WP36BGD Equivalent & Substitute Parts Reference

Part Overview

The WP36BGD is a green diffused T-1 through-hole LED manufactured by Kingbright, designed for LED indication applications. This component features a 3mm lens with domed top, 588nm dominant wavelength, and 25mcd brightness rating. The part is currently in active product status with 1067 units in stock inventory.

Substitute parts are necessary when the WP36BGD becomes unavailable, when alternative voltage ratings better match circuit requirements, or when different brightness levels are required for specific application needs. The following equivalent components maintain compatibility through shared mechanical form factors and optical characteristics while offering variations in electrical performance parameters.

Key Parameters

Parameter	WP36BGD Value	Substitution Relevance
Lens Size	3mm, T-1	Critical - determines mechanical fit
Lens Style	Round with Domed Top	Critical - optical form factor
Lens Transparency	Diffused	Critical - light distribution characteristic
Color	Green	Critical - wavelength specification
Mounting Type	Through Hole	Critical - PCB assembly method
Voltage - Forward (Vf) (Typ)	14V	Important - circuit design dependent
Millicandela Rating	25mcd	Important - brightness level
Viewing Angle	60°	Important - visibility characteristics
Wavelength - Dominant	588nm	Important - color specification
Package / Case	Radial	Critical - lead configuration
RoHS Status	ROHS3 Compliant	Important - regulatory compliance

Substitute Part Grouping Explanation

Substitution logic for the WP36BGD is based on the following mandatory parameters:

Critical Mechanical Compatibility Parameters:

Lens Size: 3mm, T-1 form factor
Lens Style: Round with Domed Top
Mounting Type: Through Hole
Package / Case: Radial lead configuration

Critical Optical Parameters:

Lens Transparency: Diffused
Color: Green (wavelength range 560nm–588nm)

Electrical Performance Parameters (Application-Dependent):

Voltage - Forward (Vf): Varies by substitute (1.9V to 14V)
Millicandela Rating: Varies by substitute (1.6mcd to 25mcd)
Viewing Angle: Varies by substitute (35° to 90°)

Regulatory Compliance:

RoHS3 Compliant status required
REACH Unaffected or REACH Affected acceptable

Substitute parts are grouped by forward voltage rating, as this parameter determines circuit compatibility and current-limiting resistor selection. Parts with identical mechanical and optical characteristics but different electrical ratings are considered valid substitutes when the application circuit can accommodate the voltage and current specifications.

Parameter Comparison

Part Number	Manufacturer	Vf (Typ)	mcd Rating	Viewing Angle	Wavelength - Dominant	Wavelength - Peak	Height (Max)	Product Status	Inventory
WP36BGD	Kingbright	14V	25mcd	60°	588nm	565nm	5.00mm	Active	1067 Pcs
3GD-F	Bivar Inc.	2.1V	25mcd	35°	—	568nm	5.30mm	Active	1419 Pcs
HLMP-1640	Broadcom Limited	5V	1.6mcd	60°	569nm	565nm	6.35mm	Active	21912 Pcs
HLMP-1640-B00A1	Broadcom Limited	5V	1.6mcd	120°	—	565nm	—	Active	4405 Pcs
HLMP-1640-B00A2	Broadcom Limited	5V	1.6mcd	60°	—	565nm	—	Active	7004 Pcs
HLMP-1641	Broadcom Limited	12V	1.6mcd	60°	569nm	565nm	6.35mm	Active	4525 Pcs
HLMP-1790	Broadcom Limited	1.9V	2.3mcd	50°	569nm	565nm	6.35mm	Active	24307 Pcs
HLMP-1790-A0002	Broadcom Limited	1.9V	2.3mcd	50°	569nm	565nm	6.35mm	Active	26157 Pcs
LTL-4231	Lite-On Inc.	2.1V	12.6mcd	40°	569nm	565nm	6.55mm	Active	44239 Pcs
MV5474C	onsemi	2.2V	9mcd	90°	—	565nm	5.84mm	Obsolete	877 Pcs
SLI-343P8G3F	Rohm Semiconductor	2.2V	22mcd	40°	560nm	—	5.60mm	Active	15920 Pcs

Engineering Selection Recommendations

For Direct Mechanical and Optical Replacement (Same Voltage Class):

The HLMP-1641 (Broadcom Limited) is the closest substitute for the WP36BGD when a 12V forward voltage is acceptable. Both parts share 60° viewing angle and 565nm peak wavelength. The HLMP-1641 is ROHS3 compliant, active product status, and maintains 4525 units in inventory.

For Low-Voltage Applications (1.9V–2.2V Class):

When circuit design requires lower forward voltage, the following active parts are suitable:

HLMP-1790 or HLMP-1790-A0002 (1.9V, 2.3mcd, 50° viewing angle) — highest inventory availability at 24307 and 26157 units respectively
LTL-4231 (2.1V, 12.6mcd, 40° viewing angle) — highest inventory at 44239 units, closest brightness match to WP36BGD
3GD-F (2.1V, 25mcd, 35° viewing angle) — exact brightness match to WP36BGD
SLI-343P8G3F (2.2V, 22mcd, 40° viewing angle) — near-brightness match, EXCELED™ series

For Mid-Voltage Applications (5V Class):

The HLMP-1640 series (Broadcom Limited, 5V, 1.6mcd) offers high inventory availability (21912 units standard, 4405 units right-angle variant, 7004 units right-angle variant). These parts are suitable when 5V forward voltage matches circuit requirements.

Regulatory Compliance:

All recommended active substitutes maintain ROHS3 compliance. The LTL-4231 carries REACH Affected status; all others are REACH Unaffected. Product status is Active for all recommended substitutes except MV5474C, which is Obsolete and should be avoided for new designs.

Inventory Considerations:

Highest availability substitutes are HLMP-1790-A0002 (26157 units), HLMP-1790 (24307 units), and LTL-4231 (44239 units). These parts offer reliable supply for production requirements.

Frequently Asked Questions (FAQ)

Q: Can I use a substitute part with a different forward voltage than the WP36BGD?

A: Yes, provided your circuit design accommodates the different voltage rating. The forward voltage (Vf) determines the voltage drop across the LED and affects current-limiting resistor selection. Substitutes with lower Vf (1.9V–2.2V) require different resistor values than the 14V WP36BGD. Substitutes with 5V or 12V Vf require intermediate resistor adjustments. Verify your power supply voltage and resistor calculations before substitution.

Q: What is the difference between the HLMP-1790 and HLMP-1790-A0002?

A: Both parts are electrically and mechanically identical (1.9V, 2.3mcd, 50° viewing angle, 6.35mm height). The primary difference is packaging: HLMP-1790 is supplied in Bulk packaging, while HLMP-1790-A0002 is supplied in Cut Tape (CT) packaging. Select based on your assembly process requirements.

Q: Why does the WP36BGD have a 14V forward voltage while most substitutes are 2V–5V?

A: The WP36BGD is designed for direct connection to 14V or higher voltage supplies with appropriate current-limiting resistors. Lower-voltage substitutes (2V–5V class) are designed for standard logic-level circuits and lower-voltage power supplies. The choice depends on your application's power supply voltage and circuit design.

Q: Can I substitute the WP36BGD with the HLMP-1640-B00A1 or HLMP-1640-B00A2?

A: These parts have different mounting configurations (right-angle through-hole) compared to the WP36BGD (radial through-hole). They are not suitable as direct substitutes unless your PCB layout specifically requires right-angle mounting. The standard HLMP-1640 (radial) is the appropriate choice for radial mounting applications.

Q: Is the MV5474C a viable substitute?

A: The MV5474C is classified as Obsolete product status and should not be selected for new designs or production applications. Although it remains in limited inventory (877 units), active alternatives with better availability and ongoing manufacturer support are available.

Q: How do brightness ratings (mcd) affect substitution?

A: The WP36BGD provides 25mcd brightness. Substitutes with lower mcd ratings (1.6mcd–12.6mcd) produce dimmer indication. The LTL-4231 (12.6mcd) and 3GD-F (25mcd) provide comparable brightness. The HLMP-1640 series (1.6mcd) produces significantly dimmer indication. Select based on your application's visibility requirements and ambient lighting conditions.

Q: What does "Diffused" lens transparency mean?

A: Diffused lenses scatter light over a wider area, providing more uniform brightness across the viewing angle. All listed substitutes maintain diffused lens transparency, ensuring consistent optical performance. This characteristic is maintained across all mechanical form factors.

Q: Are all substitute parts RoHS3 compliant?

A: Yes, all active substitute parts listed are ROHS3 compliant. The MV5474C (Obsolete) does not specify RoHS3 status and should be avoided. Compliance status is verified for all recommended active alternatives.

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