WP7104YD Yellow Diffused T-1 LED - Equivalent & Substitute Parts

Part Overview

The WP7104YD is a yellow diffused T-1 through-hole LED manufactured by Kingbright, designed for discrete LED indication applications. This component features a 588nm dominant wavelength with 15mcd brightness rating and 2.1V forward voltage at 20mA test current. The product is currently classified as obsolete, making identification of equivalent and substitute parts essential for ongoing design support, maintenance, and production continuity. Active equivalent parts from Kingbright and alternative manufacturers provide functional replacements while maintaining compatibility with existing through-hole PCB designs.

Key Parameters

Parameter	Value	Unit
Color	Yellow	-
Lens Transparency	Diffused	-
Lens Size	3mm, T-1	-
Mounting Type	Through Hole	-
Wavelength - Dominant	588nm	nm
Voltage - Forward (Vf) Typical	2.1V	V
Current - Test	20mA	mA
Millicandela Rating	15mcd	mcd
Viewing Angle	40°	degrees
Package / Case	Radial	-
Height (Max)	5.90mm	mm
RoHS Status	ROHS3 Compliant	-
Moisture Sensitivity Level	1 (Unlimited)	-

Substitute Part Grouping Explanation

Substitution of the WP7104YD is determined by strict alignment of the following critical parameters:

Primary Substitution Criteria:

Color: Yellow
Lens Transparency: Diffused
Lens Size: 3mm, T-1 form factor
Mounting Type: Through Hole, Radial package
Wavelength Range: 585nm to 591nm (dominant or peak)
Voltage - Forward (Vf): 2.0V to 2.1V
Current - Test: 20mA nominal
RoHS3 Compliance: Required
Moisture Sensitivity Level: 1 (Unlimited)

Parametric Equivalent Classification: Parts meeting all primary criteria with identical electrical and mechanical specifications are classified as parametric equivalents. The WP710A10YD from Kingbright qualifies as a parametric equivalent, differing only in product status (Active vs. Obsolete) and packaging format (Bulk vs. standard).

Similar Part Classification: Parts meeting core functional requirements (yellow diffused 3mm T-1 through-hole LED) but with variations in brightness (mcd), viewing angle, or forward voltage are classified as similar parts. These parts maintain compatibility with standard through-hole PCB designs and yellow LED indication circuits but may require circuit verification for brightness and viewing angle requirements.

Parameter Comparison

Parameter	WP7104YD (Main)	WP710A10YD	1254-10UYD/S530-A3	151031YS05900	264-7UYD/S530-A3	3YD-F	3YDL-F	HLMP-1620	HLMP-1621
Manufacturer	Kingbright	Kingbright	Everlight	Würth Elektronik	Everlight	Bivar Inc.	Bivar Inc.	Broadcom	Broadcom
Color	Yellow	Yellow	Yellow	Yellow	Yellow	Yellow	Yellow	Yellow	Yellow
Lens Transparency	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused	Diffused
Lens Size	3mm, T-1	3mm, T-1	3.00mm Dia	3.00mm Dia	2.90mm Dia	3mm, T-1	3mm, T-1	3mm, T-1	3mm, T-1
Mounting Type	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole	Through Hole
Wavelength - Dominant (nm)	588	588	589	590	589	-	-	585	585
Wavelength - Peak (nm)	590	590	591	585	591	590	590	583	583
Voltage - Forward (Vf) Typ (V)	2.1	2.1	2.0	2.1	2.0	2.0	2.0	5.0	12.0
Current - Test (mA)	20	20	20	20	20	20	2	10	13
Millicandela Rating (mcd)	15	15	200	30	125	20	2	2.2	2.2
Viewing Angle (degrees)	40	40	30	60	60	35	35	60	60
Height Max (mm)	5.90	5.90	5.20	5.55	6.20	5.30	5.30	6.35	6.35
Product Status	Obsolete	Active	Active	Active	Active	Active	Active	Active	Active
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)

Engineering Selection Recommendations

Parametric Equivalent - Direct Replacement:

WP710A10YD (Kingbright) is the primary parametric equivalent for WP7104YD. This part maintains identical electrical specifications (2.1V forward voltage, 20mA test current, 15mcd brightness, 40° viewing angle) and mechanical form factor (3mm T-1 through-hole radial package). The part is Active status with ROHS3 compliance and unlimited moisture sensitivity rating. Inventory availability is 4678 pieces. This part is suitable for direct substitution in all applications where WP7104YD was originally specified.

Similar Parts - Circuit Verification Required:

The following parts are functionally compatible yellow diffused 3mm T-1 through-hole LEDs but require verification of brightness and viewing angle requirements:

1254-10UYD/S530-A3 (Everlight): 200mcd brightness (13.3x higher than WP7104YD), 30° viewing angle, 2.0V forward voltage. Suitable for applications requiring higher brightness output.
151031YS05900 (Würth Elektronik, WL-TMRC Series): 30mcd brightness (2x higher), 60° viewing angle, 2.1V forward voltage. Suitable for applications requiring wider viewing angle.
264-7UYD/S530-A3 (Everlight): 125mcd brightness (8.3x higher), 60° viewing angle, 2.0V forward voltage. Suitable for high-brightness applications with wide viewing angle requirement.
3YD-F (Bivar Inc.): 20mcd brightness (1.3x higher), 35° viewing angle, 2.0V forward voltage. Closest brightness match to WP7104YD with minimal circuit adjustment.
3YDL-F (Bivar Inc.): 2mcd brightness (0.13x lower), 35° viewing angle, 2.0V forward voltage, 2mA test current. Suitable only for low-brightness indicator applications.

Not Recommended for Direct Substitution:

HLMP-1620 (Broadcom): 5V forward voltage requires circuit redesign. 10mA test current differs from 20mA specification. 2.2mcd brightness significantly lower than WP7104YD.
HLMP-1620-C00A1 and HLMP-1620-C00A2 (Broadcom): Right-angle mounting configuration incompatible with radial through-hole PCB layouts. 5V forward voltage requires circuit redesign.
HLMP-1621 (Broadcom): 12V forward voltage requires circuit redesign. 13mA test current differs from 20mA specification. 2.2mcd brightness significantly lower than WP7104YD.

All recommended substitute parts maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), ensuring regulatory and environmental compatibility with the original WP7104YD specification.

Frequently Asked Questions (FAQ)

Q: Can WP710A10YD be used as a direct replacement for WP7104YD?

A: Yes. WP710A10YD is a parametric equivalent with identical electrical and mechanical specifications. The only differences are product status (Active vs. Obsolete) and packaging format (Bulk). No circuit modifications are required.

Q: What is the primary difference between parametric equivalents and similar parts?

A: Parametric equivalents match all critical electrical parameters (forward voltage, test current, brightness, viewing angle) and mechanical form factor. Similar parts maintain the same color, lens type, and through-hole mounting but may differ in brightness (mcd) or viewing angle, requiring circuit verification before substitution.

Q: Can I substitute a higher brightness LED (200mcd) for the 15mcd WP7104YD?

A: Higher brightness LEDs such as 1254-10UYD/S530-A3 (200mcd) are mechanically compatible but will produce significantly brighter output. Circuit verification is required to confirm the application can tolerate increased brightness without causing visual glare or exceeding current limiting resistor specifications.

Q: Why are HLMP-1620 and HLMP-1621 not recommended as substitutes?

A: These Broadcom parts operate at 5V and 12V forward voltage respectively, compared to 2.1V for WP7104YD. Direct substitution would require complete circuit redesign of the LED drive circuit. Additionally, their brightness (2.2mcd) is significantly lower than the original 15mcd specification.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All substitute parts listed in this document are ROHS3 compliant and carry unlimited moisture sensitivity rating (MSL 1), matching the environmental and regulatory compliance of the original WP7104YD.

Q: What viewing angle differences exist among substitute parts?

A: WP7104YD has a 40° viewing angle. Substitute parts range from 30° (narrower, more directional) to 60° (wider, more omnidirectional). Applications requiring specific viewing angle characteristics should verify compatibility before substitution. The 3YD-F (35°) and 3YDL-F (35°) provide the closest viewing angle match.

Q: Can I use 151031YS05900 in place of WP7104YD?

A: Yes, with circuit verification. 151031YS05900 is mechanically and electrically compatible (2.1V forward voltage, 20mA test current) but offers 30mcd brightness (2x higher) and 60° viewing angle (compared to 40°). The application must tolerate increased brightness and wider viewing angle.

Q: What is the inventory status of substitute parts?

A: WP710A10YD has the highest inventory (4678 pieces). Other active substitutes range from 678 to 16474 pieces. Consult current inventory databases for real-time availability before design finalization.

Q: Are there any mechanical dimension differences that affect PCB layout?

A: All substitute parts maintain 3mm T-1 through-hole radial package compatibility. Height variations range from 5.20mm to 6.35mm. PCB designs with height constraints should verify maximum height specifications. The 1254-10UYD/S530-A3 has the lowest profile (5.20mm).

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