WP1503SRC/D Equivalent & Substitute Parts Reference

Part Overview

The WP1503SRC/D is a red LED indicator manufactured by Kingbright, featuring a 5mm T-1 3/4 through-hole package with 800mcd brightness at 640nm dominant wavelength. This component is classified as obsolete product status, necessitating identification of equivalent and substitute parts for ongoing design requirements and procurement continuity. The part operates at 1.85V forward voltage with 20mA test current and provides a 30° viewing angle suitable for standard indication applications.

Key Parameters

Parameter	WP1503SRC/D Value	Substitution Relevance
Color	Red	Critical - Must match
Lens Transparency	Clear	Critical - Must match
Lens Size / Package	5mm, T-1 3/4	Critical - Physical compatibility
Mounting Type	Through Hole	Critical - PCB assembly method
Voltage - Forward (Vf) Typ	1.85V	Important - Circuit design parameter
Current - Test	20mA	Important - Operating condition reference
Millicandela Rating	800mcd	Important - Brightness specification
Viewing Angle	30°	Important - Optical performance
Wavelength - Dominant	640nm	Important - Color specification
RoHS Status	ROHS3 Compliant	Important - Regulatory compliance

Substitute Part Grouping Explanation

Substitute parts for WP1503SRC/D are selected based on strict parameter alignment within the following criteria:

Critical Matching Parameters:

Color: Red (all substitutes must be red LEDs)
Lens Transparency: Clear (colorless lens)
Package Type: 5mm T-1 3/4 through-hole radial configuration
Mounting Type: Through hole

Important Compatibility Parameters:

Forward Voltage (Vf): Range 1.85V to 2.2V acceptable for standard series resistor designs
Test Current: 20mA reference condition
Lens Style: Round with domed top
RoHS Compliance: ROHS3 Compliant preferred for regulatory alignment

Performance Parameters (Application-Dependent):

Millicandela Rating: 800mcd baseline; higher ratings acceptable for increased brightness
Viewing Angle: 30° baseline; narrower angles acceptable if application permits
Wavelength - Dominant: 620nm to 640nm range maintains red color perception consistency

Substitutes are grouped into two categories: MFR Recommended (same manufacturer, active status) and Similar Manufacturer (alternative manufacturers, active status).

Parameter Comparison

Part Number	Manufacturer	Status	Vf (Typ)	mcd Rating	Wavelength Dom (nm)	Viewing Angle	Height Max (mm)	RoHS	Inventory
WP1503SRC/D	Kingbright	Obsolete	1.85V	800	640	30°	8.60	ROHS3	706 Pcs
WP1503SURCK	Kingbright	Active	1.95V	3200	630	20°	9.85	ROHS3	1422 Pcs
333-2SURC/S400-A8	Everlight	Active	2V	5000	624	10°	8.90	ROHS3	741 Pcs
383-2SDRC/S530-A4	Everlight	Active	2V	2780	639	6°	8.90	Not Listed	788 Pcs
383-2SURC/S400-A6	Everlight	Active	2V	6300	624	6°	8.90	ROHS3	640 Pcs
383-2SURC/S530-A3	Everlight	Active	2V	2500	624	6°	8.90	ROHS3	653 Pcs
383-2SURC/S530-A6	Everlight	Active	2V	6300	624	6°	8.90	Not Listed	906 Pcs
5219464F	Dialight	Active	2.2V	125	Not Listed	24°	8.81	ROHS3	3435 Pcs
7343-2SURC/H2/S400-A7	Everlight	Active	2V	1600	624	30°	8.85	ROHS3	1091 Pcs
7343-2SURC/H2/S400-A8	Everlight	Active	2V	2000	624	30°	8.85	ROHS3	889 Pcs
7343-2USRC/S1060	Everlight	Active	2V	4000	631	30°	8.85	ROHS3	1035 Pcs

Engineering Selection Recommendations

Primary Recommendation - Same Manufacturer:

WP1503SURCK (Kingbright) is the preferred substitute. This part maintains manufacturer continuity with Kingbright, carries active product status, and meets ROHS3 compliance. Forward voltage increases from 1.85V to 1.95V, requiring minor circuit resistor adjustment. Brightness increases to 3200mcd, providing enhanced visibility. Viewing angle narrows to 20° from 30°, which is acceptable for most indication applications. Height increases to 9.85mm; verify PCB clearance in confined spaces.

Secondary Recommendations - Alternative Manufacturers:

For applications requiring 30° viewing angle preservation, select from:

7343-2SURC/H2/S400-A7 (Everlight): 1600mcd, 30° viewing angle, 2V forward voltage, ROHS3 compliant
7343-2SURC/H2/S400-A8 (Everlight): 2000mcd, 30° viewing angle, 2V forward voltage, ROHS3 compliant
7343-2USRC/S1060 (Everlight): 4000mcd, 30° viewing angle, 2V forward voltage, ROHS3 compliant

For applications where narrower viewing angles are acceptable and higher brightness is beneficial:

383-2SURC/S400-A6 (Everlight): 6300mcd, 6° viewing angle, 2V forward voltage, ROHS3 compliant
383-2SURC/S530-A6 (Everlight): 6300mcd, 6° viewing angle, 2V forward voltage

Not Recommended:

5219464F (Dialight) exhibits significantly reduced brightness (125mcd versus 800mcd baseline) and is suitable only for applications with reduced brightness requirements. This part represents a downgrade in optical performance and should be selected only when lower brightness is a design requirement.

All recommended substitutes maintain through-hole radial package compatibility, 5mm T-1 3/4 form factor, and clear lens transparency. Forward voltage increases to 2V across most alternatives; circuit design must accommodate this parameter shift through resistor value adjustment.

Frequently Asked Questions (FAQ)

Q: Can WP1503SURCK directly replace WP1503SRC/D without circuit modification?

A: Physical mounting is direct; however, forward voltage increases from 1.85V to 1.95V. Series resistor values must be recalculated to maintain constant current operation at 20mA. Verify resistor adjustment in circuit design before implementation.

Q: What is the primary difference between Kingbright WP1503SURCK and Everlight 7343-2SURC/H2/S400-A8?

A: Both parts operate at 2V forward voltage and maintain 30° viewing angle. WP1503SURCK provides 3200mcd brightness with 20° viewing angle. The Everlight part provides 2000mcd brightness with 30° viewing angle. Select based on brightness and viewing angle requirements for the specific application.

Q: Are all substitute parts ROHS3 compliant?

A: Most recommended substitutes carry ROHS3 compliance. Parts 383-2SDRC/S530-A4 and 383-2SURC/S530-A6 do not list RoHS status in provided specifications. Verify compliance documentation with supplier before procurement if regulatory certification is required.

Q: Why does the Dialight 5219464F show such low brightness compared to other options?

A: The 5219464F is specified at 125mcd, representing a different product category within red LED indicators. This part is suitable only for applications where reduced brightness is acceptable or required. Do not select this part as a direct replacement for standard 800mcd+ brightness applications.

Q: Can I use parts with narrower viewing angles (6°) in place of the 30° original specification?

A: Narrower viewing angles concentrate light output in a smaller cone, increasing brightness perception within that cone but reducing visibility from off-axis positions. Select narrow-angle parts only if application geometry permits restricted viewing angles. Verify optical performance in actual installation before full production deployment.

Q: What is the impact of increased forward voltage on circuit design?

A: Forward voltage increases from 1.85V to 2V across most substitutes. In a series resistor circuit, this reduces voltage drop across the resistor by 0.15V. Recalculate resistor value using Ohm's law: R = (Vsupply - Vf) / I. For example, in a 5V supply circuit with 20mA target current, resistor changes from 160Ω to 150Ω. Verify resistor power rating remains adequate.

Q: Are height differences significant for PCB layout?

A: Original WP1503SRC/D height is 8.60mm maximum. Substitutes range from 8.81mm to 9.85mm. Height increases of 0.2mm to 1.25mm are generally accommodated in standard PCB designs. Verify clearance in applications with height-constrained enclosures or stacked component arrangements.

Q: Which substitute offers the closest electrical match to the original part?

A: WP1503SURCK (Kingbright) provides the closest electrical match with only 0.1V forward voltage increase and same manufacturer sourcing. This part is recommended as the primary substitute for direct replacement scenarios.

Q: Can I mix different substitute parts in the same design?

A: All recommended substitutes maintain compatible package, mounting, and color specifications. However, brightness and viewing angle variations may create visual inconsistency if multiple LEDs are visible in the same application. For aesthetic uniformity, select a single substitute part number for all LED positions in a design.

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