WP1503EC LED RED CLEAR T-1 3/4 T/H Equivalent & Substitute Parts

Part Overview

The WP1503EC is a red LED indication component manufactured by Kingbright, designed for through-hole mounting applications. This discrete 5mm T-1 3/4 LED operates at 2V forward voltage with a 50mcd brightness rating and 617nm dominant wavelength. The component is currently in active product status with RoHS3 compliance and unlimited moisture sensitivity rating.

Substitute parts are necessary when the WP1503EC becomes unavailable, when design requirements demand alternative electrical characteristics such as higher brightness output or different forward voltage specifications, or when supply chain optimization requires component standardization across multiple manufacturers.

Key Parameters

Parameter	Value	Unit	Substitution Relevance
Lens Size	5mm, T-1 3/4	-	Critical - Physical fit in PCB mounting holes
Mounting Type	Through Hole	-	Critical - Assembly compatibility
Voltage - Forward (Vf)	2V	Typical	Important - Circuit design and current limiting resistor selection
Current - Test	20mA	-	Important - Operating point specification
Color	Red	-	Critical - Visual indication function
Lens Transparency	Clear	-	Critical - Optical output characteristics
Wavelength - Dominant	617nm	-	Important - Color perception and application requirements
Millicandela Rating	50mcd	-	Important - Brightness and visibility requirements
Viewing Angle	30°	-	Important - Visibility cone and application fit
Package / Case	Radial	-	Critical - Lead configuration and PCB layout
RoHS Status	ROHS3 Compliant	-	Critical - Regulatory compliance requirement

Substitute Part Grouping Explanation

Substitution logic for the WP1503EC is based on strict alignment of the following parameters:

Critical Parameters (Must Match):

Lens Size: 5mm, T-1 3/4 form factor
Mounting Type: Through Hole radial configuration
Color: Red
Lens Transparency: Clear
Package / Case: Radial lead configuration
RoHS Status: ROHS3 Compliant

Important Parameters (Acceptable Variation Within Limits):

Voltage - Forward (Vf): Range 1.7V to 2.2V allows circuit adaptation through resistor selection
Millicandela Rating: Brightness variation acceptable based on application requirements
Wavelength - Dominant: Red spectrum 617nm to 637nm maintains color perception
Viewing Angle: 20° to 130° accommodates different visibility requirements
Height (Max): Variation acceptable within PCB clearance constraints

Excluded from Substitution:

Parts with obsolete product status are listed for reference only and not recommended for new designs
Parts with non-compliant regulatory status

All substitute parts listed maintain the same test current of 20mA and radial package configuration as the WP1503EC.

Parameter Comparison

Part Number	Manufacturer	Vf (Typ)	mcd Rating	Wavelength - Dominant	Viewing Angle	Height (Max)	Product Status	RoHS Status
WP1503EC	Kingbright	2V	50mcd	617nm	30°	8.60mm	Active	ROHS3 Compliant
HLMP-D105	Broadcom Limited	1.8V	240mcd	637nm	24°	12.44mm	Active	ROHS3 Compliant
LTL2R3KEK	Lite-On Inc.	2.05V	700mcd	624nm	30°	8.70mm	Active	ROHS3 Compliant
MV3750	onsemi	2.2V	150mcd	-	24°	8.89mm	Obsolete	ROHS3 Compliant
OVLLR8C7	TT Electronics/Optek Technology	2V	900mcd	623nm	100°	6.80mm	Active	ROHS3 Compliant
SSL-LX5093SRC/DU	Lumex Opto/Components Inc.	1.7V	1200mcd	-	30°	8.60mm	Obsolete	ROHS3 Compliant
SSL-LX5093SRC/DV	Lumex Opto/Components Inc.	1.7V	1500mcd	-	30°	8.60mm	Active	ROHS3 Compliant
SSL-LX5093SRC/F	Lumex Opto/Components Inc.	1.7V	1200mcd	-	30°	8.60mm	Active	ROHS3 Compliant
SSL-LX5093XRC/4	Lumex Opto/Components Inc.	1.7V	2500mcd	-	20°	8.60mm	Active	ROHS3 Compliant
XLM2ACR169W	SunLED	2.2V	695mcd	625nm	130°	4.85mm	Active	ROHS3 Compliant

Engineering Selection Recommendations

For Direct Replacement (Minimal Circuit Modification):

LTL2R3KEK and OVLLR8C7 are the primary substitutes for the WP1503EC. Both maintain the 2V forward voltage specification, eliminating the need for current-limiting resistor recalculation. LTL2R3KEK provides a 700mcd brightness increase with identical 30° viewing angle and comparable height. OVLLR8C7 offers significantly higher brightness (900mcd) with a wider 100° viewing angle and reduced height, suitable for applications requiring enhanced visibility.

For Brightness-Enhanced Applications:

SSL-LX5093SRC/F and SSL-LX5093SRC/DV deliver 1200mcd and 1500mcd respectively, with 1.7V forward voltage. These components require circuit resistor adjustment due to the 0.3V voltage differential. Both maintain the 30° viewing angle and 8.60mm height of the WP1503EC. SSL-LX5093XRC/4 provides maximum brightness at 2500mcd with narrower 20° viewing angle, suitable for focused indication applications.

For Narrow Viewing Angle Applications:

HLMP-D105 offers 240mcd brightness with a 24° viewing angle and 1.8V forward voltage. The increased height of 12.44mm requires PCB clearance verification. This component is suitable for applications requiring directional indication with reduced side visibility.

For Wide Viewing Angle Applications:

XLM2ACR169W provides 130° viewing angle with 695mcd brightness and 2.2V forward voltage. The reduced height of 4.85mm accommodates space-constrained designs. This component is optimal for omnidirectional indication requirements.

Regulatory Compliance:

All recommended active-status substitutes maintain ROHS3 compliance and unlimited moisture sensitivity rating (MSL 1), ensuring compatibility with current manufacturing and environmental standards. Obsolete-status parts (MV3750, SSL-LX5093SRC/DU) are not recommended for new designs.

Frequently Asked Questions (FAQ)

Q: Can I use SSL-LX5093SRC/F as a direct replacement without circuit modification?

A: No. The SSL-LX5093SRC/F operates at 1.7V forward voltage compared to the WP1503EC's 2V. This 0.3V difference requires recalculation of the current-limiting resistor to maintain 20mA test current. The brightness increase from 50mcd to 1200mcd also affects circuit design considerations.

Q: What is the physical compatibility concern with HLMP-D105?

A: The HLMP-D105 has a maximum height of 12.44mm, compared to the WP1503EC's 8.60mm. This 3.84mm height difference requires verification of available PCB clearance above the component to prevent mechanical interference with enclosure or adjacent components.

Q: Why is MV3750 listed if it is obsolete?

A: Obsolete parts are included for reference in legacy system documentation and reverse-engineering applications. For new designs and production, only active-status components should be selected. MV3750 is not recommended for procurement.

Q: Which substitute provides the closest electrical match to WP1503EC?

A: LTL2R3KEK provides the closest match with 2.05V forward voltage (within 0.05V of the WP1503EC's 2V specification) and identical 30° viewing angle. The 700mcd brightness represents a 14x increase, which may require circuit resistor adjustment depending on application requirements.

Q: Can I use XLM2ACR169W in a space-constrained application?

A: Yes. XLM2ACR169W has a maximum height of 4.85mm, the lowest among all substitutes. However, the 2.2V forward voltage requires resistor recalculation, and the 130° viewing angle differs significantly from the WP1503EC's 30°. Verify that the wide viewing angle is compatible with your application's visibility requirements.

Q: What is the brightness difference between WP1503EC and OVLLR8C7?

A: OVLLR8C7 delivers 900mcd compared to WP1503EC's 50mcd, representing an 18x brightness increase. Both operate at 2V forward voltage. The OVLLR8C7's wider 100° viewing angle and reduced 6.80mm height make it suitable for high-visibility applications with omnidirectional requirements.

Q: Are all substitute parts RoHS3 compliant?

A: Yes. All active-status substitute parts listed (HLMP-D105, LTL2R3KEK, OVLLR8C7, SSL-LX5093SRC/DV, SSL-LX5093SRC/F, SSL-LX5093XRC/4, XLM2ACR169W) maintain ROHS3 compliance. Obsolete parts MV3750 and SSL-LX5093SRC/DU also carry ROHS3 compliance but are not recommended for new designs.

Q: How does viewing angle affect component selection?

A: Viewing angle determines the cone of light visibility. The WP1503EC's 30° angle provides directional indication. Narrower angles (20-24°) concentrate light for focused applications. Wider angles (100-130°) distribute light for omnidirectional visibility. Selection depends on whether the LED must be visible from multiple directions or from a specific viewing position.

Q: What is the impact of wavelength variation on color perception?

A: The WP1503EC's 617nm dominant wavelength falls in the red spectrum. Substitute parts range from 623nm to 637nm, all within the red spectrum. These variations produce imperceptible color differences to human perception. Wavelength selection is application-dependent; narrower wavelength ranges (617-625nm) are preferred for color-critical applications.

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