WP36BYD LED Yellow Diffused T-1 Through-Hole Equivalent & Substitute Parts

Part Overview

The WP36BYD is a yellow diffused LED indicator manufactured by Kingbright, designed for discrete 14V radial through-hole applications. This T-1 3mm component operates at 588nm dominant wavelength with 15mcd brightness rating and features a 60° viewing angle. The part is currently in active product status with 952 units in stock inventory.

Equivalent and substitute parts are necessary when the WP36BYD becomes unavailable, when alternative voltage ratings are required for circuit redesign, or when different brightness levels are needed for specific application requirements. Substitute selection must maintain compatibility with through-hole mounting, T-1 form factor, and yellow color specification while accommodating variations in forward voltage, millicandela rating, and viewing angle within acceptable design parameters.

Key Parameters

Parameter	WP36BYD Value	Substitution Relevance
Manufacturer	Kingbright	OEM identification
Color	Yellow	Critical - must match
Lens Transparency	Diffused	Critical - must match
Lens Size / Form Factor	3mm T-1	Critical - mechanical compatibility
Mounting Type	Through Hole Radial	Critical - PCB assembly method
Voltage - Forward (Vf) Typical	14V	Major - circuit design dependent
Wavelength - Dominant	588nm	Major - color specification
Millicandela Rating	15mcd	Major - brightness requirement
Viewing Angle	60°	Minor - application dependent
Height Maximum	5.00mm	Minor - PCB clearance
RoHS Status	ROHS3 Compliant	Regulatory requirement
Moisture Sensitivity Level	1 (Unlimited)	Storage and handling

Substitute Part Grouping Explanation

Substitute parts for the WP36BYD are grouped based on strict compatibility with the following critical parameters:

Critical Matching Parameters (Non-Negotiable):

Color: Yellow
Lens Transparency: Diffused
Lens Size: 3mm T-1 form factor
Mounting Type: Through-hole radial configuration
Package/Case: Radial

Major Variation Parameters (Application-Dependent):

Voltage - Forward (Vf): The WP36BYD operates at 14V. Substitutes may operate at different voltage ratings (1.8V, 2.1V, 5V, 12V) depending on circuit requirements and available power supply rails.
Millicandela Rating: The WP36BYD provides 15mcd. Substitutes range from 2.1mcd to 8.7mcd, affecting visibility and brightness performance.
Wavelength - Dominant: The WP36BYD specifies 588nm. Acceptable substitutes maintain yellow spectrum (585nm-590nm range).

Minor Variation Parameters (Design Flexibility):

Viewing Angle: The WP36BYD provides 60°. Substitutes range from 40° to 85°, affecting directional visibility.
Height: The WP36BYD maximum height is 5.00mm. Substitutes range from 4.60mm to 8.60mm, requiring PCB clearance verification.

Regulatory Compliance (Required):

RoHS3 Compliance: All listed substitutes maintain ROHS3 compliance
Moisture Sensitivity Level: All listed substitutes are MSL 1 (Unlimited)

Parameter Comparison

Part Number	Manufacturer	Color	Lens Size	Vf (Typ)	mcd Rating	Wavelength (nm)	Viewing Angle	Height Max (mm)	Product Status
WP36BYD	Kingbright	Yellow	3mm T-1	14V	15mcd	588nm	60°	5.00	Active
HLMP-1620	Broadcom Limited	Yellow	3mm T-1	5V	2.2mcd	585nm	60°	6.35	Active
HLMP-1621	Broadcom Limited	Yellow	3mm T-1	12V	2.2mcd	585nm	60°	6.35	Active
HLMP-1719	Broadcom Limited	Yellow	3mm T-1	1.8V	2.1mcd	585nm	50°	6.35	Active
HLMP-1719-A0002	Broadcom Limited	Yellow	3mm T-1	1.8V	2.1mcd	585nm	50°	6.35	Active
LTL-307YLC	Lite-On Inc.	Yellow	5mm T-1 3/4	1.8V	3.7mcd	588nm	50°	8.60	Active
LTL-4251	Lite-On Inc.	Yellow	3mm T-1	2.1V	8.7mcd	588nm	40°	6.55	Active
LTL-4251N	Lite-On Inc.	Yellow	3mm T-1	2.1V	5.6mcd	588nm	60°	5.85	Active
SLR-332YY3F	Rohm Semiconductor	Yellow	3.20mm T-1	2.1V	6.3mcd	587nm	85°	4.60	Active
SLR-342YY3F	Rohm Semiconductor	Yellow	3.10mm T-1	2.1V	10mcd	587nm	40°	5.40	Not For New Designs

Engineering Selection Recommendations

Voltage Compatibility Tier 1 (Closest Match): HLMP-1621 operates at 12V forward voltage, providing the closest electrical match to the WP36BYD 14V specification. This part maintains 3mm T-1 form factor, yellow diffused lens, and 60° viewing angle. HLMP-1621 is active product status with 16,474 units in inventory. Brightness reduction from 15mcd to 2.2mcd requires circuit-level brightness compensation evaluation.

Voltage Compatibility Tier 2 (Low Voltage Applications): LTL-4251N and SLR-332YY3F both operate at 2.1V forward voltage, suitable for low-voltage circuit designs. LTL-4251N provides 5.6mcd at 60° viewing angle with 5.85mm maximum height. SLR-332YY3F provides 6.3mcd at 85° viewing angle with 4.60mm maximum height. Both maintain active product status and ROHS3 compliance.

Voltage Compatibility Tier 3 (Ultra-Low Voltage Applications): HLMP-1719 and HLMP-1719-A0002 operate at 1.8V forward voltage for battery-powered or low-power applications. Both provide 2.1mcd brightness with 50° viewing angle. HLMP-1719-A0002 offers cut tape packaging alternative to bulk packaging of HLMP-1719.

Brightness Consideration: The WP36BYD 15mcd rating significantly exceeds all listed substitutes. Applications requiring equivalent brightness must implement circuit-level current limiting adjustments or select multiple LED configurations.

Product Status Compliance: All recommended substitutes maintain active product status except SLR-342YY3F, which is marked "Not For New Designs." SLR-342YY3F should be avoided for new circuit designs.

Regulatory Compliance: All listed substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating, matching WP36BYD specifications.

Frequently Asked Questions (FAQ)

Q: Can HLMP-1620 substitute for WP36BYD in a 14V circuit? A: HLMP-1620 operates at 5V forward voltage and is not suitable for direct substitution in 14V circuits. Circuit redesign with appropriate current-limiting resistors would be required. HLMP-1621 at 12V is the closer voltage match within the Broadcom product line.

Q: What is the difference between LTL-4251 and LTL-4251N? A: Both parts operate at 2.1V forward voltage with 588nm dominant wavelength and 3mm T-1 form factor. LTL-4251 provides 8.7mcd at 40° viewing angle with 6.55mm maximum height and REACH Affected status. LTL-4251N provides 5.6mcd at 60° viewing angle with 5.85mm maximum height and REACH Unaffected status. LTL-4251N is preferred for new designs due to REACH compliance and wider viewing angle.

Q: Why is LTL-307YLC listed as a substitute if it uses 5mm T-1 3/4 form factor? A: LTL-307YLC is included because it maintains yellow diffused lens color, through-hole radial mounting, and 588nm wavelength specification. However, the 5mm T-1 3/4 form factor differs from WP36BYD 3mm T-1, requiring mechanical PCB layout verification. This part is suitable only when PCB clearance accommodates 8.60mm maximum height.

Q: Can I use SLR-342YY3F for new product designs? A: SLR-342YY3F is marked "Not For New Designs" and should not be selected for new circuit development. Active alternatives include LTL-4251N, SLR-332YY3F, and Broadcom HLMP series parts.

Q: What viewing angle differences exist between substitutes? A: WP36BYD provides 60° viewing angle. Substitutes range from 40° (LTL-4251, SLR-342YY3F) to 85° (SLR-332YY3F). Narrower viewing angles (40°) concentrate light intensity in forward direction. Wider viewing angles (85°) distribute light across broader area. Application requirements determine acceptable viewing angle range.

Q: Are all substitutes RoHS3 compliant? A: All listed substitutes maintain ROHS3 compliance matching WP36BYD specification. Regulatory compliance is maintained across all alternatives.

Q: What is the brightness difference between WP36BYD and available substitutes? A: WP36BYD provides 15mcd brightness. Substitutes range from 2.1mcd (HLMP-1719 series) to 10mcd (SLR-342YY3F). No substitute matches the 15mcd rating. Applications requiring equivalent brightness must implement circuit modifications or alternative LED configurations.

Q: Can HLMP-1719-A0002 be used interchangeably with HLMP-1719? A: Both parts are electrically and mechanically identical, operating at 1.8V with 2.1mcd brightness and 50° viewing angle. The difference is packaging: HLMP-1719 is supplied in bulk packaging while HLMP-1719-A0002 is supplied in cut tape (CT) packaging. Selection depends on assembly process requirements.

Q: What is the maximum height constraint for PCB clearance? A: WP36BYD maximum height is 5.00mm. Substitutes range from 4.60mm (SLR-332YY3F) to 8.60mm (LTL-307YLC). Parts exceeding 5.00mm require verification of available PCB clearance above component mounting location.

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