WP7104LGD Green Diffused T-1 LED Equivalent & Substitute Parts

Part Overview

The WP7104LGD is a green diffused T-1 through-hole LED manufactured by Kingbright, designed for LED indication applications with a dominant wavelength of 568nm. This component features a 3mm round lens with domed top, forward voltage of 1.9V at 2mA test current, and a brightness rating of 2mcd with a 40° viewing angle.

The WP7104LGD is classified as obsolete. Identifying equivalent and substitute parts is necessary to maintain design continuity, ensure supply chain availability, and support ongoing production or repair requirements. Active alternatives with comparable electrical and mechanical characteristics are available from multiple manufacturers.

Key Parameters

Parameter	WP7104LGD Value	Specification Basis
Color	Green	Visual indication requirement
Lens Transparency	Diffused	Light distribution characteristic
Lens Size	3mm, T-1	Physical form factor and mounting compatibility
Mounting Type	Through Hole	PCB assembly method
Wavelength - Dominant	568nm	Color specification
Voltage - Forward (Vf) (Typ)	1.9V	Circuit design parameter
Current - Test	2mA	Operating point specification
Millicandela Rating	2mcd	Brightness level
Viewing Angle	40°	Light emission pattern
Package / Case	Radial	Lead configuration
RoHS Status	ROHS3 Compliant	Environmental compliance
Moisture Sensitivity Level (MSL)	1 (Unlimited)	Storage and handling requirement

Substitute Part Grouping Explanation

Substitution of the WP7104LGD is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

Color: Green
Lens Transparency: Diffused
Lens Size: 3mm, T-1
Mounting Type: Through Hole
Package / Case: Radial
Wavelength - Dominant: 568nm (±5nm tolerance acceptable for green indication)

Secondary Compatibility Factors:

Voltage - Forward (Vf): 1.9V nominal (range 1.8V to 2.2V acceptable with circuit adjustment)
Current - Test: 2mA nominal (range 2mA to 20mA acceptable with current-limiting resistor adjustment)
Millicandela Rating: 2mcd nominal (brightness variation acceptable if application permits)
Viewing Angle: 40° nominal (variation acceptable based on application requirements)

Compliance Requirements:

RoHS3 Compliant
Moisture Sensitivity Level (MSL): 1 (Unlimited)

Substitute parts are grouped into two categories:

Direct Equivalent (Identical Electrical and Mechanical Characteristics):

WP710A10LGD (Kingbright, Active status)

Compatible Alternatives (Electrical or Mechanical Variation Within Acceptable Range):

3GDL-F (Bivar Inc., 2.1V Vf, 4mcd, 35° viewing angle)
HLMP-1503-D00FG (Broadcom Limited, 2.1V Vf, 4.2mcd, 60° viewing angle)
151031VS06000 (Würth Elektronik, 2.2V Vf, 30mcd, 60° viewing angle)
264-7SYGD/S530-E2 (Everlight Electronics, 2V Vf, 50mcd, 573nm wavelength, 60° viewing angle)
3GD-F (Bivar Inc., 2.1V Vf, 25mcd, 35° viewing angle)

Not Recommended for Direct Substitution:

HLMP-1640 (5V Vf - requires circuit redesign)
HLMP-1640-B00A1 (5V Vf, Right Angle mounting - requires circuit redesign and mechanical modification)
HLMP-1640-B00A2 (5V Vf, Right Angle mounting - requires circuit redesign and mechanical modification)
HLMP-1641 (12V Vf - requires circuit redesign)

Parameter Comparison

Part Number	Manufacturer	Product Status	Color	Lens Size	Vf (Typ)	Current - Test	mcd	Wavelength - Dominant	Viewing Angle	Height (Max)	RoHS Status
WP7104LGD	Kingbright	Obsolete	Green	3mm, T-1	1.9V	2mA	2	568nm	40°	5.90mm	ROHS3
WP710A10LGD	Kingbright	Active	Green	3mm, T-1	1.9V	2mA	2	568nm	40°	5.90mm	ROHS3
3GDL-F	Bivar Inc.	Active	Green	3mm, T-1	2.1V	2mA	4	—	35°	5.30mm	ROHS3
HLMP-1503-D00FG	Broadcom Limited	Active	Green	3mm, T-1	2.1V	10mA	4.2	569nm	60°	6.35mm	ROHS3
151031VS06000	Würth Elektronik	Active	Green	3.00mm Dia	2.2V	20mA	30	568nm	60°	5.55mm	ROHS3
264-7SYGD/S530-E2	Everlight Electronics Co Ltd	Active	Yellow-Green	2.90mm Dia	2V	20mA	50	573nm	60°	6.20mm	ROHS3
3GD-F	Bivar Inc.	Active	Green	3mm, T-1	2.1V	20mA	25	—	35°	5.30mm	ROHS3
HLMP-1640	Broadcom Limited	Active	Green	3mm, T-1	5V	10mA	1.6	569nm	60°	6.35mm	ROHS3
HLMP-1641	Broadcom Limited	Active	Green	3mm, T-1	12V	13mA	1.6	569nm	60°	6.35mm	ROHS3

Engineering Selection Recommendations

Recommended Direct Replacement:

WP710A10LGD (Kingbright) is the primary recommended substitute. This part is electrically and mechanically identical to the WP7104LGD, with identical forward voltage (1.9V), test current (2mA), brightness (2mcd), wavelength (568nm), and physical dimensions. The WP710A10LGD is in active production status with substantial inventory availability (26,374 pcs), ensuring long-term supply continuity. Both parts are ROHS3 compliant with MSL 1 (Unlimited) rating.

Compatible Alternatives for Low-Current Applications (2mA Operating Point):

3GDL-F (Bivar Inc.) is compatible for applications where the 0.2V increase in forward voltage (2.1V vs. 1.9V) and 2mcd brightness increase can be accommodated. This part maintains the 2mA test current specification and T-1 form factor. The 35° viewing angle is narrower than the original 40°, which may affect light distribution in some applications. Product status is active with 2,600 pcs inventory.

Compatible Alternatives for Higher-Current Applications (10mA to 20mA Operating Point):

HLMP-1503-D00FG (Broadcom Limited) operates at 10mA test current with 2.1V forward voltage and 4.2mcd brightness. The 60° viewing angle provides wider light distribution than the original 40°. This part is suitable for applications where increased brightness and wider viewing angle are acceptable. Product status is active with 870 pcs inventory.

151031VS06000 (Würth Elektronik) operates at 20mA test current with 2.2V forward voltage and 30mcd brightness. This part provides significantly higher brightness and wider viewing angle (60°). Circuit current-limiting resistor adjustment is required. Product status is active with 17,531 pcs inventory.

Not Recommended:

HLMP-1640 (5V Vf) and HLMP-1641 (12V Vf) require complete circuit redesign and are not suitable for direct substitution in applications designed for 1.9V operation.

264-7SYGD/S530-E2 (Everlight Electronics) has a yellow-green wavelength (573nm) rather than pure green (568nm), which may produce visually different color indication. This part is suitable only if yellow-green indication is acceptable.

Frequently Asked Questions (FAQ)

Q: Can WP710A10LGD be used as a direct replacement for WP7104LGD without circuit modification?

A: Yes. WP710A10LGD is electrically and mechanically identical to WP7104LGD. No circuit modification is required. Both parts have 1.9V forward voltage, 2mA test current, 2mcd brightness, and identical physical dimensions. The only difference is product status (WP710A10LGD is active; WP7104LGD is obsolete).

Q: What is the maximum forward voltage variation acceptable for substitution?

A: The WP7104LGD operates at 1.9V nominal. Substitute parts with forward voltage up to 2.2V are compatible with minor circuit adjustment. Parts with 5V or 12V forward voltage (HLMP-1640, HLMP-1641) require complete circuit redesign and are not suitable for direct substitution.

Q: Can I use a substitute part with higher brightness (mcd rating)?

A: Yes, if the application permits. Parts with higher brightness (3GD-F at 25mcd, 151031VS06000 at 30mcd, 264-7SYGD/S530-E2 at 50mcd) can be used as substitutes. However, the current-limiting resistor in the circuit must be adjusted to maintain safe operating current. Higher brightness may also affect visual perception in the application.

Q: What is the difference between 3GD-F and 3GDL-F?

A: Both are Bivar Inc. green diffused T-1 LEDs with 2.1V forward voltage and identical physical dimensions. The primary difference is brightness: 3GD-F is rated at 25mcd with 20mA test current, while 3GDL-F is rated at 4mcd with 2mA test current. For applications requiring 2mA operation similar to WP7104LGD, 3GDL-F is the appropriate choice.

Q: Why is 264-7SYGD/S530-E2 listed as a compatible alternative if it is yellow-green instead of green?

A: 264-7SYGD/S530-E2 meets the mechanical and electrical compatibility criteria (3mm T-1 diffused lens, through-hole mounting, radial package, ROHS3 compliant). However, the dominant wavelength is 573nm (yellow-green) rather than 568nm (green). This part is suitable only for applications where yellow-green indication is functionally acceptable. Visual color difference should be verified before implementation.

Q: What is the viewing angle significance in LED substitution?

A: Viewing angle determines the cone of light emission. The WP7104LGD has a 40° viewing angle. Substitute parts with wider viewing angles (60°) distribute light over a larger area, which may affect visibility in specific mounting positions. Substitute parts with narrower viewing angles (35°) concentrate light in a smaller cone, which may reduce visibility from certain angles. Application requirements determine acceptable viewing angle variation.

Q: Are all substitute parts ROHS3 compliant?

A: Yes. All substitute parts listed in this document are ROHS3 compliant and have MSL 1 (Unlimited) moisture sensitivity rating, matching the environmental compliance profile of the WP7104LGD.

Q: What inventory considerations should guide part selection?

A: WP710A10LGD has the highest inventory availability (26,374 pcs), ensuring immediate supply and long-term availability. 151031VS06000 (17,531 pcs) and HLMP-1640 (21,912 pcs) also have substantial inventory. Parts with lower inventory (3GDL-F at 2,600 pcs, 3GD-F at 1,419 pcs, 264-7SYGD/S530-E2 at 1,082 pcs) may have supply constraints for high-volume applications.

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