the specified test current. Recalculation using Ohm's law (R = (Vsupply - Vf) / I) is necessary for each specific circuit configuration.

Q: Are the Broadcom HLMP-1620 and HLMP-1621 parts suitable substitutes?

A: The HLMP-1620 (5V) and HLMP-1621 (12V) are not direct substitutes due to significantly different forward voltage specifications. These parts require complete circuit redesign and are only applicable in applications where the power supply voltage and circuit topology can accommodate higher forward voltage operation. Direct substitution without circuit modification will result in incorrect brightness or component failure.

Q: What is the difference between SSL-LX3044YD and SSL-LX3044LYD?

A: Both parts share identical electrical specifications (2.1V, 20mA test current, 3mm T-1 form factor, Active status). The primary difference is brightness rating: SSL-LX3044YD provides 15mcd with 40° viewing angle, while SSL-LX3044LYD provides 30mcd with 60° viewing angle. Selection depends on application visibility requirements and viewing angle constraints.

Q: Can the SSL-LX20465YD (2mm T-2 Taper) be used in place of the WP424EDT?

A: No. The SSL-LX20465YD uses a different mechanical form factor (2mm T-2 Taper body) that is incompatible with standard 3mm T-1 through-hole PCB layouts. Mechanical interference and mounting misalignment will occur. This part is not a suitable substitute.

Q: What compliance certifications should be verified when selecting a substitute part?

A: All listed substitute parts maintain RoHS3 compliance and MSL-1 (Unlimited) moisture sensitivity rating, matching the WP424EDT specifications. REACH Unaffected and EAR99 ECCN classifications are consistent across all alternatives. No additional compliance verification is required beyond standard component qualification procedures.

Q: How does the viewing angle affect substitution decisions?

A: Viewing angle is application-dependent and does not prevent substitution from an electrical standpoint. The WP424EDT provides 100° viewing angle, while alternatives range from 40° to 85°. Narrower viewing angles (40°-60°) concentrate light intensity for directed indication, while wider angles (85°-100°) provide broader visibility. Circuit placement and visibility requirements determine acceptable viewing angle ranges for each application.

Q: Is color substitution (orange to yellow) acceptable?

A: Color substitution is application-dependent and not an automatic equivalency criterion. The WP424EDT specifies orange (617nm dominant wavelength), while most alternatives are yellow (585nm-588nm). Color substitution is only acceptable if the application permits yellow indication in place of orange. Regulatory or functional requirements may mandate specific color specifications that prevent yellow alternatives from being used.

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