WP7143SGC Equivalent & Substitute Parts Reference

Part Overview

The WP7143SGC is a green LED indicator manufactured by Kingbright, designed for through-hole mounting applications. This T-1 3/4 (5mm) radial LED operates at 2.2V forward voltage with a 300mcd brightness rating and 568nm dominant wavelength. The component is ROHS3 compliant and maintains active product status with 1575 units currently in stock.

Substitute parts are necessary when the primary part becomes unavailable, when design requirements demand alternative electrical characteristics, or when supply chain optimization requires component standardization across manufacturing facilities.

Key Parameters

Parameter	Value	Specification Basis
Lens Size	5mm, T-1 3/4	Physical form factor and mounting compatibility
Mounting Type	Through Hole Radial	PCB assembly method
Color	Green	Visual indication requirement
Lens Transparency	Clear	Optical clarity specification
Voltage - Forward (Vf)	2.2V Typical	Circuit design and current limiting resistor calculation
Current - Test	20mA	Standard operating condition
Millicandela Rating	300mcd	Brightness and visibility requirement
Viewing Angle	30°	Directional visibility specification
Wavelength - Dominant	568nm	Color perception and application requirement
RoHS Status	ROHS3 Compliant	Environmental and regulatory compliance
Moisture Sensitivity Level	1 (Unlimited)	Storage and handling requirements

Substitute Part Grouping Explanation

Substitution logic for the WP7143SGC is based on the following criteria applied in order of priority:

Primary Compatibility Criteria:

Mounting type must be through-hole radial
Lens size must be 5mm or T-1 3/4 form factor
Color must be green
Lens transparency must be clear
RoHS3 compliance required

Secondary Compatibility Criteria:

Forward voltage (Vf) tolerance: ±0.5V from 2.2V nominal
Millicandela rating: minimum 240mcd for direct substitution
Viewing angle: 20° to 30° acceptable range
Wavelength dominant: 525nm to 568nm acceptable range

Tertiary Considerations:

Product status (active preferred, not for new designs acceptable for legacy support)
Package format (bulk or cut tape)
Height variation within ±1.0mm

Parts are grouped into three categories:

Direct Substitutes (Kingbright Series): WP7113SGC meets all primary and secondary criteria with minimal parameter variance.

Compatible Alternatives (Broadcom, Lite-On, TT Electronics): HLMP-CM3A-Z10DD, HLMP-CM3B-Z10DD, LTL2T3TGK6, OVLFG3C7, and OVLLG8C7 meet primary criteria but operate at higher forward voltages (3.2V to 3.5V) and higher brightness ratings (2400mcd to 16500mcd).

Limited Compatibility (Dialight, Rohm): 5219465F and SLA-570MT3F meet primary criteria with acceptable forward voltage (2.3V) but have reduced brightness ratings (120mcd to 470mcd) or wavelength variations.

Parameter Comparison

Part Number	Manufacturer	Vf (Typ)	mcd Rating	Viewing Angle	Wavelength - Dominant	Height (Max)	Product Status	Inventory
WP7143SGC	Kingbright	2.2V	300mcd	30°	568nm	8.60mm	Active	1575 Pcs
WP7113SGC	Kingbright	2.2V	240mcd	20°	568nm	8.60mm	Active	172516 Pcs
5219465F	Dialight	2.3V	120mcd	24°	Not Specified	8.81mm	Active	2623 Pcs
5219947F	Dialight	3.8V	4200mcd	30°	527nm	9.65mm	Active	1050 Pcs
HLMP-CM1G-350DD	Broadcom Limited	3.1V	43000mcd	15°	525nm	8.90mm	Active	13534 Pcs
HLMP-CM3A-Z10DD	Broadcom Limited	3.2V	16500mcd	30°	525nm	8.90mm	Active	2100 Pcs
HLMP-CM3B-Z10DD	Broadcom Limited	3.2V	16500mcd	30°	525nm	12.25mm	Active	19428 Pcs
LTL2T3TGK6	Lite-On Inc.	3.5V	4500mcd	30°	525nm	8.70mm	Active	18518 Pcs
OVLFG3C7	TT Electronics/Optek Technology	3.4V	16000mcd	30°	525nm	8.70mm	Active	19507 Pcs
OVLLG8C7	TT Electronics/Optek Technology	3.2V	2400mcd	85°	525nm	6.80mm	Active	37927 Pcs
SLA-570MT3F	Rohm Semiconductor	2.3V	470mcd	25°	Not Specified	8.85mm	Not For New Designs	69100 Pcs

Engineering Selection Recommendations

For Direct Replacement (Identical Electrical Characteristics):

WP7113SGC is the primary substitute when WP7143SGC is unavailable. Both components share identical forward voltage (2.2V), wavelength (568nm), and mounting specifications. The WP7113SGC operates at 240mcd versus 300mcd, representing an 80% brightness retention. The viewing angle is narrower at 20° versus 30°. This part is suitable for applications where brightness reduction is acceptable and directional viewing is not critical. Inventory availability is significantly higher (172516 units).

For Higher Brightness Applications:

HLMP-CM3A-Z10DD, HLMP-CM3B-Z10DD, OVLFG3C7, and LTL2T3TGK6 provide brightness ratings between 4500mcd and 16500mcd. These parts require circuit redesign due to forward voltage increase from 2.2V to 3.2V–3.5V. Current-limiting resistor values must be recalculated. These substitutes are suitable when increased visibility is required and circuit modification is feasible.

For Wide-Angle Applications:

OVLLG8C7 provides an 85° viewing angle compared to the original 30°. This part operates at 3.2V forward voltage with 2400mcd brightness. The flat-top lens design differs from the domed-top original. This substitute is appropriate for applications requiring omnidirectional visibility.

For Legacy System Support:

SLA-570MT3F maintains 2.3V forward voltage compatibility with minimal circuit modification. However, this part carries "Not For New Designs" status and should be used only for maintaining existing systems. Brightness is 470mcd, providing 157% of the original specification.

Compliance Verification:

All recommended substitutes maintain ROHS3 compliance and MSL 1 (Unlimited) moisture sensitivity rating. REACH status is unaffected for all parts. ECCN classification remains EAR99 across all alternatives.

Frequently Asked Questions (FAQ)

Q: Can WP7113SGC replace WP7143SGC in all applications?

A: WP7113SGC is electrically compatible as a direct substitute. Both operate at 2.2V forward voltage with identical wavelength (568nm) and through-hole radial mounting. The primary difference is brightness: WP7113SGC provides 240mcd versus 300mcd. Substitution is valid when the application does not require the full 300mcd brightness specification. The narrower 20° viewing angle (versus 30°) may affect visibility in wide-angle applications.

Q: What circuit modifications are required when using HLMP-CM3A-Z10DD instead of WP7143SGC?

A: HLMP-CM3A-Z10DD operates at 3.2V forward voltage compared to WP7143SGC at 2.2V. This 1.0V increase requires recalculation of the current-limiting resistor. Using Ohm's law: R = (Vsupply - Vf) / Iled. For a 5V supply with 20mA target current, the original resistor value (approximately 140Ω) must be adjusted to approximately 90Ω. Verify the resistor power rating remains adequate. No other circuit modifications are necessary.

Q: Are there viewing angle restrictions when substituting parts?

A: Viewing angle affects the cone of light emission. WP7143SGC specifies 30°, meaning light intensity is maintained within a 30° cone from the LED axis. Substitutes with narrower angles (such as HLMP-CM1G-350DD at 15°) concentrate light in a tighter beam, reducing visibility from off-axis positions. Substitutes with wider angles (such as OVLLG8C7 at 85°) distribute light more broadly. Select based on the application's viewing geometry requirements.

Q: Can OVLLG8C7 be used as a direct replacement despite its flat-top lens?

A: OVLLG8C7 has a flat-top lens versus the domed-top design of WP7143SGC. This affects light distribution and appearance. Electrically, OVLLG8C7 is compatible at 3.2V forward voltage. Mechanically, the flat-top lens may not fit identical lens covers or diffusers designed for domed-top LEDs. Verify mechanical compatibility before substitution. The 85° viewing angle provides significantly wider light distribution.

Q: Why is SLA-570MT3F marked "Not For New Designs"?

A: SLA-570MT3F carries this designation from Rohm Semiconductor, indicating the manufacturer is discontinuing this product line. While the part remains available in inventory (69100 units), it should not be specified in new product designs. Use this part only for maintaining or repairing existing systems. For new designs, select from parts with "Active" product status.

Q: What is the impact of wavelength differences between 568nm and 525nm?

A: WP7143SGC has a dominant wavelength of 568nm (yellow-green), while many substitutes operate at 525nm (pure green). This difference affects color perception. The 568nm part appears slightly more yellow-green, while 525nm appears as true green. In applications where color matching is critical (such as indicator panels with color-coded functions), wavelength differences may be visually noticeable. For general green indication purposes, both wavelengths are acceptable.

Q: Is inventory availability a factor in substitute selection?

A: Inventory levels indicate supply reliability. WP7143SGC has 1575 units available. WP7113SGC has significantly higher availability at 172516 units, making it a more reliable long-term supply option. OVLLG8C7 (37927 units) and HLMP-CM3B-Z10DD (19428 units) also provide strong inventory positions. When supply continuity is critical, prioritize substitutes with higher inventory levels.

Q: Can multiple substitute parts be used interchangeably on the same PCB?

A: No. Each substitute has different electrical characteristics (forward voltage, brightness, viewing angle). Using different parts on the same board would require different current-limiting resistor values for each LED position, complicating assembly and increasing component count. Standardize on a single substitute part number across the entire design.

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